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• event vs thread programming on server side.

  - by AlxPeter

  We are planning to start a fairly complex web-portal which is expected to attract good local traffic and I've been told by my boss to consider/analyse node.js for the serve side. I think scalability and multi-core support can be handled with an Nginx or Cherokee up in the front. 1) Is this node.js ready for some serious/big business? 2) Does this 'event/asynchronous' paradigm on server side has the potential to support the heavy traffic and data operation ? considering the fact that 'everything' is being processed in a single thread and all the live connections would be lost if it got crashed (though its easy to restart). 3) What are the advantages of event based programming compared to thread based style ? or vice-versa. (I know of higher cost associated with thread switching but hardware can be squeezed with event model.) Following are interesting but contradicting (to some extent) papers:- 1) http://www.usenix.org/events/hotos03/tech/full_papers/vonbehren/vonbehren_html 2) http://pdos.csail.mit.edu/~rtm/papers/dabek:event.pdf

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• JS Variable inside another variable

  - by Tusk

  I have a function that would use other variables, depending on what has been passed. Like this = ActionBar(slot) slot contains "one". and I would like to create a call inside that like object.slot.name but it should convert it before hand to make the command look like object.one.name. Is there a way to do this in javascript/jquery? I remember vaguely that some other language does this as {slot} or something like that. Sorry if this question was already asked, I've checked google and stackoverflow too, but didn't find an answer. Also I'd like to know what's the proper programming term for this kind of variable passing? Edited it cause of misunderstandings. I'm looking into OOP js, so object is an object, one is an object, and name is an attribute, but when passing I'm passing "one" as a string to the function. Tried eval, it doesn't work while dotted with an object.

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• JS DOM: Get elements by text content.

  - by hristo

  Hello! I am looking for a way to perform fulltext search on the DOM tree with JS. In two words, I would like to retrieve the list of text nodes which contain a given string. I've tried mootools' Element.getElements ( ':contains[string]' ) but I can't get it to work with strings containing whitespace. I'm thinking about simply indexing all text nodes and checking against each node for the string being searched for, but, in my project, there's no way of telling when the DOM updates in order to maintain such an index up-to-date. Any better ideas? Thanks

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• Problem loading js content with ajax

  - by Justin Goodman

  I have a page that loads content into a single div via a script in the page. It works fine but the problem is that I have a lightbox in one of the dynamically loaded pages that only works the first time you navigate to it (the script I got for the page loading is found here). Once you navigate to another area, then back again, the lightbox fails to work and instead just loads the plain image. It's been suggested that the easiest way to fix this would be to have a script unload the js and css that is loaded in with the page, then reload it when you go back to the gallery section. I'm a designer, not a developer though, so I don't know if this is true or not. Any help is really appreciated. The page can be found here: justgooddesign.net/graduation/

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• ext-js update params dynamically

  - by jeffkolez

  I'm building a search using ext-js. I have an event that fires on keyup. I want to be able to change either the URL I'm searching, or the params. I've had luck with neither. Here's my snippit of code: Ext.get("search").on('keyup', function() { proxy.url = '/customer/list?key=' + $('search').value; store.load(); }); But, no love for me. The store loads, but the proxy.url is the old value. Is what I'm trying to do possible? Thanks in advance!

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• Syntax error. Help with one small JS snippet :(

  - by Bogdan

  Hey guys. I don't know much JS, but I wanted to do some quick work with jQuery. But I've been staring at this for about an hour and I don't understand what I missed: <script type="text/javascript"> $('#qty_6035').change(function () { var substractedQty, stockQty, remQty; substractedQty = (int) $('#qty_6035').val(); // missing ; before statement stockQty = (int) $('#orig_qty_6035').val(); $('#rem_qty_6035').html(stockQty-substractedQty); }); </script> jQuery library is included at the beggining of the document. Thanks.

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• Image Replacement (JS/JQuery) working in IE but not FF

  - by Sunburnt Ginger

  I have tried multiple solutions for replacing broken images (both JS & jQuery) and all work perfectly with IE but not in FF, is there a reason for this? Are images handled differently in FF that may cause this? JQuery Example: $("img").error(function(){ $(this).unbind("error").attr("src", "nopic.jpg"); }); Javascript Example: (triggered by onError event in img tag) function noimage(img){ img.onerror=""; img.src="nopic.jpg"; return true; } Both of these examples work perfectly in IE but not at all in FF. What gives? Thanks in advance!

