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• Code and Slides: Getting Started Building Windows 8 HTML/JavaScript Metro Apps

  - by dwahlin

  This presentation is from a talk I gave at the spring 2012 DevConnections conference. It covers some of the key topics you need to know to get started building Windows 8 HTML/JavaScript Metro apps including navigation options, UI surfaces that can be used, controls, data binding and templates, and animations. View more of my presentations here. Sample code shown in the presentation can be found here. A large number of samples are available in the Windows 8 SDK which can be found here.

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• What is this JavaScript gibberish?

  - by W3Geek

  I am studying how to make a 2D game with JavaScript by reading open source JavaScript games and I came across this gibberish... aSpriteData = [ "}\"¹-º\"À+º\"À+º\"À+º\"¿¤À ~C_ +º\"À+º\"À+º\"À*P7²OK%¾+½u_\"À<¡a¡a¡bM@±@ª", // 0 ground "a ' ![± 7°³b£[mt<Nµ7z]~¨OR»[f_7l},tl},+}%XN²Sb[bl£[±%Y_¹ !@ $", // 1 qbox "!A % @,[] ±}°@;µn¦&X£ <$ §¤ 8}}@Prc'U#Z'H'@· ¶\"is ¤&08@£(", // 2 mario " ´!A.@H#q8¸»e-½n®@±oW:&X¢a<&bbX~# }LWP41}k¬#3¨q#1f RQ@@:4@$", // 3 mario jump " 40 q$!hWa-½n¦#_Y}a©,0#aaPw@=cmY<mq©GBagaq&@q#0§0t0¤ $", // 4 mario run "+hP_@", // 5 pipe left "¢,6< R¤", // 6 pipe right "@ & ,'+hP?>³®'©}[!»¹.¢_^¥y/pX¸#µ°=a¾½hP?>³®'©}[!»¹.¢_^ Ba a", // 7 pipe top left "@ , !] \"º £] , 8O #7a&+¢ §²!cº 9] P &O ,4 e", // 8 pipe top right " £ #! ,! P!!vawd/XO¤8¼'¤P½»¹²'9¨ \"P²Pa²(!¢5!N*(4´b!Gk(a", // 9 goomba " Xu X5 =ou!¯­¬a[Z¼q.°u#|xv ¸··@=~^H'WOJ!¯­¬a=Nu ²J <J a", // 10 coin // yui "@ & !MX ~L \"y %P *¢ 5a K w !L \"y %P *­a%¬¢ 4 a", // 11 ebox // yui "¢ ,\"²+aN!@ &7 }\"²+aN!XH # }\"²+aN!X% 8}\"²+aN!X%£@ (", // 12 bricks "} %¿¢!N° I¨²*<P%.8\"h,!Cg r¥ H³a4X¢*<P%.H#I¬ :a!u !q", // 13 block makeSpace(20) + "4a }@ }0 N( w$ }\" N! +aa", // 14 bush left " r \"²y!L%aN zPN NyN#²L}[/cy¾ N" + makeSpace(18) + "@", // 15 bush mid makeSpace(18) + "++ !R·a!x6 &+6 87L ¢6 P+ 8+ (", // 16 bush right " %©¦ +pq 7> \"³ s" + makeSpace(25) + "@", // 17 cloud bottom left "a/a_#².Q¥'¥b}8.£¨7!X\"K+5cqs%(" + makeSpace(18) + "0", // 18 cloud bottom mid "bP ¢L P+ 8%a,*a%§@ J" + makeSpace(22) + "(", // 19 cloud bottom right "", // 20 mushroom "", // koopa 16x24 "", // 22 star "", // 23 flagpole "", // 24 flag "", // 25 flagpole top " 6 ~ }a }@ }0 }( }$ }\" }! } a} @} 0} (} $} \"² $", // 26 hill slope "a } \"m %8 *P!MF 5la\"y %P" + makeSpace(18) + "(", // 27 hill mid makeSpace(30) + "%\" t!DK \"q", // 28 hill top "", // 29 castle bricks "", // 30 castle doorway bottom "", // 31 castle doorway top "", // 32 castle top "", // 33 castle top 2 "", // 34 castle window right "", // 35 castle window left "", // 36 castle flag makeSpace(19) + "8@# (9F*RSf.8 A¢$!¢040HD", // 37 goomba flat " *(!¬#q³¡[_´Yp~¡=<¥g=&'PaS²¿ Sbq*<I#*£Ld%Ryd%¼½e8H8bf#0a", // 38 mario dead " = ³ #b 'N¶ Z½Z Z½Z Z½Z Z½Z Z½Z Z½Z =[q ²@ ³ ¶ 0", // 39 coin step 1 " ?@ /q /e '¤ #³ !ºa }@ N0 ?( /e '¤ #³ ¿ _a \"", // 40 coin step 2 " / > ] º !² #¢ %a + > ] º !² #¢ 'a \"", // 41 coin step 3 " 7¢ +² *] %> \"p !Ga t¢ I² 4º *] %> \"p ¡ Oa \"" // 42 coin step 4 ], What does it do? If you want to look at the source file here it is: http://www.nihilogic.dk/labs/mario/mario.js Beware, there is more gibberish inside. I can't seem to make sense of any of it. Thank you.

