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  • Javascript: Passing large objects or strings between function considered a bad practice

    - by Mr. Smee
    Is it considered a bad practice to pass around a large string or object (lets say from an ajax response) between functions? Would it be beneficial in any way save the response in a variable and keep reusing that variable? So in the code it would be something like this: var response; $.post(url, function(resp){ response = resp; }) function doSomething() { // do something with the response here } vs $.post(url, function(resp){ doSomething(resp); }) function doSomething(resp) { // do something with the resp here } Assume resp is a large object or string and it can be passed around between multiple functions.

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  • How to load file into javascript

    - by misha-moroshko
    I have an HTML table that should be updated according the file that user uploads. In other words, I would like user to be able to upload a file, and change the contents of the table according to file content. The file size can be several MB. What are my options ? Do I must to upload the file to a server, or it can be done in client side ? Thanks !

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  • Continuing JavaScript "classes" - enums within

    - by espais
    From a previous question, I have the following: So I have implemented a resource class, now I'd like to continue extending it and add all my constants and enums (or as far as JS will allow...). This is what I currently have: var resources = { // images player : new c_resource("res/player.png"), enemies : new c_resource("res/enemies.png"), tilemap : new c_resource("res/tilemap.png") }; And this is what I would like to continue to extend it to: var resources = { // images player : new c_resource("res/player.png"), enemies : new c_resource("res/enemies.png"), tilemap : new c_resource("res/tilemap.png"), // enums directions : {up:0, right:1, down:2, left:3}, speeds : {slow: 1, medium: 3, fast: 5} }; ... function enemies() { this.dir = resources.directions.down; // initialize to down } When I attempt to access resources.directions.up, my JS script goes down in a flaming pile of burning code. Are enums allowed in this context, and if not, how can I properly insert them to be used outside of a normal function? I have also tried defining them as global to a similar effect. edits: fixed the comma...that was just an error in transcribing it. When I run it in Firefox and watch the console, I get an error that says resources is undefined. The resources 'class' is defined at the top of my script, and function enemies() directly follows...so from what I understand it should still be in scope...

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  • Using eval() in Javascript to unpack the array

    - by gnomixa
    I have an array that I need to unpack. So, from something like var params = new Array(); params.push("var1"); params.push("var2"); I need to have something like "var1", "var2". I tried using eval, but eval() gives me something like var1, var2...i don't want to insert quotes myself as the vars passed can be integers, or other types. I need to pass this to a function, so that's why i can't just traverse the array and shove it into a string. What is the preferred solution here?

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  • Visual Studio 2010: Publish minified javascript files instead of the original ones

    - by salgiza
    I have a Scripts folder, that includes all the .js files used in the project. Using the Ajax Minifier task, I generate .min.js files for each one. Depending on whether the application is running in debug or release mode, I include the original .js file, or the minified one. The Scripts folder looks like this: Scripts/script1.js Scripts/script1.min.js // Outside the project, generated automatically on build Scripts/script2.js Scripts/script2.min.js // Outside the project, generated automatically on build The .min.js files are outside the project (although in the same folder as the original files), and they are not copied into the destination folder when we publish the project. I have no experience whatsoever using build tasks (well, apart from including the minifier task), so I would appreciate if anyone could advise me as to which would be the correct way to: Copy the .min.js files to the destination folder when I publish the app from Visual Studio. Delete / Not copy the original js files (this is not vital, but I'd rather not copy files that will not be used in the app). Thanks,

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  • How much does Javascript garbage collection affect performance?

    - by Long Ouyang
    I'm writing a bunch of scripts that present images serially (e.g. 1 per second) and require the user to make either a keyboard or mouse response. I'm using closures to handle the timing of image presentation and user input. This causes garbage collection to happen pretty frequently and I'm wondering if that will affect the performance (viz. timing of image presentation).

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  • javascript - rollover effect on overlapping transparent images

    - by user427969
    I want to add rollover effect on overlapping transparent images. For example: The following image is divided into 5 parts and I want to add rollover effect (different image) on each of them When O tried with div or img tag, the image is rendered as a rectangle so rollover effect is not proper. When i rollover on green part between yellow, the yellow image gets highlighted because its z-index is high. Following is the code that I tried: <body> <br /> <img src="part1.png" onclick="console.log('test1');"/> <img src="part2.png" onclick="console.log('test2');" style="position:absolute; left:30px; top: 19px;"/> <img src="part3.png" onclick="console.log('test3');" style="position:absolute; left:70px; top: 15px;"/> <img src="part4.png" onclick="console.log('test4');" style="position:absolute; left:95px; top: 16px;"/> <img src="part5.png" onclick="console.log('test5');" style="position:absolute; left:123px; top: 24px;"/> </body> images = , , , , I don't want to use jQuery, if possible.

