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  • Sanitizing user input before adding it to the DOM in Javascript

    - by I GIVE TERRIBLE ADVICE
    I'm writing the JS for a chat application I'm working on in my free time, and I need to have HTML identifiers that change according to user submitted data. This is usually something conceptually shaky enough that I would not even attempt it, but I don't see myself having much of a choice this time. What I need to do then is to escape the HTML id to make sure it won't allow for XSS or breaking HTML. Here's the code: var user_id = escape(id) var txt = '<div class="chut">'+ '<div class="log" id="chut_'+user_id+'"></div>'+ '<textarea id="chut_'+user_id+'_msg"></textarea>'+ '<label for="chut_'+user_id+'_to">To:</label>'+ '<input type="text" id="chut_'+user_id+'_to" value='+user_id+' readonly="readonly" />'+ '<input type="submit" id="chut_'+user_id+'_send" value="Message"/>'+ '</div>'; What would be the best way to escape id to avoid any kind of problem mentioned above? As you can see, right now I'm using the built-in escape() function, but I'm not sure of how good this is supposed to be compared to other alternatives. I'm mostly used to sanitizing input before it goes in a text node, not an id itself.

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  • javascript function pointer and "this"

    - by Justin808
    I'm passing a method as a variable to be used as a callback. When its called, the "this" is not the object the method is a member of. How do I go about getting access to the method's object instance so I can get access to it variables and other member functions? I have no control over the callback call method, its a separate library. All I do is call the binding from my object init method. I would have expected this inside my _connection method to have been its object. jsPlumb.bind('connection', this._connection);

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  • Javascript this points to Window object

    - by terrani
    Hi, I have the following code. I expected to see "archive" object on my firebug console, but I see Window object. Is it normal? var archive = function(){} archive.prototype.action = { test: function(callback){ callback(); }, test2: function(){ console.log(this); } } var oArchive = new archive(); oArchive.action.test(oArchive.action.test2);

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  • javascript : make a new safe class constructor

    - by guilin ??
    sometimes we loss the new keyword when define new object, obj = new Clazz(); //correct obj = Clazz(); //wrong, but no syntax error, hard to debug. I want to write a function to help me create Class and make it new safe. var Class = function(constructor){ //when constructor // if not call by new return new constructor(); // else constructor(); } var MyClazz = Class(function(name){ this.name = name }, SuperClazz1, SuperClass2 ) MyClazz.extend({ show: function(){console.log(this.name)} }) obj1 = new MyClazz(); obj2 = MyClazz(); // obj1 should same as obj2 Is it possible, any exists module?

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  • javascript var declaration within loop

    - by Trouts
    hello, /*Test scope problem*/ for(var i=1; i<3; i++){ //declare variables var no = i; //verify no alert('setting '+no); //timeout to recheck setTimeout(function(){ alert('test '+no); }, 500); } it alerts "setting 1" and "setting 2" as expected, but after the timeout it outputs "test 2" twice - for some reason the variable "no" is not reset after the first loop... i've found only an "ugly" workaround... /*Test scope problem*/ var func=function(no){ //verify no alert('setting '+no); //timeout to recheck setTimeout(function(){ alert('test '+no); }, 500); } for(var i=1; i<3; i++){ func(i); } Any ideas on how to workaround this problem in a more direct way? or is this the only way?

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  • Problem with Firefox, javascript, and Canvas

    - by Rob
    I'm having a Firefox-specific issue with a script I wrote to create 3d layouts. The correct behavior is that the script pulls the background-color from an element and then uses that color to draw on the canvas. When a user mouses over a link and the background-color changes to the :hover rule, the color being drawn changes on the canvas changes as well. When the user mouses out, the color should revert back to non-hover color. This works as expected in Webkit browsers and Opera, but Firefox chokes on it if mouseout is triggered and no mouseover event follows it. This is easier to see than for me to describe, and it's too much code to post here, so here is a link: http://www.robnixondesigns.com/strangematter/

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  • Javascript is freezing the browser when running this code

    - by user1420493
    I am trying to get the value of a text input and check if there is any links in it and then take those links and make them into tags. But when I run this code, something is going wrong and it completely freezes the page. Basically, I want it to check for "http://" and if that exists, to keep on adding to the substr length until the end of the string/link. Is there a better way to do this? // the id "post" could possibly say: "Hey, check this out! http://facebook.com" // I'd like it to just get that link and that's all I need help with, just to get the // value of that entire string/link. var x = document.getElementById("post"); var m = x.value.indexOf("http://"); var a = 0; var q = m; if (m != -1) { while (x.value.substr(q, 1) != " ") { var h = x.value.substr(m, a); q++; } }

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  • Javascript adding two numbers incorrectly

    - by Scott
    Global.alert("base: " + base + ", upfront: " + upfront + ", both: " + (base + upfront)); This code above outputs this: base: 15000, upfront: 36, both: 1500036 Why is it joining the two numbers instead of adding them up? I eventually want to set the value of another field to this amount using this: mainPanel.feesPanel.initialLoanAmount.setValue(Ext.util.Format.number((base + upfront), '$0,000.00')); ...and when I try that now it turns the number into the millions instead of 15,036.00. I have no idea why. Any ideas?

