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  • Common Javascript mistakes that severely affect performance?

    - by melee
    At a recent UI/UX MeetUp that I attended, I gave some feedback on a website that used Javascript (jQuery) for its interaction and UI - it was fairly simple animations and manipulation, but the performance on a decent computer was horrific. It actually reminded me of a lot of sites/programs that I've seen with the same issue, where certain actions just absolutely destroy performance. It is mostly in (or at least more noticeable in) situations where Javascript is almost serving as a Flash replacement. This is in stark contrast to some of the webapps that I have used that have far more Javascript and functionality but run very smoothly (COGNOS by IBM is one I can think of off the top of my head). I'd love to know some of the common issues that aren't considered when developing JS that will kill the performance of the site.

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  • Differences between C# and Javascript for Unity [closed]

    - by vrinek
    Apart from the language differences (class-based vs prototypical, strong vs weak typing), what are the differences between using Javascript and using C# when developing games in Unity3D? Is there a noticable performance difference? Is the javascript code packaged as-is? And if yes, does this help the game's modability? Is it possible to use libraries developed for one language while developing in the other one? Is it possible to mix the two languages in the same Unity project by coding some parts in C# and others in Javascript? The next couple of questions are time-specific so feel free to ignore or remove: If libraries are not cross-functional, which language has better library support from the game development perspective? Which language has better game dev specific resources available (books, websites, forums)?

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  • Cannot add DataTables.net javascript into Joomla 1.5

    - by mfmz
    I've been having this problem where i couldn't add Datatables.net javascript into my Joomla article. I have been trying to include it through Jumi. To say that my editor strips of the tag is somewhat not right as I have been able to execute Google Chart API in Joomla which also uses javascript. Any clue why? The code is as below : <link href="//datatables.net/download/build/nightly/jquery.dataTables.css" rel="stylesheet" type="text/css" /> <script src="http://code.jquery.com/jquery-1.9.1.min.js"></script> <script src="//datatables.net/download/build/nightly/jquery.dataTables.js"></script> <script type="text/javascript"> $(document).ready( function () { var table = $('#example').DataTable(); } ); </script>

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  • Is obtrusive JavaScript ever ok?

    - by Petah
    I was thinking that if all the users of a website are required to have JavaScript enabled, Is it ok to use obtrusive JavaScript? I'm all for progressive enhancement, but whats the point when an advanced web applications bounces users at the door if they have an old browser or JavaScript disabled? We have a very slim target audience, and we can tell our target audience what browser and plugins/functionality they are required to have. So you my question is, is mixing JS and HTML alright in that case. Like using onclick attributes.

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  • Does heavy JavaScript use adversely impact Googleability?

    - by A T
    I've been developing the client-side for my web-app in JavaScript. The JavaScript can communicate with my server over REST (HTTP)[JSON, XML, CSV] or RPC (XML, JSON). I'm writing writing this decoupled client in order to use the same code for both my main website and my PhoneGap mobile apps. However recently I've been worrying that writing the website with almost no static content would prevent search-engines (like Google) from indexing my web-page. I was taught about this restriction about 4 years ago, which is why I'm asking here, to see if this restriction is still in-place. Does heavy JavaScript use adversely impact Googleability?

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  • Why make JavaScript class based?

    - by Carnotaurus
    JavaScript is a prototype language. To turn it into a class based language adds little value? I am not talking about best-practice here. I remember reading an article from way back, which claimed that the class-based worldview is perceivably more flawed than the one of prototypes. My summary can be found here: http://carnotaurus.tumblr.com/post/3248631891/class-based-javascript-or-not. I am resisting to use the class-based jQuery add-on and other attempts at faciliating class-based JavaScript. Peer pressure is strong but is there a stronger theoretical or practical reason why I stop resisting?

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  • How do you unit test your javascript

    - by Erin
    I spend a lot of time working in javascript of late. I have not found a way that seems to work well for testing javascript. This in the past hasn't been a problem for me since most of the websites I worked on had very little javascript in them. I now have a new website that makes extensive use of jQuery I would like to build unit tests for most of the system. My problems are this. Most of the functions make changes to the DOM in some way. Most of the functions request data from the web server as well and require a session on the service to get results back. I would like to run the test from either a command line or a test running harness rather then in a browser. Any help or articles I should be reading would be helpful.

