Cannot read property ‘style’ of undefined — Uncaught Type Error

Add your <script> to the bottom of your <body>, or add an event listener for DOMContentLoaded following this StackOverflow question. If that script executes in the <head> section of the code, document.getElementsByClassName(…) will return an empty array because the DOM is not loaded yet. You’re getting the Type Error because you’re referencing search_span[0], but search_span[0] … Read more

Javascript: ‘window’ is not defined

It is from an external js file and it is the only file linked to the page. OK. When I double click this file I get the following error Sounds like you’re double-clicking/running a .js file, which will attempt to run the script outside the browser, like a command line script. And that would explain … Read more

How do I select text nodes with jQuery?

jQuery doesn’t have a convenient function for this. You need to combine contents(), which will give just child nodes but includes text nodes, with find(), which gives all descendant elements but no text nodes. Here’s what I’ve come up with: Note: If you’re using jQuery 1.7 or earlier, the code above will not work. To fix this, … Read more

document.getElementbyId() returning null

You are executing your javascript code BEFORE the <div id=”connectedUnregistered” /> was actually created. Also note that you did not close your <div> with a corresponding </div>. So move your javascript code to a part below your HTML. Or execute it after the page finished loading. If you are using JQuery you can do: