jquery onclick add class code example

Example 1: jquery on click add class

$(document).ready(function(){
  $("button").click(function(){
    $(".p").addClass("intro");
  });
});

Example 2: addclass jquery

$( "p" ).addClass( "myClass yourClass" );

Example 3: add class jquery

$("#my_id").attr("class", "my_new_class_name");

Example 4: javascript add class to element

var someElement= document.getElementById("myElement");
    someElement.className += " newclass";//add "newclass" to element (space in front is important)