Where this is coming from  When I first learned jQuery, I normally attached events like this:  $('.my-widget a').click(function() {     $(this).toggleClass('active'); });   After learning more about selector speed and event delegati...

All right, say I have this:  <select id='list'>     <option value='1'>Option A</option>     <option value='2'>Option B</option>     <option value='3'>Option C</option> </s...

Is this:  var contents = document.getElementById('contents');   The same as this:  var contents = $('#contents');   Given that jQuery is loaded?...

I have a load of divs with the class testimonial and I want to use jquery to loop through them to check for each div if a specific condition is true. If it is true, it should perform an action.  Does anyone know how I would do this?...

jQuery.unique lets you get unique elements of an array, but the docs say the function is mostly for internal use and only operates on DOM elements. Another SO response said the unique() function worked on numbers, but that this use case is not nece...

Which is better to use as a performance perspective:  $(".div1 h2, .div1 h3")   or  $(".div1").find("h2, h3")...

Basically, is   $("#someid")   or  $(".someclass")   faster than  $("[someattr='value']")   I would imagine that it is (that is, selection by id is fastest, then class, then attribute), but does anyone know for sure?...

I'm considering one selection statement that would target one of many css class names in a single class attribute value based on a string prefix.  For example, I want any detail- prefixed class names to get targeted from the following sample link...

I just tried switching my application to jQuery 3. I was going through some testing and everything was working as expected, until I came to a piece of my application that used a '#' symbol in a selector. I have a piece of jQuery that looks li...

Why do I get this error and how can I test for it so it wont break, I tried checking for null but obviously that wont work, thanks.  Please don't advice to not write the ID like this as I know its wrong but it is a possibility.  var jsonTest = [...