Question

Suppose that we have:

<input type="button" name="button" value="Validate Payment" onclick="Validate()" />

We can put in the onclick:

1. onclick="Validate"
2. onclick="Validate()"
3. onclick="Validate();"

My question is what is the difference between these 3 implementation

Answer 1

1. Will not execute the function, it will return the function (try: console.log(Validate))
2. Will execute the function.
3. Will, exactly like #2, execute the function.

So there’s no difference between #2 and #3, functionally.

Please note that inline event handlers are bad practice, like mentioned in this comment by jbabey.