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  • Get real image width and height with Javascript in Safari/Chrome?

    - by Frank Bannister
    I am creating a jQuery plugin. How do I get real image width and height with Javascript in Safari? Following works with Firefox 3, IE7 and Opera 9: var pic = $("img") // need to remove these in of case img-element has set width and height pic.removeAttr("width"); pic.removeAttr("height"); var pic_real_width = pic.width(); var pic_real_height = pic.height(); But in Webkit browsers like Safari and Google Chrome values are 0... Doing this on server side is not an option.

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  • How to determine position (x,y) relative to the page of every character inside spans through javascript?

    - by Fernando
    This is as simple as I can get. I will have several spans randomly positioned on the screen through something like: $(".hidden:first").css('-webkit-transform','rotate('+((0.5-Math.random())*40)+'deg)'); $(".hidden:first").animate({ left: '+=' + (((screen.width-800-224)/2) + Math.random()*800), top: '+=' + (50+Math.random()*600) } [...] and later on I would like to iterate through every char of every of those elements (that are randomly position and have random rotation), and I would need to discover the (x,y) position of every character on the screen so I can colorize it, forming certain draws according to certain functions. Is this easily achievable? I am really inexperienced at javascript. Thanks. Fernando.

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  • What is the JavaScript variable scope in a switch / case statment?

    - by Todd Moses
    While creating JavaScript with ASP.NET MVC I noticed several scope warnings and realized that I am missing something with understanding the variable scope inside the switch / case statement. Warning: 'i' is already defined referring to case b and case c My code looks similar to this: switch(element) { case 'a': for(var i=0; i < count; i++){ do something } break; case 'b': for(var i=0; i < count; i++){ do something } break; case 'c': for(var i=0; i < count; i++){ do something } break; } I thought scope ended with each break statement but it seems that scope does not end until the end of the switch/case. Is scope for the entire switch/case?

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  • Do Any Client-Side JavaScript Frameworks Integrate Well With Node.js+Express.js+socket.io.js?

    - by Tom D
    I'm building an webapp using Node.js+Express.js+socket.io.js on the backend. Do any of the popular front-end frameworks (Agility, Angular, Backbone, Closure, Dojo, Ember, GWT, jQuery, Knockback, Knockout, Spine, YUI, etc) integrate well with this backend for "real-time" applications? I want my application to have a very "real-time" feel. Specifically, when a user submits a form I want the information to be sent using web sockets to the backend for validation and (if validation passes) to be updated in the database. Then, the server-side will use web sockets to send a confirmation that the data was saved or some list of errors. I will use the server's response to update the page using JavaScript. I know all this can be done with any of the listed frameworks. I'm interested in features of particular frameworks that will help the framework integrate better with the Node-based backend than the other frameworks.

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  • Internet Explorer to Firefox javascript migration library - does one exist?

    - by Brad
    I am working on a legacy ASP.NET web site that is highly dependent on Internet Explorer. I would like to migrate it to non-IE browsers. I know there are a large amount of differences (as detailed at quirksmode.org, etc.), so I'm searching for a javascript library that can help minimize the amount of source I'd have to change. I'm hoping that my lack of success in finding such a beast so far means that I'm just a bad google-er, and not that I'm just going to have to slog through coming up with replacements/workarounds for all of IE's proprietary functionality that this site currently uses (it uses quite a bit). Any help you can provide will be greatly appreciated. Thanks!

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  • How do I select an item out of a JavaScript array when I only know a value for one of the item's pro

    - by minus4
    I have the following JavaScript object: { "DPI": "66.8213457076566", "width": "563.341067", "editable": "True", "pricecat": "6", "numpages": "2", "height": "400", "page": [{ "filename": "999_9_1.jpg", "line": [{ "test": "test 1", lineid: 22 }, { "test": "test 2", lineid: 22 }, { "test": "test 3", lineid: 22 }, { "test": "test 4", lineid: 22 }, { "test": "blank", lineid: 22 }] }, { "filename": "999_9_2.jpg", "line": [] }] } I can do most things with lines like measurements.page[0].line[0].lineid; But what I am really stuck with is when I want to edit a specific line but I only have the lineid value available (for example 22) and not the line number in the array: measurements.page[0].line[WHAT DO I PUT HERE].test = "new changed value";

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  • How can I call a method on a custom object created in JavaScript using C#?

