Setting alternating item colors on a Spark DropDownList control in Flex 4

The following example shows how you can set alternating item colors on a Spark DropDownList control in Flex 4 by setting the alternatingItemColors style.

Full code after the jump.

The following example(s) require Flash Player 10 and the Adobe Flex 4 SDK. To download the Adobe Flash Builder 4 trial, see www.adobe.com/products/flex/. To download the latest nightly build of the Flex 4 SDK, see opensource.adobe.com/wiki/display/flexsdk/Download+Flex+4.

For more information on getting started with Flex 4 and Flash Builder 4, see the official Adobe Flex Team blog.

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2009/08/08/setting-alternating-item-colors-on-a-spark-dropdownlist-control-in-flex-4/ -->
<s:Application name="Spark_DropDownList_alternatingItemColors_test"
        xmlns:fx="http://ns.adobe.com/mxml/2009"
        xmlns:s="library://ns.adobe.com/flex/spark"
        xmlns:mx="library://ns.adobe.com/flex/halo">
 
    <s:DropDownList id="dropDownList"
            alternatingItemColors="[#EEEEEE,#DFDFDF]"
            requireSelection="true"
            width="100"
            horizontalCenter="0"
            top="40"
            creationComplete="dropDownList.openDropDown();">
        <s:dataProvider>
            <s:ArrayList source="[The,Quick,Brown,Fox,Jumps,Over,The,Lazy,Dog]" />
        </s:dataProvider>
    </s:DropDownList>
 
</s:Application>

View source is enabled in the following example.

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You can also set the alternatingItemColors style in an external .CSS file or <Style/> block, as seen in the following example:

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2009/08/08/setting-alternating-item-colors-on-a-spark-dropdownlist-control-in-flex-4/ -->
<s:Application name="Spark_DropDownList_alternatingItemColors_test"
        xmlns:fx="http://ns.adobe.com/mxml/2009"
        xmlns:s="library://ns.adobe.com/flex/spark"
        xmlns:mx="library://ns.adobe.com/flex/halo">
 
    <fx:Style>
        @namespace s "library://ns.adobe.com/flex/spark";
        @namespace mx "library://ns.adobe.com/flex/halo";
 
        s|DropDownList {
            alternatingItemColors: #EEEEEE,#DFDFDF;
        }
    </fx:Style>
 
    <s:DropDownList id="dropDownList"
            requireSelection="true"
            width="100"
            horizontalCenter="0"
            top="40"
            creationComplete="dropDownList.openDropDown();">
        <s:dataProvider>
            <s:ArrayList source="[The,Quick,Brown,Fox,Jumps,Over,The,Lazy,Dog]" />
        </s:dataProvider>
    </s:DropDownList>
 
</s:Application>

Or you can set the alternatingItemColors style using ActionScript, as seen in the following example:

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2009/08/08/setting-alternating-item-colors-on-a-spark-dropdownlist-control-in-flex-4/ -->
<s:Application name="Spark_DropDownList_alternatingItemColors_test"
        xmlns:fx="http://ns.adobe.com/mxml/2009"
        xmlns:s="library://ns.adobe.com/flex/spark"
        xmlns:mx="library://ns.adobe.com/flex/halo">
 
    <fx:Script>
        <![CDATA[
            protected function btn_click(evt:MouseEvent):void {
                dropDownList.setStyle("alternatingItemColors", [0xEEEEEE, 0xDFDFDF]);
                dropDownList.openDropDown();
            }
        ]]>
    </fx:Script>
 
    <s:Button id="btn"
            label="Set alternating item colors"
            click="btn_click(event);"
            left="10" top="10" />
 
    <s:DropDownList id="dropDownList"
            requireSelection="true"
            width="100"
            horizontalCenter="0"
            top="40"
            creationComplete="dropDownList.openDropDown();">
        <s:dataProvider>
            <s:ArrayList source="[The,Quick,Brown,Fox,Jumps,Over,The,Lazy,Dog]" />
        </s:dataProvider>
    </s:DropDownList>
 
</s:Application>

Finally, the following example shows how you can use the alternatingItemColors style with a Spark DropDownList control with a multicolumn TileLayout layout:

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2009/08/08/setting-alternating-item-colors-on-a-spark-dropdownlist-control-in-flex-4/ -->
<s:Application name="Spark_DropDownList_alternatingItemColors_test"
        xmlns:fx="http://ns.adobe.com/mxml/2009"
        xmlns:s="library://ns.adobe.com/flex/spark"
        xmlns:mx="library://ns.adobe.com/flex/halo">
 
    <s:DropDownList id="dropDownList"
            alternatingItemColors="[#EEEEEE,#DFDFDF]"
            requireSelection="true"
            width="200"
            horizontalCenter="0"
            top="40"
            creationComplete="dropDownList.openDropDown();">
        <s:dataProvider>
            <s:ArrayList source="[The,Quick,Brown,Fox,Jumps,Over,The,Lazy,Dog]" />
        </s:dataProvider>
        <s:layout>
            <s:TileLayout horizontalGap="0" verticalGap="0"
                    columnWidth="80" rowHeight="60"
                    requestedRowCount="2" />
        </s:layout>
    </s:DropDownList>
 
</s:Application>

View source is enabled in the following example.

This entry is based on a beta version of the Flex 4 SDK and therefore is very likely to change as development of the Flex SDK continues. The API can (and will) change causing examples to possibly not compile in newer versions of the Flex 4 SDK.

4 thoughts on “Setting alternating item colors on a Spark DropDownList control in Flex 4

  1. Hi
    I am using the halo themes and how do i set the alternating item colors style. I get warning saying ‘alternating item colors is only supported by Spark Theme’

    Thanks
    ilikeflex

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