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I have a list like this one:
<li> .... </li> <li> .... </li> <li> .... </li> <li class="active"> .... </li> <li> .... </li> I want to find out the index (number in the list) of the item with the "active" class element. in this case the index would be 4 (or 3 if we're starting from 0) How can I do that?
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The index() method returns the index position of specified elements relative to other specified elements. The elements can be specified by jQuery selectors, or a DOM element. Note: If the element is not found, index() will return -1.
jQuery :eq() Selector The :eq() selector selects an element with a specific index number. The index numbers start at 0, so the first element will have the index number 0 (not 1). This is mostly used together with another selector to select a specifically indexed element in a group (like in the example above).
$("#myid li"). click(function() { this.id = 'newId'; // longer method using . attr() $(this). attr('id', 'newId'); });
jQuery :contains() SelectorThe :contains() selector selects elements containing the specified string. The string can be contained directly in the element as text, or in a child element. This is mostly used together with another selector to select the elements containing the text in a group (like in the example above).
With the .index() :
$('li.active').index() Working example here:
http://jsfiddle.net/EcZZL/
Edit - added link to the api for .index() per Nick's advice
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Like this:
var index = $("ul li.active").index(); .index() without parameters gives the index of the element with respect to it's siblings, which is what you want in this case.
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