    - by just in case
    I have a WebBrowser control. I have added some JavaScript into the head tag and I can see it is working as expected by adding an alert. Inside of this js I am creating a function and adding some members to it's prototype like so: function test() { } test.prototype.run = function() { alert('success!') } function createTest() { return new test() } Then back inside of C# I am doing: dynamic test = this.browser.InvokeScript("createTest"); test.run(); I can see that the test object is some ComObject but when I call run() nothing happens. I get no error but nothing happens. Does anyone know how to call this type of custom object? Also suppose I wanted to get rid of the createTest() method, how can I create a new instance of test from C#? Also, for bonus points, is there anything special I need to know about attaching events to this custom object (on say a 'complete' member) such that it will callback into my C# code?

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  • Is it possible to take a screenshot of a web page with Javascript or HTML5/Canvas?

    - by Ryan Kearney
    Is there a way I could insert some code into a page that would take a screenshot of what the user sees in the browser window, then upload that image via a web form of some sort? I'm working on a clone of a pay-to-use service that lets you install a widget on a web page which in turn allows viewers to report bugs in the sites layout. Currently they use a Java applet to take the screenshot, which, in my opinion, is probably the worst way to go about it (aside from requiring the user to install a plugin) Is there a javascript/flash/other alternative? Thanks

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  • javascript on twitter to prevent embedding the html page.

    - by Reginald
    This is the javascript that you can find in www.twitter.com (just click to see the source code) I have just reformatted it for clarity: if (window.top !== window.self) { document.write = ""; window.top.location = window.self.location; setTimeout(function() { document.body.innerHTML = ''; }, 1); window.self.onload = function(evt) { document.body.innerHTML = ''; }; } now I understand this trick is to prevent other sites to wrap twitter in other iframes. but what I want to ask is do we really need all of this code ? what's the need of setting a function to execute in 1 millisecond, one to execute at 'onload' and one now. is that paranoia or is it really worth ? Many THanks in advance Reg

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  • Possible to use Javascript to get data from other sites?

    - by Xavier
    Is it possible for a web page using Javascript to get data from another website? In my case I want to get it for calculations and graphing a chart. But I'm not sure if this is possible or not due to security concerns. If it is considered a no no but there is a work around I would appreciate being told the work around. I don't want to have to gather this information on the server side if possible. Any and all help is appreciated.

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  • When Does the File Download Dialog Open? - HTML, Javascript

    - by sahs-i-muhterem
    Hello, I have a html page, and when I click a file link on the page, the file download dialog pops up, and this file dialog locks the page. I mean without selecting one of the choices(Open, Save, Cancel) I can't do anything on the page (which is normal). What I need is if javascript can check whether the page is locked or not. (or whether the file dialog is popped?) p.s. don't say "put an onclick event to the link", because the server may respond very slowly (like 30 seconds after clicking)

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  • On site load, how do you wrap all images in a link dynamically using Javascript?

    - by akaii
    I have barely any experience working with DOM and using Javascript, and I have a very specific task that I'm trying to accomplish. Let's say I have an image in my HTML: <img src="foo.jpg" /> When the site loads, I want to take that image (all images in the document, actually), and wrap them in a link: <a href="http://www.foobar.com"><img src="foo.jpg" /></a> What could I use to accomplish this? Google hasn't turned up much for me with regards to this specific task. On load, I can access and iterate all the images in the document... but I'm not sure where to go from there in order to wrap the image in a link.

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  • How can I launch a system command via Javascript in Google Chrome?

    - by kvsn
    I want to execute a local program on my computer via Javascript in Chrome. In Firefox, it can be done as follows (after setting 'signed.applets.codebase_principal_support' to true in about:config): function run_cmd(cmd, args) { netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect"); var file = Components.classes["@mozilla.org/file/local;1"] .createInstance(Components.interfaces.nsILocalFile); file.initWithPath(cmd); var process = Components.classes["@mozilla.org/process/util;1"] .createInstance(Components.interfaces.nsIProcess); process.init(file); process.run(false, args, args.length); } What's the equivalent code for Chrome?

