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  • Why does String.Equals(Object obj) check to see if this == null?

    - by m-y
    // Determines whether two strings match. [ReliabilityContract(Consistency.WillNotCorruptState, Cer.MayFail)] public override bool Equals(Object obj) { //this is necessary to guard against reverse-pinvokes and //other callers who do not use the callvirt instruction if (this == null) throw new NullReferenceException(); String str = obj as String; if (str == null) return false; if (Object.ReferenceEquals(this, obj)) return true; return EqualsHelper(this, str); } The part I don't understand is the fact that it is checking for the current instance, this, against null. The comment is a bit confusing, so I was wondering what does that comment actually mean? Can anyone give an example of how this could break if that check was not there, and does this mean that I should also place that check in my classes?

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  • Float a div on a textarea?

    - by Pradeep
    I have a div which has this list of suggestions. But i need to allocate it at the caret position of the textarea. Is this possible if yes, help me to do it. function findOffsetPosition(obj) { var posX = obj.clientLeft; var posY = obj.clientTop; while (obj.offsetParent) { if (obj == document.getElementsByTagName('body')[0]) { break } else { posX = posX + obj.offsetParent.offsetLeft; posY = posY + obj.offsetParent.offsetTop; obj = obj.offsetParent; } } var posArray = [posX, posY] return posArray; }

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  • JavaScript: this

    - by bdukes
    JavaScript is a language steeped in juxtaposition.  It was made to “look like Java,” yet is dynamic and classless.  From this origin, we get the new operator and the this keyword.  You are probably used to this referring to the current instance of a class, so what could it mean in a language without classes? In JavaScript, this refers to the object off of which a function is referenced when it is invoked (unless it is invoked via call or apply). What this means is that this is not bound to your function, and can change depending on how your function is invoked. It also means that this changes when declaring a function inside another function (i.e. each function has its own this), such as when writing a callback. Let's see some of this in action: var obj = { count: 0, increment: function () { this.count += 1; }, logAfterTimeout = function () { setTimeout(function () { console.log(this.count); }, 1); } }; obj.increment(); console.log(obj.count); // 1 var increment = obj.increment; window.count = 'global count value: '; increment(); console.log(obj.count); // 1 console.log(window.count); // global count value: 1 var newObj = {count:50}; increment.call(newObj); console.log(newObj.count); // 51 obj.logAfterTimeout();// global count value: 1 obj.logAfterTimeout = function () { var proxiedFunction = $.proxy(function () { console.log(this.count); }, this); setTimeout(proxiedFunction, 1); }; obj.logAfterTimeout(); // 1 obj.logAfterTimeout = function () { var that = this; setTimeout(function () { console.log(that.count); }, 1); }; obj.logAfterTimeout(); // 1 The last couple of examples here demonstrate some methods for making sure you get the values you expect.  The first time logAfterTimeout is redefined, we use jQuery.proxy to create a new function which has its this permanently set to the passed in value (in this case, the current this).  The second time logAfterTimeout is redefined, we save the value of this in a variable (named that in this case, also often named self) and use the new variable in place of this. Now, all of this is to clarify what’s going on when you use this.  However, it’s pretty easy to avoid using this altogether in your code (especially in the way I’ve demonstrated above).  Instead of using this.count all over the place, it would have been much easier if I’d made count a variable instead of a property, and then I wouldn’t have to use this to refer to it.  var obj = (function () { var count = 0; return { increment: function () { count += 1; }, logAfterTimeout = function () { setTimeout(function () { console.log(count); }, 1); }, getCount: function () { return count; } }; }()); If you’re writing your code in this way, the main place you’ll run into issues with this is when handling DOM events (where this is the element on which the event occurred).  In that case, just be careful when using a callback within that event handler, that you’re not expecting this to still refer to the element (and use proxy or that/self if you need to refer to it). Finally, as demonstrated in the example, you can use call or apply on a function to set its this value.  This isn’t often needed, but you may also want to know that you can use apply to pass in an array of arguments to a function (e.g. console.log.apply(console, [1, 2, 3, 4])).

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  • Qt Linking Error.

