W3.JS Add Classes to HTML
Add a class:
w3.addClass(selector,'class')
Add multiple classes:
w3.addClass(selector,'class1 class2 class3...')
Add Class by Id
Add the "marked" class to an element with id="London":
Example
<button onclick="w3.addClass('#London','marked')">Add Class</button>
Add Class by Tag
Add the "marked" class to all <h2> elements:
Example
<button onclick="w3.addClass('h2','marked')">Add Class</button>
Add Class by Class
Add the "marked" class to an elements with class="London":
Example
<button onclick="w3.addClass('.city','marked')">Add Class</button>
Add Multiple Classes
To add multiple classes to an element, separate each class with a space.
Add both "class1" and "class2" to an element with id="London":
Example
<button onclick="w3.addClass('#London','class1 class2')">Add
Classes</button>
Remove classes from HTML elements
Remove a class:
w3.removeClass(selector,'class')
Remove multiple classes:
w3.removeClass(selector,'class1 class2 class3...')
Remove Class by Id
Remove the "marked" class from an element with id="London":
Example
<button onclick="w3.removeClass('#London','marked')">Remove Class</button>
Remove Class by Tag
Remove the "marked" class from all <h2> elements:
Example
<button onclick="w3.removeClass('h2','marked')">Remove Class</button>
Remove Class by Class
Remove the "marked" class from all elements with class="city":
Example
<button onclick="w3.removeClass('.city','marked')">Remove Class</button>
Remove Multiple Classes
To remove multiple classes from an element, separate each class with a space.
Remove both "class1" and "class2" from an element with id="London":
Example
<button onclick="w3.removeClass('#London','class1 class2')">Remove
Classes</button>
Toggle the Class of HTML elements
Toggle a class (on/off):
w3.toggleClass(selector,'class')
Toggle between two classes:
w3.toggleClass(selector,'property','class','class')
Toggle Class by Id
Toggle between the "marked" class of an element with id="London":
Example
<button onclick="w3.toggleClass('#London','marked')">Toggle</button>
Toggle Class by Tag
Toggle between the "marked" class of all <h2> elements:
Example
<button onclick="w3.toggleClass('h2','marked')">Toggle</button>
Toggle Class by Class
Toggle between the "marked" class of all elements with class="city":
Example
<button onclick="w3.toggleClass('.city','marked')">Toggle</button>
Toggle Multiple Classes
Toggle between the class name "class1" and "class2" of id="London:
Example
<button onclick="w3.toggleClass('#London','class1','class2')">Toggle</button>
