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  • Handy Javascript array Extensions &ndash; distinct()

    - by Liam McLennan
    The following code adds a method to javascript arrays that returns a distinct list of values. Array.prototype.distinct = function() { var derivedArray = []; for (var i = 0; i < this.length; i += 1) { if (!derivedArray.contains(this[i])) { derivedArray.push(this[i]) } } return derivedArray; }; and to demonstrate: alert([1,1,1,2,2,22,3,4,5,6,7,5,4].distinct().join(',')); This produces 1,2,22,3,4,5,6,7

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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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  • Make the JavaScript Test Pass

    Add code on the commented line: var f = function () { var value = // ??? return f.sum = (f.sum || 0) + value;} ... to make the following QUnit test pass: test("Running sum", function () { equals(f(3), 3); equals(f(3), 6); equals(f(4), 10); jQuery([1, 2, 3]).each(f); equals(f(0), 16); }); Possible Answer It's a goofy scenario, but one possible solution uses a technique you'll see frequently inside today's JavaScript libraries. First, we'll need to use the implicit arguments parameter inside...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • Getting into C# and MVC4 coming from Javascript

    - by Stefan V.
    Let me know if this is the wrong place to ask this but, I am trying to get into a backend/server language coming from a front-end javascript background (vanilla, angular, jQuery and a bit of node and mongodb, also some experience with PHP and MySQL). Why C#? My company's entire server-side is MVC4. Occasionally, I am going through commits of the backend guys and have asked them all sorts of questions. A lot of what I have heard and seen just seems appealing. Anyway, I'd rather start with C# first and gradually adopt .NET MVC. Does anybody advice, tips, recommended books, etc for somebody trying to learn C# coming from a JS background?

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  • All around design book for a developer (Javascript dev)

    - by Alex Angelini
    I have begun doing a lot of javascript development recently, mostly front-end but also using node.js. As I am currently in the transition from large company to startup, they expect me as a front end developer to know how to produce semi decent designs (Which I cannot) I am looking for a book (or set of screencasts) to give me some good well rounded advice on design. I know CSS, but my design are always awful looking, I also know nothing about Photoshop (and am on Linux and have no access to it) What are your picks? I am not looking to be a full time designer I would just like to be able to contribute.

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  • Testing HTML5 and javascript code for iPhone and Android devices

    - by Pankaj Upadhyay
    I have developed a simple HTML5 webpage that uses a javascript file. This is a fun learning page so I wanted to know as to how will they show up on mobile devices like iPhone and Android smartphones. The pages are hosted on a server and i have tested the thing on my desktop. But, how can i test the same for these mobile devices. i.e. how the page will look on mobile and stuff. I don't have an iPhone or Android. There is no serious development going in here so i was thinking if there is some free website or tool that acts as a iPhone or android browser. The main aim is just to see how the webpage will show up on an android phone.

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  • Javascript Tips and Tricks

    - by ybbest
    1. Replace all , in one Javascript string. var totalAmount= "100,000,000,000"; var find= ","; //Replace the first , with the empty string var replace=""; totalAmount= totalAmount.replace(find,replace); alert(totalAmount); var totalAmount2= "100,000,000,000"; var newFind=/,/g //Replace all , with empty string totalAmount2= totalAmount2.replace(newFind,replace); alert(totalAmount2);

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  • Google I/O 2012 - How we Make JavaScript Widgets Scream

    Google I/O 2012 - How we Make JavaScript Widgets Scream Malte Ubl, John Hjelmstad When loading websites every millisecond counts. Social widgets should enhance a website experience and they should definitely not slow it down. We'll walk through the unique challenges of loading social widgets such as the +1 button and how we made sure that they load as fast as possible -- yes, there will be war stories! While we'll focus on widget performance, many of the techniques we used have wider applicability and we'll show how they can make your website faster, too. For all I/O 2012 sessions, go to developers.google.com From: GoogleDevelopers Views: 734 3 ratings Time: 51:44 More in Science & Technology

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  • Javascript Tips and Tricks

