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    copied!<p>Add a custom attribute to the options and keep the same values throughout the group.</p> <pre><code>&lt;select name="test" class="select" id="test" multiple="multiple" style="width: 100%;"&gt; &lt;option data-index="1" value="1" class="first"&gt;1&lt;/option&gt; &lt;option data-index="1" value="2" class="first"&gt;2&lt;/option&gt; &lt;option data-index="1" value="3" class="first"&gt;3&lt;/option&gt; &lt;option data-index="2" value="a" id="1" class="hidden second"&gt;a&lt;/option&gt; &lt;option data-index="2" value="b" id="1" class="hidden second"&gt;b&lt;/option&gt; &lt;option data-index="2" value="c" id="1" class="hidden second"&gt;c&lt;/option&gt; &lt;option data-index="2" value="x" id="2" class="hidden second"&gt;x&lt;/option&gt; &lt;option data-index="2" value="y" id="2" class="hidden second"&gt;y&lt;/option&gt; &lt;option data-index="2" value="z" id="2" class="hidden second"&gt;z&lt;/option&gt; &lt;option data-index="2" value="baz" id="3" class="hidden second"&gt;baz&lt;/option&gt; &lt;option data-index="2" value="bar" id="3" class="hidden second"&gt;bar&lt;/option&gt; &lt;option data-index="2" value="foo" id="3" class="hidden second"&gt;foo&lt;/option&gt; &lt;/select&gt; $("select#test").change(function () { //get the data-index attribute of the selected option var nIndex = $('option[value= '+ $(this).val()+']').attr('data-index'); //get all elements with the attribute data-index = nIndex $('option[data-index= '+ nIndex +']').removeClass("hidden"); $(".first").addClass("hidden"); }); </code></pre>
 

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