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How does js stop php script running if login is not valid


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Hi

I am a complete newbie with js and I am struggling with OOP ass well.  I can't get my head around how login.php is blocked if the js validation fails.  I can see that the js will return FALSE, but how does this stop the form being submited by the php script?  I hope this question makes sense.

Thanks and kind regards,

Santilal

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