With form validation: why onsubmit=“return functionname()” instead of onsubmit=“functionname()”?

Question

The question is pretty self-explanatory. I don\'t understand what the return is doing in the following code:

Answer 1

An extension to what GenericTypeTea says - Here is a concrete example:

The above form will not submit, whereas...

...does nothing, i.e. the form will submit.

Without the return, onsubmit doesn't receive a value and the event is executed just like without any handler at all.