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Validator in Flex4
Posted on: May 28, 2010 at 12:00 AM
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The Validator class validates the text field value. If the text is blank it will give an error message.

Validator in Flex4:

The Validator class validates the text field value. If the text is blank it will give an error message. If you will write anything in the text field then it will not generate a error message. Basically it is used for a required field. 
The tag of Validator is <mx:Validator>.

Example:

<?xml version="1.0" encoding="utf-8"?>

<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"

xmlns:s="library://ns.adobe.com/flex/spark"

xmlns:mx="library://ns.adobe.com/flex/mx"

minWidth="955" minHeight="600">

<fx:Script>

<![CDATA[

import mx.controls.Alert;

]]>

</fx:Script>

<fx:Declarations>

<mx:Validator id="reqValid" required="true"

source="{fname}" property="text" trigger="{btn}"

triggerEvent="click"

valid="Alert.show('Submitted Successfully');"/>

</fx:Declarations>

<s:Panel title="Validator Example" width="550">

<mx:Form width="548" backgroundColor="#101446" color="#FFFFFF">

<mx:FormItem label="First Name: " required="true">

<s:TextInput id="fname" width="100%" color="#000000"/>

</mx:FormItem>

<mx:FormItem label="Last Name: " required="false">

<s:TextInput id="lname" width="100%" color="#000000"/>

</mx:FormItem>

<mx:FormItem>

<s:Button id="btn"

label="Submit"

chromeColor="#5F1B0C"/>

</mx:FormItem>

</mx:Form>

</s:Panel>

</s:Application>

Output:

Running Application:

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Posted on: May 28, 2010

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