JavaScript Reference
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Quick Reference

The Element className property sets or returns an element’s class attribute.

<!-- html element to place output -->
<p id="my_output" class="class1 class2 class3"></p>

Getting the class attribute:

// variable
let my_classes = document.getElementById('my_output').className;

// output to the HTML element
document.getElementById('my_output').innerHTML = my_classes;

Setting the class attribute:

document.getElementById('my_output').className = 'new_style';

Output

class1 class2 class3 new_style

Syntax

Getting the class attribute:

element.className

Setting the class attribute:

element.className = class

JavaScript Notes:

  • When using JavaScript, single or double quotation marks are acceptable and work identically to one another; choose whichever you prefer, and stay consistent
  • JavaScript is a case-sensitive language; firstName is NOT the same as firstname
  • Arrays count starting from zero NOT one; so item 1 is position [0], item 2 is position [1], and item 3 is position [2] … and so on
  • JavaScript variables must begin with a letter, $, or _
  • JavaScript variables are case sensitive (x is not the same as X)
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