    - by Wallah
    Hi, I configure qt-x11 with following options ./configure -prefix /iTalk/qtx11 -prefix-install -bindir /iTalk/qtx11-install/bin -libdir /iTalk/qtx11-install/lib -docdir /iTalk/qtx11-install/doc -headerdir /iTalk/qtx11-install/include -datadir /iTalk/qtx11-install/data -examplesdir /iTalk/qtx11-install/examples -demosdir /iTalk/qtx11-install/demos -debug. Now I am getting following errors in Fedora Core 6. Can you please tell me where the problem is? obj/debug-shared/qapplication_x11.o: In function `qt_init(QApplicationPrivate*, int, _XDisplay*, unsigned long, unsigned long)': /iTalk/QT4/qt/src/gui/kernel/qapplication_x11.cpp:1713: undefined reference to `FcInit' .obj/debug-shared/qfontdatabase.o: In function `queryFont': /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1727: undefined reference to `FcFreeTypeQuery' .obj/debug-shared/qfontdatabase.o: In function `registerFont': /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1959: undefined reference to `FcConfigGetCurrent' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1963: undefined reference to `FcConfigGetFonts' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1965: undefined reference to `FcConfigAppFontAddFile' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1966: undefined reference to `FcConfigGetFonts' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1985: undefined reference to `FcConfigGetBlanks' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1997: undefined reference to `FcPatternDel' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1998: undefined reference to `FcPatternAddString' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:2001: undefined reference to `FcPatternGetString' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:2006: undefined reference to `FcFontSetAdd' .obj/debug-shared/qfontdatabase.o: In function `qt_FcPatternToQFontDef(_FcPattern*, QFontDef const&)': /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:746: undefined reference to `FcPatternGetString' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:751: undefined reference to `FcPatternGetDouble' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:759: undefined reference to `FcPatternGetDouble' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:771: undefined reference to `FcPatternGetInteger' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:776: undefined reference to `FcPatternGetInteger' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:786: undefined reference to `FcPatternGetBool' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:793: undefined reference to `FcPatternGetInteger' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:800: undefined reference to `FcPatternGetInteger' .obj/debug-shared/qfontdatabase.o: In function `FcFontSetRemove': /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1573: undefined reference to `FcPatternDestroy' .obj/debug-shared/qfontdatabase.o: In function `qt_fontSetForPattern(_FcPattern*, QFontDef const&)': /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1657: undefined reference to `FcFontSort' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1671: undefined reference to `FcPatternGetBool' .obj/debug-shared/qfontdatabase.o: In function `qt_addPatternProps(_FcPattern*, int, int, QFontDef const&)': /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1449: undefined reference to `FcPatternAddInteger' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1456: undefined reference to `FcPatternAddInteger' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1459: undefined reference to `FcPatternAddDouble' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1464: undefined reference to `FcPatternAddInteger' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1468: undefined reference to `FcPatternAddBool' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1471: undefined reference to `FcPatternAddBool' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1476: undefined reference to `FcLangSetCreate' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1477: undefined reference to `FcLangSetAdd' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1478: undefined reference to `FcPatternAddLangSet' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1479: undefined reference to `FcLangSetDestroy' .obj/debug-shared/qfontdatabase.o: In function `tryPatternLoad': /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1588: undefined reference to `FcPatternDuplicate' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1593: undefined reference to `FcConfigSubstitute' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1594: undefined reference to `FcDefaultSubstitute' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1596: undefined reference to `FcFontMatch' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1606: undefined reference to `FcPatternDuplicate' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1613: undefined reference to `FcPatternGetCharSet' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1615: undefined reference to `FcCharSetHasChar' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1619: undefined reference to `FcPatternGetLangSet' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1621: undefined reference to `FcLangSetHasLang' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1628: undefined reference to `FcPatternDel' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1629: undefined reference to `FcPatternAddBool' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1646: undefined reference to `FcPatternDestroy' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1648: undefined reference to `FcPatternDestroy' .obj/debug-shared/qfontdatabase.o: In function `loadFontConfig': /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1023: undefined reference to `FcObjectSetCreate' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1024: undefined reference to `FcPatternCreate' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1037: undefined reference to `FcObjectSetAdd' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1040: undefined reference to `FcFontList' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1041: undefined reference to `FcObjectSetDestroy' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1042: undefined reference to `FcPatternDestroy' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1046: undefined reference to `FcPatternGetString' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1057: undefined reference to `FcPatternGetInteger' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1059: undefined reference to `FcPatternGetInteger' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1061: undefined reference to `FcPatternGetInteger' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1063: undefined reference to `FcPatternGetString' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1065: undefined reference to `FcPatternGetInteger' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1067: undefined reference to `FcPatternGetBool' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1069: undefined reference to `FcPatternGetString' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1074: undefined reference to `FcPatternGetLangSet' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1081: undefined reference to `FcLangSetHasLang' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1100: undefined reference to `FcPatternGetCharSet' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1107: undefined reference to `FcCharSetHasChar' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1116: undefined reference to `FcPatternGetString' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1136: undefined reference to `FcPatternGetInteger' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1153: undefined reference to `FcPatternGetDouble' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1161: undefined reference to `FcFontSetDestroy' .obj/debug-shared/qfontdatabase.o: In function `getFcPattern': /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1494: undefined reference to `FcPatternCreate' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1509: undefined reference to `FcPatternAdd' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1516: undefined reference to `FcPatternAddWeak' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1524: undefined reference to `FcPatternAddWeak' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1531: undefined reference to `FcPatternAddInteger' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1533: undefined reference to `FcPatternAddBool' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1535: undefined reference to `FcPatternAddBool' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1539: undefined reference to `FcDefaultSubstitute' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1540: undefined reference to `FcConfigSubstitute' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1541: undefined reference to `FcConfigSubstitute' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1550: undefined reference to `FcPatternAddWeak' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1557: undefined reference to `FcPatternAddWeak' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1564: undefined reference to `FcPatternAddWeak' .obj/debug-shared/qfontdatabase.o: In function `loadFc': /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1707: undefined reference to `FcFontSetDestroy' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1716: undefined reference to `FcPatternDestroy' /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:1718: undefined reference to `FcPatternDestroy' .obj/debug-shared/qfontdatabase.o: In function `QFontDatabase::removeAllApplicationFonts()': /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:2048: undefined reference to `FcConfigAppFontClear' .obj/debug-shared/qfontdatabase.o: In function `QFontDatabase::removeApplicationFont(int)': /iTalk/QT4/qt/src/gui/text/qfontdatabase_x11.cpp:2027: undefined reference to `FcConfigAppFontClear' .obj/debug-shared/qfontengine_x11.o: In function `qt_x11ft_convert_pattern(_FcPattern*, QByteArray*, int*, bool*)': /iTalk/QT4/qt/src/gui/text/qfontengine_x11.cpp:970: undefined reference to `FcPatternGetString' /iTalk/QT4/qt/src/gui/text/qfontengine_x11.cpp:972: undefined reference to `FcPatternGetInteger' /iTalk/QT4/qt/src/gui/text/qfontengine_x11.cpp:975: undefined reference to `FcPatternGetBool' .obj/debug-shared/qfontengine_x11.o: In function `QFontEngineX11FT': /iTalk/QT4/qt/src/gui/text/qfontengine_x11.cpp:999: undefined reference to `FcPatternGetInteger' /iTalk/QT4/qt/src/gui/text/qfontengine_x11.cpp:1016: undefined reference to `FcPatternGetInteger' /iTalk/QT4/qt/src/gui/text/qfontengine_x11.cpp:1041: undefined reference to `FcPatternGetBool' /iTalk/QT4/qt/src/gui/text/qfontengine_x11.cpp:1077: undefined reference to `FcPatternGetBool' /iTalk/QT4/qt/src/gui/text/qfontengine_x11.cpp:1106: undefined reference to `FcPatternDestroy' /iTalk/QT4/qt/src/gui/text/qfontengine_x11.cpp:1112: undefined reference to `FcPatternGetCharSet' /iTalk/QT4/qt/src/gui/text/qfontengine_x11.cpp:1113: undefined reference to `FcCharSetCopy' /iTalk/QT4/qt/src/gui/text/qfontengine_x11.cpp:1115: undefined reference to `FcPatternDestroy' /iTalk/QT4/qt/src/gui/text/qfontengine_x11.cpp:999: undefined reference to `FcPatternGetInteger' /iTalk/QT4/qt/src/gui/text/qfontengine_x11.cpp:1016: undefined reference to `FcPatternGetInteger' /iTalk/QT4/qt/src/gui/text/qfontengine_x11.cpp:1041: undefined reference to `FcPatternGetBool' /iTalk/QT4/qt/src/gui/text/qfontengine_x11.cpp:1077: undefined reference to `FcPatternGetBool' /iTalk/QT4/qt/src/gui/text/qfontengine_x11.cpp:1106: undefined reference to `FcPatternDestroy' /iTalk/QT4/qt/src/gui/text/qfontengine_x11.cpp:1112: undefined reference to `FcPatternGetCharSet' /iTalk/QT4/qt/src/gui/text/qfontengine_x11.cpp:1113: undefined reference to `FcCharSetCopy' /iTalk/QT4/qt/src/gui/text/qfontengine_x11.cpp:1115: undefined reference to `FcPatternDestroy' .obj/debug-shared/qfontengine_x11.o: In function `engineForPattern': /iTalk/QT4/qt/src/gui/text/qfontengine_x11.cpp:868: undefined reference to `FcFontMatch' .obj/debug-shared/qfontengine_x11.o: In function `QFontEngineMultiFT::loadEngine(int)': /iTalk/QT4/qt/src/gui/text/qfontengine_x11.cpp:929: undefined reference to `FcPatternEqual' /iTalk/QT4/qt/src/gui/text/qfontengine_x11.cpp:932: undefined reference to `FcPatternDestroy' /iTalk/QT4/qt/src/gui/text/qfontengine_x11.cpp:941: undefined reference to `FcPatternDuplicate' /iTalk/QT4/qt/src/gui/text/qfontengine_x11.cpp:951: undefined reference to `FcConfigSubstitute' /iTalk/QT4/qt/src/gui/text/qfontengine_x11.cpp:952: undefined reference to `FcDefaultSubstitute' /iTalk/QT4/qt/src/gui/text/qfontengine_x11.cpp:956: undefined reference to `FcPatternDestroy' .obj/debug-shared/qfontengine_x11.o: In function `~QFontEngineMultiFT': /iTalk/QT4/qt/src/gui/text/qfontengine_x11.cpp:895: undefined reference to `FcPatternDestroy' /iTalk/QT4/qt/src/gui/text/qfontengine_x11.cpp:897: undefined reference to `FcPatternDestroy' /iTalk/QT4/qt/src/gui/text/qfontengine_x11.cpp:899: undefined reference to `FcFontSetDestroy' /iTalk/QT4/qt/src/gui/text/qfontengine_x11.cpp:895: undefined reference to `FcPatternDestroy' /iTalk/QT4/qt/src/gui/text/qfontengine_x11.cpp:897: undefined reference to `FcPatternDestroy' /iTalk/QT4/qt/src/gui/text/qfontengine_x11.cpp:899: undefined reference to `FcFontSetDestroy' /iTalk/QT4/qt/src/gui/text/qfontengine_x11.cpp:895: undefined reference to `FcPatternDestroy' /iTalk/QT4/qt/src/gui/text/qfontengine_x11.cpp:897: undefined reference to `FcPatternDestroy' /iTalk/QT4/qt/src/gui/text/qfontengine_x11.cpp:899: undefined reference to `FcFontSetDestroy' .obj/debug-shared/qfontengine_ft.o: In function `QFontEngineFT::stringToCMap(QChar const*, int, QGlyphLayout*, int*, QFlags) const': /iTalk/QT4/qt/src/gui/text/qfontengine_ft.cpp:1546: undefined reference to `FcCharSetHasChar' /iTalk/QT4/qt/src/gui/text/qfontengine_ft.cpp:1581: undefined reference to `FcCharSetHasChar' .obj/debug-shared/qfontengine_ft.o: In function `QFreetypeFace::release(QFontEngine::FaceId const&)': /iTalk/QT4/qt/src/gui/text/qfontengine_ft.cpp:308: undefined reference to `FcCharSetDestroy' collect2: ld returned 1 exit status make[1]: *** [../../lib/libQtGui.so.4.5.3] Error 1 make[1]: Leaving directory `/iTalk/QT4/qt/src/gui' make: *** [sub-gui-make_default-ordered] Error 2

