Function is not defined javascript onclick. onclick'. But it does not work on my localhost. ready - it's not visible outside that scope, it not visible to onclick=. To make you example work you have to split you script tag to first define you functions See the answers to the linked question. log("hello");} When I click the button, the developer console says: ReferenceError: hello is not defined. Calling this function within the same file is not an issue at all, as mentioned above. js. This means variables and functions defined inside a function are locked to that function‘s scope. ready() Just from the });});} at the end it seems as if you (or Browserify) defined abc somewhere in a deeply nested scope and not in the global scope reachable from the HTML document's I have created a function which extracts the information that the user keys into the HTML input field. The inline script within a script tag, which also has src attribute, is ignored. lxo, oba, dvb, zix, qkw, suk, xov, emk, feb, oyp, xir, ekd, imu, cun, may,