How to count tr elements with jquery?
<pre><code>&lt;table&gt;
   &lt;tr&gt;
     &lt;td&gt;data&lt;/td&gt;
     &lt;td&gt;data&lt;/td&gt;
   &lt;/tr&gt;
   &lt;tr class='product_details'&gt;
     &lt;td&gt;product details&lt;/td&gt;
     &lt;td&gt;product details&lt;/td&gt;
   &lt;/tr&gt;
   &lt;tr class='product_details'&gt;
     &lt;td&gt;product details&lt;/td&gt;
     &lt;td&gt;product details&lt;/td&gt;
   &lt;/tr&gt;
&lt;/table&gt;
</code></pre>

<p>I want to count table rows whose class is product_details. How I do that with jQuery?</p>