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• What if(event) statement means in JavaScript?

  - by j flo

  I'm rather new to JavaScript and programming in general so I am pretty much only used to seeing if statements that have some kind of comparison operator like, if (x < 10) or if(myBool). I have seen an if statement checking against an event, but I don't understand what or why the event is being checked like that. What's the semantic meaning behind that check or comparison? Here is the code in question: if(event){ event.preventDefault(); }

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• Javascript SDK on Facebook

  - by Eamonn Fox

  I am trying to use the Javascript SDK for Facebook but I keep getting the message : Given URL is not permitted by the application configuration.: One or more of the given URLs is not allowed by the App's settings. It must match the Website URL or Canvas URL, or the domain must be a subdomain of one of the App's domains but I have copied and pasted my canvas URL from the settings section. Anyone any ideas whats up?

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• Examples of good Javascript/HTML5 based games

  - by Zuch

  Now that Flash is largely being replaced with HTML5 elements (video, audio, canvas, etc.) are there any good examples of web-based games built on completely open standards (meaning Javascript, HTML and CSS)? I see a lot of examples of pure HTML5 implementations of what was once only in Flash (like stuff here: http://www.html5rocks.com/) but not many games, a domain which still seem dominated by Flash. I'm curious what's possible and what the limitations are.

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• Object detection in bitmap JavaScript canvas

  - by fallenAngel

  I want to detect clicks on canvas elements which are drawn using paths. So far I have stored element paths in a JavaScript data structure and then check the coordinates of hits which match the element's coordinates. Rendering each element path and checking the hits would be inefficient when there are a lot of elements. I believe there must be an algorithm for this kind of coordinate search, can anyone help me with this?

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• Car animations in Frogger on Javascript