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  • Can desktop applications be written using javascript?

    - by jase21
    Is it currently possible to write desktop applications using javascript, html, css? Possible solutions: Use Adobe AIR runtime and program in js. But no, if I'm using AIR, the AS3 suites it the most. So not a good option. GWT: No because it uses Java and then convert it to js or what ever. Pyjamas: Interesting. But I'm currently focusing on JavaScript. So I don't want to use python and cross-compile to js. Run a local server and use the browser in full screen mode. Sort of okay, but still its the same browser thing. And difficult to distribute. So what is the best option? I'm excited about node.js which is the main reason for looking into JavaScript. Otherwise I would have choose python.

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  • pop up html as javascript string instead of hidden div for seo [closed]

    - by user1324762
    Possible Duplicate: How bad is it to use display: none in CSS? I have heard that using display:none or visibility:hidden css properties are not a very good idea for seo purposes. I have about 4 different pop up windows to display and each one has about 20 words inside it. I can create hidden divs. Another option is to store div html elements as javascript string. In this way pop up html elements will be generated from javascript string. This will be still faster than using ajax since the data is static. Is this method absolutely safe for SEO? P.S.: I was just asking about similar question on http://stackoverflow.com/questions/12389075/storing-data-in-javascript-array-for-further-use, but this one is different, it is about static data and about SEO.

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  • How to run/test JavaScript? [closed]

    - by user702
    I'm reading David Flanagan's "JavaScript: The Definitive Guide, 6th ed". It only actually tells users how to run JS code on page 311, where users are told of the following solutions: "Client-side JavaScript code is embedded within HTML documents in four ways: Inline, between a pair of <script> and </script> tags From an external file specified by the src attribute in a <script> tag In an HTML event handler attribute, such as onclick or onmouseover In a URL that uses the special javascript: protocol." I was wondering what professional JS developers use to write and test their code: Do they use a good text editor with syntax high-lighting + autocompletion, hit F5 in the browser to reload the page every time they make a change, and use some add-on in the browser to investigate errors? Or are there full-fledged IDE's similar to MS VisualStudio for non-web languages?

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  • How do I know that I'm good at JavaScript

    - by lKashef
    I'm an ASP.NET developer and I won't get any job because of my JavaScript skills. I started reading about JavaScript in articles and tutorials but I still didn't pick a book to read. But what I'm trying to understand. For example If you want to test your ASP.NET skills you firstly start learning the basics from a book, course, etc. And to increase my knowledge and experience, I would build a website of any given idea and start to face troubles and learn as I go. but what can I do with JavaScript! .. how am I supposed to know how good I am at it !? First Things First: I'm sorry guys, I've been facing some troubles to Comment or UpVote on the website but It's finally over, so Thanks everybody for your help =)

