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copied!<p>All three dijits <code>dijit/form/Select</code>, <code>dijit/form/FilteringSelect</code> and <code>dijit/form/ComboBox</code> subclass <code>dijit/_HasDropDown</code> and that adds them a property <code>dropDown</code>:</p> <pre><code>// dropDown: [protected] Widget // The widget to display as a popup. This widget *must* be // defined before the startup function is called. dropDown: null </code></pre> <p>What you want is to listen on this <code>dropDown</code> widget. The problem is that in the case of <code>ComboBox</code> and <code>FilteringSelect</code> this widget <code>dijit/form/_ComboBoxMenu</code> gets instantiated lazily, i.e. when you open popup for the first time. So you need to hook to opening dropDown in the first place and then add <code>onClick</code> event listener to the dropDown:</p> <pre><code>var signal = aspect.after(comboBox, "openDropDown", function() { comboBox.dropDown.on("click", function(node) { console.log("value:", comboBox.get("value")); console.log("selectedIndex:", domAttr.get(node, "item")); // <= this is not an identifier } signal.remove(); // remove aspect so it called only once } </code></pre> <p>It's a bit easier when working with <code>dijit/form/Select</code>, because <code>dropDown</code> exists and you can listen to <code>onExecute</code> on its dropDown <code>dijit/Menu</code> immediately:</p> <pre><code>select.dropDown.on("execute", function() { setTimeout(function() { console.log("value:", select.get("value")) }); }); </code></pre> <p>See all three in action at jsFiddle: <a href="http://jsfiddle.net/phusick/Hp5jr/" rel="nofollow">http://jsfiddle.net/phusick/Hp5jr/</a></p>

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