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  • J2ME web service client

    - by Wasim
    Hi all , I started to use the Netbeans 6.8 web service client wizard . I created a web service (.Net web service) witch return an object Data. The Data class , contains fileds with many types : int , string , double , Person object and array of Person object. I created the J2ME client code through the wizard and every thing seems ok . I see in the Netbeans project the service and the stub . When I try to call my web service method , say Data GetData() ; Then I have a problem with parsing the returned data from the web service and the client data object . As follows : After finishing to call the web service method , in the stub code : public Data helloWorld() throws java.rmi.RemoteException { Object inputObject[] = new Object[] { }; Operation op = Operation.newInstance( _qname_operation_HelloWorld, _type_HelloWorld, _type_HelloWorldResponse ); _prepOperation( op ); op.setProperty( Operation.SOAPACTION_URI_PROPERTY, "http://tempuri.org/HelloWorld" ); Object resultObj; try { resultObj = op.invoke( inputObject ); } catch( JAXRPCException e ) { Throwable cause = e.getLinkedCause(); if( cause instanceof java.rmi.RemoteException ) { throw (java.rmi.RemoteException) cause; } throw e; } return Data_fromObject((Object[])resultObj); } private static Data Data_fromObject( Object obj[] ) { if(obj == null) return null; Data result = new Data(); result.setIntData(((Integer )obj[0]).intValue()); result.setStringData((String )obj[1]); result.setDoubleData(((Double )obj[2]).doubleValue()); return result; } I debug the code and in Run time resultObj has one element witc is an array of the Data object , so in parsing the values in the Data_fromObject method it expect many cells like we see in the code obj[0] , obj[1] , obj [2] but in realtime it has obj[0][0] , obj[0][1] , obj[0][2] What can be the problem , how can check the code generation issue ? Is it a problem with the web service side. Please help. Thanks in advance...

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  • Specification Pattern and Boolean Operator Precedence

    - by Anders Nielsen
    In our project, we have implemented the Specification Pattern with boolean operators (see DDD p 274), like so: public abstract class Rule { public Rule and(Rule rule) { return new AndRule(this, rule); } public Rule or(Rule rule) { return new OrRule(this, rule); } public Rule not() { return new NotRule(this); } public abstract boolean isSatisfied(T obj); } class AndRule extends Rule { private Rule one; private Rule two; AndRule(Rule one, Rule two) { this.one = one; this.two = two; } public boolean isSatisfied(T obj) { return one.isSatisfied(obj) && two.isSatisfied(obj); } } class OrRule extends Rule { private Rule one; private Rule two; OrRule(Rule one, Rule two) { this.one = one; this.two = two; } public boolean isSatisfied(T obj) { return one.isSatisfied(obj) || two.isSatisfied(obj); } } class NotRule extends Rule { private Rule rule; NotRule(Rule obj) { this.rule = obj; } public boolean isSatisfied(T obj) { return !rule.isSatisfied(obj); } } Which permits a nice expressiveness of the rules using method-chaining, but it doesn't support the standard operator precedence rules of which can lead to subtle errors. The following rules are not equivalent: Rule<Car> isNiceCar = isRed.and(isConvertible).or(isFerrari); Rule<Car> isNiceCar2 = isFerrari.or(isRed).and(isConvertible); The rule isNiceCar2 is not satisfied if the car is not a convertible, which can be confusing since if they were booleans isRed && isConvertible || isFerrari would be equivalent to isFerrari || isRed && isConvertible I realize that they would be equivalent if we rewrote isNiceCar2 to be isFerrari.or(isRed.and(isConvertible)), but both are syntactically correct. The best solution we can come up with, is to outlaw the method-chaining, and use constructors instead: OR(isFerrari, AND(isConvertible, isRed)) Does anyone have a better suggestion?

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  • Best method to select an object from another unknown jQuery object

    - by Yosi
    Lets say I have a jQuery object/collection stored in a variable named obj, which should contain a DOM element with an id named target. I don't know in advance if target will be a child in obj, i.e.: obj = $('<div id="parent"><div id="target"></div></div>'); or if obj equals target, i.e.: obj = $('<div id="target"></div>'); or if target is a top-level element inside obj, i.e.: obj = $('<div id="target"/><span id="other"/>'); I need a way to select target from obj, but I don't know in advance when to use .find and when to use .filter. What would be the fastest and/or most concise method of extracting target from obj? What I've come up with is: var $target = obj.find("#target").add(obj.filter("#target")); UPDATE I'm adding solutions to a JSPERF test page to see which one is the best. Currently my solution is still the fastest. Here is the link, please run the tests so that we'll have more data: http://jsperf.com/jquery-selecting-objects

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  • How to override part of an overload function in JavaScript

    - by Guan Yuxin
    I create a class with a function like this var Obj=function(){this.children=[];this.parent=null;}//a base class Obj.prototype.index=function(child){ // the index of current obj if(arguments.length==0){ return this.parent?this.parent.index(this):0; } // the index of a child matchs specific obj [to be override] return -1; } basically it is just an overload function composed of index() and index(child). Then I create a sub class,SubObj or whatever, inherits from Obj SubObj.prototype.prototype=Obj; Now, it's time to override the index(child) function,however, index() is also in the function an I don't want to overwrite it too. One solution is to write like this var Obj=function(){this.children=[];this.parent=null;}//a base class Obj.prototype.index=function(child){ // the index of current obj if(arguments.length==0){ return this.parent?this.parent.index(this):0; } // the index of a child matchs specific obj [to be override] return this._index(this); } Obj.prototype._index=function(this){ return -1; } SubObj.prototype._index=function(this){/* overwriteing */} But this will easily mislead other coders as _index(child) should be both private(should not be used except index() function) and public(is an overload function of index(),which is public) you guys have better idea?