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  • Get a CSS value from external style sheet with Javascript/jQuery

    - by Acorn
    Is it possible to get a value from the external CSS of a page if the element that the style refers to has not been generated yet? (the element is to be generated dynamically). The jQuery method I've seen is $('element').css('property','value');, but this relies on element being on the page. Is there a way of finding out what the property is set to within the CSS rather than the computed style of an element? Will I have to do something ugly like add a hidden copy of the element to my page so that I can access its style attributes?

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  • Memory release from local variable in javascript

    - by Bob
    Quick question. I have a js function which gets called on the page every few seconds. It's an ajax update thing. Being a function, I declare local variables. I don't want to use closures or global variables for various reasons. I'd never considered this, but do I need to release/clear the variables at the end of the function to release memory or will js do this for me automatically ? Thanks

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  • javascript to determine if page on remote domain has changed

    - by uku
    Hi, I am trying to find a client-side way to determine if a page on a remote domain has changed. I can't load the page in an iframe and examine its contents due to same origin policy. So I tried using .getResponseHeader("Content-Length") and .getResponseHeader("Last-Modified") but apparently these are also restricted by SOP even though FireBug shows Content-Length in the console. Is there a way to do this? I just need a way to know if the page has changed. Thx

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  • ScriptManager duplicates javascript

    - by Andreas
    Hi! I have a usercontrol that can be used in for example a gridview itemtemplate, this means that the control might or might not be on the page at page load. In the case where the control is inside an itemtemplate i will popupate the gridview via asyncronous postbacks (via updatepanels). The control itselfs registrers scriptblocks since it is depending on javascripts. First i used Page.ClientScript.RegistrerClientScriptBlock But this doesn't work on asyncronous postbacks (updatepanels) so i then tried the same using ScriptManager which allows me to registrer scripts on the page after async postbacks. great!. ScriptManager.RegisterClientScriptBlock However, ScriptManager (what i know of) does not have the functionallity to see if a script already is on the page, so i will for every postback generate duplicates of the script blocks, this is ofcourse unwanted behaviour. I did a run at Google and found that i can call the Dispose() method of the PageRequestManager can be used, this does work since it clears the scripts and then adding them again (this also solves my issue with removing unused script blocks from removed controls). Sys.WebForms.PageRequestManager.getInstance().Dispose() However, ofcourse there is a downside since im posting here :). The Dispose() method disposes the instance on the master page as well which leads to scripts running there will stop to function after an async postback (updateprogress for example). So, is there a way to check if a script already exists on the page using ScriptManager or any other tools, that will prevent me of inserting duplicate scripts? Also, is there a way to remove certain script blocks (when i am removing an item in itemtemplate for example). Big thanks in advance.

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  • Javascript Prototype Best Practice Event Handlers

    - by nahum
    Hi this question is more a consulting of best practice, Sometimes when I'm building a complete ajax application I usually add elements dynamically for example. When you'r adding a list of items, I do something like: var template = new Template("<li id='list#{id}'>#{value}</li>"); var arrayTemplate = []; arrayOfItem.each(function(item, index){ arrayTemplate.push(template.evaluate( id : index, value : item)) }); after this two options add the list via "update" or "insert" ----- $("elementToUpdate").update("<ul>" + arrayTemplate.join("") + "</ul">); the question is how can I add the event handler without repeat the process of read the array, this is because if you try add a Event before the update or insert you will get an Error because the element isn't still on the DOM. so what I'm doing by now is after insert or update: arrayOfItem.each(function(item, index){ $("list" + index).observe("click", function(){ alert("I see the world"); }) }); so the question is exist a better way to doing this??????

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  • javascript call a privileged method

    - by quan
    If I call the killSwitch() outside the onkeypress, I'll cause an error. But inside the onkeypress function, I worked just fine. Why? // this works fine var ClassA = function() { var doc = document; // killSwitch(); doc.onkeypress = function(e){ killSwitch(); } this.killSwitch = function(){ alert('hello world'); } } var myClass = new ClassA();

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  • What's wrong in my JavaScript code?