  - by Mijoro Nicolas Rasoanaivo

  I have to finish a Frogger game in Javascript for my engineering school degree, but I don't know how to animate the cars. Right now I tried to manipulate the CSS, the DOM, I wrote a script with a setTimeout(), but none of them works.Can I have some help please? Here's my code and my CSS: <html> <head> <title>Image d&eacute;filante</title> <link rel="stylesheet" type="text/css" href="map_style.css"/> </head> <body onload="start()"> <canvas id="jeu" width="800" height="450"> </canvas> <img id="voiture" class="voiture" src="car.png" onload="startTimerCar()"> <img id="voiture2" class="voiture" src="car.png" onload="startTimerCar()"> <img id="voiture3" class="voiture" src="car.png" onload="startTimerCar()"> <img id="bigrig" class="bigrig" src="bigrig.png" onload="startTimerBigrig()"> <img id="bigrig2" class="bigrig" src="bigrig.png" onload="startTimerBigrig()"> <img id="bigrig3" class="bigrig" src="bigrig.png" onload="startTimerBigrig()"> <img id="hotrod" src="hotrod.png" onload="startTimerHotrod()"> <img id="hotrod2" src="hotrod.png" onload="startTimerHotrod()"> <img id="turtle" src="turtles_diving.png" onload="startTimerTurtle()"> <img id="turtle2" src="turtles_diving.png" onload="startTimerTurtle()"> <img id="turtle3" src="turtles_diving.png" onload="startTimerTurtle()"> <img id="small" src="log_small.png" onload="startTimerSmall()"> <img id="small2" src="log_small.png" onload="startTimerSmall()"> <img id="small3" src="log_small.png" onload="startTimerSmall()"> <img id="small4" src="log_small.png" onload="startTimerSmall()"> <img id="med" src="log_medium.png" onload="startTimerMedium()"> <img id="med2" src="log_medium.png" onload="startTimerMedium()"> <img id="med3" src="log_medium.png" onload="startTimerMedium()"> <script type="text/javascript"> var X = 1; var timer; function start(){ setInterval(init,10); document.onkeydown = move; var canvas = document.getElementById('jeu'); var context = canvas.getContext('2d'); var frog = document.getElementById('frog'); var posX_frog = 415; var posY_frog = 400; var voiture = [document.getElementById('voiture'),document.getElementById('voiture2'),document.getElementById('voiture3')]; var bigrig = [document.getElementById('bigrig'),document.getElementById('bigrig2'),document.getElementById('bigrig3')]; var hotrod = [document.getElementById('hotrod'),document.getElementById('hotrod2')]; var turtle = [document.getElementById('turtle'),document.getElementById('turtle2'),document.getElementById('turtle3')]; var small = [document.getElementById('small'),document.getElementById('small2'),document.getElementById('small3'),document.getElementById('small4')]; var med = [document.getElementById('med'),document.getElementById('med2'),document.getElementById('med3')]; function init() { context.fillStyle = "#AEEE00"; context.fillRect(0,0,800,50); context.fillRect(0,200,800,50); context.fillRect(0,400,800,50); context.fillStyle = "#046380"; context.fillRect(0,50,800,150); context.fillStyle = "#000000"; context.fillRect(0,250,800,150); var img= new Image(); img.src="./frog.png"; context.drawImage(img,posX_frog, posY_frog, 46, 38); } function move(event){ if (event.keyCode == 39){ if( posX_frog < 716 ){ posX_frog += 50; } } if(event.keyCode == 37){ if( posX_frog >25 ){ posX_frog -= 50; } } if (event.keyCode == 38){ if( posY_frog > 10 ){ posY_frog -= 50; } } if(event.keyCode == 40){ if( posY_frog <400 ){ posY_frog += 50; } } } } </script> </body> And my map_css: #jeu{ z-index:10; width: 800px; height: 450px; border: 2px black solid; overflow: hidden; position: relative; transition:width 2s; -moz-transition:width 2s; /* Firefox 4 */ -webkit-transition:width 2s; /* Safari and Chrome */ } #voiture{ z-index: 100; position: absolute; top: 315px; left: 48px; transition-timing-function: linear; -webkit-transition-timing-function: linear; -moz-transition-timing-function: linear; } #voiture2{ z-index: 100; position: absolute; top: 315px; left: 144px; } #voiture3{ z-index: 100; position: absolute; top: 315px; left: 240px; } #bigrig{ z-index: 100; position: absolute; top: 365px; left: 200px; } #bigrig2{ z-index: 100; position: absolute; top: 365px; left: 400px; } #bigrig3{ z-index: 100; position: absolute; top: 365px; left: 600px; } #hotrod{ z-index: 100; position: absolute; top: 265px; left: 200px; } #hotrod2{ z-index: 100; position: absolute; top: 265px; left: 500px; } #hotrod3{ z-index: 100; position: absolute; top: 265px; left: 750px; } #turtle{ z-index: 100; position: absolute; top: 175px; left: 50px; } #turtle2{ z-index: 100; position: absolute; top: 175px; left: 450px; } #turtle3{ z-index: 100; position: absolute; top: 175px; left: 250px; } #small{ z-index: 100; position: absolute; top: 125px; left: 20px; } #small2{ z-index: 100; position: absolute; top: 125px; left: 220px; } #small3{ z-index: 100; position: absolute; top: 125px; left: 420px; } #small4{ z-index: 100; position: absolute; top: 125px; left: 620px; } #med{ z-index: 100; position: absolute; top: 75px; left: 120px; } #med2{ z-index: 100; position: absolute; top: 75px; left: 320px; } #med3{ z-index: 100; position: absolute; top: 75px; left: 520px; } I had to say that I'm in the obligation to code in HTML5, CSS3, and Javascript but not jQuery, who is way more easier, I already created games in jQuery... It takes me too much time and too much code lines right here.

