The index method

The index method returns the index of an element in a jQuery set (zero-based indexing).

Syntax

Returns the position number of the first selected element, relative to adjacent elements on the page (adjacent elements are elements that have a common parent):

javascript.index();

Returns the position number of the first selected element among the elements that satisfy the selector. If such an element is not found, the method returns -1:

javascript.index(selector);

The parameter can also be a DOM element or a jQuery object (if it contains multiple elements, the method will be executed for the first one):

javascript.index(element);

Example

Let's print the number li with #test:

html<ol>
  <li>text</li>
  <li id="test">text</li>
  <li>text</li>
</ol>

javascriptlet num = $('li').index('#test');
alert(num);

See also