Databases
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    <p>If you are checking <strong>whether something exists</strong>, <strong>use <code>.length</code> property</strong>. <code>.length</code> property contains number of elements matching the selector.</p> <p>Watch <a href="http://jsfiddle.net/SkxwQ/" rel="nofollow">this jsfiddle</a> to see that <strong>without using <code>.length</code></strong>, you will always get <code>true</code> <strong>regardless</strong> of whether there is some element or not.</p> <p><strong>EDIT:</strong></p> <p>After rethinking this (your description, your code and what you really want to achieve) my opinion is that your code should look as follows (see <a href="http://jsfiddle.net/zVSpg/2/" rel="nofollow">this jsfiddle</a>):</p> <pre><code>$('#plusexp').click(function() { var $cols3 = $('.cols3'); if ($cols3.is(':visible')){ $('.cols4').show(); }; $cols3.show(); }); </code></pre> <p>The reason for that is:</p> <ul> <li><p>you show <code>cols3</code> anyway, because:</p> <ul> <li>if both <code>cols3</code> and <code>cols4</code> are visible, you show <code>cols3</code>,</li> <li>if only one is shown, you show this element (if this is <code>cols3</code>, you show it, but if this is <code>cols4</code>, then showing <code>cols3</code> does not change anything),</li> </ul></li> <li><p><code>cols4</code> is shown only when <code>cols3</code> is visible before clicking (if both are invisible, then only <code>cols3</code> is shown),</p></li> <li><p>it is better to cache elements (in this case there is only one variable: <code>$cols3</code>),</p></li> </ul>
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    1. POjQuery hide / show elements
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    1. COThank you ! This also works!
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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