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• Websockify to wrap a forking server

  - by Gurjeet Singh

  I came across Websockify [1] and the accompanying Websock client-side javascript library. AIUI from the Wrap a Programsection in README, Websockify can help you launch a TCP server and rebind its port so that incoming Websockets-based communication is parsed and forwarded to the server on the proper (rebinded) port. My question is, can this mechanism be used to wrap a server that forks its children which in turn communicate with the client on a different port. Specifically, I am interested in websockifying a Postgres server, which typically listens on port 5432 and for a new incoming connection it forks a child which serves all future request from that client. (If it helps, Oracle RDBMS and many other servers, RDBMS or not, also use similar method.) [1] https://github.com/kanaka/websockify

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• I've Heard Global Variables Are Bad, What Alternative Solution Should I Use?

  - by Jay

  I've read all over the place that global variables are bad and alternatives should be used. In Javascript specifically, what solution should I choose. I'm thinking of a function, that when fed two arguments (function globalVariables(Variable,Value)) looks if Variable exists in a local array and if it does set it's value to Value, else, Variable and Value are appended. If the function is called without arguments (function globalVariables()) it returns the array. Perhaps if the function is fired with just one argument (function globalVariables(Variable)) it returns the value of Variable in the array. What do you think? I'd like to hear your alternative solutions and arguments for using global variables.

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• Gantt Chart online

  - by Luca

  I need to insert a horizontal bar chart in a web page. The thing I have to do is very similar to a Gantt Chart. I'd like to use a javascript library for the purpose. I tried jsgantt, but actually it is not very beautiful. I could evaluate also a server generation of the graph. In case my server side language is Python. It will be part of an internal project with no internet access, so Google Charts isn't an option.

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• silverlight 3.0 communication with winforms

  - by abusemind

  I would like to create a winform on the client side for interaction with Silverlight 3.0. The basic idea is using the winform browser. I definitely need both the directions of communication. Would it be impossible by using JavaScript as a midware for the interaction or some better ways? Or is there any new features of Silverlight 3.0 supported for this kind of winform application communication? The original one is one the client's browser to run but now I would like to migrate it to the winform application. For the sake of time-saving, please don't mention about the WPF because of the gap between WPF and the Silverlight.

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• Hot to trigger saved password autofill in browsers?

  - by Aleksander Kmetec

  I have a web application written in pure JavaScript (no pre-generated HTML except for the document which loads all the JS files). This app contains a login form which is created dynamically when the document.ready event event is triggered. I trick the browser into displaying the "Remember password?" dialog by posting the login form into a hidden iframe before logging in using ajax (in Firefox the password appears on the saved password list, so this part obviously works) but saved passwords never get filled in after the login screen is loaded again at a later time. The same thing happens in Firefox and Safari. Is there something I can do or some function I can call to trigger autofill?

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• Using recursion to find paths in a 2D array

  - by rikkit

  Hi, I'm working on a project for my A level. It involves finding the maximum flow of a network, and I'm using javascript. I have a 2D array, with values in the array representing a distance between the two points. An example of the array: 0 2 2 0 0 0 1 2 0 0 0 2 0 0 0 0 I think I need to use a recursive technique to find a path; below is some pseudocode, assuming that the array is 4x4. a is (0,0), b is (3,3). function search(a,b) from a to b if element(i,j) != 0 then store value of element search(j,3) I was wondering if that was the right construction for a depth first search. Thanks for any help.

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• Are Cross Domain Flash Shared Objects (LSO aka Flash Cookie) possible

  - by user85155

  Hi, I found several solutions for creating Flash LSOs from JavaScript (for example: http://www.nuff-respec.com/technology/cross-browser-cookies-with-flash ) If Page (www.hostA.com/index.html) and the .swf file are from the same site, everything works fine. No I'm trying to load the page form www.hostA.com/index.html, which includes www.hostB.com/flashcookie.swf (different sites). But then I cannot read or store the LSO. I have tried several configurations (crossdomain.xml, Security.allowDomain("...") ), but nothing works. Is this kind of cross domain access to a LSO possible? Thanks -stephan

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• Convert an HTML form field to a JSON object with inner objects.

  - by Tawani

  Given the following HTML form: <form id="myform"> Company: <input type="text" name="Company" value="ACME, INC."/> First Name: <input type="text" name="Contact.FirstName" value="Daffy"/> Last Name: <input type="text" name="Contact.LastName" value="Duck"/> </form> What is the best way serialize this form in javascript to a JSON object in the format: { Company:"ACME, INC.", Contact:{FirstName:"Daffy", LastName:"Duck"} } Also note that there might be more than 1 "." sign in the field name.

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• How do I call window.openDatabase from a webView hosted in an android application?

