What are the possible reasons for document.getElementById, $("#id") or any other DOM method / jQuery selector not finding the elements?  Example problems include:   jQuery silently failing to bind an event handler jQuery "getter" me...

How can I change a class of an HTML element in response to an onclick event using JavaScript?...

Working on an idea for a simple HTMLElement wrapper I stumbled upon the following for Internet Explorer and Chrome:  For a given HTMLElement with ID in the DOM tree, it is possible to retrieve the div using its ID as the variable name. So for a di...

I've recently run into a rather nasty bug, wherein the code was loading a <select> dynamically via JavaScript.  This dynamically loaded <select> had a pre-selected value.  In IE6, we already had code to fix the selected <option&g...

I need to check the checked property of a checkbox and perform an action based on the checked property using jQuery.  For example, if the age checkbox is checked, then I need to show a textbox to enter age, else hide the textbox.  But the following...

I have a page where some event listeners are attached to input boxes and select boxes. Is there a way to find out which event listeners are observing a particular DOM node and for what event?  Events are attached using:   Prototype's Event.obse...

I have an HTML string representing an element: '<li>text</li>'. I'd like to append it to an element in the DOM (a ul in my case). How can I do this with Prototype or with DOM methods?  (I know i could do this easily in jQuer...

Consider the following:  <div onclick="alert('you clicked the header')" class="header">   <span onclick="alert('you clicked inside the header');">something inside the header</span> </div&...

I've got a script that inserts some content into an element using innerHTML.  The content could for example be:  <script type="text/javascript">alert('test');</script> <strong>test</strong>   Problem is t...

I would like to find out, in JavaScript, which element currently has focus. I've been looking through the DOM and haven't found what I need, yet. Is there a way to do this, and how?  The reason I was looking for this:  I'm trying to mak...