Why is my Javascript form validation not working properly? -

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why validation failing on second attempt here? on first attempt validation works fine, on second run, accept inappropriate values in email field. first 2 fields work fine, third field accept text after first run. validates if change value in email field, otherwise keep displaying error , failing validate should. 

function validate(){      clearerrors();      var errorflag = true;      var name = document.getelementbyid("name");      nameval = name.value;      if(nameval.length === 0){          var nameerror = document.getelementbyid("nameerror");          nameerror.style.display = "block";          errorflag = false;     }      var phone = document.getelementbyid("phone")      var phoneval = phone.value;      if(isnan(phoneval) || (phoneval < 1000000000 || phoneval >10000000000)){          errorflag = false;          var phoneerror = document.getelementbyid("phoneerror");          phoneerror.style.display = "block";     }        var email = document.getelementbyid("email");      var emailval = email.value;      var restr = "^[a-z0-9._%+-]+@[a-z0-9.-]+\.[a-z]{2,}$";      if((restr.match(emailval))){          errorflag = false;          var emailerror = document.getelementbyid("emailerror");          emailerror.style.display = "block";     }      return errorflag; }  function clearerrors(){      var nameerror = document.getelementbyid("nameerror");      nameerror.style.display = "none";      var phoneerror = document.getelementbyid("phoneerror");      phoneerror.style.display = "none";      var emailerror = document.getelementbyid("emailerror");      emailerror.style.display = "none";  }

your validator fail on email, because feeding string .match, when needs regex.

you have call .match on email itself, regex argument.

you need negate return value check if not match, or use .test.

this bit:

var restr = "^[a-z0-9._%+-]+@[a-z0-9.-]+\.[a-z]{2,}$"; if((restr.match(emailval))){

should replaced with:

var re = /^[a-z0-9._%+-]+@[a-z0-9.-]+\.[a-z]{2,}$/i; if(!emailval.match(re)){

of if can't use regex literal reason:

var re = new regexp("^[a-z0-9._%+-]+@[a-z0-9.-]+\.[a-z]{2,}$", "i"); if(!emailval.match(re)){

or using .test instead of .match:

var re = /^[a-z0-9._%+-]+@[a-z0-9.-]+\.[a-z]{2,}$/i; if(!re.test(emailval)){

note i case-insensitive matching, emails don't have entered in all-caps.


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