  - by Kevin

  I created a native Android app that basically hosts a webView control. That webView is then used to load a page that calls window.openDatabase from JavaScript. I can successfully confirm that the API exists by verifying window.openDatabase. Calling this method returns a null when called in a hosted webView control. Calling the same method in the Android Browser returns an instance of the database. Does anyone know the permessions in the manifest or settings on the webView control that need to be set to access the database? Is this even possible in a native app.

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• Firefox throwing a exception with HTML Canvas putImageData

  - by mr.doob

  So I was working on this little javascript experiment and I needed a widget to track the FPS of it. I ported a widget I've been using with Actionscript 3 to Javascript and it seems to be working fine with Chrome/Safari but on Firefox is throwing an exception. This is the experiment: Depth of Field This is the error: [Exception... "An invalid or illegal string was specified" code: "12" nsresult: "0x8053000c (NS_ERROR_DOM_SYNTAX_ERR)" location: "http://mrdoob.com/projects/chromeexperiments/depth_of_field__debug/js/net/hires/debug/Stats.js Line: 105"] The line that is complaning about is this one: graph.putImageData(graphData, 1, 0, 0, 0, 69, 50); Which is a crappy code to "scroll" the bitmap pixels. The idea is that I only draw a few pixels on the left of the bitmap and then on the next frame I copy the whole bitmap and paste it on pixel to the right. This error usually is thrown because you're pasting a bitmap bigger than the source and it's going off the limits, but in theory that shouldn't be the case as I'm defining 69 as the width of the rectangle to paste (being the bitmap 70px wide). And this is full code: var Stats = { baseFps: null, timer: null, timerStart: null, timerLast: null, fps: null, ms: null, container: null, fpsText: null, msText: null, memText: null, memMaxText: null, graph: null, graphData: null, init: function(userfps) { baseFps = userfps; timer = 0; timerStart = new Date() - 0; timerLast = 0; fps = 0; ms = 0; container = document.createElement("div"); container.style.fontFamily = 'Arial'; container.style.fontSize = '10px'; container.style.backgroundColor = '#000033'; container.style.width = '70px'; container.style.paddingTop = '2px'; fpsText = document.createElement("div"); fpsText.style.color = '#ffff00'; fpsText.style.marginLeft = '3px'; fpsText.style.marginBottom = '-3px'; fpsText.innerHTML = "FPS:"; container.appendChild(fpsText); msText = document.createElement("div"); msText.style.color = '#00ff00'; msText.style.marginLeft = '3px'; msText.style.marginBottom = '-3px'; msText.innerHTML = "MS:"; container.appendChild(msText); memText = document.createElement("div"); memText.style.color = '#00ffff'; memText.style.marginLeft = '3px'; memText.style.marginBottom = '-3px'; memText.innerHTML = "MEM:"; container.appendChild(memText); memMaxText = document.createElement("div"); memMaxText.style.color = '#ff0070'; memMaxText.style.marginLeft = '3px'; memMaxText.style.marginBottom = '3px'; memMaxText.innerHTML = "MAX:"; container.appendChild(memMaxText); var canvas = document.createElement("canvas"); canvas.width = 70; canvas.height = 50; container.appendChild(canvas); graph = canvas.getContext("2d"); graph.fillStyle = '#000033'; graph.fillRect(0, 0, canvas.width, canvas.height ); graphData = graph.getImageData(0, 0, canvas.width, canvas.height); setInterval(this.update, 1000/baseFps); return container; }, update: function() { timer = new Date() - timerStart; if ((timer - 1000) > timerLast) { fpsText.innerHTML = "FPS: " + fps + " / " + baseFps; timerLast = timer; graph.putImageData(graphData, 1, 0, 0, 0, 69, 50); graph.fillRect(0,0,1,50); graphData = graph.getImageData(0, 0, 70, 50); var index = ( Math.floor(Math.min(50, (fps / baseFps) * 50)) * 280 /* 70 * 4 */ ); graphData.data[index] = graphData.data[index + 1] = 256; index = ( Math.floor(Math.min(50, 50 - (timer - ms) * .5)) * 280 /* 70 * 4 */ ); graphData.data[index + 1] = 256; graph.putImageData (graphData, 0, 0); fps = 0; } ++fps; msText.innerHTML = "MS: " + (timer - ms); ms = timer; } } Any ideas? Thanks in advance.

