Setting the number of visible items in a ComboBox control's dropdown menu in Flex
Problem
You want to set the number of items that appear at once in a Flex ComboBox control's dropdown menu.
Solution
The following example shows how you can set the number of visible items in a Flex ComboBox control’s dropdown menu by setting the rowCount property.
Detailed explanation
<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2008/06/11/setting-the-number-of-visible-items-in-a-combobox-controls-dropdown-menu-in-flex/ -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
layout="vertical"
verticalAlign="top"
backgroundColor="white">
<mx:Script>
<![CDATA[
import mx.events.NumericStepperEvent;
private function numericStepper_change(evt:NumericStepperEvent):void {
callLater(comboBoxOpen);
}
private function comboBoxOpen():void {
comboBox.open();
}
]]>
</mx:Script>
<mx:Array id="arr">
<mx:Object label="One" />
<mx:Object label="Two" />
<mx:Object label="Three" />
<mx:Object label="Four" />
<mx:Object label="Five" />
<mx:Object label="Six" />
<mx:Object label="Seven" />
<mx:Object label="Eight" />
<mx:Object label="Nine" />
</mx:Array>
<mx:ApplicationControlBar dock="true">
<mx:NumericStepper id="numericStepper"
minimum="0"
maximum="10"
change="numericStepper_change(event);" />
</mx:ApplicationControlBar>
<mx:ComboBox id="comboBox"
dataProvider="{arr}"
rowCount="{numericStepper.value}"
openDuration="0"
closeDuration="0"
width="100" />
</mx:Application>
For more information, see "Setting the number of visible items in a ComboBox control's dropdown menu in Flex" at FlexExamples.com.
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