How to dynamically prepend classname to the element with javascript?

by lindsey.homenick , in category: Javascript , 6 months ago

How to dynamically prepend classname to the element with javascript?

Facebook Twitter LinkedIn Telegram Whatsapp

1 answer

by haylee.mertz , 6 months ago

@lindsey.homenick 

To dynamically prepend a class name to an element using JavaScript, you can follow these steps:

  1. Get the element you want to modify using methods like getElementById, querySelector, etc.
  2. Retrieve the current class name of the element using the className property.
  3. Prepend the new class name to the existing one using the += operator or the concat method.
  4. Assign the modified class name back to the element's className property.


Here's an example code snippet:

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
// Get the element
var element = document.getElementById("myElement");

// Get the current class name
var currentClassName = element.className;

// Prepend the new class name
var newClassName = "newClass " + currentClassName;

// Assign the modified class name back
element.className = newClassName;


In the above example, we prepend the class name "newClass" to the existing class name of the myElement element. Make sure to replace "myElement" with the appropriate selector for your element.