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  • What to use to create bar, line and pie charts with javascript compatible with all major browsers?

    - by marcgg
    I used to work with flot but it doesn't support pie charts so I'm forced to change. I just saw JS Charts, but their documentation is very obscure regarding cross browser compatibility (I need it to be IE6+ compliant :). Also this will be for commercial use, so I'd rather have something that I can use free of charge jQuery Google chart looks really nice and is well integrated with rails (the framework I'm using) but I'm not sure how good it is. So what do you guys use? What would you recommend keeping in mind that: It will be for commercial use (I can deal with a license, but I'd rather avoid that) It needs to be javascript (no svg, no flash please) It needs to be compatible with IE6+, FF, Chrome, Opera and Safari It needs to be pretty ^^ If it uses jQuery it's even better

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  • What is a good Very-High level UI framework for JavaScript?

    - by Robert Gould
    I need to write a temporary Web-based graphical front-end for a custom server system. In this case performance and scalability aren't issues, since at most 10 people may check the system simultaneously. Also it should be PHP or Python (server) & JavaScript (client) (can't use Flex or Silverlight for very specific non-programming related issues). So I know I could use YUI or jQuery, but was wondering if there is something even more high-level that would say allow me to write such a little project within a few hours of work, and get done with it. Basically I want to be as lazy as possible (this is throw-away code anyways) and get the job done in as little time as possible. Any suggestions?

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  • JavaScript or Qt way to update a select box value?

    - by Pirate for Profit
    So I have the following HTML and am trying to change which item is selected. <select name="coolselectbox"> <option value="default" selected="selected">---</option> <option value="something">Something</option> <option value="something-else">Something Else</option> </select> Here's what I've tried: QWebElement defaultOpt = this->page()->mainFrame()->findFirstElement("option[value=default]"); QWebelement somethingOpt = this->page()->mainFrame()->findFirstElement("option[value=something]"); defaultOpt.removeAttribute("selected"); somethingOpt.setAttribute("selected", "selected"); And then also: QWebElement selectBox = this->page()->mainFrame()->findFirstElement("select[name=coolselectbox]"); selectBox.setAttribute("value", "something-else"); However neither of these seems to get the job done. Does anyone know a Qt solution, or is there perhaps some JavaScript snippet I can run to do this?

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  • JavaScript: What is AJAX? What is jQuery?

    - by dcolumbus
    What exactly IS AJAX? Is there an official release? What exactly is jQuery? Is there an official release? From what I understand, these two "extensions" of JavaScript are just small scripts that enable extended functionality. But, what exactly are there? I mean, Adobe is a company that created Flash. If you want information about Flash, the official source is at Adobe. Is there an equivalent for AJAX and jQuery? I don't want to learn AJAX or jQuery form some shmo that doesn't know that correct syntax. I want to learn proper syntax and best practices.

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  • JavaScript: How can I delay running some JS code until ALL of my asynchronous JS files downloaded?

    - by Henryh
    UPDATE: I have the following code: <script type="text/javascript"> function addScript(url) { var script = document.createElement('script'); script.src = url; document.getElementsByTagName('head')[0].appendChild(script); } addScript('http://example.com/One.js'); addScript('http://example.com/Two.js'); addScript('http://example.com/Three.js'); addScript('http://example.com/Four.js'); ... // run code below this point once both Two.js & Three.js has been downloaded and excuted </script> How can I prevent code from executing until all required JS have been downloaded and executed? In my example above, those required files being Two.js and Three.js.

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  • What JavaScript framework to choose? JQuery+JQueryUI, Dojo or ExtJS?

    - by Ivan
    I am choosing a JavaScript Framework to master and use extensively in all my future projects (mostly working with relational DATA, web services via AJAX and implementing complex rich client UIs). Now I am choosing between JQuery+JQueryUI, Dojo and ExtJS. What should I choose? 1st priority is power and functionality, 2nd priority is beauty and maintainability of code and ease of use, 3rd priority is flexibility and modularity, 4th priority is speed and size. IE compatibility hardly matters, I'd like it to be modern, legacy-free and standard-conformant.

