Pass element ID to Javascript function

Question

I have seen many threads related to my question title.

Here is HTML Codes :

Answer 1

In jsFiddle by default the code you type into the script block is wrapped in a function executed on window.onload:

Because of this, your function myFunc is not in the global scope so is not available to your html buttons. By changing the option to No-wrap in as Sergio suggests your code isn't wrapped:

and so the function is in the global scope and available to your html buttons.