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• Examples of good Javascript/HTML5 based games

  - by Zuch

  Now that Flash is largely being replaced with HTML5 elements (video, audio, canvas, etc.) are there any good examples of web-based games built on completely open standards (meaning Javascript, HTML and CSS)? I see a lot of examples of pure HTML5 implementations of what was once only in Flash (like stuff here: http://www.html5rocks.com/) but not many games, a domain which still seem dominated by Flash. I'm curious what's possible and what the limitations are.

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• preview form using javascript in popup

  - by user1015309

  please I need some help in previewing a form in popup. I have a form, quite big, so I added the option of preview to show as popup. The lightbox form popup works well, but the problem I now have is function passform ()passing the inputs(textfield, select, checkbox, radio) into the popup page for preview on Click(). Below are my javascript and html codes. I left the css and some html out, because I think they're not needed. I will appreciate your help. Thank you The Javascript function gradient(id, level) { var box = document.getElementById(id); box.style.opacity = level; box.style.MozOpacity = level; box.style.KhtmlOpacity = level; box.style.filter = "alpha(opacity=" + level * 100 + ")"; box.style.display="block"; return; } function fadein(id) { var level = 0; while(level <= 1) { setTimeout( "gradient('" + id + "'," + level + ")", (level* 1000) + 10); level += 0.01; } } // Open the lightbox function openbox(formtitle, fadin) { var box = document.getElementById('box'); document.getElementById('shadowing').style.display='block'; var btitle = document.getElementById('boxtitle'); btitle.innerHTML = formtitle; if(fadin) { gradient("box", 0); fadein("box"); } else { box.style.display='block'; } } // Close the lightbox function closebox() { document.getElementById('box').style.display='none'; document.getElementById('shadowing').style.display='none'; } //pass form fields into variables var divexugsotherugsexams1 = document.getElementById('divexugsotherugsexams1'); var exugsotherugsexams1 = document.form4.exugsotherugsexams1.value; function passform() { divexugsotherugsexams1.innerHTML = document.form4.exugsotherugsexams1.value; } The HTML(with just one text field try): <p><input name="submit4" type="submit" class="button2" id="submit4" value="Preview Note" onClick="openbox('Preview Note', 1)"/> </p> <div id="shadowing"></div> <div id="box"> <span id="boxtitle"></span> <div id="divexugsotherugsexams1"></div> <script>document.write('<PARAM name="SRC" VALUE="'+exugsotherugsexams1+'">')</script> <a href="#" onClick="closebox()">Close</a> </div>

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• Looking for an open source JavaScript table sort function with multiple column sorting and filters [closed]

  - by Wikis

  I have an HTML table that I'd like to add sorting to. I've already used sorttable but I've found that, with our current installation, the default sorting works in Firefox and Chrome but not Internet Explorer. So I'm looking for a new tool. I'm working my way through this list of 33 sorters but I'm wondering whether anyone has solved this? The requirements are: open source (free to use) can sort one or more columns (like tablesorter) can filter columns (like this from the javascript toolbox) easy to use

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• Is my JavaScript/jQuery methodology good? [migrated]