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  • I'm writing a diagnostic app for iOS that loads a predetermined set of webpages and records the time it takes for the page to render on the device.

    - by user1754840
    I'm writing a sort of diagnostic app for iOS that opens a predetermined list of websites and records the elapsed time it takes each to load. I have the app open a UIWebView within a ViewController. Here are the important bits of the ViewController source: - (void)viewDidLoad { [super viewDidLoad]; DataClass *obj = [DataClass getInstance]; obj.startOfTest = [NSDate date]; //load the first webpage NSString *urlString = [websites objectAtIndex:obj.counter]; //assume firstWebsite is already instantiated and counter is initially set to zero obj.counter = obj.counter + 1; NSURL *url = [NSURL URLWithString:urlString]; NSURLRequest *request = [NSURLRequest requestWithURL:url]; [obj.websiteStartTimes addObject:[NSDate date]]; [webView loadRequest:request]; } - (void)webViewDidFinishLoading:(UIWebView *)localWebView{ DataClass *obj = [DataClass getInstance]; //gets 'global' variables if(!webView.loading){ NSString *urlString = [websites objectAt:obj.counter]; obj.counter = obj.counter + 1; NSURL *url = [NSURL URLWithString:urlString]; NSURLRequest *request = [NSURLRequest requestWithURL:url]; [obj.websiteStartTimes addObject:[NSDate date]]; [webView loadRequest:request]; } The problem with this code is that it seems to load the next website before the one before it has finished. I would have thought that both the call to webViewDidFinishLoading AND the if statement within that would ensure that the website would be done, but that's not the case. I've noticed that sometimes, a single website will invoke the didFinishLoading method more than once, but it would only enter the if statement once. For example, if I have a list of ten websites, the webView would only really show the 3rd and the 6th website on the list and then indicate that it was "done" rendering them all. What else can I do to ensure that a website is done loading completely and rendered to the screen before the app moves on to the next one?

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  • Javascript problem with a global external link confirmation alert

    - by OverDrive
    Below is the code from a plugin for Joomla. It works on it's own and it's purpose is to detect external links on the page and force them into new browser windows using _blank. I've tried for about an hour (I don't know javascript well) but I can't seem to figure out how to get an onclick function working. End result, I want to add to this script the ability of a confirmation dialog, shown in the 2nd code section. An external link, when clicked, will pop up the confirmation dialog, and if it says yes, they will be able to get to the external URL, opening in a new window. Otherwise, it cancels, and does nothing. When I create a link with onclick="return ExitNotice(this.href);" within it it works perfectly, but since my website has multiple people submitting input, I'd like the confirmation box global. this.blankwin = function(){ var hostname = window.location.hostname; hostname = hostname.replace("www.","").toLowerCase(); var a = document.getElementsByTagName("a"); this.check = function(obj){ var href = obj.href.toLowerCase(); return (href.indexOf("http://")!=-1 && href.indexOf(hostname)==-1) ? true : false; }; this.set = function(obj){ obj.target = "_blank"; obj.className = "blank"; }; for (var i=0;i<a.length;i++){ if(check(a[i])) set(a[i]); }; }; this.addEvent = function(obj,type,fn){ if(obj.attachEvent){ obj['e'+type+fn] = fn; obj[type+fn] = function(){obj['e'+type+fn](window.event );} obj.attachEvent('on'+type, obj[type+fn]); } else { obj.addEventListener(type,fn,false); }; }; addEvent(window,"load",blankwin); Second Part /* ---------- OnClick External Link Notice ---------- */ function ExitNotice(link,site,ltext) { if(confirm("-----------------------------------------------------------------------\n\n" + "You're leaving the HelpingTeens.org website. HelpingTeens.org\ndoes not " + "control this site and its privacy policies may differ\nfrom our own. " + "Thank you for using our site.\n\nYou will now access the following link:\n" + "\n" + link + "\n\nPress \'OK\' to proceed, or press \'Cancel\' to remain here." + "\n\n-----------------------------------------------------------------------")) { return true; } history.go(0); return false; } A) Can anyone help me fix this problem? or B) Is there a better solution?

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  • Should i use a C function or Obj-C Method?

    - by Daniel Granger
    I'm about to create a function which adds to NSDateComponents together is there any advantage to putting this in a C style function or should it go in a Obj-C method? Is there ever a reason to use one rather then the other or should I always stick to Obj-C? BTW: Not that it makes any difference I'm sure but this is for an app on the iPhone Many thanks

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  • Importing Models from Maya to OpenGL

    - by Mert Toka
    I am looking for ways to import models to my game project. I am using Maya as modelling software, and GLUT for windowing of my game. I found this great parser, it imports all the textures and normal vectors, but it is compatible with .obj files of 3dsMAX. I tried to use it with Maya obj's, and it turned out that Maya's obj files are a bit different from former one, thus it cannot parse them. If you know any way to convert Maya obj files to 3dsMax obj files, that would be acceptable as well as a new parser for Maya obj files.

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  • How to Inspect Javascript Object

    - by Madhan ayyasamy
    You can inspect any JavaScript objects and list them as indented, ordered by levels.It shows you type and property name. If an object property can't be accessed, an error message will be shown.Here the snippets for inspect javascript object.function inspect(obj, maxLevels, level){  var str = '', type, msg;    // Start Input Validations    // Don't touch, we start iterating at level zero    if(level == null)  level = 0;    // At least you want to show the first level    if(maxLevels == null) maxLevels = 1;    if(maxLevels < 1)             return '<font color="red">Error: Levels number must be > 0</font>';    // We start with a non null object    if(obj == null)    return '<font color="red">Error: Object <b>NULL</b></font>';    // End Input Validations    // Each Iteration must be indented    str += '<ul>';    // Start iterations for all objects in obj    for(property in obj)    {      try      {          // Show "property" and "type property"          type =  typeof(obj[property]);          str += '<li>(' + type + ') ' + property +                  ( (obj[property]==null)?(': <b>null</b>'):('')) + '</li>';          // We keep iterating if this property is an Object, non null          // and we are inside the required number of levels          if((type == 'object') && (obj[property] != null) && (level+1 < maxLevels))          str += inspect(obj[property], maxLevels, level+1);      }      catch(err)      {        // Is there some properties in obj we can't access? Print it red.        if(typeof(err) == 'string') msg = err;        else if(err.message)        msg = err.message;        else if(err.description)    msg = err.description;        else                        msg = 'Unknown';        str += '<li><font color="red">(Error) ' + property + ': ' + msg +'</font></li>';      }    }      // Close indent      str += '</ul>';    return str;}Method Call:function inspect(obj [, maxLevels [, level]]) Input Vars * obj: Object to inspect * maxLevels: Optional. Number of levels you will inspect inside the object. Default MaxLevels=1 * level: RESERVED for internal use of the functionReturn ValueHTML formatted string containing all values of inspected object obj.