    - by ybbest
    1. Replace all , in one Javascript string. var totalAmount= "100,000,000,000"; var find= ","; //Replace the first , with the empty string var replace=""; totalAmount= totalAmount.replace(find,replace); alert(totalAmount); var totalAmount2= "100,000,000,000"; var newFind=/,/g //Replace all , with empty string totalAmount2= totalAmount2.replace(newFind,replace); alert(totalAmount2);

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  • Keypress : une nouvelle bibliothèque JavaScript voit le jour, pour interagir avec les événements du clavier

    Une nouvelle bibliothèque JavaScript voit le jour pour interagir avec les touches du clavier La bibliothèque Keypress permet de capturer les événements clavier et propose plusieurs fonctionnalités avancées associées à ces événements. Elle est simple à utiliser, ne pèse que 9kb et n'a aucune dépendance. Elle peut donc être installée seule sans se soucier d'une éventuelle présence d'une autre bibliothèque (comme beaucoup qui sont basées sur jQuery par exemple). Keypress se veut facile à intégrer et à utiliser, cependant, la bibliothèque est encore soumise aux retours utilisateurs et est donc susceptible d'être modifiée. Si vous recherchez une bibliothèque stable, et que vous n'êtes pas intéressé par...

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  • Video: How To Enable JavaScript IntelliSense

    Check out this How-to Enable JavaScript IntelliSense with DevExpress ASP.NET Clientside objects video: The video walks you through few simple steps it takes to get IntelliSense support for the Clientside objects of our ASP.NET controls. If youd like to see a written version, check out this detailed blog post. Watch the how-to video and then drop me a line below with your thoughts on this excellent feature.   Want to experience a better Visual Studio? Install CodeRush by downloading...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • What changes does McAfee make to the registry?

    - by AUTO
    I'm wondering if anyone knows exactly what McAfee does to the registry. I've got a computer on which JavaScript no longer works. I read online that McAfee replaces the script interpreter dll path in the registry to point to its own dll, which filters, and in turn calls the official "jscript.dll". I found multiples of these in the registry, and corrected them, but it still hasn't fixed the problem - JavaScript still does not work. I'm considering just reinstalling, and then re-uninstalling McAfee to fix it. However, for the record, I still want to know if anyone has, or can provide an online list of all the changes McAfee makes to the registry. Details: Windows 8 x64I found these JScript registry changes: HKEY_CLASSES_ROOT\CLSID\{f414c260-6ac0-11cf-b6d1-00aa00bbbb58} HKEY_CLASSES_ROOT\CLSID\{f414c261-6ac0-11cf-b6d1-00aa00bbbb58}

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  • Getting Classic ASP to work in .js files under IIS 7

    - by Abdullah Ahmed
    I am moving a clients classic asp webapp to a new IIS7 based server. The site contains some .js files which have javascript but also classic asp in <% % tags which contains a bunch of conditional statements designed to spit out pieces of javascript based on session state variables. Here's a brief example of what the file could be like.... var arrHOFFSET = -1; var arrLeft ="<"; var arrRight = ">"; <% If ((Session("dashInv") = "True") And ((Session("systemLevelStaff") = "4") Or (Session("systemLevelCompany") = "4"))) Then %> addMainItem("/MgmtTools/WelcomeInventory.asp?wherefrom=salesMan","",81,"center","","",0,0,"","","","",""); <% Else %> <% If (Session("dashInv") = "False") And ((Session("systemLevelStaff") = "4") Or (Session("systemLevelCompany") = "4")) Then %> <% Else %> addMainItem("/calendar/welcome.asp","",81,"center","","",0,0,"","","","",""); <% End If %> <% End If %> defineSubmenuProperties(135,"center","center",-3,0,"","","","","","",""); Currently this file (named custom.js for example) will start throwing js errors, because the server doesnt seem to recognize the asp code in it and therefore does not parse it. I know I need to somehow specify that a .js file should also be treated like an .asp file and run through parsing it. However I am not sure how to go about doing this. Here is what I've tried so far... Under the Server node in IIS under HANDLER MAPPINGS I created a new Script Map with the following settings. Request Path: *.js Executable: C:\Windows\System32\inetsrv\asp.dll Name: ASPClassicInJSFiles Mapping: Invoke Handler only if request is mapped to : File Verbs: All verbs Access: Script I also created a similar handler under the site node itself. Under MIME Types .js is defined as application/x-javascript None of these work. If I simply rename the file to have .asp extension then things work, however this app is poorly coded and has literally 100's of files with the .js files included in them under various names and locations, so rename, search and replace is the last option I have.

