I have a constructor function which registers an event handler:    function MyConstructor(data, transport) {     this.data = data;     transport.on('data', function () {         alert(this.data);     }); }  // Mock transport object var tran...
I have a nested data structure containing objects and arrays. How can I extract the information, i.e. access a specific or multiple values (or keys)?  For example:  var data = {     code: 42,     items: [{         id: 1,         name: 'foo'...
Is there a plugin-less way of retrieving query string values via jQuery (or without)?   If so, how? If not, is there a plugin which can do so?...
I was writing code that does something that looks like:  function getStuffDone(param) {           | function getStuffDone(param) {     var d = Q.defer(); /* or $q.defer */ |     return new Promise(function(resolve, reject) {     // or = new $.Defer...
What is the scope of variables in javascript? Do they have the same scope inside as opposed to outside a function? Or does it even matter? Also, where are the variables stored if they are defined globally?...
Do getElementsByClassName (and similar functions like getElementsByTagName and querySelectorAll) work the same as getElementById or do they return an array of elements?  The reason I ask is because I am trying to change the style of all elements us...
I've been told not to use for...in with arrays in JavaScript. Why not?...
The same origin policy  I wanted to make a community wiki regarding HTML/JS same-origin policies to hopefully help anyone searching for this topic. This is one of the most searched-for topics on SO and there is no consolidated wiki for it so here I...
Suppose I'm familiar with developing client-side applications in jQuery, but now I'd like to start using AngularJS. Can you describe the paradigm shift that is necessary? Here are a few questions that might help you frame an answer:   How d...
I would like to upload a file asynchronously with jQuery. This is my HTML:  <span>File</span> <input type="file" id="file" name="file" size="10"/> <input id="uploadbutton" type="butto...

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