Setting the border color on a Spark DropDownList control in Flex 4

In a previous example, “Setting the border alpha on a Spark DropDownList control in Flex 4”, we saw how you could set the border alpha on a Spark DropDownList control’s popup menu in Flex 4 by setting the borderAlpha style.

The following example shows how you can set the border color on a Spark DropDownList control’s popup menu in Flex 4 by setting the borderColor style.

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/2010/03/20/setting-the-border-color-on-a-spark-dropdownlist-control-in-flex-4/ -->
<s:Application name="Spark_DropDownList_borderColor_test"
        xmlns:fx="http://ns.adobe.com/mxml/2009" 
        xmlns:s="library://ns.adobe.com/flex/spark" 
        xmlns:mx="library://ns.adobe.com/flex/mx">
    <s:controlBarContent>
        <mx:Form>
            <mx:FormItem label="borderColor:">
                <mx:ColorPicker id="clrPckr" change="ddl.openDropDown();" />
            </mx:FormItem>
        </mx:Form>
    </s:controlBarContent>
 
    <s:DropDownList id="ddl"
            borderColor="{clrPckr.selectedColor}"
            requireSelection="true"
            dropShadowVisible="false"
            horizontalCenter="0" top="20">
        <s:dataProvider>
            <s:ArrayList source="[One,Two,Three,Four,Five,Six,Seven]" />
        </s:dataProvider>
    </s:DropDownList>
 
</s:Application>

[GoogleAdsWide]

View source is enabled in the following example.

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

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2010/03/20/setting-the-border-color-on-a-spark-dropdownlist-control-in-flex-4/ -->
<s:Application name="Spark_DropDownList_borderColor_test"
        xmlns:fx="http://ns.adobe.com/mxml/2009" 
        xmlns:s="library://ns.adobe.com/flex/spark" 
        xmlns:mx="library://ns.adobe.com/flex/mx">
 
    <fx:Style>
        @namespace s "library://ns.adobe.com/flex/spark";
        @namespace mx "library://ns.adobe.com/flex/mx";
 
        s|DropDownList {
            borderColor: haloOrange;
        }
    </fx:Style>
 
    <s:DropDownList id="ddl"
            requireSelection="true"
            dropShadowVisible="false"
            horizontalCenter="0" top="20"
            creationComplete="ddl.openDropDown();">
        <s:dataProvider>
            <s:ArrayList source="[One,Two,Three,Four,Five,Six,Seven]" />
        </s:dataProvider>
    </s:DropDownList>
 
</s:Application>

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

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2010/03/20/setting-the-border-color-on-a-spark-dropdownlist-control-in-flex-4/ -->
<s:Application name="Spark_DropDownList_borderColor_test"
        xmlns:fx="http://ns.adobe.com/mxml/2009" 
        xmlns:s="library://ns.adobe.com/flex/spark" 
        xmlns:mx="library://ns.adobe.com/flex/mx">
    <s:controlBarContent>
        <mx:Form>
            <mx:FormItem label="borderColor:">
                <mx:ColorPicker id="clrPckr"
                        change="clrPckr_changeHandler(event);"/>
            </mx:FormItem>
        </mx:Form>
    </s:controlBarContent>
 
    <fx:Script>
        <![CDATA[
            import mx.events.ColorPickerEvent;
 
            protected function clrPckr_changeHandler(evt:ColorPickerEvent):void {
                ddl.setStyle("borderColor", evt.color);
                ddl.openDropDown();
            }
        ]]>
    </fx:Script>
 
    <s:DropDownList id="ddl"
            requireSelection="true"
            dropShadowVisible="false"
            horizontalCenter="0" top="20">
        <s:dataProvider>
            <s:ArrayList source="[One,Two,Three,Four,Five,Six,Seven]" />
        </s:dataProvider>
    </s:DropDownList>
 
</s:Application>

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.

One thought on “Setting the border color on a Spark DropDownList control in Flex 4

  1. Great Article! Is there a way to change the color on the main dropdownlist container itself? right now you have the dropdown popup border changing but is it possible to have the parent border change as well?

    Thanks
    Andy

Comments are closed.