MACROMEDIA FLASH 8-EXTENDING FLASH Bedienungsanleitung PDF herunterladen (Seite 13)

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Linking a Combo Box to a List Box

In this section you will link the Combo Box to a List Box, so that only the

products for the selected category display in the List Box. This is where

you will learn to handle the “change event” on the Combo Box.

Steps

1. Return to RemoteCatalog.fla in the war directory.

Adding a Flash MX Component to the Stage

2. Expand the Components panel. Click Window Æ Components if not

open already.

3. Select Flash UI Components.

4. Drag an instance of the ListBox component just below the Products

per Category text on the stage.

5. Use the Free-Transform tool or the Properties panel to resize it.

6. In the Properties pane, give the ListBox an instance name of

products_lb.

Handling a Change Event in Flash MX

7. Open the Actions panel for frame 1 of the Actions layer (press F9).

8. At the bottom of the code, specify the name of the change handler

function for the category_cb ComboBox. Give it the name

productsByCategory, as follows:

category_cb.setChangeHandler("productsByCategory");

9. In the functions section, create the event handler function that will be

invoked when a category is selected, as follows:

 Declare a function named productsByCategory

function productsByCategory() {}

 In the body of the function, declare a variable category and assign

to it the value selected from the ComboBox. The getValue()

method returns the data associated with the selected label:

var category = category_cb.getValue();

 Invoke the getProductsByCategory(int catId) method of the

RemoteCatalog class, passing category as the parameter. Use the

catalogService object you already created:

catalogService.getProductsByCategory(Number(catego

ry));

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MACROMEDIA FLASH 8-EXTENDING FLASH Bedienungsanleitung Seite 13