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...

When I want to prevent other event handlers from executing after a certain event is fired, I can use one of two techniques. I'll use jQuery in the examples, but this applies to plain-JS as well:  1. event.preventDefault()  $('a').click(...

Is there any way to select/manipulate CSS pseudo-elements such as ::before and ::after (and the old version with one semi-colon) using jQuery?  For example, my stylesheet has the following rule:  .span::after{ content:'foo' }   How can I ch...

Is there a solid way to detect whether or not a user is using a mobile device in jQuery? Something similar to the CSS @media attribute? I would like to run a different script if the browser is on a handheld device.  The jQuery $.browser function is...

I have a data structure like this :  var someObject = {     'part1' : {         'name': 'Part 1',         'size': '20',         'qty' : '50'     },     'part2' : {         'name...

I would like to manipulate the HTML inside an iframe using jQuery.  I thought I'd be able to do this by setting the context of the jQuery function to be the document of the iframe, something like:  $(function(){ //document ready     $('some...

I want to be able to preview a file (image) before it is uploaded.  The preview action should be executed all in the browser without using Ajax to upload the image.  How can I do this?...

Essentially I want to have a script execute when the contents of a DIV change. Since the scripts are separate (content script in the Chrome extension & webpage script), I need a way simply observe changes in DOM state. I could set up polling bu...

Here are two pages, test.php and testserver.php.  test.php  <script src="scripts/jq.js" type="text/javascript"></script> <script>     $(function() {         $.ajax({url:"testserver.php",             success...