Getting the Number of Controls Count using jQuery.

jQuery has Length property through which we can find the number of controls
Suppose,we have following HTML structure as shown below:-

<div id = div_1" class = "class1">
  <div id = div_2" class = "class2">container 1</div>
  <div id = div_3" class = "class2">container 2</div>
</div>

$('.class1').length;  
Output:- 1
$('.class2').length;
Output:- 2