_alpha (MovieClip._alpha property)

public _alpha : Number

The alpha transparency value of the movie clip. Valid values are 0 (fully transparent) to 100 (fully opaque). The default value is 100. Objects in a movie clip with _alpha set to 0 are active, even though they are invisible. For example, you can still click a button in a movie clip whose _alpha property is set to 0. To disable the button completely, you can set the movie clip's _visible property to false.

You can extend the methods and event handlers of the MovieClip class by creating a subclass.

Availability: ActionScript 1.0; Flash Player 4

Example

The following code sets the _alpha property of a dynamically created movie clip named triangle to 50% when the mouse rolls over the movie clip. Add the following ActionScript to your FLA or AS file:

this.createEmptyMovieClip("triangle", this.getNextHighestDepth());

triangle.beginFill(0x0000FF, 100);
triangle.moveTo(10, 10);
triangle.lineTo(10, 100);
triangle.lineTo(100, 10);
triangle.lineTo(10, 10);

triangle.onRollOver = function() {
    this._alpha = 50;
};
triangle.onRollOut = function() {
    this._alpha = 100;
};

The MovieClip.getNextHighestDepth() method used in this example requires Flash Player 7 or later. If your SWF file includes a version 2 component, use the version 2 components' DepthManager class instead of the MovieClip.getNextHighestDepth() method.

_alpha (MovieClip._alpha property)

Example

See also