That's a hard one without knowing exactly what's going on. You need to be able to find the JS object, so you either need to understand the DOM structure that results from your HTML or else give the thing you want to find a unique name or id. In the example you gave, the object is found because it's a member of the same form with a specific name.
Are you adding one button that selects the first code area, or a button attached to each code area?
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