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    copied!<p>You might have issues with <code>attr</code>. Prior to jQuery 1.6 <code>attr("checked")</code> returned a boolean, now on 1.6+ it returns the attribute value. To get the boolean value you have to use <code>.prop (added on 1.6)</code>.</p> <p>On <a href="http://blog.jquery.it/2011/05/12/jquery-1-6-1-released/" rel="nofollow noreferrer"><strong>jQuery's blog about 1.6.1 release</strong></a> you will find information to <strong>upgrade from 1.5.2 to 1.6.1</strong>. This post also tells you a lot of details about <code>.prop</code> and <code>.attr</code>. You will also find the full change log.</p> <p>Both <a href="http://blog.jquery.it/2011/02/24/jquery-151-released/" rel="nofollow noreferrer">1.5.1 release post</a> and <a href="http://blog.jquery.it/2011/03/31/jquery-152-released/" rel="nofollow noreferrer">1.5.2 release post</a> doesn't present any information on upgrading, which might mean that there is no big changes to be done, but you have the complete list of changes for these versions that you might want to check guarantee.</p> <p>See</p> <ul> <li><a href="http://blog.jquery.it/2011/05/12/jquery-1-6-1-released/" rel="nofollow noreferrer">jQuery 1.6.1 release notes</a></li> <li><a href="http://blog.jquery.it/2011/02/24/jquery-151-released/" rel="nofollow noreferrer">jQuery 1.5.2 release notes</a></li> <li><a href="http://blog.jquery.it/2011/03/31/jquery-152-released/" rel="nofollow noreferrer">jQuery 1.5.1 release notes</a></li> <li><a href="https://stackoverflow.com/q/5874652/340760">javascript - .prop() vs .attr()</a></li> <li><a href="http://api.jquery.com/prop/" rel="nofollow noreferrer">jQuery .prop</a></li> </ul> <blockquote> <p><strong>Description</strong>: Get the value of a property for the first element in the set of matched elements.</p> </blockquote>
 

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