jQuery : Using Attributes

In jQuery, you can actually find elements based on any kind of attribute. It comes with a bunch of attribute selector types and in this article, we will look into some of them.

Find elements with a specific attribute

The most basic task when selecting elements based on attributes is to find all the elements which has a specific attribute. Be aware that the next example doesn't require the attribute to have a specific value, in fact, it doesn't even require it to have a value. The syntax for this selector is a set of square brackets with the name of the desired attribute inside it, for instance [name] or [href]. Here is an example:

<span title="Title 1">Test 1</span><br /><span>Test 2</span><br /><span title="Title 3">Test 3</span><br /><script type="text/javascript">
$(function(){        $("[title]").css("text-decoration", "underline");});</script>

We use the attribute selector to find all elements on the page which has a title attribute and then underline it. As mentioned, this will match elements with a title element no matter what their value is, but sometimes you will want to find elements with a specific attribute which has a specific value.

Find elements with a specific value for a specific attribute

Here's an example where we find elements with a specific value:

<a href="http://www.google.com" target="_blank">Link 1</a><br /><a href="http://www.google.com" target="_self">Link 2</a><br /><a href="http://www.google.com" target="_blank">Link 3</a><br /><script type="text/javascript">
$(function(){        $("a[target='_blank']").append(" [new window]");});</script>

The selector simply tells jQuery to find all links (the a elements) which has a target attribute that equals the string value "_blank" and then append the text "[new window]" to them. But what if you're looking for all elements which don't have the value? Inverting the selector is very easy:

$("a[target!='_blank']").append(" [same window]");

The difference is the != instead of =, a common way of negating an operator within many programming languages.

And there's even more possibilities:

Find elements with a value which starts with a specific string using the ^= operator:

$("input[name^='txt']").css("color", "blue");

Find elements with a value which ends with a specific string using the $= operator:

$("input[name$='letter']").css("color", "red");

Find elements with a value which contains a specific word:

$("input[name*='txt']").css("color", "blue");

Source:http://www.tutorialsdesk.com/2012/08/jquery-using-attributes.html