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    copied!<pre><code> &lt;div id="page-wrap"&gt; &lt;h1&gt;Indeterminate Checkboxes&lt;/h1&gt; &lt;ul&gt; &lt;li&gt; &lt;input type="checkbox" name="tall" id="tall"&gt; &lt;label for="tall"&gt;Tall Things&lt;/label&gt; &lt;ul&gt; &lt;li&gt; &lt;input type="checkbox" name="tall-1" id="tall-1"&gt; &lt;label for="tall-1"&gt;Buildings&lt;/label&gt; &lt;/li&gt; &lt;li&gt; &lt;input type="checkbox" name="tall-2" id="tall-2"&gt; &lt;label for="tall-2"&gt;Giants&lt;/label&gt; &lt;ul&gt; &lt;li&gt; &lt;input type="checkbox" name="tall-2-1" id="tall-2-1"&gt; &lt;label for="tall-2-1"&gt;Andre&lt;/label&gt; &lt;/li&gt; &lt;li&gt; &lt;input type="checkbox" name="tall-2-2" id="tall-2-2"&gt; &lt;label for="tall-2-2"&gt;Paul Bunyan&lt;/label&gt; &lt;/li&gt; &lt;/ul&gt; &lt;/li&gt; &lt;li&gt; &lt;input type="checkbox" name="tall-3" id="tall-3"&gt; &lt;label for="tall-3"&gt;Two sandwiches&lt;/label&gt; &lt;/li&gt; &lt;/ul&gt; &lt;/li&gt; &lt;li&gt; &lt;input type="checkbox" name="short" id="short"&gt; &lt;label for="short"&gt;Short Things&lt;/label&gt; &lt;ul&gt; &lt;li&gt; &lt;input type="checkbox" name="short-1" id="short-1"&gt; &lt;label for="short-1"&gt;Smurfs&lt;/label&gt; &lt;/li&gt; &lt;li&gt; &lt;input type="checkbox" name="short-2" id="short-2"&gt; &lt;label for="short-2"&gt;Mushrooms&lt;/label&gt; &lt;/li&gt; &lt;li&gt; &lt;input type="checkbox" name="short-3" id="short-3"&gt; &lt;label for="short-3"&gt;One Sandwich&lt;/label&gt; &lt;/li&gt; &lt;/ul&gt; &lt;/li&gt; &lt;/ul&gt; &lt;/div&gt; $(function() { // Apparently click is better chan change? Cuz IE? $('input[type="checkbox"]').change(function(e) { var checked = $(this).prop("checked"), container = $(this).parent(), siblings = container.siblings(); container.find('input[type="checkbox"]').prop({ indeterminate: false, checked: checked }); function checkSiblings(el) { var parent = el.parent().parent(), all = true; el.siblings().each(function() { return all = ($(this).children('input[type="checkbox"]').prop("checked") === checked); }); if (all &amp;&amp; checked) { parent.children('input[type="checkbox"]').prop({ indeterminate: false, checked: checked }); checkSiblings(parent); } else if (all &amp;&amp; !checked) { parent.children('input[type="checkbox"]').prop("checked", checked); parent.children('input[type="checkbox"]').prop("indeterminate", (parent.find('input[type="checkbox"]:checked').length &gt; 0)); checkSiblings(parent); } else { el.parents("li").children('input[type="checkbox"]').prop({ indeterminate: true, checked: false }); } } checkSiblings(container); }); }); </code></pre>
 

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