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• Using JS Methods in jQuery

  - by Wasabi

  In the following code snippet, the String.fromCharCode is used, can all JS methods be used within jQuery? Perhaps a noob question, but better to ask and prove a noob, then assume and be a fool. // Invoke setBodyClass when a key is pressed $(document).keyup(function(){ switch (String.fromCharCode(event.keyCode)){ case 'D': setBodyClass('default'); break; case 'N': setBodyClass('narrow'); break; case 'L': setBodyClass('large'); break; } });//end keyup

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• Caller property of JS for "foo = function()" style of coding

  - by arvind

  I want to use the property of "caller" for a function which is defined here It works fine for this style of function declaration function g() { alert(g.caller.name) // f } function f() { alert(f.caller.name) // undefined g() } f() JSfiddle for this But then my function declaration is something like g = function() { alert(g.caller.name) // expected f, getting undefined } f = function() { alert("calling f") alert(f.caller.name) // undefined g() } f() and I am getting undefined (basically not getting anything) JSfiddle for this Is there any way that I can use the caller property without having to rewrite my code? Also, I hope I have not made any mistakes in usage and function declaration since I am quite new to using JS.

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• jQuery Mobile button js control

  - by David

  I have a button that is not triggering event in jQuery mobile. It was working but I had to remove the css. It was screwing up my all my ul lists. Any help would greatly appreciated Here is the code for the button at the bottom of the form : <div class="next"> <a class="btnNext">Next &gt;&gt;</a> </div> Which is supposed to do this on a separate js file: init: function(){ $('.btnNext').onclick(function(){ if ($('input[type=radio]:checked:visible').length == 0) { return false; } $(this).parents('.questionContainer').fadeOut(500, function(){ Here is the css I removed: a { border: 1px solid #000; padding: 2px 5px; font-weight: bold; font-size: 10px; background: #FFF; cursor: pointer; } a:hover { background: none; }

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• Google Adword not working /conversion.js not found

  - by Jed

  I'm currently working on a wordpress site. My task is just to add the conversion script in a thankyou page. I added the script here: http://www.livingedge.co.nz/thanks-for-getting-in-touch/ , unfortunately does not work. It says that a conversion.js was not found. See the attached screenshot: http://screencast.com/t/52ixQUzHKNxZ I added the conversion script on the footer put it in a conditional so that it will load only on the thakyoupage. I'm new to this and can't figure out what would be the possible cause of such problem. I tried adding the script in the header, on the page editor, on a form redirect. Q: What could be the possible cause of this issue?

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• add .js file as source in html file from server

  - by zeeshan

  I have an HTML file on my server, and a Javascript file on the same server. I want it so that when I load the HTML file, it will the reference of .js file placed on the server. I tried this way: <html> <head> <script type="text/javascript src="...server side path...."></script> </head> </html> but it is not working. Can any one tell me how I can do this?

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• Why is this js code so slow?

  - by SpiderPig

  This code takes 3 seconds on Chrome and 6s on Firefox. If I write the code in Java and run it under Java 7.0 it takes only 10ms. Chrome's JS engine is usually very fast. Why is it so slow here? btw. this code is just for testing. I know it's not very practical way to write a fibonacci function fib = function(n) { if (n < 2) { return n; } else { return fib(n - 1) + fib(n - 2); } }; console.log(fib(32));

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• The ABC of Front End Web Development

  - by Geertjan

  And here it is, the long awaited "ABC" of front end web development, in which the items I never knew existed until I was looking to fill the gaps link off to the sites where more info can be found on them. A is for Android and AngularJS B is for Backbone.js and Bower C is for CSS and Cordova D is for Docker E is for Ember.js and Ext JS F is for Frisby.js G is for Grunt H is for HTML I is for Ionic and iPhone J is for JavaScript, Jasmine, and JSON K is for Knockout.js and Karma L is for LESS M is for Mocha N is for NetBeans and Node.js O is for "Oh no, my JS app is unmaintainable!" P is for PHP, Protractor, and PhoneGap Q is for Queen.js R is for Request.js S is for SASS, Selenium, and Sublime T is for TestFairy U is for Umbrella V is for Vaadin W is for WebStorm X is for XML Y is for Yeoman Z is for Zebra

