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My First Flex Application

For this article I used Flex 2 beta3. Since then Flex 2 has been released so you should download that

We'll walk through the following steps to write our first Flex application.

  1. Install the free Eclipse integrated development environment
  2. Install the Flex Builder 3 plug-in for Eclipse
  3. Write the application
  4. Test/debug the application
When you set out to write your first Flex application you'll have to choose what tool you'll use to write it with. Currently the most popular tool to use is the free Eclipse IDE. If you don't have Eclipse installed go to http://www.eclipse.org/ to install it. You'll need to install Eclipse 3.1 to use Flex 2 Beta 3.

Select the Downloads link
Select the Eclipse SDK 3.1.2 for Windows to download, if you have Windows.

Eclipse can be used with many operating systems. I'll be using Windows XP with the Sun Java 2 Standard Edition Platform version 1.4.2_08 for Microsoft Windows. See the Eclipse readme_eclipse.html for more information.

Figure 1

There are various plug-ins available for Eclipse. There's a Flex plug-in we'll install so we can use Eclipse to write our Flex app. The Eclipse plug-in for Flex is included in the Flex download. Go to http://labs.adobe.com/ to download the Flex 2.0 Beta 3.

Open the Eclipse IDE by clicking the Eclipse icon.

Figure 2

Eclipse will ask you where you want your workspace to be located. Just leave it in the default directory for now. Press OK.

Figure 3

We have to install the Flex Plug-in into Eclipse. I downloaded the Flex Builder 2 Beta 3 and selected the install option.

I'll choose the Flex Builder plug-in and Flex SDK option to install Flex Builder as an Eclipse plug-in.

Figure 4

Press the Unpack button to unpack to a temporary installation area.

Figure 5

Press the Next button.

Figure 6

Accept the license.

Figure 7

Accept the default directory to install the Flex Framework.

Figure 8

The My Eclipse folder is in my desktop, so that's where I installed the Flex plug-in.

Figure 9

After you press OK, the path to the Eclipse plug-in is entered. Press Next.

Figure 10

You'll have to install Flash Player 9.0 to view applications developed with Flex 2 for the browser of your choice.

Figure 11

Check your pre-installation summary to verify that everything is correct then press the Install button.

Figure 12

Once installed, you'll get a message that the software has been successfully installed.

Figure 13

Open the Eclipse program. Make a note of the default workspace where Eclipse will be looking for your applications or choose a directory where you want Eclipse to look for your applications.

Figure 14

To verify that the Flex Builder 2 Beta 3 plug-in was installed, select Help/Software Updates/Manage Configurations.

Figure 15

You should see the Flex Builder 2 Beta 3 plug-in zorn.feature.core 2.0.340.

Figure 16

Open a new project in Eclipse.

Figure 17

Under Flex, select Flex Project and press the Next button.

Figure 18

We won't use any Flex server technology for this application, so select the Basic radio button and press the Next button.

Figure 19

Name the project and press the Finish button. I called mine MyFirstFlex2Beta3App.

Figure 20

Enter the Flex Builder 2.0 serial number or select Try to try Flex Builder.

Figure 21

Select OK to switch to the Flex Development Perspective.

Figure 22

Flex defaults to the Source view. Select the Design tab to switch to the Design view.

Figure 23

In the Design view locate the Panel component under the Components tab on the lower left and drag the Panel to the stage.

Figure 24

In the Flex Properties tab on the lower right, type in myPanel next to the id field under the General area. Next, locate the ControlBar component on the lower left and drag it to the bottom of the Panel.

Figure 25

Next to the id in the Flex Properties type myControlBar in the General area.

Figure 26

Locate the Button component under the Controls folder on the lower-left Components tab. Drag the Button component and put it over the ControlBar component.

Figure 27


More Stories By Mary McDonald

Mary McDonald has served the last four years as the Northern Indiana Adobe Users Group Manager (see www.ninmug.org), has attended many conferences including CFUNITED, MAX, MXNorth and TodCon. Out of her 16 years working as a software developer, Mary has worked the last 6 years with ColdFusion, SQL, Flash, and Flex and is a Certified 5.0 ColdFusion Developer. Mary's other interests include music, photography, traveling, dogs, and most recently Tai Chi.

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Most Recent Comments
George Lu 09/15/06 01:54:00 AM EDT

Thanks! That's what I want. The original code with 'srv.result.catalog.product' has error. But where does 'lastResult' come from?

>>> QUOTE:
-FYI-
DataGrid Syntax Error: For me to get the app to work, I needed to change the mx:DataGrid tag to

bigbadken 09/06/06 11:06:57 AM EDT

Catalog.xml: It's located in the samples folder under the Flex Builder 2 Plug-in folder. For me, that was

C:\Program Files\Adobe\Flex Builder 2 Plug-in\Flex SDK 2\samples\flexstore\data\catalog.xml.

-FYI-
DataGrid Syntax Error: For me to get the app to work, I needed to change the mx:DataGrid tag to

<mx:DataGrid width="100%" height="100%" dataProvider="{srv.lastResult.catalog.product}"/>

Greg C 09/04/06 05:28:19 PM EDT

I can not find the Catalog.xml that I am suppose to copy to the BIN folder. The quote below says that it is currently in my Application folder.... nope... it is not... in fact I don't even have a bin folder. The walk through has be great until now when it refenced a file I can't find. Please send me the file... or let me know where I can download it, etc.

>>> QUOTE:
Next, we will add some data to our panels using the HTTPService command to read an XML file located currently in your application bin folder. Copy the Catalog.xml file to your application's bin folder.

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