    - by DarkLightA
    I can't figure out what's wrong. var CarObj = function(passengers, maxLoad, wheels, doors, maxSpeed) { this.passengers = passengers; this.maxLoad = maxLoad; this.wheels = wheels; this.doors = doors; this.maxSpeed = maxSpeed; }; var ferrari = new CarObj(4, "700kg", 4, 2, "360km/h"); var output = new Array(); for (var i = 0; i < ferrari.length; i++) { for (var a in ferrari) { output[i] = a; } } document.getElementById('ELEMENTHERE').innerHTML = (output.join(" "));

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  • Switch statement for string matching in JavaScript

    - by yaya3
    How do I write a swtich for the following conditional? If the url contains "foo", then settings.base_url is "bar". The following is achieving the effect required but I've a feeling this would be more manageable in a switch: var doc_location = document.location.href; var url_strip = new RegExp("http:\/\/.*\/"); var base_url = url_strip.exec(doc_location) var base_url_string = base_url[0]; //BASE URL CASES // LOCAL if (base_url_string.indexOf('xxx.local') > -1) { settings = { "base_url" : "http://xxx.local/" }; } // DEV if (base_url_string.indexOf('xxx.dev.yyy.com') > -1) { settings = { "base_url" : "http://xxx.dev.yyy.com/xxx/" }; } Thanks

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  • Clever "add tag" javascript help needed

    - by Camran
    I have this function for adding options to a Select list: function addOption(selectbox, value, text, cl ) { var optn = document.createElement("OPTION"); optn.text = text; optn.value = value; if (cl==1){ optn.className = "nav_option_main"; } selectbox.options.add(optn); } I have just discovered the "optgroup" tag, but I don't know how to implement it to the drop list. The function above is called on another selectboxes "OnChange" event, to fill sub-select-box with the desired options. I don't think it should be too difficult to add the "optgroup" tag into this, or is it? Thanks and if you need more input let me know...

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  • Javascript and VERY LONG string

    - by StealthRT
    Hey all, i am having problems with the below code: function showTableData() { var tableArray; var x = 0; var theHTML; for (i = 0; i < 7032; i++) { if (x = 0) { theHTML = '<tr>' + '<th scope="row" class="spec">' + partNum[i] + '</th>' + '<td>' + Msrp[i] + '</td>' + '<td>' + blah[i] + '</td>' + '<td>' + blahs[i] + '</td>' + '</tr>' + theHTML; x++; }else{ theHTML = '<tr>' + '<th scope="row" class="specalt">' + partNum[i] + '</th>' + '<td class="alt">' + Msrp[i] + '</td>' + '<td class="alt">' + blah[i] + '</td>' + '<td class="alt">' + blahs[i] + '</td>' + '</tr>' + theHTML; x--; } } theHTML = '<table id="mytable" cellspacing="0">' + '<tr>' + '<th scope="col" abbr="Configurations" class="nobg">Part Number</th>' + '<th scope="col" abbr="Dual 1.8">Msrp Price</th>' + '<th scope="col" abbr="Dual 2">blahs Price</th>' + '<th scope="col" abbr="Dual 2.5">Low Price</th>' + '</tr>' + theHTML + '</table>'; $('#example').append(theHTML); } </script> <div id="example"> </div> The problem being that the $('#example').append(theHTML); never executes (or shows on the page). I think its because the string is soooooo long! It has over 7,000 items in the array so im not sure if thats the reason or if its something else? Any help would be great! Thanks! David

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  • javascript switch using internals

    - by Fernando SBS
    Can I use intervals in a switch statement? Like switch (parseInt(troops[i])) { case <10: editbox.style.fontSize = "13px"; break; case <100: editbox.style.fontSize = "12px"; break; case <1000: editbox.style.fontSize = "8px"; editbox.size = 3; //editbox.style.width = "18px"; break; default: editbox.style.fontSize = "10px"; } ???

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  • View list of all JavaScript variables in Google Chrome Console

    - by GRboss
    Hello everyone. In Firebug the DOM tab shows a list of all your public variables and objects. In Chrome's console you have to type the name of the public variable or object you want to explore. Is there a way - or at least a command - for Chrome's console to display a list all the public variables and objects? It will save a lot of typing. Thank you all Stefanos

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  • Sorting a list of items using javascript

    - by Nicholas
    Hi all, I am working on a class assignment in which i need to accomplish the following: 1 User types a list of items into a text box (form field) 2 When the user presses the sort button, the list in the text box is sorted 3 It takes the text from the text box and puts the sorted text back in the text box Please help!

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