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POjquery: find common elements in 2 sets of divs
 

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    <p>For a markup like this:</p> <pre><code>&lt;div id="set1"&gt; &lt;div id="100"&gt;a div&lt;/div&gt; &lt;div id="101"&gt;another div&lt;/div&gt; &lt;div id="102"&gt;another div 2&lt;/div&gt; &lt;div id="120"&gt;same div&lt;/div&gt; &lt;/div&gt; &lt;div id="set2"&gt; &lt;div id="105"&gt;a different div&gt; &lt;div id="101"&gt;another div&lt;/div&gt; &lt;div id="110"&gt;more divs&lt;/div&gt; &lt;div id="120"&gt;same div&lt;/div&gt; &lt;/div&gt; </code></pre> <p>As you can see both #set1 and #set2 contain 2 divs with the same id (101, 120). Is it possible somehow with jQuery to find the common elements and add a class to the divs in #set1 that have the same id with divs in #set2?</p> <p>In other words after the script run the above code would look like this:</p> <pre><code>&lt;div id="set1"&gt; &lt;div id="100"&gt;a div&lt;/div&gt; &lt;div id="101" class="added"&gt;another div&lt;/div&gt; &lt;div id="102"&gt;another div 2&lt;/div&gt; &lt;div id="120" class="added"&gt;same div&lt;/div&gt; &lt;/div&gt; &lt;div id="set2"&gt; &lt;div id="105"&gt;a different div&gt; &lt;div id="101"&gt;another div&lt;/div&gt; &lt;div id="110"&gt;more divs&lt;/div&gt; &lt;div id="120"&gt;same div&lt;/div&gt; &lt;/div&gt; </code></pre> <p><strong>EDIT</strong> playing around with it i did something but i am not sure it can go anywhere. I created an array with the ids in both sets and in Firebug i can see an array with the values</p> <pre><code> var arrEl = []; $('#set1 div, #set2 div').each( function(index) { var id = $(this).attr('id'); arrEl.push(id); //maybe somehow check the array for the values that appear twice, and add the class to the //matching divs? }); </code></pre>
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