javascript - Proper way of invoking a function to validate data before submitting a form -

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in understanting, have 2 options this:

a) on html form, assign function on "onsubmit" attribute, , use function return false if goes wrong. submitting form, submit-type button can used.

b) have non-submit button, triggers javascript function on-click; then, function, "form.submit();" call , force submition.

is there practical difference between these 2 methods / prefered method of doing this? pro - cons, etc? now, see them being matter of taste,but if there's functional difference might come handy knowing it!

thanks lot

you may use "onchange" event listener not allowing enter invalid data in form


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