Displaying a border on specific sides of a TextInput control in Flex

The following example shows how you can toggle which sides of a Flex TextInput control display the borderSides and borderStyle styles.

Full code after the jump.

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2008/07/08/displaying-a-border-on-specific-sides-of-a-textinput-control-in-flex/ -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
        layout="vertical"
        verticalAlign="middle"
        backgroundColor="white">

    <mx:Script>
        <![CDATA[
            private function setBorderSides():void {
                var arr:Array = [];
                if (leftCheckBox.selected) {
                    arr.push("left");
                }
                if (rightCheckBox.selected) {
                    arr.push("right");
                }
                if (topCheckBox.selected) {
                    arr.push("top");
                }
                if (bottomCheckBox.selected) {
                    arr.push("bottom");
                }
                textInput.setStyle("borderSides", arr.join(" "));
            }
        ]]>
    </mx:Script>

    <mx:ApplicationControlBar dock="true">
        <mx:Form styleName="plain">
            <mx:FormItem label="left:">
                <mx:CheckBox id="leftCheckBox"
                        selected="true"
                        change="setBorderSides();" />
            </mx:FormItem>
            <mx:FormItem label="right:">
                <mx:CheckBox id="rightCheckBox"
                        selected="true"
                        change="setBorderSides();" />
            </mx:FormItem>
            <mx:FormItem label="top:">
                <mx:CheckBox id="topCheckBox"
                        selected="true"
                        change="setBorderSides();" />
            </mx:FormItem>
            <mx:FormItem label="bottom:">
                <mx:CheckBox id="bottomCheckBox"
                        selected="true"
                        change="setBorderSides();" />
            </mx:FormItem>
        </mx:Form>
    </mx:ApplicationControlBar>

    <mx:TextInput id="textInput"
            borderSides="left right"
            borderColor="red"
            borderStyle="solid" />

</mx:Application>