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• Photobooth.js : le framework JavaScript permet d'ajouter un système de webcam à un site Web en utilisant HTML5

  Photobooth.js : le framework JavaScript permet d'ajouter un système de webcam à un site Web en utilisant HTML5 Le HTML5, le futur standard du Web vient de révéler une fois de plus l'une de ses nombreuses facettes. Un développeur indépendant a exploité les nouveautés du langage pour mettre au point Photobooth.js, une bibliothèque open source en JavaScript qui permet d'intégrer dans un site Web assez aisément un système de prise de photo par webcam. Photobooth s'appuie sur la méthode getUserMedia du framework audio et vidéo open source WebRTC, qui est actuellement en cours de standardisation par le W3C comme une partie du HTML5. Photobooth.js permet de prendre dire...

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• Microsoft sort en open source NPM.NET, une bibliothèque qui facilite la gestion des modules Node.js dans une application

  Microsoft sort en open source NPM.NET une bibliothèque qui facilite la gestion des modules Node.js dans une application Bonne nouvelle pour les développeurs Node.js qui éprouvent des difficultés pour gérer les différents modules qui sont utilisés dans leurs applications reposant sur la librairie serveur JavaScript. Microsoft vient de publier en open source NPM.NET, une bibliothèque .NET pour le gestionnaire de modules Node.js (NPM). NPM.NET a été développé à la base pour être utilisé dans une extension pour WebMatrix 2, l'environnement de développement Web gratuit de Microsoft tout-en-un. La bibliothèque permet à l'EDI de disposer d'une interface graphique sous fo...

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• Previously working emberjs1.0-pre form on jsfiddle returns "error": "Please use POST request"

  - by brg

  This code ** http://jsfiddle.net/wagenet/ACzaJ/8/ ** was working a few days ago, when i returned to it today, it throws {"error": "Please use POST request"}, when i click add button Also the jsfiddle editor.js always throws exception on this line: function stop(){cc = stop; throw StopIteration;}; Does anyone knows the cause of this issue. Many thanks Update 1 Based on @Peter Wagenet's suggestions below, the form now logs entries or inputs to the console but it doesn't display on the result section of jsfiddle instead what is displayed on jsfiddle result section or page is still this error {"error": "Please use POST request"} ** http://jsfiddle.net/ACzaJ/18/ Update 2 In this fiddle, http://jsfiddle.net/ACzaJ/19/, i have successfully eliminated this error {"error": "Please use POST request"} by adding event.preventDefault(); to the submit action in Todos.TodoFormView. That allows us to use arbitrary view methods as action handlers. The existing issue is that the input to the form, only displays on the console and not on jsfiddle result section, though no error displays on the result section, there is a new error appearing in the console of the updated fiddle: Uncaught Error: Cannot perform operations on a Metamorph that is not in the DOM. Finally solved I needed to comment out App.initialize() for it to work as expected. This the working fiddle ** http://jsfiddle.net/ACzaJ/20/. I don't know why that is so, but my guess is that, App.initialize works with other parts like the router for routing, ApplicationController and ApplicationView with {{outlet}} in the handlebars, which i didn't need for this fiddle. Finally Finally and completely solved This ** http://jsfiddle.net/tQWn8/ works with App.initialize. But you have to declare all those components above and pass the router to App.initialize, like this App..initialize(router). If you don't do this, then you will get the old error Uncaught Error: Cannot perform operations on a Metamorph that is not in the DOM.

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• Ext JS Tab Panel - Dynamic Tabs - Tab Exists Not Working