  - by absentx

  I am seeking critique on what has become my normal methodology of writing JavaScript code. I have become heavily reliant on the jQuery library, but I think this has helped me learn the native language better also. Anyway, please critique the following style of JavaScript coding... Buried are a lot of questions of scope; if you could point out the strengths and weaknesses of this style I would appreciate it. var critique ={ start: function(){ globalness = 'GLOBAL-GLOBAL'; //Available to all critique's methods var notglobalness = 'LOCAL-LOCAL'; // Only available to critiques start method //Am I using the "method" teminology properly here?? $('#stuff').on('click','a.closer-target',function(){ $target = $(this); if($target.hasClass('active')){ $target.removeClass('active'); } else{ $target.addClass('active'); critique.madness($target); } }) console.log(notglobalness+': at least I am useful at home'); console.log('note here that: '+notglobalness+' is no longer available after this point, lets continue on:'); critique.madness(notglobalness); }, madness: function($e){ //Do a bunch of awesomeness with $e, //but continue to keep it seperate because you think its best to keep things isolated. //Send to the next function when complete here console.log('Here is globalness, which is still available from the start method of critique!! ' + globalness); console.log('Let us see if the globalness carries on to a new var object!!'); console.log('The locally isolated variable of NOTGLOBALNESS is available here, because it was passed to this method. Let us show it:'+$e); carryOn.start(); } } //end critique var carryOn={ start: function(){ console.log('any chance critique.globalness will work here??? lets see: ' +globalness); console.log('it absolutely does'); } } $(document).ready(critique.start); (I always struggle with which of the Stack Exchange sites is best to post "questions of theory" like this, but I think Programmers is the best, if not, as usual a mod will move it, etc...)

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• REST API at backend and MVC Javascript framework at client side

  - by Prashere

  I am building an online social network. I have finished writing RESTful API service using Django. This will return only JSON response (No HTML will be generated from server side) so that this JSON response can be used to build native smartphone apps. API service being common to all clients. My question is, since there is no HTML response from server side, can the MV* Javascript Frameworks like Angular / Backbone / Ember take care of complete Front-end, right from generating HTML page with CSS?

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• javascript adding javascript to iframe dynamically

  - by Sendoh

  The code below will add an iframe dynamically, is there a way to insert javascript to this iframe dynamically? Thx var iFrame = document.createElement('iframe'); var iFrameSRC = "http://www.google.com"; iFrame.name = 'hehe'; iFrame.id = 'hehe'; iFrame.src = iFrameSRC; iFrame.width = '1px'; iFrame.height = '1px'; iFrame.frameBorder = 0; iFrame.style.overflow = "hidden"; iFrame.style.align = "left"; iFrame.style.display = "block"; iFrame.style.fontSize = "10px"; bodyInner.appendChild(iFrame);

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• how to use javascript to add link to image element created using javascript

  - by parag

  how to add link for the image created using following javascript. thanks for any help or replies. for(var i=0; i<images.length; i++) { var t = document.createElement('IMG'); t.setAttribute('src',images[i]); t.setAttribute('border', 0); t.setAttribute('width',imageWidth); t.setAttribute('height',imageHeight); t.style.position = 'absolute'; t.style.visibility = 'hidden'; el.appendChild(t); }

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• confirm alert not working ....

  - by user318068

  I want the work of the Control Panel in my site for members ... I designed the page is displayed all the registered members on my site And i but it checkbox front each member name ,becuase it allowed to select multiple name then click delete button The following code works but now i want confirm alert before delete code working even , if clicked on ok the deletion is working , and if clicked on cancel the is not working .. how i can work it ?? while($row = mysql_fetch_array($sql1)) { ?> <tr> <td align="center" bgcolor="#FFFFFF"><input name="checkbox[]" type="checkbox" id="checkbox[]" value="<?php echo $row['MemberID']; ?>"></td> <td bgcolor="#FFFFFF"><?php echo $row['MemberName']; ; ?></td></tr> <?php } ?> <tr> <td colspan="5" align="center" bgcolor="#FFFFFF"><input name="delete" type="submit" id="delete" value="delete" onclick="javascript:return confirm('are you sure to delete this record???? ')"/></td> </tr> <?php $delete = $_REQUEST['delete']; $checkbox = $_REQUEST['checkbox']; $count = count($_REQUEST['checkbox']); // Check if delete button active, start this if($delete){ echo "<script language=\"Javascript\">\n"; for($i=0;$i<$count;$i++){ $del_id = $checkbox[$i]; $sql = "Delete FROM members where MemberID ='$del_id'"; $sq2 = "Delete FROM joinroom where MemberID ='$del_id'"; $result1 = mysql_query($sql); $result2 = mysql_query($sq2); echo "else {\n"; echo "alert ('Nothing deleted');\n }"; echo "</script>"; } } Thanks a lot.........