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  • align WMD editor's preview HTML with server-side HTML validation (e.g. no embedded javascript)

    - by Justin Grant
    There are many SO questions (e.g. here and here) about how to do server-side scrubbing of Markdown produced by the WMD editor to ensure the HTML generated doesn't contain malicious script, like this: <img onload="alert('haha');" src="http://www.google.com/intl/en_ALL/images/srpr/logo1w.png" /> This doesn't affect the WMD client's preview box. I doubt this is a big deal since if you're scrubbing the HTML on the server, an attacker can't save the bad HTML so no one else will be able to see it later and have their cookies stolen or sessions hijacked by the bad script. But it's still kinda odd to allow an attacker to run any script in the context of your site, and it's probably a bad idea to allow the client preview window to allow different HTML than your server will allow. StackOverflow has clearly plugged this hole. How did they do it? [NOTE: I already figured this out but it required some tricky javascript debugging, so I'm answering my own question here to help others who may want to do ths same thing]

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  • How do I implement something like pointers in javascript?

    - by Shaun
    I know that javascript doesn't have pointers in terms of a variable referring to a place in memory but what I have is a number of variables which are subject to change and dependent on each other. For example: Center (x,y) = (offsetLeft + width/scale , offsetTop + height/scale) As of now I have rewritten the equation in terms of each individual variable and after any changes I call the appropriate update function. For example: If scale changes, then then the center, height, and width stay the same. So I call updateoffset() { offsetLeft = centerx - width/scale; offsetTop = centery - height/scale; } Is this the easiest way to update each of these variables when any of them changes?

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  • How do you access byte level information in JavaScript?

    - by JustSmith
    The generally accepted answer is that you can't. However there is mounting evidence that this is not true based on the existence of projects that read in types of data that are not basic HTML types. Some projects that do this are the JavaScript version of ProtoBuf and Smokescreen. Smokescreen is a flash interpreter written in JS so if it is not possible to get at the bytes directly how are these projects working around this? The source to Smokescreen can be found here. I have looked it over but with JS not being my primary language right now the solution eludes me.

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  • How do I execute a page-defined JavaScript function from a Firefox extension?

    - by yuku
    Hi, I'm creating a Firefox extension for demo purposes. I to call a specific JavaScript function in the document from the extension. I wrote this in my HTML document (not inside extension, but a page that is loaded by Firefox): document.funcToBeCalled = function() { // function body }; Then, the extension will run this on some event: var document = Application.activeWindow.activeTab.document; document.funcToBeCalled(); However it raises an error saying that funcToBeCalled is not defined. Note: I could get an element on the document by calling document.getElementById(id);

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  • Is there any Prototype Javascript function similar to Jquery Live to trace dynamic dom elements?

    - by Wbdvlpr
    Hi Event.observe(window,"load",function() { $$(".elem_classs").findAll(function(node){ return node.getAttribute('title'); }).each(function(node){ new Tooltip(node,node.title); node.removeAttribute("title"); }); }); Using above method, I can retrieve all elements having ".elem_class" and apply some javascript functions on them. But I have a modal/popup box which has some elements also having ".elem_class" and these dont get in the scope of findAll/each as they are loaded into the dom thru ajax. How do I apply the same to dynamically loaded elements as well? I am using Prototype Library. (I have used JQuery's Live function which keeps track of all future elements, but need to achieve something similar using Prototype) Thanks.

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  • Get variable value from XML to JavaScript. Pure way.

    - by kalininew
    I have XML: <point> ... <longitude>34.123123</longitude> </point> <point> ... <longitude>11.12534534</longitude> </point> <point> ... <longitude>32.567653</longitude> </point> <point> ... <longitude>33.345345</longitude> </point> ... Task: get values of <longitude> in javascript (in variable). Which is purest way? It is possible to do it without XSLT (without making dummy elements)?

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