CSS Class Not Updating in WordPress Using JavaScript

Looking to incorporate a small JavaScript code directly into The Twenty Sixteen theme in WordPress.

This HTML Code needs to be modified on the Page: 

<p class="site-description">Example Text</p>

The goal is to change a classname:

document.getElementsByClassName("site-description").className ="Site-example-class";

However, despite using FireBug on the page, the class site-description remains unchanged.

Additionally, attempting to select the text of the headline with this code:

document.getElementsByClassName("site-description").innerHTML ="Hello There";

has proven to be unsuccessful.

javascriptwordpress

Answer №1

To access all elements with the "site-description" class, you can use the <code>document.getElementsByClassName("site-description")
method which will return an array of those elements. To make changes to their innerHTML, you must do so within the array. If there is only one element with this class name, you can directly modify it like so :

document.getElementsByClassName("site-description")[0].innerHTML = "Insert your new HTML content here"

Answer №2

The method getElementsByClassName() will provide you with an array containing all matching elements. To refer to the first result, you can simply do 

document.getElementsByClassName("site-description")[0]

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