ActionScript 2.0 Components Language Reference 
ActionScript 2.0 Components Language Reference |
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Flash Player 6 (6.0.79.0).
Flash MX 2004.
Usage 1:
var listenerObject:Object= new Object();listenerObject.click = function(eventObject:Object) {// ...};checkBoxInstance.addEventListener("click",listenerObject);
Usage 2:
on (click) {
// ...
}
Event; broadcast to all registered listeners when the mouse is clicked (released) over the check box, or if the check box has focus and the Spacebar is pressed.
The first usage example uses a dispatcher-listener event model. A component instance (checkBoxInstance) dispatches an event (in this case, click), 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. The event object has properties that contain information about the event. You can use these properties to write code that handles the event. Finally, you call the addEventListener() method (see EventDispatcher.addEventListener()) 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.
For more information, see EventDispatcher class.
The second usage example uses an on() handler and must be attached directly to a CheckBox instance. The keyword this, used inside an on() handler attached to a component, refers to the component instance. For example, the following code, attached to the check box myCheckBox, sends "_level0.myCheckBox" to the Output panel:
on (click) {
trace(this);
}
The following example enables a button when the check box is selected. This example assumes you have a Button component instance on the Stage with instance name submit_button, and a CheckBox component instance on the Stage with the instance name agree_ch. Add the following code to the first frame of the main timeline:
agree_ch.label = "I agree";
submit_button.enabled = false;
// Create Listener Object.
var form_obj:Object = new Object();
// Assign function to Listener Object.
form_obj.click = function(event_obj:Object) {
submit_button.enabled = event_obj.target.selected;
};
// Add Listener.
agree_ch.addEventListener("click", form_obj);
The following code sends a message to the Output panel when checkBoxInstance is clicked. The on() handler must be attached directly to checkBoxInstance:
on (click) {
trace("check box component was clicked");
}
EventDispatcher.addEventListener()
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