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• Alert is showing two times. how to restrict?

  - by Dev

  function test(myObject, flag) { if ( (flag) || ((event.keyCode == 59) || (event.which == 59)) || ((event.keyCode == 44) || (event.which == 44))) {alert(myObject.value);} } function closeWin() {self.close();} --foaram name='test' --textaarea name='textareaName' cols='44' rows='3' onChange='test(this, true);' --onKeyPress='test(this);' onBlur='test(this, true);' ---inpaut type='text' name='textName' --inpaut type='button' name='buttonName' onclick='closeWin();' value='Cancel' --/foarm I have a problem: when input value(e.g: test;) into textareaName field, the test function is always run more one time. Please show me the way can run this only one time.

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• What's a clean way to have the server return a JavaScript function which would then be invoked?

  - by Khnle

  My application is architected as a host of plug-ins that have not yet been written. There's a long reason for this, but with each new year, the business logic will be different and we don't know what it will be like (Think of TurboTax if that helps). The plug-ins consist of both server and client components. The server components deals with business logic and persisting the data into database tables which will be created at a later time as well. The JavaScript manipulates the DOM for the browsers to render afterward. Each plugin lives in a separate assembly, so that they won't disturb the main application, i.e., we don't want to recompile the main application. Long story short, I am looking for a way to return JavaScript functions to the client from an Ajax get request, and execute these JavaScript functions (which are just returned). Invoking a function in Javascript is easy. The hard part is how to organize or structure so that I won't have to deal with maintenance problem. So concat using StringBuilder to end up with JavaScript code as a result of calling toString() from the string builder object is out of the question. I want to have no difference between writing JavaScript codes normally and writing Javascript codes for this dynamic purpose. An alternative is to manipulate the DOM on the server side, but I doubt that it would be as elegantly as using jQuery on the client side. I am open for a C# library that supports chainable calls like jQuery that also manipulates the DOM too. Do you have any idea or is it too much to ask or are you too confused? Edit1: The point is to avoid recompiling, hence the plug-ins architecture. In some other parts of the program, I already use the concept of dynamically loading Javascript files. That works fine. What I am looking here is somewhere in the middle of the program when an Ajax request is sent to the server. Edit 2: To illustrate my question: Normally, you would see the following code. An Ajax request is sent to the server, a JSON result is returned to the client which then uses jQuery to manipulate the DOM (creating tag and adding to the container in this case). $.ajax({ type: 'get', url: someUrl, data: {'': ''}, success: function(data) { var ul = $('<ul>').appendTo(container); var decoded = $.parseJSON(data); $.each(decoded, function(i, e) { var li = $('<li>').text(e.FIELD1 + ',' + e.FIELD2 + ',' + e.FIELD3); ul.append(li); }); } }); The above is extremely simple. But next year, what the server returns is totally different and how the data to be rendered would also be different. In a way, this is what I want: var container = $('#some-existing-element-on-the-page'); $.ajax({ type: 'get', url: someUrl, data: {'': ''}, success: function(data) { var decoded = $.parseJSON(data); var fx = decoded.fx; var data = decode.data; //fx is the dynamic function that create the DOM from the data and append to the existing container fx(container, data); } }); I don't need to know, at this time what data would be like, but in the future I will, and I can then write fx accordingly.

