How Do I Add a Class to an HTML Element Using JavaScript?
Dec 16, 2024 am 02:47 AM
How to Add a Class to a Given Element Using JavaScript
To add a class to an existing element, you can utilize several approaches, depending on browser compatibility requirements.
Modern Browsers
For modern browsers, the classList property provides a straightforward solution:
element.classList.add("my-class");
This code will add the "my-class" class to the specified element. To remove a class, use classList.remove.
Internet Explorer 9 and Lower
For older browsers like Internet Explorer 9 and below, you can manually modify the className property:
var d = document.getElementById("div1");
d.className += " otherclass";
Ensure to include a space before the new class name, as this prevents conflicts with existing classes.
Additional Notes
- The classList property is supported in all major modern browsers, including Chrome, Firefox, Safari, Edge, and Opera.
- For more information on the classList property and other methods for manipulating classes, refer to the MDN documentation on element.className.
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