  - by Joey Ezekiel

  Hi Would appreciate if somebody could help me on this. I have a Tree Panel whose nodes when clicked load a tab into a tab panel. The tabs are loading alright, but my problem is duplication. I need to check if a tab exists before adding it to the tab panel. I cant seem to have this resolved and it is eating my brains. This is pretty simple and I have checked stackoverflow and the EXT JS Forums for solutions but they dont seem to work for me or I'm being blind. This is my code for the tree: var opstree = new Ext.tree.TreePanel({ renderTo: 'opstree', border:false, width: 250, height: 'auto', useArrows: false, animate: true, autoScroll: true, dataUrl: 'libs/tree-data.json', root: { nodeType: 'async', text: 'Tool Actions' }, listeners: { render: function() { this.getRootNode().expand(); } } }) opstree.on('click', function(n){ var sn = this.selModel.selNode || {}; // selNode is null on initial selection renderPage(n.id); }); function renderPage(tabId) { var TabPanel = Ext.getCmp('content-tab-panel'); var tab = TabPanel.getItem(tabId); //Ext.MessageBox.alert('TabGet',tab); if(tab){ TabPanel.setActiveTab(tabId); } else{ TabPanel.add({ title: tabId, html: 'Tab Body ' + (tabId) + '', closable:true }).show(); TabPanel.doLayout(); } } }); and this is the code for the Tab Panel new Ext.TabPanel({ id:'content-tab-panel', region: 'center', deferredRender: false, enableTabScroll:true, activeTab: 0, items: [{ contentEl: 'about', title: 'About the Billing Ops Application', closable: true, autoScroll: true, margins: '0 0 0 0' },{ contentEl: 'welcomescreen', title: 'PBRT Application Home', closable: false, autoScroll: true, margins: '0 0 0 0' }] }) Can somebody please help?

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• JS: variable inheritance in anonymous functions - scope

  - by tkSimon

  hey guys, someone from doctype sent me here. long story short: var o="before"; x = function() //this needs to be an anonymous function { alert(o); //the variable "o" is from the parent scope }; o="after"; //this chages "o" in the anonymous function x(); //this results in in alert("after"); //which is not the way i want/need it in reality my code is somewhat more complex. my script iterates through many html objects and adds an event listener each element. i do this by declaring an anonymous function for each element and call another function with an ID as argument. that ID is represented by the "o"-variable in this example. after some thinking i understand why it is the way it is, but is there a way to get js to evaluate o as i declare the anonymous function without dealing with the id attribute and fetching my ID from there? my full source code is here: http://pastebin.com/GMieerdw the anonymous function is on line 303

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• Simple first-child js?

  - by Glister

  Searching for a simple first-child detection via javascript (no framework). It should add some class for the first child of the element. Like a css-hacks for ie, but in javascript and for a html file. Must work similar to :first-child When I say no framework, I mean some code like this: <script type="text/javascript">document.documentElement.id = "js"</script> For example: <div class="terms"> <dl> <dt>Term 1 name</dt> <dd>Term 1 description</dd> </dl> <dl> <dt>Term 2 name</dt> <dd>Term 2 description</dd> </dl> <dl> <dt>Term 3 name</dt> <dd>Term 3 description</dd> </dl> </div> Three <dl>, the first one includes Term 1. This css won't work in IE6, thats why I'm searching for a javascript solution. CSS-hacks are not allowed. .terms dl:first-child { float: right; }

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• moment.js work out time left

  - by user1503606

  I am trying to get my head around the moment.js library as it seems more stable than the jquery one and the jquery date one is output console errors. http://momentjs.com/docs/#/manipulating/ What i am trying to do is do a countdown to work out the time left from now. example i have var countDownTill = '2012-11-19 00:00:00 +0000'; document.write(moment(countDownTill).diff(moment(), 'months') + " months<br>"); document.write(moment(countDownTill).diff(moment(), 'weeks') + " weeks<br>"); document.write(moment(countDownTill).diff(moment(), 'days') + " days<br>"); which will output 0 months 1 weeks 4 days but its not working out overall its doing it individuals for each value (days,weeks,months) so if i up the date by say 12 months like below. var countDownTill = '2013-11-19 00:00:00 +0000'; document.write(moment(countDownTill).diff(moment(), 'months') + " months<br>"); document.write(moment(countDownTill).diff(moment(), 'weeks') + " weeks<br>"); document.write(moment(countDownTill).diff(moment(), 'days') + " days<br>"); it outputs. 12 months 53 weeks 369 days where as i am trying to get it to output 12 months 2 weeks 5 days example here http://jsfiddle.net/fDmWH/3/

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• [JS] getSelection on DIV contentEditable