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  • Make Firefox left-click open in current tab, and middle-click open in new tab

    - by endolith
    I'm sick of the inconsistent behavior of clicking on links in Firefox. I want control of where they open up. If I'm done with a page and want to replace it with the link I am clicking, I left-click. If there are things I want to look at in the future, but I'm not done with this page yet, I'll middle-click. This normally works, but there are exceptions. If the website designer uses target="_blank", my left-click is overridden and the link opens in a new tab/window. If the links are javascript, a middle-click rarely works. I get an (Untitled) tab with some javascript as the URL. etc. How do I fix these things and get consistent clicking on links?

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  • How to get Firefox Greasemonkey script to use a local cascading stylesheet?

    - by Umber Ferrule
    What's the correct syntax to link to a CSS file in the same directory as a Greasemonkey JavaScript? I've tried the following but it doesn't work: var cssNode = document.createElement('link'); cssNode.type = 'text/css'; cssNode.rel = 'stylesheet'; cssNode.href = 'example.css'; cssNode.media = 'screen'; cssNode.title = 'dynamicLoadedSheet'; document.getElementsByTagName("head")[0].appendChild(cssNode); If I can get this to work, it would be a lot easier than encasing CSS changes in JavaScript.

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  • Getting Classic ASP to work in .js files under IIS 7

    - by Abdullah Ahmed
    I am moving a clients classic asp webapp to a new IIS7 based server. The site contains some .js files which have javascript but also classic asp in <% % tags which contains a bunch of conditional statements designed to spit out pieces of javascript based on session state variables. Here's a brief example of what the file could be like.... var arrHOFFSET = -1; var arrLeft ="<"; var arrRight = ">"; <% If ((Session("dashInv") = "True") And ((Session("systemLevelStaff") = "4") Or (Session("systemLevelCompany") = "4"))) Then %> addMainItem("/MgmtTools/WelcomeInventory.asp?wherefrom=salesMan","",81,"center","","",0,0,"","","","",""); <% Else %> <% If (Session("dashInv") = "False") And ((Session("systemLevelStaff") = "4") Or (Session("systemLevelCompany") = "4")) Then %> <% Else %> addMainItem("/calendar/welcome.asp","",81,"center","","",0,0,"","","","",""); <% End If %> <% End If %> defineSubmenuProperties(135,"center","center",-3,0,"","","","","","",""); Currently this file (named custom.js for example) will start throwing js errors, because the server doesnt seem to recognize the asp code in it and therefore does not parse it. I know I need to somehow specify that a .js file should also be treated like an .asp file and run through parsing it. However I am not sure how to go about doing this. Here is what I've tried so far... Under the Server node in IIS under HANDLER MAPPINGS I created a new Script Map with the following settings. Request Path: *.js Executable: C:\Windows\System32\inetsrv\asp.dll Name: ASPClassicInJSFiles Mapping: Invoke Handler only if request is mapped to : File Verbs: All verbs Access: Script I also created a similar handler under the site node itself. Under MIME Types .js is defined as application/x-javascript None of these work. If I simply rename the file to have .asp extension then things work, however this app is poorly coded and has literally 100's of files with the .js files included in them under various names and locations, so rename, search and replace is the last option I have.

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  • Force-refreshing only JavaScript files in Firefox and Chrome

    - by Graviton
    I want to clear only JavaScript files from my web browsers (Firefox and Chrome). I am doing JavaScript debugging, and it's annoying that my JS just won't get updated whenever I change my JS files. The only thing I can do now is to clear my cookies, but doing that erases all of my browsing history. How can I clear/refresh the JavaScript files that have been loaded into my browsers without clearing out other files?