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• How to split a string by ',' or '[|]' unless the ',' is in '{}'

  - by floyddotnet

  i search for a regex to split the following string: aaa[bbb,ccc[ddd,{eee:1,mmm:999}],nnn[0,3]] aaa[bbb,ccc[ddd,{eee:1, mmm:[123,555]}],nnn[0,3]] aaa[bbb, ccc[ddd, ddd],nnn[0,3]] aaa[bbb,ddd[0,3]] by '[' or ']' or ',' unless the ',' is in '{}'. As example: split 'aaa[bbb,ccc[ddd,' to aaa, bbb, ccc, ddd is allow but not {eee:1,mmm:999}. the result: aaa, bbb, ccc, ddd, {eee:1,mmm:999}, nnn, 0, 3 aaa, bbb, ccc, ddd, {eee:1, mmm:[123,555]}], nnn, 0, 3 aaa, bbb, ccc, ddd, ddd, nnn, 0, 3 aaa, bbb, ddd, 0, 3 i have read meany other questions but i cant modifie the regex's there are post to do this what i want. the target language for the expression is javascript.

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• DHTML library for handling pictures and their caches

  - by Cawas

  This is based on my full question. I decided to take it in parts and see if I still can't get any help. What are all the options we've got for client-side javascript graphical frameworks? I'm not even sure how to call this. Would it be just DHTML? Maybe Ajax? Well, I've heard mostly about prototype and jquery, but I know there are way too many options out there beyond those two. From all of them which one is the fastest for dealing with images? What are the advantages it has over the others?

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• Stack Overflow-like tag selector for Rails

  - by David Tildon

  I want to use tags for a model in my Rails application, and I'd like to have the same kind of tag selection mechanism that Stack Overflow has when asking a question. I.e. I type in 'rails' and it drops down a list of tags that include 'rails', and I can go on to add more tags from there. Is there a plugin that can do this? I'm comfortable putting together the tag model and migrations myself, that isn't an issue. I just need something to handle the AJAX and javascript. I'm using prototype and Rails 2.3.

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• Do not fetch app.manifest each time

  - by Kristof

  For creating an offline version of a bunch of linked web pages I use an app.manifest-file that lists all the web pages for offline caching. I would like it that the app.manifest file is not fetched every time when a user jumps from one web page to another. Most of the web pages will never be updated once the application is on the iPhone. Also the target audience is abroad so roaming costs could add up while users are using my "web app". Searching the internet made me think in the direction of forcing an offline mode in Mobile Safari using Javascript but I don't know if this is the right way to go or if it is even possible. Does anyone have any other and/or better ideas and suggestions on how to do this?

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• Jquery: Preload an image on request with a callback function?

  - by tarnfeld

  Hey, I'm helping out a friend with a website he's developing and we are having trouble with preloading images on request. Basically, when the user clicks on a thumbnail of the product a <div> slides down that includes a scrolling carrousel of large images. In total there are about 20MB of images that could be loaded in (if you did them all) so preloading them on the page load would not be an option. Is there a way that we could call a javascript function that begins to preload about 4 images and then when it's done it has a callback function? Thanks! P.S. We are using jQuery on the page...

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• Using jQuery to listen for an AJAX load that is not loaded using jQuery.AJAX

  - by rich

  Okay, have a bit of a tricky one (for me anyway, i'm pretty rubbish at jQuery/JavaScript). I'm pulling in data using standard AJAX (ie, NOT using a framework like jQuery or whatnot... there is a reason for it) However, I then need to load up a jQuery script as soon as the page has been loaded in. So, here is the question, how do I bind the script once the DOM has been updated? I have been using Ariel Fleser's listen plugin (http://flesler.blogspot.com/2007/10/jquerylisten.html) for picking up on events such as clicks which works a treat, but I can't see how this can be used to listen for a load event. Any ideas? I'm pretty stumped on this one!!

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• Embedding Facebook Connect In A Facebook Page

  - by Russell C.

  Our site allows users to register using Facebook Connect. We also have a Facebook page. We'd like to include the "Connect with Facebook" button in our page so a user could instantly connect (aka register) and then be forwarded on to their account on our site. I was hoping to use the Static FBML page application and the FBML iFrame tag to simply embed the button but it looks like the iFrame tag isn't allowed in Facebook pages. Facebook Connect uses JavaScript so I'm wondering if there is some kind of trick I could use like popping up a page in a new window that would automatically display the connect dialog box. Any ideas on how I would include a Facebook Connect button on our Facebook page would awesome! Thanks in advance for your help.

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• Listen for keypress while iframe has focus?

  - by Matrym

  Is there any way to listen for keypress events in a parent page while the iframe has focus? Or, alternatively, is it possible to pull away the focus from the iframe? Please note, the iframe is not within the same domain, so I cannot modify it's contents via javascript. I've tried the following jquery in the parent page, thinking perhaps an intermittent blur would work, but it doesn't seem to. function iframeBlur(){ $("#iframe").blur(); } var blurif = setInterval(iframeBlur, 500); Thanks for your time!

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• Use ModalPopupExtender without having to set TargetControlID?