  - by cactoos

  Hi all ! I am trying to achieve project and i must do a WYSIWYG editor in JavaScript. I can't use an existing editor because I need use my plugins (for example a colorPicker or imagePicker).. For this time I have this HTML : <div class="K_editor" id="idExample"> <div class="K_links"> <div class="K_editor_link K_editor_linkBold">B</div> <div class="K_editor_link K_editor_linkItalic">I</div> <div class="K_editor_link K_editor_linkUnderline">U</div> </div> <iframe width="696" height="212" frameborder="0" src="js/myEditor_iFrame.php"> <html> <head/> <body> <div id="contentIframe" contenteditable="true"> This is a test code, with <strong>bold</strong> text and <em>italic</em> text. </div> </body> </html> </iframe> <input type="submit"/> </div> On event click on ".K_editor_link", a function is open with arguments : - tagStart (exemple '', or '') - tagEnd (exemple '', or '') - id (here 'idExample') I know get a Selection on Textarea but "setSelectionRange()", ".selectionStart" and ".selectionEnd" are only for textbox (XUL), input (XHTML) or textarea (XHTML). Why can I do for do that ?? I'm realy block.. Thank all ! CactO_o's

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• Raphael JS image animation performance.

  - by michael

  Hi, I'm trying to create an image animation using Raphael JS. I want the effect of a bee moving randomly across the page, I've got a working example but it's a bit "jittery", and I'm getting this warning in the console: "Resource interpreted as image but transferred with MIME type text/html" I'm not sure if the warning is causing the "jittery" movement or its just the way I approached it using maths. If anyone has a better way to create the effect, or improvements please let me know. I have a demo online here and heres my javascript code: function random(min, max) { return Math.floor(Math.random() * (max - min + 1)) + min; } function BEE(x, y, scale) { this.x = x; this.y = y; this.s = scale; this.paper = Raphael("head", 915, 250); this.draw = function() { this.paper.clear(); this.paper.image("bee.png", this.x, this.y, 159*this.s, 217*this.s); } this.update = function() { var deg = random(-25, 25); var newX = Math.cos(Raphael.rad(deg)) * 2; var newY = Math.sin(Raphael.rad(deg)) * 2; this.x += newX; this.y += newY; if( this.x > 915) { this.x = 0; } if( this.y > 250 || this.y < 0 ) { this.y = 125; } } } $(document).ready(function() { var bee = new BEE(100, 150, 0.4); var timer = setInterval(function(){ bee.draw(); bee.update(); }, 15); }

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• Automatic multi-page multi-column flowing text with QtWebkit (HTML/CSS/JS -> PDF)

  - by Peter Boughton

  I have some HTML documents that are converted to PDF, using software that renders using QtWebkit (not sure which version). Currently, the documents have specific tags to split into columns and pages - so whenever the wording changes, it is a manual time-consuming process to move these tags so that the columns and pages fit. Can anyone provide a way to have text auto-wrapped into the next column/page (as appropriate) when it reaches the bottom of the current container? Any HTML, CSS or JS supported by QtWebkit is ok (assuming it works in the PDF converter). (I have tested the webkit-column-* in CSS3 and it appears QtWebkit does not support this.) To make things more exciting, it also needs to: - put a header at the top of each page, with page X of Y numbering; - if an odd number of pages, add a blank page at the end (with no header); - have the ability to say "don't break inside this block" or "don't break after this header" I have put some quick example initial markup and target markup to help explain what I'm trying to do. (The actual documents are far more complicated than that, but I need a simple proof-of-concept before I attack the real ones.) Any suggestions? Update: I've got a partially working solution using Aaron's "filling up" suggestion - I'll post more details in a bit.

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• Shadowbox.js and dailymotion videos

  - by Greenie

  Hi there. I have a site set up with some thumbs and links to videos hosted on vimeo. I show them in a overlay using shadowbox.js. This works perfect. Now I want to add a video hosted on dailymotion, but it doesn't work. The working link to vimeo video: <a rel="shadowbox;height=636;width=956" href="http://vimeo.com/moogaloop.swf?clip_id=11377863&server=vimeo.com&show_title=1&show_byline=1&show_portrait=1&color=00ADEF&fullscreen=1" class="player_text">thumbnail here</a> The non working link to dailymotion video: <a rel="shadowbox;height=636;width=956" href="http://www.dailymotion.com/swf/xd6g8y?related=0&autoplay=1" class="player_text">thumbnail here</a> When the href is pasted in a browser, both links work fine. Both are played in a swf as far as I can see. So I can't see why shadowbox won't show it. Unless its a permission problem on the dailymotion video. Anyone know what I'm doing wrong?

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