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  • Analytics on Mobile Phones

    - by Samuh
    Tracking events and setting up Analytics for Websites seems easy. You create an account with one of the Analytics service providers like Google. They give you javascript code that you embed in your pages (whichever event you wish to track) and voila..you're done. I have written a native application for Android phones, which is actually an adaptation of the actual web site. Now, I am required to setup Analytics and tracking for this native application. Question: How to do this on Mobile phones from within a native application? We have Java Script code that works for the original web site. Is there a way to incorporate that in the native application? I know Android supports Java Script via WebViews(Webkit);my application does not have webviews and it is native. Also, I have not worked on JavaScript since school so excuse me if I sound naive. Thanks.

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  • Getting Query Parameters in Javascript

    - by PhubarBaz
    I find myself needing to get query parameters that are passed into a web app on the URL quite often. At first I wrote a function that creates an associative array (aka object) with all of the parameters as keys and returns it. But then I was looking at the revealing module pattern, a nice javascript design pattern designed to hide private functions, and came up with a way to do this without even calling a function. What I came up with was this nice little object that automatically initializes itself into the same associative array that the function call did previously. // Creates associative array (object) of query params var QueryParameters = (function() {     var result = {};     if (window.location.search)     {         // split up the query string and store in an associative array         var params = window.location.search.slice(1).split("&");         for (var i = 0; i < params.length; i++)         {             var tmp = params[i].split("=");             result[tmp[0]] = unescape(tmp[1]);         }     }     return result; }()); Now all you have to do to get the query parameters is just reference them from the QueryParameters object. There is no need to create a new object or call any function to initialize it. var debug = (QueryParameters.debug === "true"); or if (QueryParameters["debug"]) doSomeDebugging(); or loop through all of the parameters. for (var param in QueryParameters) var value = QueryParameters[param]; Hope you find this object useful.

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  • Partial template specialization of free functions - best practices

    - by Poita_
    As most C++ programmers should know, partial template specialization of free functions is disallowed. For example, the following is illegal C++: template <class T, int N> T mul(const T& x) { return x * N; } template <class T> T mul<T, 0>(const T& x) { return T(0); } // error: function template partial specialization ‘mul<T, 0>’ is not allowed However, partial template specialization of classes/structs is allowed, and can be exploited to mimic the functionality of partial template specialization of free functions. For example, the target objective in the last example can be achieved by using: template <class T, int N> struct mul_impl { static T fun(const T& x) { return x * N; } }; template <class T> struct mul_impl<T, 0> { static T fun(const T& x) { return T(0); } }; template <class T, int N> T mul(const T& x) { return mul_impl<T, N>::fun(x); } It's more bulky and less concise, but it gets the job done -- and as far as users of mul are concerned, they get the desired partial specialization. My questions is: when writing templated free functions (that are intended to be used by others), should you automatically delegate the implementation to a static method function of a class, so that users of your library may implement partial specializations at will, or do you just write the templated function the normal way, and live with the fact that people won't be able to specialize them?

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  • Big-O of PHP functions?

    - by Kendall Hopkins
    After using PHP for a while now, I've noticed that not all PHP built in functions as fast as expected. Consider the below two possible implementations of a function that finds if a number is prime using a cached array of primes. //very slow for large $prime_array $prime_array = array( 2, 3, 5, 7, 11, 13, .... 104729, ... ); $result_array = array(); foreach( $array_of_number => $number ) { $result_array[$number] = in_array( $number, $large_prime_array ); } //still decent performance for large $prime_array $prime_array => array( 2 => NULL, 3 => NULL, 5 => NULL, 7 => NULL, 11 => NULL, 13 => NULL, .... 104729 => NULL, ... ); foreach( $array_of_number => $number ) { $result_array[$number] = array_key_exists( $number, $large_prime_array ); } This is because in_array is implemented with a linear search O(n) which will linearly slow down as $prime_array grows. Where the array_key_exists function is implemented with a hash lookup O(1) which will not slow down unless the hash table gets extremely populated (in which case it's only O(logn)). So far I've had to discover the big-O's via trial and error, and occasionally looking at the source code. Now for the question... I was wondering if there was a list of the theoretical (or practical) big O times for all* the PHP built in functions. *or at least the interesting ones For example find it very hard to predict what the big O of functions listed because the possible implementation depends on unknown core data structures of PHP: array_merge, array_merge_recursive, array_reverse, array_intersect, array_combine, str_replace (with array inputs), etc.

