Why can't I use "this" inside the inner function?

I am new to JavaScript. I have the following script working, var navRef = this.navigator; function onSearch( templateName) { navRef.onSearch(); } but not the one below and I am trying to understand why? Any help is appreciated. (navigator is sent as an argument to this object). function onSearch( templateName) { this.navigator.onSearch(); }
It's not possible to answer until you show us how you call onSearch and where you define your code. I suggest you create a jsfiddle.net demo.

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