How can I remove all CSS classes using jQuery/JavaScript?

Instead of individually calling $("#item").removeClass() for every single class an element might have, is there a single function which can be called which removes all CSS classes from the given element?

Both jQuery and raw JavaScript will work.

$("#item").removeClass();

Calling removeClass with no parameters will remove all of the item's classes.

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You can also use (but it is not necessarily recommended. The correct way is the one above):

$("#item").removeAttr('class');
$("#item").attr('class', '');
$('#item')[0].className = '';

If you didn't have jQuery, then this would be pretty much your only option:

document.getElementById('item').className = '';

Hang on, doesn't removeClass() default to removing all classes if nothing specific is specified? So

$("#item").removeClass();

will do it on its own...

Just set the className attribute of the real DOM element to '' (nothing).

$('#item')[0].className = ''; // the real DOM element is at [0]

Other people have said that just calling removeClass works - I tested this with the Google jQuery Playground: http://savedbythegoog.appspot.com/?id=ag5zYXZlZGJ5dGhlZ29vZ3ISCxIJU2F2ZWRDb2RlGIS61gEM ... and it works. So you can also do it this way:

$("#item").removeClass();

Of course.

$('#item')[0].className = '';
// or
document.getElementById('item').className = '';

Remove specific classes:

$('.class').removeClass('class');

Say if element has class="class another-class".

The shortest method

$('#item').removeAttr('class').attr('class', '');

You can just try:

$(document).ready(function() {
   $('body').find('#item').removeClass();
});

If you have to access that element without a class name, for example you have to add a new class name, you can do this:

$(document).ready(function() {
   $('body').find('#item').removeClass().addClass('class-name');
});

I use that function in my project to remove and add classes in an HTML builder.

I like using native JavaScript to do this, believe it or not!

solution 1: className

1. Remove all class of all items

const items = document.querySelectorAll('item');
for (let i = 0; i < items.length; i++) {
  items[i].className = '';
}

2. Only remove all class of the first item

const item1 = document.querySelector('item');
item1.className = '';

solution 2: classList

// remove all class of all items
 const items = [...document.querySelectorAll('.item')];
 for (const item of items) {
   item.classList.value = '';
 }

 // remove all class of the first item
 const items = [...document.querySelectorAll('.item')];
 for (const [i, item] of items.entries()) {
   if(i === 0) {
     item.classList.value = '';
   }
 }

 // or
 const item = document.querySelector('.item');
 item.classList.value = '';

> jQuery ways (not recommended)

1. $("#item").removeClass();

2. $("#item").removeClass("class1 ... classn");

refs

https://developer.mozilla.org/en-US/docs/Web/API/Element/className

https://developer.mozilla.org/en-US/docs/Web/API/Element/classList

$('#elm').removeAttr('class');

Attribute "class" will no longer be present in "elm".

Since not all versions of jQuery are created equal, you may run into the same issue I did, which means calling $("#item").removeClass(); does not actually remove the class (probably a bug).

A more reliable method is to simply use raw JavaScript and remove the class attribute altogether.

document.getElementById("item").removeAttribute("class");

Let's use this example. Maybe you want the user of your website to know a field is valid or it needs attention by changing the background color of the field. If the user hits reset then your code should only reset the fields that have data and not bother to loop through every other field on your page.

> This jQuery filter will remove the class "highlightCriteria" only for > the input or select fields that have this class.

$form.find('input,select').filter(function () {
	if((!!this.value) && (!!this.name)) {
		$("#"+this.id).removeClass("highlightCriteria");
	}
});

Try with removeClass.

For instance:

var nameClass=document.getElementsByClassName("clase1");
console.log("after", nameClass[0]);
$(".clase1").removeClass();
var nameClass=document.getElementsByClassName("clase1");
console.log("before", nameClass[0]);

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="clase1">I am a Div with class="clase1"</div>

I had a similar issue. In my case, on disabled elements was applied that aspNetDisabled class and all disabled controls had wrong colors. So, I used jQuery to remove this class on every element/control I want and everything works and looks great now.

This is my code for removing aspNetDisabled class:

$(document).ready(function () {

    $("span").removeClass("aspNetDisabled");
    $("select").removeClass("aspNetDisabled");
    $("input").removeClass("aspNetDisabled");

});