ActionScript 2.0 Components Language Reference
ComboBox component > ComboBox.open

ComboBox.open

Availability

Flash Player 6 (6.0.79.0).

Edition

Flash MX 2004.

Usage

var listenerObject:Object = new Object();
listenerObject.open = function(eventObject:Object) {
    // Your code here.
};
comboBoxInstance.addEventListener("open", listenerObject)

Description

Event; broadcast to all registered listeners when the drop-down list is completely open.

Using the dispatcher/listener event model, a component instance (comboBoxInstance) dispatches an event (in this case, open) and the event is handled by a function, also called a handler, on a listener object (listenerObject) that you create. You define a method with the same name as the event on the listener object; the method is called when the event is triggered. When the event is triggered, it automatically passes an event object (eventObject) to the listener object method. Each event object has properties that contain information about the event. You can use these properties to write code that handles the event. For more information, see EventDispatcher class.

Finally, you call the addEventListener() method on the component instance that broadcasts the event to register the listener with the instance. When the instance dispatches the event, the listener is called.

Example

With a ComboBox component instance my_cb on the Stage, the following example sends a message to the Output panel when the drop-down list opens or closes:

// Add Items to List.
my_cb.addItem({data:1, label:"First Item"});
my_cb.addItem({data:2, label:"Second Item"});

// Create Listener Object.
var cbListener:Object = new Object();
cbListener.open = function(evt_obj:Object) {
 trace("The ComboBox has opened.");
}
cbListener.close = function(evt_obj:Object){
   trace("The ComboBox has closed.");
}

// Add Listener.
my_cb.addEventListener("open", cbListener);
my_cb.addEventListener("close", cbListener);

// Open the combo box.
my_cb.open();

See also

ComboBox.close, EventDispatcher.addEventListener()

View comments on LiveDocs