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09/23/2009 at 06:10AM PDT, ID: 24754723

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9.1

Javascript Alert showing blank message

Asked by geoffcoles in JavaScript Frameworks

Tags: Javscript

I am writing a series of functions which should do the following:

1. check and validate the submitted numeric values,
2. post them to the server
3. return and display the AJAX response from the server as an alert window.
4. refresh the opener window
5. close the current window.

The code works fine except that the alert window in the function stateChangedref() displays as a blank message. As soon as I remove the lines "window.opener.location.reload();" and "window.close();" from the ssubmissionvalid(str) function, then the alert displays the message from the server with no problems.

I would be grateful for any help with this. Thanks!

View the Solution FREE for 30 Days

         
           
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             function getXMLHTTPRequest()
{
var req = false;
try
  {
   req = new XMLHttpRequest(); /* e.g. Firefox */
  }
catch(err1)
  {
  try
    {
     req = new ActiveXObject("Msxml2.XMLHTTP");  /* some versions IE */
    }
  catch(err2)
    {
    try
      {
       req = new ActiveXObject("Microsoft.XMLHTTP");  /* some versions IE */
      }
      catch(err3)
        {
         req = false;
        }
    }
  }
return req;
}
 
 
 
 
 
 
 
function issubmissionvalid(str)
// Ajax code which posts values to getrefno.php
{
   xmlHttp=getXMLHTTPRequest()
   if (xmlHttp==null)
   {
       alert ("Browser does not support HTTP Request");
       return;
   }
  var dbaction = str;
  var refnosubmitted = document.forms['newrefdetails'].elements['refno'].value;
  var apptypesubmitted = document.forms['newrefdetails'].elements['apptype'].value;
  var refstartsubmitted = document.forms['newrefdetails'].elements['refstart'].value;
  var refendsubmitted = document.forms['newrefdetails'].elements['refend'].value;
  //alert ("the values submitted are: a=" + apptypesubmitted + " b=" + refstartsubmitted + " c=" + refendsubmitted);
  url='getrefno.php'+"?a="+ apptypesubmitted + "&b=" + refstartsubmitted + "&c=" + refendsubmitted +"&d=" + refnosubmitted + "&e=" + dbaction;
  url=url+"&sid="+Math.random();
  xmlHttp.onreadystatechange=stateChangedref;
  xmlHttp.open("GET",url,true) ;
  xmlHttp.send(null);
   
}
 
 
function stateChangedref()
{
   if (xmlHttp.readyState==4 )
   {
           var mystring = xmlHttp.responseText;
           alert (mystring);
   }
   else { }
}
 
 
 
 
 
 
function confirmupdate(str)
//this function acts as a confirmation request to check if the user really wants to update the reference number
{
var errornum = 0;
 
if (IsNumeric(document.forms['newrefdetails'].elements['refstart'].value) == false)
{errornum = (errornum + 1);}
if (IsNumeric(document.forms['newrefdetails'].elements['refend'].value) == false)
{errornum = (errornum + 1);}
if (errornum > 0)
{alert ("Check that the values you entered are valid numbers and try again");
}
 
else
{
input_box=confirm("ARE YOU SURE YOU WISH TO CONTINUE?  .... Click 'OK' to update the record or click 'Cancel' to cancel the update");
    if (input_box==true)
    {
    issubmissionvalid(str);
        window.opener.location.reload();
        window.close();
    }
 
    else
    {
    // Output when Cancel is clicked
    alert ("The update has been cancelled");
    return false;
    }
    }
}
 
 
function IsNumeric(strString)
   //  check for valid numeric strings
   {
   var strValidChars = "0123456789";
   var strChar;
   var blnResult = true;
   if (strString.length == 0) return false;
   //  test strString consists of valid characters listed above
   for (i = 0; i < strString.length && blnResult == true; i++)
      {
      strChar = strString.charAt(i);
      if (strValidChars.indexOf(strChar) == -1)
         {
         blnResult = false;
         }
      }
   return blnResult;
   }

           
         

20091111-EE-VQP-91 - Hierarchy / EE_QW_3_20080625

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2. sh0e70,850
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7. ziffgone10,500
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11. HonorGod8,150
12. azadisaryev7,500
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14. objects6,000
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21. agdub4,000
21. christoph...4,000
21. heimidal4,000

Javascript Alert showing blank message

Asked by geoffcoles in JavaScript Frameworks

Tags: Javscript

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