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I’ve done this :
http://jsfiddle.net/CS273/4/
On this fiddle, when the mouse reaches the right area of the text input, it changes the cursor (pointer) and creates a click event listener.
When the mouse gets out of the right area, this same event listener is destroyed.
I would call that “on the fly” event listener binding, perhaps it already has a name.
Is it a good thing to do that or not ?
All things being equal, you’ll probably never notice a performance hit, but this is a somewhat odd way to do what you want.
I’d suggest re-working your HTML so that the ‘x’ isn’t part of the input and you can just attach a normal event handler.
example: http://jsfiddle.net/cwolves/CS273/6/