.size()

The .size() method is deprecated as of jQuery 1.8. Use the .length property instead.

The .size() method is functionally equivalent to the .length property; however, the .length property is preferred because it does not have the overhead of a function call.

Given a simple unordered list on the page:

<ul>
  <li>foo</li>
  <li>bar</li>
</ul>

Both .size() and .length identify the number of items:

alert( "Size: " + $( "li" ).size() );
alert( "Size: " + $( "li" ).length );

This results in two alerts:

Size: 2

Size: 2