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  • Assigning a colour to imorted obj. files that are being used as default material

    - by Salino
    I am having a problem with assigning a colour to the different meshes that I have on one object. The technique that I have used is the first approach on this site. Is it possible to export a simulation (animation) from Blender to Unity? So what I would like to do is the following. I have about 107 meshes that are different frames from my shape key animation of my blender model. What I would like to have is that the first mesh will be bright green and up to the 40th mesh the colour turns to be white /greyish... the best would be if I could assign every mesh by hand a colour, however they are all default materials. And if I assign the object a colour, the whole "animation" is going to be in that colour

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  • Main class passes dbConn obj to all its services, I need to change the dbConn for one of its services. - suggestion for design pattern

    - by tech_learner
    There is this main class and there are several services ( which uses db connection to retrieve data ) These services are initialized in the main class db properties are obtained from the property file and then dbconnection is opened by calling a method dbOpen() written in the main class and the resultant connection object is set to the service objects by iterating through the list of services and by calling setConnection method on the service note: that the services are instantiated in the main class and the main class is not a superclass for services. I also need to mention that there is this recycle db connection scenario only main class is aware of. /** connects to DB, optionally recycling existing connection), * throws RuntimeException if unable to connect */ private void connectDb(boolean recycle) { try { if (recycle) { log.status( log.getSB().append("Recycling DB Connection") ); closeDb(); } openDb(); for ( int i = 0 ; i < service.length ; i++ ) { service[i].setConnection(db); } } One of the service needs to use a different database, what is the best design pattern to use?

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  • Why can't I sort this container?

    - by Knowing me knowing you
    Please don't mind that there is no insert fnc and that data are hardcoded. The main purpouse of it is to correctly implement iterator for this container. //file Set.h #pragma once template<class T> class Set { template<class T> friend ostream& operator<<(ostream& out, const Set<T>& obj); private: T** myData_; std::size_t mySize_; std::size_t myIndex_; public: Set(); class iterator : public std::iterator<std::random_access_iterator_tag, T*> { private: T** itData_; public: iterator(T** obj) { itData_ = obj; } T operator*() const { return **itData_; } /*Comparing values of two iterators*/ bool operator<(const iterator& obj) { return **itData_ < **obj.itData_; } /*Substracting two iterators*/ difference_type operator-(const iterator& obj) { return itData_ - obj.itData_; } /*Moving iterator backward for value*/ iterator operator-(const int value) { return itData_ - value; } /*Adding two iterators*/ difference_type operator+(const iterator& obj) { return itData_ + obj.itData_; } /*Moving iterator forward for value*/ iterator operator+(const int value) { return itData_ + value; } bool operator!=(const iterator& obj) { return (itData_ != obj.itData_); } bool operator==(const iterator& obj) { return (itData_ == obj.itData_); } T** operator++() { return ++itData_; } T** operator--() { return --itData_; } }; iterator begin() const { return myData_; } iterator end() const { return myData_ + myIndex_; } }; template<class T> ostream& operator<<(ostream& out, const Set<T>& obj) { for (int i = 0;i < 3; ++i) { out << *obj.myData_[i] << "\n"; } return out; } //file Set_impl.h #pragma once #include "stdafx.h" #include "Set.h" template<class T> Set<T>::Set() { mySize_ = 3; myIndex_ = 3; myData_ = new T*[mySize_]; myData_[0] = new T(3); myData_[1] = new T(1); myData_[2] = new T(2); } //main include "stdafx.h" #include "Set_impl.h" int _tmain(int argc, _TCHAR* argv[]) { Set<int> a; Set<int>::iterator beg_ = a.begin(); Set<int>::iterator end_ = a.end(); std::sort(beg_,end_);//WONT SORT THIS RANGE cin.get(); return 0; } Why sort can't accept this iterators even though I've provided all operators needed for sort to work? I think the best way to check what's going on is to paste this code and run it first. Thanks

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  • Fading in/Fade out text in IE

    - by tau
    I had a problem and whipped up a quick solution: fade-in and fade-out a series of quotations. My solution works just as I want it in every browser except any of the IEs. The only problem with the IEs is that the text does not fade in and fade out; the text simply pops into existence. I believe I've run into a similar problem before when trying to dynamically change the filter:alpha(opacity=xx) of an element. Any help is greatly appreciated! <html> <head> <style> .fadetext{ background:green; border:1px solid red; height:50px; width:500px; } .fadetext div{ background:yellow; } </style> <script type="text/javascript"> var CI_common = { C:function(cls,elm){ if(!elm) elm = document; if(document.getElementsByClassName){ return elm.getElementsByClassName(cls); }else{ var t = []; var o = elm.getElementsByTagName("*"); var r = new RegExp("(^|\\s)" + cls + "($|\\s)"); for(var i=0;i<o.length;i++){ if(o[i].className.match(r)) t.push(o[i]); } return t; } }, eventAdd:function(obj,evt,func){ if(obj.addEventListener){ obj.addEventListener(evt,func,false); }else if(obj.attachEvent){ obj["x" + evt + func] = func; obj[evt + func] = function(){ obj["x" + evt + func](window.event); } obj.attachEvent("on" + evt,obj[evt + func]); } } } var CI_fadetext = { init:function(){ var c = CI_common.C("fadetext"); // Simply a getElementsByClassName function for(var i=0;i<c.length;i++){ c[i].style.overflow = "hidden"; var kids = c[i].getElementsByTagName("div"); for(var j=0;j<kids.length;j++){ kids[j].style.display = "none"; kids[j].style.filter = "alpha(opacity=0)"; kids[j].style.opacity = "0"; (function(obj,index,len){ obj.fadetexttimeout = setTimeout(function(){ CI_fadetext.fade(obj,true); obj.fadeininterval = setInterval(function(){ CI_fadetext.fade(obj,true); },5000*len) },5000*index); setTimeout(function(){ CI_fadetext.fade(obj,false); obj.fadeoutinterval = setInterval(function(){ CI_fadetext.fade(obj,false); },5000*len) },5000*index+4400); })(kids[j],j,kids.length); } } }, fade:function(elm,dir){ function fade(start){ start = (dir ? start + 10 : start - 10); elm.style.filter = "alpha(opacity=" + start + ")"; elm.style.opacity = start/100; document.getElementById("output").innerHTML = elm.style.filter; if(start > 100 || start <0){ elm.style.display = (dir ? "" : "none"); elm.style.filter = "alpha(opacity=" + (dir ? 100 : 0) + ")"; elm.style.opacity = (dir ? 1 : 0); }else elm.fadetexttimeout = setTimeout(function(){fade(start);},50); } if(dir){ elm.style.display = ""; fade(0); }else fade(100); } } CI_common.eventAdd(window,"load",CI_fadetext.init); // Just a window.onload level 2 event listener </script> </head> <body> <div id="output"></div> <div class="fadetext"> <div>AAAA</div> <div>BBBB</div> <div>CCCC</div> <div>DDDD</div> <div>EEEE</div> </div> </body> </html>