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  • DLL Exports: not all my functions are exported

    - by carmellose
    I'm trying to create a Windows DLL which exports a number of functions, howver all my functions are exported but one !! I can't figure it out. The macro I use is this simple one : __declspec(dllexport) void myfunction(); It works for all my functions except one. I've looked inside Dependency Walker and here they all are, except one. How can that be ? What would be the cause for that ? I'm stuck. Edit: to be more precise, here is the function in the .h : namespace my { namespace great { namespace namespaaace { __declspec(dllexport) void prob_dump(const char *filename, const double p[], int nx, const double Q[], const double xlow[], const char ixlow[], const double xupp[], const char ixupp[], const double A[], int my, const double bA[], const double C[], int mz, const double clow[], const char iclow[], const double cupp[], const char icupp[] ); }}} And in the .cpp file it goes like this: namespace my { namespace great { namespace namespaaace { namespace { void dump_mtx(std::ostream& ostr, const double *mtx, int rows, int cols, const char *ind = 0) { /* some random code there, nothing special, no statics whatsoever */ } } // end anonymous namespace here // dump the problem specification into a file void prob_dump( const char *filename, const double p[], int nx, const double Q[], const double xlow[], const char ixlow[], const double xupp[], const char ixupp[], const double A[], int my, const double bA[], const double C[], int mz, const double clow[], const char iclow[], const double cupp[], const char icupp[] ) { std::ofstream fout; fout.open(filename, std::ios::trunc); /* implementation there */ dump_mtx(fout, Q, nx, nx); } }}} Thanks

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  • How to call functions inside a C dll which take pointers as arguments from C#

    - by AndrejaKo
    Hi people, this is my first post here! I'm trying to make a windows forms program using C# which will use a precompiled C library. It will access a smart card and provide output from it. For the library, I have a .dll, .lib and .h and no source. In the .h file there are several structs defined. Most interesting functions of the .dll expect pointers to allocated structs as arguments. I've been calling functions inside the .dll like this: For example function EID_API int WINAPI EidStartup(int nApiVersion); would be called like this [DllImport("CelikApi.dll")]//the name of the .dll public static extern int EidStartup(int nApiVersion); Now my problem is that I can't find equivalent of C's pointers which point to dynamically allocated structures in memory in C#, so I don't know what to pass as argument to functions which take C pointers. I don't have much experience in C#, but to me its use looked as the easiest way of making the program I need. I tried with C++, but Visual Studio 2010 doesn't have IntelliSense for C++/CLR. If you can point me to something better, feel free to do so.

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  • pure/const functions in C++

    - by Albert
    Hi, I'm thinking of using pure/const functions more heavily in my C++ code. (pure/const attribute in GCC) However, I am curious how strict I should be about it and what could possibly break. The most obvious case are debug outputs (in whatever form, could be on cout, in some file or in some custom debug class). I probably will have a lot of functions, which don't have any side effects despite this sort of debug output. No matter if the debug output is made or not, this will absolutely have no effect on the rest of my application. Or another case I'm thinking of is the use of my own SmartPointer class. In debug mode, my SmartPointer class has some global register where it does some extra checks. If I use such an object in a pure/const function, it does have some slight side effects (in the sense that some memory probably will be different) which should not have any real side effects though (in the sense that the behaviour is in any way different). Similar also for mutexes and other stuff. I can think of many complex cases where it has some side effects (in the sense of that some memory will be different, maybe even some threads are created, some filesystem manipulation is made, etc) but has no computational difference (all those side effects could very well be left out and I would even prefer that). How does it work out in practice? If I mark such functions as pure/const, could it break anything (considering that the code is all correct)?

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