AJAX

getElementsByName() generates undefined ouput value in a textbox

Please support our JavaScript / DHTML / AJAX advertiser: PostgreSQL or MySQL? Compare and contrast the two most popular open source databases

•

Join Date: Aug 2007

Posts: 58

Reputation: rrocket is an unknown quantity at this point

Solved Threads: 0

rrocket

Offline

Junior Poster in Training

getElementsByName() generates undefined ouput value in a textbox

Sep 4th, 2007

I am passing a value through query string to a popup and then trying to pass it back to the main page... I store the value in a hidden input box

 Help with Code Tags 
 JavaScript / DHTML / AJAX Syntax (Toggle Plain Text) 
<input type="text" name="FromZip" id="FromZip" value="<% response.write(Request.QueryString("txtZipFr")) %>" />
<input type="text" name="FromZip" id="FromZip" value="<% response.write(Request.QueryString("txtZipFr")) %>" />

and am passing it back through query string to the main page with

 Help with Code Tags 
 javascript Syntax (Toggle Plain Text) 
<script language="JavaScript" type="text/javascript">
   //<!--
    //opener.location.reload(true);
   //window.opener.location='bl_zip_sngl.asp?
   var x;
   x = document.getElementsByName("FromZip").value;
   alert(x);
    window.opener.location='bl_zip_sngl.asp?txtZipFr='  +x
    self.close();
  // -->
</script>
<script language="JavaScript" type="text/javascript">
   //<!--
    //opener.location.reload(true);
   //window.opener.location='bl_zip_sngl.asp?
   var x;
   x = document.getElementsByName("FromZip").value;
   alert(x);
    window.opener.location='bl_zip_sngl.asp?txtZipFr='  +x
    self.close();
  // -->
</script>

It gives me undefined as the output, but when I do it like this

 Help with Code Tags 
 javascript Syntax (Toggle Plain Text) 
<script language="JavaScript" type="text/javascript">
   //<!--
    //opener.location.reload(true);
   //window.opener.location='bl_zip_sngl.asp?
   var x;
   document.getElementsByName("FromZip").value = 79797; //Only difference
   x = document.getElementsByName("FromZip").value;
   alert(x);
    window.opener.location='bl_zip_sngl.asp?txtZipFr='  +x
    self.close();
  // -->
</script>
<script language="JavaScript" type="text/javascript">
   //<!--
    //opener.location.reload(true);
   //window.opener.location='bl_zip_sngl.asp?
   var x;
   document.getElementsByName("FromZip").value = 79797; //Only difference
   x = document.getElementsByName("FromZip").value;
   alert(x);
    window.opener.location='bl_zip_sngl.asp?txtZipFr='  +x
    self.close();
  // -->
</script>

it at least returns a real value. Unfortunately I need to dynamically populate the box with what the user originally typed in.

•

Join Date: Jun 2006

Posts: 7,600

Reputation: ~s.o.s~ has much to be proud of

Solved Threads: 462

~s.o.s~

Offline

Failure as a human

Re: getElementsByName() generates undefined ouput value in a textbox

Sep 5th, 2007

document.getElementsByName() returns a nodeList or simply put an array. You just can't directly assign a value to an array reference. You need to do something like the one given below assuming there is only element which goes by the name of 'FromZip'. document.getElementsByName("FromZip")[0].value = 79797;

Last edited by ~s.o.s~; Sep 5th, 2007 at 12:35 pm.

I don't accept change; I don't deserve to live.