In a Flex mobile app (or any Flex 4 application) - how can you enable/disable a button depending on the contents of 2 other fields?
I am pasting my very simple test code below and the problem with it is the syntax error in Flash Builder 4.7: The entity name must immediately follow the '&' in the entity reference.
- which probably means that ampersand is a special character, but how to solve this (probably frequent) problem?
TestApp.mxml:
<?xml version="1.0" encoding="utf-8"?>
<s:ViewNavigatorApplication
xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark"
firstView="views.Home"
applicationDPI="160">
</s:ViewNavigatorApplication>
views/Home.mxml:
<?xml version="1.0" encoding="utf-8"?>
<s:View xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark"
title="How to enable Login button?">
<s:layout>
<s:VerticalLayout paddingTop="8"
horizontalAlign="center" gap="8" />
</s:layout>
<s:Label text="Username:" />
<s:TextInput id="_username" />
<s:Label text="Password:" />
<s:TextInput id="_password" />
<s:Button id="_login"
label="Login"
enabled="{_username.text.length > 0 && _password.text.length > 0}" />
</s:View>