javascript - Validate email with jQuery

Question

I have input name="email" and a button on the page.

How do I validate this input in live for a valid email address? And add some class for a button, class "active" if it is valid or "inactive".

This is a small task, so I don't want to use a plugins.

Thanks

Answer 1

I usually use this javascript function to validate in frontend:

function validateEmail(email) 
{ 
 var re = /^(([^<>()[]\.,;:s@"]+(.[^<>()[]\.,;:s@"]+)*)|(".+"))@(([[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}])|(([a-zA-Z-0-9]+.)+[a-zA-Z]{2,}))$/ 
 return email.match(re) 
}

it returns true or false. But anyway, you shouldn't usually only validate sensitive data in the frontend, but also on the server side.