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  • Jquery Live Function

    - by marharépa
    Hi! I want to make this script to work as LIVE() function. Please help me! $(".img img").each(function() { $(this).cjObjectScaler({ destElem: $(this).parent(), method: "fit" }); }); the cjObjectScaler script (called in the html header) is this: (thanks for Doug Jones) (function ($) { jQuery.fn.imagesLoaded = function (callback) { var elems = this.filter('img'), len = elems.length; elems.bind('load', function () { if (--len <= 0) { callback.call(elems, this); } }).each(function () { // cached images don't fire load sometimes, so we reset src. if (this.complete || this.complete === undefined) { var src = this.src; // webkit hack from http://groups.google.com/group/jquery-dev/browse_thread/thread/eee6ab7b2da50e1f this.src = '#'; this.src = src; } }); }; })(jQuery); /* CJ Object Scaler */ (function ($) { jQuery.fn.cjObjectScaler = function (options) { /* user variables (settings) ***************************************/ var settings = { // must be a jQuery object method: "fill", // the parent object to scale our object into destElem: null, // fit|fill fade: 0 // if positive value, do hide/fadeIn }; /* system variables ***************************************/ var sys = { // function parameters version: '2.1.1', elem: null }; /* scale the image ***************************************/ function scaleObj(obj) { // declare some local variables var destW = jQuery(settings.destElem).width(), destH = jQuery(settings.destElem).height(), ratioX, ratioY, scale, newWidth, newHeight, borderW = parseInt(jQuery(obj).css("borderLeftWidth"), 10) + parseInt(jQuery(obj).css("borderRightWidth"), 10), borderH = parseInt(jQuery(obj).css("borderTopWidth"), 10) + parseInt(jQuery(obj).css("borderBottomWidth"), 10), objW = jQuery(obj).width(), objH = jQuery(obj).height(); // check for valid border values. IE takes in account border size when calculating width/height so just set to 0 borderW = isNaN(borderW) ? 0 : borderW; borderH = isNaN(borderH) ? 0 : borderH; // calculate scale ratios ratioX = destW / jQuery(obj).width(); ratioY = destH / jQuery(obj).height(); // Determine which algorithm to use if (!jQuery(obj).hasClass("cf_image_scaler_fill") && (jQuery(obj).hasClass("cf_image_scaler_fit") || settings.method === "fit")) { scale = ratioX < ratioY ? ratioX : ratioY; } else if (!jQuery(obj).hasClass("cf_image_scaler_fit") && (jQuery(obj).hasClass("cf_image_scaler_fill") || settings.method === "fill")) { scale = ratioX < ratioY ? ratioX : ratioY; } // calculate our new image dimensions newWidth = parseInt(jQuery(obj).width() * scale, 10) - borderW; newHeight = parseInt(jQuery(obj).height() * scale, 10) - borderH; // Set new dimensions & offset jQuery(obj).css({ "width": newWidth + "px", "height": newHeight + "px"//, // "position": "absolute", // "top": (parseInt((destH - newHeight) / 2, 10) - parseInt(borderH / 2, 10)) + "px", // "left": (parseInt((destW - newWidth) / 2, 10) - parseInt(borderW / 2, 10)) + "px" }).attr({ "width": newWidth, "height": newHeight }); // do our fancy fade in, if user supplied a fade amount if (settings.fade > 0) { jQuery(obj).fadeIn(settings.fade); } } /* set up any user passed variables ***************************************/ if (options) { jQuery.extend(settings, options); } /* main ***************************************/ return this.each(function () { sys.elem = this; // if they don't provide a destObject, use parent if (settings.destElem === null) { settings.destElem = jQuery(sys.elem).parent(); } // need to make sure the user set the parent's position. Things go bonker's if not set. // valid values: absolute|relative|fixed if (jQuery(settings.destElem).css("position") === "static") { jQuery(settings.destElem).css({ "position": "relative" }); } // if our object to scale is an image, we need to make sure it's loaded before we continue. if (typeof sys.elem === "object" && typeof settings.destElem === "object" && typeof settings.method === "string") { // if the user supplied a fade amount, hide our image if (settings.fade > 0) { jQuery(sys.elem).hide(); } if (sys.elem.nodeName === "IMG") { // to fix the weird width/height caching issue we set the image dimensions to be auto; jQuery(sys.elem).width("auto"); jQuery(sys.elem).height("auto"); // wait until the image is loaded before scaling jQuery(sys.elem).imagesLoaded(function () { scaleObj(this); }); } else { scaleObj(jQuery(sys.elem)); } } else { console.debug("CJ Object Scaler could not initialize."); return; } }); }; })(jQuery);

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  • Trying to randomise a jQuery content slider

    - by alecrust
    Hi everyone, I'm using a very nice jQuery content slider called Easy Slider on my site that I downloaded from Css Globe. The script is excellent and does just what I want - except I can't make it randomise the list, it always scrolls from left to right or right to left! I'm far from good with JavaScript, so my attempts at solving this have been feeble. Although I'm sure it must be an easy fix! If anyone wouldn't mind taking a glance over the script to see if they can spot what I need to change to make it random it would be greatly appreciated! I've tried contacting the original plugin developer but have had no response yet. The comments on the Easy Slider page didn't bear much fruit either unfortunately. I've pasted the script I'm using on my site below: /* * Easy Slider 1.7 - jQuery plugin * written by Alen Grakalic * http://cssglobe.com/post/4004/easy-slider-15-the-easiest-jquery-plugin-for-sliding * * Copyright (c) 2009 Alen Grakalic (http://cssglobe.com) * Dual licensed under the MIT (MIT-LICENSE.txt) * and GPL (GPL-LICENSE.txt) licenses. * * Built for jQuery library * http://jquery.com * */ (function($) { $.fn.easySlider = function(options){ // default configuration properties var defaults = { prevId: 'prevBtn', prevText: 'Previous', nextId: 'nextBtn', nextText: 'Next', controlsShow: true, controlsBefore: '', controlsAfter: '', controlsFade: true, firstId: 'firstBtn', firstText: 'First', firstShow: false, lastId: 'lastBtn', lastText: 'Last', lastShow: false, vertical: false, speed: 800, auto: false, pause: 7000, continuous: false, numeric: false, numericId: 'controls' }; var options = $.extend(defaults, options); this.each(function() { var obj = $(this); var s = $("li", obj).length; var w = $("li", obj).width(); var h = $("li", obj).height(); var clickable = true; obj.width(w); obj.height(h); obj.css("overflow","hidden"); var ts = s-1; var t = 0; $("ul", obj).css('width',s*w); if(options.continuous){ $("ul", obj).prepend($("ul li:last-child", obj).clone().css("margin-left","-"+ w +"px")); $("ul", obj).append($("ul li:nth-child(2)", obj).clone()); $("ul", obj).css('width',(s+1)*w); }; if(!options.vertical) $("li", obj).css('float','left'); if(options.controlsShow){ var html = options.controlsBefore; if(options.numeric){ html += '<ol id="'+ options.numericId +'"></ol>'; } else { if(options.firstShow) html += '<span id="'+ options.firstId +'"><a href=\"javascript:void(0);\">'+ options.firstText +'</a></span>'; html += ' <span id="'+ options.prevId +'"><a href=\"javascript:void(0);\">'+ options.prevText +'</a></span>'; html += ' <span id="'+ options.nextId +'"><a href=\"javascript:void(0);\">'+ options.nextText +'</a></span>'; if(options.lastShow) html += ' <span id="'+ options.lastId +'"><a href=\"javascript:void(0);\">'+ options.lastText +'</a></span>'; }; html += options.controlsAfter; $(obj).after(html); }; if(options.numeric){ for(var i=0;i<s;i++){ $(document.createElement("li")) .attr('id',options.numericId + (i+1)) .html('<a rel='+ i +' href=\"javascript:void(0);\">'+ (i+1) +'</a>') .appendTo($("#"+ options.numericId)) .click(function(){ animate($("a",$(this)).attr('rel'),true); }); }; } else { $("a","#"+options.nextId).click(function(){ animate("next",true); }); $("a","#"+options.prevId).click(function(){ animate("prev",true); }); $("a","#"+options.firstId).click(function(){ animate("first",true); }); $("a","#"+options.lastId).click(function(){ animate("last",true); }); }; function setCurrent(i){ i = parseInt(i)+1; $("li", "#" + options.numericId).removeClass("current"); $("li#" + options.numericId + i).addClass("current"); }; function adjust(){ if(t>ts) t=0; if(t<0) t=ts; if(!options.vertical) { $("ul",obj).css("margin-left",(t*w*-1)); } else { $("ul",obj).css("margin-left",(t*h*-1)); } clickable = true; if(options.numeric) setCurrent(t); }; function animate(dir,clicked){ if (clickable){ clickable = false; var ot = t; switch(dir){ case "next": t = (ot>=ts) ? (options.continuous ? t+1 : ts) : t+1; break; case "prev": t = (t<=0) ? (options.continuous ? t-1 : 0) : t-1; break; case "first": t = 0; break; case "last": t = ts; break; default: t = dir; break; }; var diff = Math.abs(ot-t); var speed = diff*options.speed; if(!options.vertical) { p = (t*w*-1); $("ul",obj).animate( { marginLeft: p }, { queue:false, duration:speed, complete:adjust } ); } else { p = (t*h*-1); $("ul",obj).animate( { marginTop: p }, { queue:false, duration:speed, complete:adjust } ); }; if(!options.continuous && options.controlsFade){ if(t==ts){ $("a","#"+options.nextId).hide(); $("a","#"+options.lastId).hide(); } else { $("a","#"+options.nextId).show(); $("a","#"+options.lastId).show(); }; if(t==0){ $("a","#"+options.prevId).hide(); $("a","#"+options.firstId).hide(); } else { $("a","#"+options.prevId).show(); $("a","#"+options.firstId).show(); }; }; if(clicked) clearTimeout(timeout); if(options.auto && dir=="next" && !clicked){; timeout = setTimeout(function(){ animate("next",false); },diff*options.speed+options.pause); }; }; }; // init var timeout; if(options.auto){; timeout = setTimeout(function(){ animate("next",false); },options.pause); }; if(options.numeric) setCurrent(0); if(!options.continuous && options.controlsFade){ $("a","#"+options.prevId).hide(); $("a","#"+options.firstId).hide(); }; }); }; })(jQuery); Many thanks again! Alec

