Check out example codes for "Uncaught ReferenceError: function is not defined at HTMLUnknownElement.onclick". It will help you in understanding the concepts better.

Code Example 1

//Your program can't find the function so do this.

//You can assign the button onclick as an id.
//then attach an eventListener on run time like this:

<button id="btn">Click me!</button>

var btn = document.getElementById("btn");
btn.addEventListener("click", function() {
	//Do something here
}, false);

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