MACROMEDIA FLEX-GETTING STARTED WITH FLEX User Manual download pdf (Page 43)

5. In the function, cancel any previous requests to photo

Service by using the cancel method. The instance name

of the HTTPService component is photoService.

6. Create an Object variable named params.

7. Create a format parameter of the params variable with a

value of rss_200_enc. This value tells Flickr how to pack-

age the response.

8. Create a tags parameter of the params variable with a

value of searchTerms.text. This is the value that was en-

tered in the search field.

9. Send the request and params variable to Flickr by using

the send method of photoService. Example 3-8 shows

the complete function.

Example 3-8. The complete requestPhotos function

<mx:Script>

<![CDATA[

import mx.collections.ArrayCollection;

import mx.rpc.events.ResultEvent;

[Bindable]

private var photoFeed:ArrayCollection;

private function requestPhotos():void{

photoService.cancel();

var params:Object = new Object();

params.format = 'rss_200_enc';

params.tags = searchTerms.text;

photoService.send(params);

}

]]>

</mx:Script>

Now it’s time to create the HTTPService result handler and to

populate the photoFeed XML variable:

1. After the requestPhotos() function, create a private

function named photoHandler and pass an event of type

ResultEvent to the function. The return type is void. The

photoHandler handles the response from the HTTPSer

A Flickr Viewer | 27

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MACROMEDIA FLEX-GETTING STARTED WITH FLEX User Manual Page 43