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  • Javascript Dropdownbox

    - by edgar
    I have a dropdownbox (percent), a input box(price) and a input box (total) When you select a percent from the dropdown, it multiplies the value of the selected dropdown times the price value and input the result in the total input box. This works well with one input box, but what I am trying to do is to use asp and when you select a percent from the drop down box, it will calcualate the rest of the total fields. Here is the code that I have so far <%@LANGUAGE="VBSCRIPT" CODEPAGE="1252"% <% Dim Recordset1 Dim Recordset1_numRows Set Recordset1 = Server.CreateObject("ADODB.Recordset") Recordset1.ActiveConnection = MM_pricdsn_STRING Recordset1.Source = "SELECT * FROM AMFLIB.MBCWCPP where cwfvnb = 1090101 and cwaitx between '0025' and '0025AT'" Recordset1.CursorType = 0 Recordset1.CursorLocation = 2 Recordset1.LockType = 1 Recordset1.Open() Recordset1_numRows = 0 %> <% Dim Repeat1__numRows Dim Repeat1__index Repeat1__numRows = -1 Repeat1__index = 0 Recordset1_numRows = Recordset1_numRows + Repeat1__numRows %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> Javascript Untitled Document <script type="text/javascript"> function startCalc4(){ interval = setInterval("calc4()",1); } function calc4(){ one = document.form1.prcbook.value; two = document.form1.percent.value; document.form1.total.value = (one * 1) * (two * 1); } function stopCalc4(){ clearInterval(interval); } </script> <style type="text/css"> <!-- #Layer1 { position:absolute; left:26px; top:49px; width:150px; height:24px; z-index:1; } #Layer2 { position:absolute; left:36px; top:22px; width:166px; height:22px; z-index:2; } #Layer3 { position:absolute; left:19px; top:24px; width:174px; height:21px; z-index:3; } --> </style> <script type="text/javascript"> function showhideText(box,id) { var elm = document.getElementById(id) elm.style.display = box.checked? "inline":"none" } </script> </head> <body> <form id="form1" name="form1" method="post" action=""> <p> </p> <p>&nbsp;</p> <p> <input type="text" name="itm" value="<%=(Recordset1.Fields.Item("CWAITX").Value)%>"/> <select name="percent" onFocus="startCalc4();"onBlur="stopCalc4();"> <option value="0">select</option> <option value="1.10">10%</option> <option value="1.25">25%</option> </select> </p> <p> <% If Not REcordset1.EOF Then Do while not REcordset1.EOF %> <input type="text" name="qty" value="<%=(Recordset1.Fields.Item("CWAJQT").Value)%>"onfocus="startCalc4();" onblur="stopCalc4();"/> <input name="prcbook" type="text" value="<%=(Recordset1.Fields.Item("CWKDVA").Value)%>"onfocus="startCalc4();" onblur="stopCalc4();"/> <input type="text" name="total" value=""/> </p> </form> </body> </html> <% REcordset1.MoveNext Loop End If %>

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  • computationally expensive flash blocking javascript events

    - by jedierikb
    When I have a computationally expensive flash animation running in my page, sometimes javascript keyUp listeners on a textfield are not being fired. Keydown events are not lost. This only happens in IE8 (and IE7 in compatibility mode). I need those keyup listeners! How can I solve / workaround this problem? Ideas: query the textfield myself (without the broken listener) if the key is down or up? can I do this?

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  • Clear/Remove JavaScript Event Handler

    - by Jordan Terrell
    Greetings all - Given the following HTML fragment: <form id="aspnetForm" onsubmit="alert('On Submit Run!'); return true;"> I need to remove/clear the handler for the onsubmit event and register my own using jQuery or any other flavor of JavaScript usage. Anyone know how to do this? Thanks - Jordan

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  • JavaScript on the server-side like PHP

    - by Nathan Campos
    I'm now thinking to establish my server-side code in JavaScript, and begin to do all on it, but I want to know about its security and flexibility compared to PHP. I want to know too, if it can be successfully used to develop things like forum boards, full web-sites and things like this, as PHP does.

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  • remove element in javascript

    - by Hulk
    In the below code how to remove the hyperlink after getting the innerHTML function test(obj) { var a=obj.innerHTML // remove obj element here } $p = $('<a id="name" onclick="javascript:var ele=test(this);">').html( "test" ); $('#questions').append( $p ); Thanks..

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  • Image viewport with zoom in Javascript

    - by pakore
    I want to display a huge image inside a viewport in a html page. I would like to be able to drag and drop the image to move it inside the viewport, like in Google Maps. Any library where I can find such component? Thanks in advance

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  • While Mouse press event. Prototype JS or Javascript

    - by nahum
    Hi, I would like to know if someone knows how to make a function repeat over and over while the mouse is press, I don't know how to make it work. I know in prototype you can take events like $('id').observe("click",function(event){}) $('id').observe("leave",function(event){}) $('id').observe("change",function(event){}) //etc... but is something like $('id').observe("whilemousepress",function(event){}) :P //I know there is not any event in javascript but I would like to emulate. thanks...

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  • Calling javascript class within other Js

    - by harigm
    I have Aptana plugin in eclipse, I have a javascript (one.js) and i have included one more Javscript(two.js) within one.js. I click on any functions within one.js and if those functions exists in the same one.js, the control is going to the respective function. Suppose if the function exists in two.js, the control is not going to two.js Can any one help me with this?

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