How Do I Know I Insert The Onchange Correctly Into My Form?

I inserted a onChange trigger into my selection that generated by php. But my final result is not responding on the onChange function which runs perfectly in pure html and javascri

Solution 1:

In firefox or chrome you can use console.log('rock on!') to see if your onChange event is called.

You'll need Firebug in firefox or the console explorer in Chrome to see the result

Alternatively, you couls only use alert('here'); to see if your code runs.