MACROMEDIA FLEX-GETTING STARTED WITH FLEX Uživatelský manuál stáhnout pdf (Strana 40)

dler(event). The photoHandler event packages the serv-

ice results. We will create the {{photoHandler}} function

later.

Example 3-2 shows the relevant code.

Example 3-2. The HTTPService control

<mx:HTTPService id="photoService"

url="http://api.flickr.com/services/feeds

/photos_public.gne"

result="photoHandler(event)"/>

Now it’s time to create a bindable XML variable in ActionScript

3.0. To do so, follow these steps:

1. Before the HTTPService component, add a Script com-

ponent by typing <mx:Script>. Flex Builder completes

the tag for you. Alternatively, you can place the Script

component after the HTTPService component, as shown

in Example 3-3.

Example 3-3. The blank script tag

<mx:Script>

<![CDATA[

]]>

</mx:Script>

2. In the mx:Script block, enter

import mx.collections.ArrayCollection. ArrayCollec

tion is the type of object that is used as a data provider.

The relevant code is shown in Example 3-4.

Example 3-4. The first import statement

<mx:Script>

<![CDATA[

import mx.collections.ArrayCollection;

]]>

</mx:Script>

3. After the ArrayCollection import statement, enter

import mx.rpc.events.ResultEvent to import the Resul

tEvent class. The ResultEvent class is the type of event

24 | Chapter 3: Flex 101: Step by Step

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