MACROMEDIA FLEX-FLEX ACTIONSCRIPT LANGUAGE Manual do Utilizador descarregar pdf (Página 48)

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Flex – Data Binding

This chapter describes the Data Binding concepts.

What is Data Binding?

ata Binding is a process in which data of one object is tied to another object. Data binding requires a

source property, a destination property and a triggering event which indicates when to copy the data from source to

destination.

Flex provides three ways to do Data Binding

 Curly brace syntax in MXML Script ({})

 <fx:binding> tag in MXML

 BindingUtils in ActionScript

Data Binding - Using Curly Braces in MXML

Following example demonstrates using curly braces to specify data binding of a source to destination.

<s:TextInput id="txtInput1"/>

<s:TextInput id="txtInput2" text = "{txtInput1.text}"/>

Data Binding - Using <fx:Binding> tag in MXML

Following example demonstrates using <fx:Binding> tag to specify data binding of a source to destination.

<fx:Binding source="txtInput1.text" destination="txtInput2.text" />

<s:TextInput id="txtInput1"/>

<s:TextInput id="txtInput2"/>

Data Binding - Using BindingUtils in ActionScript

Following example demonstrates using BindingUtils to specify data binding of a source to destination.

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MACROMEDIA FLEX-FLEX ACTIONSCRIPT LANGUAGE Manual do Utilizador Página 48