Learning ActionScript 2.0 in Adobe Flash 
Learning ActionScript 2.0 in Adobe Flash |
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| Best Practices and Coding Conventions for ActionScript 2.0 > ActionScript coding conventions > Handling scope > Avoiding absolute targets (_root) | |||
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You can use several methods to target instances that let you avoid using _root; these methods are discussed later in this section. Avoid using _root in ActionScript 2.0 because SWF files that load into other SWF files might not work correctly. The _root identifier targets the base SWF file that is loading, not the SWF file using relative addressing instead of _root. This issue limits code portability in SWF files that are loaded into another file, and, particularly, in components and movie clips. You can help resolve problems by using _lockroot, but only use _lockroot when necessary (such as when you are loading a SWF file but do not have access to the FLA file). For more information on using _lockroot, see Using _lockroot.
Use this, this._parent, or _parent keywords rather than _root, depending on where your ActionScript 2.0 code is located. The following example shows relative addressing:
myClip.onRelease = function() {
trace(this._parent.myButton._x);
};
All variables must be scoped, except for variables that are function parameters, and local variables. Scope variables relative to their current path whenever possible, using relative addressing, such as the this property. For more information on using the this property, see this property in the ActionScript 2.0 Language Reference.
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