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 want to iterate over some DOM elements, I'm doing this:  document.getElementsByClassName( "myclass" ).forEach( function(element, index, array) {   //do stuff });   but I get an error: document.getElementsByClassName("myclass")...

Alright, I've dabbled in JavaScript before, but the most useful thing I've written is a CSS style-switcher. So I'm somewhat new to this. Let's say I have HTML code like this:  <div id="foo">     <div class="bar&...

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I have looked through a number of similar questions but can not find a specific example of one that answers in vanilla JS how to add and remove a class to a different element from the one clicked on. I know it has something to do with setting up a lo...

I am using LitElement to create custom Web Components. I am fairly new at it and decided to try making image slideshow. I used W3Schools slideshow as reference while modifying it to work as LitElement.  The problem is, that when I am trying to use do...

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I am having issues figuring out how to resolve the getElementsByClassName issue in IE.  How would I best implement the robert nyman (can't post the link to it since my rep is only 1) resolution into my code? Or would a jquery resolution be better...

I'm trying to set up a script that sets invisible everything with a certain class name.  This is an example of what I'm trying to call:  <script type="text/javascript"> function hideItems(){         document.getElementsByClassNa...

Am I missing something with getElementsByClassName() and querySelectorAll()?  In Firefox 9 and Chrome 17 and probably all browsers, it seems that both of these functions return an empty array when executed on an AJAX response.  See the following link...