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[Javascript] Please help: problem with Javascript 'this' keyword in nested objects!
- From: javascript@xxxxxxxxxx (Amanda Birmingham)
- Subject: [Javascript] Please help: problem with Javascript 'this' keyword in nested objects!
- Date: Fri, 26 Apr 2002 10:17:21 -0600
Hello, List, I apologize to anyone who has seen this question on the wdvltalk list, but I'm desperate for an answer in short order ... I am having a serious *issue* with the @#$%& 'this' keyword. Basically, I have a setup like this: I have two types of objects defined. Object1 has a constructor that defines some methods for Object1, and these methods use the 'this' keyword to refer to properties of Object1. Object2 has a constructor that creates a new instance of Object1 as one of its properties. The Object2 then attempts to use one of the methods of its new Object1 property by calling "this.Object1.methodName". Which flunks. It flunks because methodName uses the "this" keyword inside it, and expects "this" to refer to an object of type Object1. Unfortunately, for reasons I totally cannot fathom, when I call methodName as described above, the "this" it is using is the "this" for Object2 (the outside one). Of course, Object2 doesn't have a bunch of properties that Object1 does, so methodName flunks. Why the heck is this happening?! (I have verified that it actually *is*). How do I write my methods to access the properties of their immediate "parent", rather than the properties of the object that ultimately invoked them?? (short of using "this.Object1" in place of "this" in methodName, which is not an option because it makes Object1 completely un-reusable.) I hope I've managed to describe the issue in a way that is at least somewhat clear--if not, please let me know and I can send pseudocode. Any suggestions would be REALLY welcome, as this problem is keeping me from getting anything done until I know how to get around it! Thanks as always, Amanda Birmingham Web Application Developer
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