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  • javascript / jQuery variable problem (possibly caching issue)

    - by waitinforatrain
    Standard AJAX query with jQuery: var globalTitle = ""; var pages = ["a", "b", "c"]; for (var i = 0; i < pages.length; i++) { createpage(pages[i]); } function createpage(title) { globalTitle=title; console.log (globalTitle); //All looks good here $.ajax({ url: "createpage.php?id=" + title, context: document.body, success: success }); } The success() function uses globaltitle which is why I had to declare it global. In the success() function though console.log (globalTitle); constantly gives me "a". It's like the variable is assigned but is then cached every time success() is called. Happens in FF 4 and Chrome 8. Any thoughts?

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  • Web Application Architecture (ASP.NET 3.5,JavaScript)

    - by Niv
    hey all , background - I'm using an activx that allow me to access some information on the client side, By using the activex events and callback i'm updating server side from client. i wrote a user control that register all activex's events so when one of the events occuer there is a callback to the server that handle this event. I need to write some other user controls based on this control so on every callback this user controls will be render on the client side. My question is - what is the best way to make a shared infrastructure that handle this events and render the right content base on user controls? is there any other ways i can use ? thanks!

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  • asp.net-mvc: javascript caching

    - by Omu
    I'm thinking whether it makes sense in order to increase the speed of the website to do some strategy of caching the js files that are being included ? one idea that I have is to do something like this: [OutputCache(Location = OutputCacheLocation.Any, Duration = 3600)] public JsController : Controller public ActionResult JQuery() { //I would have a ascx with the entire jquery script inside return View(); } and on the site.master: <%=Html.RenderAction("JQuery","JsController");

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  • Javascript jQuery ajax submit default data

    - by onlineracoon
    How to submit default data when using $.ajax? I have tried: $.ajaxPrefilter(function(options, originalOptions, jqXHR) { // can't access anything here... (tried jqXHR.data but undefined) }); $.ajaxSetup({ beforeSend: function(jqXHR, settings) { // can't access anything here... (tried jqXHR.data but undefined) } }); I need this so I can send my CSRF token, each time and when logged in submit the user ID each time. I prefer not to submit a token in headers. Thanks

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  • Javascript serialization

    - by John
    Have I any chance to serialize meta (any format, so I can store it in DB)? var obj1 = {}; var obj2 = {}; obj1.link = obj2; obj2.link = obj1; var meta = [obj1, obj2]; As I understand the problem is that JSON serialize object`s links to objects.

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  • javascript Refresh Div.

    - by Tom
    Hi, I am using this code to refresh the data inside of the div: <script> $(function() { $("#refresh").click(function() { $("#new").load("/new.php") }) }) </script> Except it loads the who page inside of the div, instead of just the information that is inside of the div. How do I make it refresh only the data that is inside of the div? Is there a way of doing it other than putting the information for that div in a seperate page?

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  • javascript url parsing

    - by Ra
    Hi, I have a url like http://mywebsite.com/folder1/folder2/index how to parse this above url and get all the values separately? I want the output like http, mywebsite.com, folder1, folder2, index Thanks in adavance

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  • Sending mail using Javascript

    - by user146780
    Here's what I'm trying to do. I want to use Java Script to send an email. I have created a form with a subject text field, a message field, and a send button. I want for when the person clicks Send that it sends the email, but I want to avoid server side scripting. Thanks

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  • Javascript: adding methods using prototype descriptor

    - by LDK
    Sorter.prototype.init_bubblesort = function(){ console.log(this.rect_array); this.end = this.rect_array.length; this.bubblesort(); } Sorter.prototype.init = function(array,sort_type){ this.rect_array = array; this.init_bubblesort(); } The code above works as expected, but when I change the init function to: Sorter.prototype.init = function(array,sort_type){ var sort_types = {'bubblesort':this.init_bubblesort, 'quicksort':this.init_quicksort, 'liamsort':this.init_liamsort}; this.rect_array = array; sort_types[sort_type](); } the init_bubblesort function results in an error saying this.rect_array is undefined. I'm trying to wrap my head around why init_bubblesort no longer as access to it's instance's variables.

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