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    copied!<p>I have changed the structure of your HTML (you can change this and make sure you change the jquery selectors accordingly) .</p> <pre><code> &lt;ul class="secLevel"&gt; &lt;li&gt;&lt;input id="pr1" type="checkbox" class='mainfilter' /&gt;&lt;h3&gt;Product 1&lt;/h3&gt; &lt;ul class="secLevel" id="pr1Items" &gt; &lt;li&gt;&lt;input id="107A-10" type="checkbox" /&gt;&lt;label for="107A-10"&gt;107A-10&lt;/label&gt;&lt;/li&gt; &lt;li&gt;&lt;input id="107A-11" type="checkbox" /&gt;&lt;label for="107A-11"&gt;107A-11&lt;/label&gt;&lt;/li&gt; &lt;/ul&gt; &lt;/ul&gt; &lt;ul class="secLevel"&gt; &lt;li&gt;&lt;input id="pr2" type="checkbox" class='mainfilter' /&gt;&lt;h3&gt;Product 1&lt;/h3&gt; &lt;ul class="secLevel" id="pr1Items" &gt; &lt;li&gt;&lt;input id="someId1" type="checkbox" /&gt;&lt;label for="someId1"&gt;107A-10&lt;/label&gt;&lt;/li&gt; &lt;li&gt;&lt;input id="someId2" type="checkbox" /&gt;&lt;label for="someId2"&gt;107A-11&lt;/label&gt;&lt;/li&gt; &lt;/ul&gt; &lt;/ul&gt; </code></pre> <p>jquery</p> <pre><code>$('.mainfilter').change(function() { if($(this).is(':checked')){ $(this).parent().next('ul').children().attr('checked','checked'); }else{ $(this).parent().next('ul').children().removeAttr('checked'); } }); </code></pre> <p>For top level check box</p> <pre><code>&lt;input id="parentChkId" type="checkbox" /&gt; $('#parentChkId').change(function() { if($(this).is(':checked')){ $('#parentChkId input:checkbox').attr('checked','checked'); }else{ $('#parentChkId input:checkbox').removeAttr('checked'); } </code></pre> <p>});</p>
 

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