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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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• Javascript storing data

  - by user985482

  Hi I am a beginner web developer and am trying to build the interface of a simple e-commerce site as a personal project.The site has multiple pages with checkboxes.When someone checks an element it retrives the price of the element and stores it in a variable.But when I go to the next page and click on new checkboxes products the variable automaticly resets to its original state.How can I save the value of that variable in Javascript? This is the code I've writen using sessionStorage but it still dosen't work when I move to next page the value is reseted. How can I wright this code so that i dosen't reset on each page change.All pages on my website use the same script. $(document).ready(function(){ var total = 0; $('input.check').click(function(){ if($(this).attr('checked')){ var check = parseInt($(this).parent().children('span').text().substr(1 , 3)); total+=check; sessionStorage.var_name=0 + total; alert(sessionStorage.var_name); }else{ var uncheck = parseInt($(this).parent().children('span').text().substr(1 , 3)); total-=uncheck; } })

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• How to Include Multiple Javascript Files in .NET (Like they do in rails)

  - by Kyle West

  I'm jealous of the rails guys. They can do this: <%= javascript_include_tag "all_min" %> ... and I'm stuck doing this: <script src="/public/javascript/jquery/jquery.js" type="text/javascript"></script> <script src="/public/javascript/jquery/jquery.tablesorter.js" type="text/javascript"></script> <script src="/public/javascript/jquery/jquery.tablehover.pack.js" type="text/javascript"></script> <script src="/public/javascript/jquery/jquery.validate.js" type="text/javascript"></script> <script src="/public/javascript/jquery/jquery.form.js" type="text/javascript"></script> <script src="/public/javascript/jquery/application.js" type="text/javascript"></script> Are there any libraries to compress, gzip and combine multiple js files? How about CSS files?

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• JavaScript: 2 window.opener.location.href statements with alert() in between not functioning

  - by vastbeyond

  I need to make a little JS app to scroll automatically through a list of URLs. I've chosen to have the functionality in a pop-up, for various reasons. The syntax to change the opening window's URL is: window.opener.location.href = "http://www.example.com"; This works fine with one URL, but if two statements are called, only one is executed. I experimented with an alert statement between two of the above statements, and the alert event made the second statement function properly: window.opener.location.href = "http://www.example1.com"; alert("hello world"); window.opener.location.href = "http://www.example2.com"; Question is: does anyone know how to get the first and second window.opener statements to work, without the intervening alert();? Also, how can I add a pause between the two statements, so that the second executes a couple of seconds after the first? Thanks so much!

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• JavaScript alert title header

  - by user329394

  I want to change JavaScript alert title header from displaying Internet Explorer to another name. is a way to do it? I found these site in the net: http://bytes.com/topic/javascript/answers/148721-change-title-bar-javascript-alert-box http://stackoverflow.com/questions/1905289/how-to-edit-a-javascript-alert-box-title Which say that there is no solution. Is it true there are no other way?

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• PHP javascript alert popup title header

  - by user329394

  Hi all i want to change javascript alert title header from displaying Internet Explorer to another name. is a way to do it? i found this site in the net : http://bytes.com/topic/javascript/answers/148721-change-title-bar-javascript-alert-box it seems no silution to it. http://stackoverflow.com/questions/1905289/how-to-edit-a-javascript-alert-box-title is it true there are no other way?? thx all.

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• Javascript Alert Return value / Event

  - by Chris

  Hey, The question is pretty simple, but i'm not the big AJAX/JS coder, so I have no clue if it's possible. Is there any way that I can check whether or not an alert() was executed on a remote site? Like if I inputted an alert("Welcome to this site"); through a get variable, is there any way to check if it that alert() was actually executed in the browser? And not necessarily through AJAX/JS.

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• how to use alert in php and js combined

  - by user295189

  have a need to alert through php, I have the code below. Problem is that it works as long as I dont use header redirect. But as soon as I use it..I loose alert. echo "I will do some functions here in php"; if($value == 1){ alert('ok working'); } header(location: 'someOtherpagethanthis.php');

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