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  • Avoiding new operator in JavaScript -- the better way

    - by greengit
    Warning: This is a long post. Let's keep it simple. I want to avoid having to prefix the new operator every time I call a constructor in JavaScript. This is because I tend to forget it, and my code screws up badly. The simple way around this is this... function Make(x) { if ( !(this instanceof arguments.callee) ) return new arguments.callee(x); // do your stuff... } But, I need this to accept variable no. of arguments, like this... m1 = Make(); m2 = Make(1,2,3); m3 = Make('apple', 'banana'); The first immediate solution seems to be the 'apply' method like this... function Make() { if ( !(this instanceof arguments.callee) ) return new arguments.callee.apply(null, arguments); // do your stuff } This is WRONG however -- the new object is passed to the apply method and NOT to our constructor arguments.callee. Now, I've come up with three solutions. My simple question is: which one seems best. Or, if you have a better method, tell it. First – use eval() to dynamically create JavaScript code that calls the constructor. function Make(/* ... */) { if ( !(this instanceof arguments.callee) ) { // collect all the arguments var arr = []; for ( var i = 0; arguments[i]; i++ ) arr.push( 'arguments[' + i + ']' ); // create code var code = 'new arguments.callee(' + arr.join(',') + ');'; // call it return eval( code ); } // do your stuff with variable arguments... } Second – Every object has __proto__ property which is a 'secret' link to its prototype object. Fortunately this property is writable. function Make(/* ... */) { var obj = {}; // do your stuff on 'obj' just like you'd do on 'this' // use the variable arguments here // now do the __proto__ magic // by 'mutating' obj to make it a different object obj.__proto__ = arguments.callee.prototype; // must return obj return obj; } Third – This is something similar to second solution. function Make(/* ... */) { // we'll set '_construct' outside var obj = new arguments.callee._construct(); // now do your stuff on 'obj' just like you'd do on 'this' // use the variable arguments here // you have to return obj return obj; } // now first set the _construct property to an empty function Make._construct = function() {}; // and then mutate the prototype of _construct Make._construct.prototype = Make.prototype; eval solution seems clumsy and comes with all the problems of "evil eval". __proto__ solution is non-standard and the "Great Browser of mIsERY" doesn't honor it. The third solution seems overly complicated. But with all the above three solutions, we can do something like this, that we can't otherwise... m1 = Make(); m2 = Make(1,2,3); m3 = Make('apple', 'banana'); m1 instanceof Make; // true m2 instanceof Make; // true m3 instanceof Make; // true Make.prototype.fire = function() { // ... }; m1.fire(); m2.fire(); m3.fire(); So effectively the above solutions give us "true" constructors that accept variable no. of arguments and don't require new. What's your take on this. -- UPDATE -- Some have said "just throw an error". My response is: we are doing a heavy app with 10+ constructors and I think it'd be far more wieldy if every constructor could "smartly" handle that mistake without throwing error messages on the console.

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  • nmake makefile, linking objects files in a subfolder

    - by Gauthier
    My makefile defines a link command: prod_link = $(LINK) $(LINK_FLAGS) -o$(PROD_OUT) $(PROD_OBJS) where $(PROD_OBJS) is a list of object files of the form: PROD_OBJS = objfile1.obj objfile2.obj objfile3.obj ... objfileN.obj Now the makefile itself is at the root of my project directory. It gets messy to have object and listing files at the root, I'd like to put them in a subfolder. Building and outputing the obj files to a subfolder works, I'm doing it with suffixes and inference: .s.obj: $(ASSEMBLY) $(FLAGS) $*.s -o Objects\$*.obj The problem is to pass the Objects folder to the link command. I tried: prod_link = $(LINK) $(LINK_FLAGS) -o$(PROD_OUT) Objects\$(PROD_OBJS) but only the first file in the list of object files gets the folder's name. How can I pass the Objects subfolder to all files of my list $(PROD_OBJS)? EDIT I tried also PROD_OBJS = $(patsubst %.ss,Object\%.obj, $(PROD_SRC)) but got: makefile(51) : fatal error U1000: syntax error : ')' missing in macro invocation Stop. This is quite strange...

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  • How to sort an NSMutableArray List of objects in alphabetical order.

    - by Madan Mohan
    Hi guys, I have an object with different values that is name,nameid, lifebeging,lifeEndiging .... etc, for loop { Search *Obj=[artistslist objectAtIndex:i];// here i will get name, ids, other value for each objcet } 0 obj.name= //string values1 get from parser 1 obj.name= //string values1 2 obj.name= //string values1 3 obj.name= //string values1 4 obj.name= //string values1 I am getting values in the artistList then i need to sort only by name not other feilds when i use this below statement [artistsList sortUsingSelector:@selector(NSOrderedAscending:)]; i am getting exception here ,it is not working.

