How to prevent signup using free email

**wvmlt** · 02-24-2005, 05:01 PM

I would like to prevent (or make it a little difficult) users signing up using yahoo or hotmail addresses. I have some javascript to check that the format of the email addy is correct, how can I modify it to not allow signups from yahoo and hotmail users? Heres my code:

PHP Code:


			
<TR> 

              <TD vAlign=top align=left width="29%" height=26><B>E-Mail Address:</B><BR> 

                &nbsp;</TD>

 



<script type="text/javascript">

<!--

String.prototype.frmEmail = function () {return /^[^x00-x20()<>@,;:".[\]\x7f-\xff]+(?:\.[^\x00-\x20()<>@,;:\\".[]x7f-xff]+)*@[^x00-x20()<>@,;:".[\]\x7f-\xff]+(?:\.[^\x00-\x20()<>@,;:\\".[]x7f-xff]+)+$/.test(this)}

// -->

</script>

              <TD vAlign=top align=left width="71%" height=26><input type="text" onchange="if (!this.value.frmEmail()) {alert ('That would not appear to be a valid email address.'); this.value=''; this.focus()}" size=34 name=frmEmail> 

                <BR>

                *Valid E-Mail address is required to activate account.</TD>

            </TR>

**Phaedrus** · 09:01 PM

I think you could just check for the strings 'yahoo' or 'hotmail' in the email address. So here's what you do:

put this inside the <head> tags:

Code:

<script type="text/javascript">
var reEMail=/^\w[\w\-\.]+\@\w[\w\-]+(\.\w[\w\-]+)+$/;

function _checkIt(re, field, msg, mode) {
  if (!re.test(field.value)) {
    _alertIt(msg, mode);

    if (field.select) {
      field.select();
    }
    if (field.focus) {
      field.focus();
    }

    return (mode && mode==1)?true:false;
  }

  return true;
}

function _alertIt(msg, mode) {
  if (mode) {
    totalAlert+=msg+"\n";
  }
  else {
    totalAlert="";
    alert(msg);
  }
}

function goodEMail(field, msg, mode) {
  if ((field.value.indexOf('yahoo') == -1) && (field.value.indexOf('hotmail') == -1))
  { 
  	return _checkIt(reEMail, field, msg, mode);
  }
  else
  {
  	alert('Yahoo and Hotmail accounts are not allowed');
  	this.value = '';
  	this.focus();
  	return false;
  }
}
</script>

Then call it like this:

onchange="return goodEMail(this,'That doesn\'t appear to be a valid email address')"

I can't take credit for the functions, they're from FormGuard at yxScripts.com. I just modified it to find 'yahoo' and 'hotmail'.

**wvmlt** · 02-25-2005, 06:05 AM

Thanks, I'll give it a shot.