MACROMEDIA COLDFUSION MX 7.0.2-USING COLDFUSION MX WITH FLEX 2 Guia do Utilizador descarregar pdf (Página 198)

198 Debug an Application

Add a calculation function

An ActionScript function is used to capture the input from these controls, and calculate the

exchange rate.

1. In the MXML editor's Source mode, enter the following public variable and function, so

that your application looks like the following:

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

<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"

layout="absolute">

<mx:Script>

<![CDATA[

[Bindable]

public var Currency:Array = ["US Dollars", "Euro"];

private function calculate():void {

if (cb_amount.selectedItem == "US Dollars") {

var a:Number = Number(txt_A.text);

var c:Number = (a * 0.798072);

txt_B.text = String(c);

txt_currency.text = "Euro";

} else if (cb_amount.selectedItem == "Euro") {

var b:Number = Number(txt_A.text);

var d:Number = (b * 1.25302);

txt_B.text = String(c);

txt_currency.text = "US Dollars";

} else {

txt_currency.text = "Enter an amount and select a

currency";

}

]]>

</mx:Script>

<mx:Label x="10" y="40" text="Enter amount"/>

<mx:TextInput id="txt_A" x="95" y="40" width="100"/>

<mx:ComboBox x="210" y="40" id="cb_amount" dataProvider="{Currency}"

prompt="Select currency..." width="150"/>

<mx:TextInput id="txt_B" x="95" y="80" width="100" editable="false"/

<mx:Text id="txt_currency" width="100" x="210" y="80"/>

<mx:Button id="btn_calculate" click="calculate();" x="95" y="140"

label="Calculate" width="100"/>

</mx:Application>

The array variable provides selections for the ComboBox control and the Calculate function is

called when the button is clicked.

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MACROMEDIA COLDFUSION MX 7.0.2-USING COLDFUSION MX WITH FLEX 2 Guia do Utilizador Página 198