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  • How to read verbose VC++ linker output

    - by Assaf Lavie
    Trying to debug some linker errors, I turned on /VERBOSE and I'm trying to make sense of the output. It occurs to me that I really don't know how to read it. For example: 1>Compiling version info 1>Linking... 1>Starting pass 1 1>Processed /DEFAULTLIB:mfc80.lib 1>Processed /DEFAULTLIB:mfcs80.lib 1>Processed /DEFAULTLIB:msvcrt.lib 1>Processed /DEFAULTLIB:kernel32.lib 1>Processed /DEFAULTLIB:user32.lib .... 1>Processed /DEFAULTLIB:libgslcblasMD.lib 1>Searching libraries 1> Searching V:\Src\Solutions\\..\..\\Common\Win32\Lib\PlxApi.lib: 1> Searching ..\..\..\..\out\win32\release\lib\camerageometry.lib: 1> Searching ..\..\..\..\out\win32\release\lib\geometry.lib: 1> Found "public: __thiscall VisionMap::Geometry::Box2d::operator class VisionMap::Geometry::Box2DInt(void)const " (??BBox2d@Geometry@VisionMap@@QBE?AVBox2DInt@12@XZ) 1> Referenced in FocusDlg.obj 1> Loaded geometry.lib(Box2d.obj) 1>Processed /DEFAULTLIB:CGAL-vc80-mt.lib 1>Processed /DEFAULTLIB:boost_thread-vc80-mt-1_33_1.lib What's going on here? I think I understand this bit: 1>Processed /DEFAULTLIB:libgslcblasMD.lib 1>Searching libraries 1> Searching V:\Src\Solutions\\..\..\\Common\Win32\Lib\PlxApi.lib: 1> Searching ..\..\..\..\out\win32\release\lib\camerageometry.lib: 1> Searching ..\..\..\..\out\win32\release\lib\geometry.lib: 1> Found "public: __thiscall VisionMap::Geometry::Box2d::operator class VisionMap::Geometry::Box2DInt(void)const " (??BBox2d@Geometry@VisionMap@@QBE?AVBox2DInt@12@XZ) 1> Referenced in FocusDlg.obj 1> Loaded geometry.lib(Box2d.obj) It's trying to find the implementation of the above operator, which is used somewhere in FocusDlg.cpp, and it finds it in geometry.lib. But what does 1>Processed /DEFAULTLIB:libgslcblasMD.lib mean? What determines the order of symbol resolution? Why is it loading this particular symbol while processing libgslcblasMD.lib which is a 3rd party library? Or am I reading it wrong? It seems that the linker is going through the symbols referenced in the project's various object files, but I have no idea in what order. It then searches the static libraries the project uses - by project reference, explicit import and automatic default library imports; but it does so in an order that, again, seems arbitrary to me. When it finds a symbol, for example in geometry.lib, it then continues to find a bunch of other symbols from the same lib: 1> Searching V:\Src\Solutions\\..\..\\Common\Win32\Lib\PlxApi.lib: 1> Searching ..\..\..\..\out\win32\release\lib\camerageometry.lib: 1> Searching ..\..\..\..\out\win32\release\lib\geometry.lib: 1> Found "public: __thiscall VisionMap::Geometry::Box2d::operator class VisionMap::Geometry::Box2DInt(void)const " (??BBox2d@Geometry@VisionMap@@QBE?AVBox2DInt@12@XZ) 1> Referenced in FocusDlg.obj 1> Loaded geometry.lib(Box2d.obj) 1>Processed /DEFAULTLIB:CGAL-vc80-mt.lib 1>Processed /DEFAULTLIB:boost_thread-vc80-mt-1_33_1.lib 1> Found "public: __thiscall VisionMap::Geometry::Box2DInt::Box2DInt(int,int,int,int)" (??0Box2DInt@Geometry@VisionMap@@QAE@HHHH@Z) 1> Referenced in FocusDlg.obj 1> Referenced in ImageView.obj 1> Referenced in geometry.lib(Box2d.obj) 1> Loaded geometry.lib(Box2DInt.obj) 1> Found "public: virtual __thiscall VisionMap::Geometry::Point3d::~Point3d(void)" (??1Point3d@Geometry@VisionMap@@UAE@XZ) 1> Referenced in GPSFrm.obj 1> Referenced in MainFrm.obj 1> Loaded geometry.lib(Point3d.obj) 1> Found "void __cdecl VisionMap::Geometry::serialize<class boost::archive::binary_oarchive>(class boost::archive::binary_oarchive &,class VisionMap::Geometry::Point3d &,unsigned int)" (??$serialize@Vbinary_oarchive@archive@boost@@@Geometry@VisionMap@@YAXAAVbinary_oarchive@archive@boost@@AAVPoint3d@01@I@Z) 1> Referenced in GPSFrm.obj 1> Referenced in MainFrm.obj 1> Loaded geometry.lib(GeometrySerializationImpl.obj) But then, for some reason, it goes on to find symbols that are defined in other libs, and returns to geometry later on (a bunch of times). So clearly it's not doing "look in geometry and load every symbol that's references in the project, and then continue to other libraries". But it's not clear to me what is the order of symbol lookup. And what's the deal with all those libraries being processed at the beginning of the linker's work, but not finding any symbols to load from them? Does this project really not use anything from msvcrt.lib, kernel32.lib? Seems unlikely. So basically I'm looking to decipher the underlying order in the linker's operation.

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  • EJB3 Transaction Propogation

    - by Matt S.
    I have a stateless bean something like: @Stateless public class MyStatelessBean implements MyStatelessLocal, MyStatelessRemote { @PersistenceContext(unitName="myPC") private EntityManager mgr; @TransationAttribute(TransactionAttributeType.SUPPORTED) public void processObjects(List<Object> objs) { // this method just processes the data; no need for a transaction for(Object obj : objs) { this.process(obj); } } @TransationAttribute(TransactionAttributeType.REQUIRES_NEW) public void process(Object obj) { // do some work with obj that must be in the scope of a transaction this.mgr.merge(obj); // ... this.mgr.merge(obj); // ... this.mgr.flush(); } } The typically usage then is the client would call processObjects(...), which doesn't actually interact with the entity manager. It does what it needs to do and calls process(...) individually for each object to process. The duration of process(...) is relatively short, but processObjects(...) could take a very long time to run through everything. Therefore I don't want it to maintain an open transaction. I do need the individual process(...) operations to operate within their own transaction. This should be a new transaction for every call. Lastly I'd like to keep the option open for the client to call process(...) directly. I've tried a number of different transaction types: never, not supported, supported (on processObjects) and required, requires new (on process) but I get TransactionRequiredException every time merge() is called. I've been able to make it work by splitting up the methods into two different beans: @Stateless @TransationAttribute(TransactionAttributeType.NOT_SUPPORTED) public class MyStatelessBean1 implements MyStatelessLocal1, MyStatelessRemote1 { @EJB private MyStatelessBean2 myBean2; public void processObjects(List<Object> objs) { // this method just processes the data; no need for a transaction for(Object obj : objs) { this.myBean2.process(obj); } } } @Stateless public class MyStatelessBean2 implements MyStatelessLocal2, MyStatelessRemote2 { @PersistenceContext(unitName="myPC") private EntityManager mgr; @TransationAttribute(TransactionAttributeType.REQUIRES_NEW) public void process(Object obj) { // do some work with obj that must be in the scope of a transaction this.mgr.merge(obj); // ... this.mgr.merge(obj); // ... this.mgr.flush(); } } but I'm still curious if it's possible to accomplish this in one class. It looks to me like the transaction manager only operates at the bean level, even when individual methods are given more specific annotations. So if I mark one method in a way to prevent the transaction from starting calling other methods within that same instance will also not create a transaction, no matter how they're marked? I'm using JBoss Application Server 4.2.1.GA, but non-specific answers are welcome / preferred.

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