Submit the form only if email is valid

Question

I need a way to submit a form only if email is valid. If email is NOT valid then show ONLY an alert ( below you can see my code ).

JAVASCRIPT:

 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 re.test(email);
 } 


 function continueornot() {
    if(validateEmail(document.getElementById('emailfield').value)){
    // ok
    }else{ alert("email not valid"); return false;}
 }

HTML:

<form method="post" action="register.php" enctype="multipart/form-data">
<table>
<tr><td>Email:</td></tr>
<tr><td><input type="text" size="30" name="email" id="emailfield"> </td></tr>
<tr><td>Password:</td></tr>
<tr><td><input type="password" size="30" name="password"> </td></tr>
</table>
<input name="steptwo" value="Create Account" type="submit" onclick="continueornot();"/>
</form>

The problem is that the form is submitted even if the email is NOT valid.

How can I resolve this problem ?

Answer 1

You should attach return continueornot(); to the onsubmit event of the form, not the button's click event.

See this fiddle: http://jsfiddle.net/NdSmu/

Answer 2

You need the return value.

function continueornot() {
    if(validateEmail(document.getElementById('emailfield').value)){
      // ok
      return true;
    }else{ alert("email not valid"); return false;}
 }


onclick="return continueornot();"