  - by Monty

  I'd like to use a modalpopupextender in my asp.net page to show a sub form. But it only has to show on specific conditions. Those conditions are determined in a piece of javascript code. So, most importantly, the modal popup doesn't have to show on a button click. However, if I leave the property TargetControlID empty I get the following exception: The TargetControlID of 'ModalPopupExtender1' is not valid. The value cannot be null or empty. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.InvalidOperationException: The TargetControlID of 'ModalPopupExtender1' is not valid. The value cannot be null or empty. Do I just have the TargetControlID to an hidden button or is there aslo a more decent option? Thanks.

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• Error "window" is not defined when loading Protovis from javax.script?

  - by Shane

  I am loading Protovis using javax.script: ScriptEngineManager factory = new ScriptEngineManager(); ScriptEngine engine = factory.getEngineByName(scriptEngine); engine.eval(new java.io.FileReader("protovis-d3.1.js")); But I get the following exception: Exception in thread "main" javax.script.ScriptException: sun.org.mozilla.javascr ipt.internal.EcmaError: ReferenceError: "window" is not defined. (<Unknown sourc e>#5033) in <Unknown source> at line number 5033 at com.sun.script.javascript.RhinoScriptEngine.eval(Unknown Source) at javax.script.AbstractScriptEngine.eval(Unknown Source) at RJScript.EvalScript(RJScript.java:20) at RJScript.main(RJScript.java:26) This same script runs from a browser. Do I need to do something so that the "window" is defined?

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• Use jQuery to find div by background color

  - by maxsilver

  I'm trying to use jQuery to find the number of divs that are both visible, and have a background color of Green. (Normally I'd just add a class to the div, style it green, and check for that class in jQuery but in this instance, I can't actually change the markup of the page itself in any way) I currently have the visible div part working as : if( // if there are more than one visible div $('div.progressContainer:visible').length > 0 ){ I'd like to throw some kind of "and background color is green" selector in there. // not legit javascript if( // if there are more than one visible div, and its color is green $('div.progressContainer:visible[background-color:green]').length > 0 ){ Is it possible to do this?

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• Howto: Download local copy of Google's Pacman game

  - by macek

  It looks like this is HTML+JavaScript. Is there a way I can download a copy so I can continue playing after they take it down? Thanks for any help :) Edit Ok, ok, I wasn't completely forthcoming. Not only would I like to continue playing it, I kinda want to look at the source code, too... I was able to find this: Google pacman10-hp.2.js See it reformatted on Github here. Thanks @SteD Github repo I setup a github repo: macek/google_pacman. Check out the README, I think we're very close! Send me pull request if you make any progress. Put any useful details in the README. Let's get this working! :)

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• Does setting an onload event for a <script> tag work consistently in modern browsers?

  - by Matchu

  I observe that placing the following in an external script file has the desired effect in my copies of Firefox and Google Chrome: var s = document.createElement('script'); s.setAttribute('type', 'text/javascript'); s.setAttribute('src', 'http://www.example.com/external_script.js'); s.onload = function () { doSomethingNowThatExternalScriptHasLoaded } document.getElementsByTagName('body')[0].appendChild(s); It adds a an external script tag to them DOM, and attaches a function to the tag for when the script has loaded. I'm having trouble testing in Internet Explorer right now, but I'm not sure if it's related to that addition in particular, or something else. Does this method work in the more modern versions of other browsers, including IE7/8? If not, how else could I go about this?

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• jQuery.each for lists and non-lists

  - by Brian M. Hunt

  I've a jQuery.each(data, foo), where data is either a string or a list of strings. I'd like to know if there's an existing utility function to convert the string to a list, or otherwise perform foo on just the string. So instead of the easy route: if (!$.isArray(data)) { foo(0, data); // can't rely on `this` variable } else { $.each(data,foo); } I was just wondering if there was already a builtin function of jQuery or Javascript that would convert data to a list automatically, like this: function convert_to_list(data) { return $.isArray(data) ? data : [data]; } $.each(convert_to_list(data), foo); Just curious! Thanks for reading. Brian

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• Are Cross Domain Flash Local Shared Objects (LSO aka Flash Cookie) possible

  - by user85155

  Hi, I found several solutions for creating Flash LSOs from JavaScript (for example: http://www.nuff-respec.com/technology/cross-browser-cookies-with-flash ) If Page (www.hostA.com/index.html) and the .swf file are from the same site, everything works fine. No I'm trying to load the page form www.hostA.com/index.html, which includes www.hostB.com/flashcookie.swf (different sites). But then I cannot read or store the LSO. I have tried several configurations (crossdomain.xml, Security.allowDomain("...") ), but nothing works. Is this kind of cross domain access to a LSO possible? Thanks -stephan

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