How to validate an email address against free domain users

Question

Hi all,
I want to validate an email address so that only users of non free domains (let's say other than yahoo, hotmail, gmail, etc) can create an account in my apex application.
I want to place a validation on the "Registration Page" but I am not sure how to proceed from then on :(
Does anybody know how I can do this ?
Kind Regards,
Ana-Maria

Answer 1

Hi Ana-Maria,
You can do this on two places. You can do it on the client (using javascript) or you can do this on the database (using a trigger or a check constraint). The best way is to do both.
Use something like this for the javascript bit:
<script type="text/javascript">
function checkemail(){
  var email = $v('P4_EMAIL');
  //get index of @
  var x = email.indexOf('@');
  //get the string behind @
  var behind_amp = email.substring(x+1, email.length);
  //get the index of the .
  var y = behind_amp.indexOf('.');
  //filter out the provider
  var provider = behind_amp.substring(0, y);
  var result;
  // set all wrong providers in this case
  switch(provider){
    case 'hotmail': result=false;break;
    case 'yahoo': result=false;break;
    case 'gmail': result=false;break;
  // Check the result
  if (!result){
    //The provider is bad
    alert(provider + ' is not allowed!');
    //Keep the focus on the email field
    setTimeout(function(){$x('P4_EMAIL').focus();}, 5);
</script>Set the event to the onchange of the email field (in HTML Form Element Attributes):
onchange="checkemail();"Hope this helps,
Greetings Rutger