How do I add a class to a given element?

Question

I have an element that already has a class:

    

        
                      

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Answer 1

To add an additional class to an element:

To add a class to an element, without removing/affecting existing values, append a space and the new classname, like so:

document.getElementById("MyElement").className += " MyClass";

To change all classes for an element:

To replace all existing classes with one or more new classes, set the className attribute:

document.getElementById("MyElement").className = "MyClass";

(You can use a space-delimited list to apply multiple classes.)

Answer 2

I know IE9 is shutdown officially and we can achieve it with element.classList as many told above but I just tried to learn how it works without classList with help of many answers above I could learn it.

Below code extends many answers above and improves them by avoiding adding duplicate classes.

function addClass(element,className){
  var classArray = className.split(' ');
  classArray.forEach(function (className) {
    if(!hasClass(element,className)){
      element.className += " "+className;
    }
  });            
}
//this will add 5 only once
addClass(document.querySelector('#getbyid'),'3 4 5 5 5');

Answer 3

For those using Lodash and wanting to update className string:

// get element reference
var elem = document.getElementById('myElement');

// add some classes. Eg. 'nav' and 'nav header'
elem.className = _.chain(elem.className).split(/[\s]+/).union(['nav','navHeader']).join(' ').value()

// remove the added classes
elem.className = _.chain(elem.className).split(/[\s]+/).difference(['nav','navHeader']).join(' ').value()

Answer 4

Just to elaborate on what others have said, multiple CSS classes are combined in a single string, delimited by spaces. Thus, if you wanted to hard-code it, it would simply look like this:

<div class="someClass otherClass yetAnotherClass">
      <img ... id="image1" name="image1" />
</div>

From there you can easily derive the javascript necessary to add a new class... just append a space followed by the new class to the element's className property. Knowing this, you can also write a function to remove a class later should the need arise.

Answer 5

If you're only targeting modern browsers:

Use element.classList.add to add a class:

element.classList.add("my-class");

And element.classList.remove to remove a class:

element.classList.remove("my-class");

If you need to support Internet Explorer 9 or lower:

Add a space plus the name of your new class to the className property of the element. First, put an id on the element so you can easily get a reference.

<div id="div1" class="someclass">
    <img ... id="image1" name="image1" />
</div>

Then

var d = document.getElementById("div1");
d.className += " otherclass";

Note the space before otherclass. It's important to include the space otherwise it compromises existing classes that come before it in the class list.

See also element.className on MDN.

Answer 6

first, give the div an id. Then, call function appendClass:

<script language="javascript">
  function appendClass(elementId, classToAppend){
    var oldClass = document.getElementById(elementId).getAttribute("class");
    if (oldClass.indexOf(classToAdd) == -1)
    {
      document.getElementById(elementId).setAttribute("class", classToAppend);
    }
}
</script>