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03.06.2008 at 02:07AM PST, ID: 23218955
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Attachment Details

Registration form check if username already exists

Asked by leapingleon in JavaScript

Tags: Javascript, AJAX

Hi All

I want to register a new user, and check if the email they are entering already exists in the DB. This works perfectly in IE, but not at all in FX. The place where I found the code said it worked in both browsers, but only tested it now in FX, and cant seem to find where I found the code.

Any ideas?

Thanks

EDIT: With IE the popup comes up when an email exists, but with FX it just submits the form, even if I change it to return false at the end of the OnSubmit function. This is telling me that FX does not like something in the Javascript, but I dont know what.Start Free Trial 
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<script language="javascript">
 
function OnSubmit(f) {
			
  checkUsername();
  
  if (document.getElementById("email_ok").value == 'no')
  {
	  alert("The email address you entered already exists. Please use another email address.");
	  document.getElementById("email").value = "";
	  document.getElementById("confirm_email").value = "";
	  document.getElementById("email_ok").value = "";
	  document.getElementById("email").focus();
	  return false;
  } 
	  
  return true;
  
}
 
function checkUsername()
{
      var username_field = document.getElementById("email");
 
      if (username_field.value == "")
      {
            username_field.focus();
      }
      else
      {
            xmlRequest = getXmlHttpObject();
 
            if (xmlRequest == null)
            {
                  // Browser does not support HTTP request
                  alert ("To use this feature, please upgrade to a current web browser");
            }
 
            var url = "Check_Email.php?username="+username_field.value;
 
            xmlRequest.onreadystatechange=stateChanged;
            xmlRequest.open("GET",url,true);
            xmlRequest.send(null);
      }
}
 
function stateChanged()
{
      // Only process if the response is complete
      if (xmlRequest.readyState==4 || xmlRequest.readyState=="complete")
      {
            var responseValue = parseInt(xmlRequest.responseText);
 
            if (responseValue == -1)
            {
                  alert("An error occured while checking your email. Please try again.");
            }
            else if (responseValue == 0)
            {
                  document.getElementById("email_ok").value = "yes";
            }
            else
            {
                  document.getElementById("email_ok").value = "no";
            }
      }
}
 
function getXmlHttpObject()
{
      var objXH=null;
      if (window.XMLHttpRequest)
      {
            objXH=new XMLHttpRequest();
      }
      else if (window.ActiveXObject)
      {
            objXH=new ActiveXObject("Microsoft.XMLHTTP");
      }
      return objXH;
}
 
</script>
[+][-]03.06.2008 at 06:42AM PST, ID: 21060568

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[+][-]03.06.2008 at 07:54AM PST, ID: 21061442

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[+][-]03.06.2008 at 08:14AM PST, ID: 21061719

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About this solution

Zone: JavaScript
Tags: Javascript, AJAX
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Solution Provided By: MacAnthony
Participating Experts: 1
Solution Grade: A
 
 
[+][-]03.06.2008 at 08:33AM PST, ID: 21061958

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[+][-]03.06.2008 at 08:53AM PST, ID: 21062209

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[+][-]03.06.2008 at 08:57AM PST, ID: 21062264

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[+][-]03.06.2008 at 09:13AM PST, ID: 21062467

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[+][-]03.06.2008 at 09:19AM PST, ID: 21062531

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