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

Returning false from the function will stop the event continuing. I.e. it will stop the form submitting.

i.e.

function someFunction()
{
    if (allow) // For example, checking that a field isn't empty
    {
       return true; // Allow the form to submit
    }
    else
    {
       return false; // Stop the form submitting
    }
}