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Asked: 2026-05-11T05:51:25+00:00

After converting an ASP.NET webform (v3.5) to use a master page, I started getting

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After converting an ASP.NET webform (v3.5) to use a master page, I started getting a strange Javascript error.

The content page has a block of javascript. Here it is:

 <script type='text/javascript'>      var attCount = 0;      function CreateAttachmentControl() {         var newAtt = document.createElement('span');         var newAttName = 'area' + attCount;         newAtt.setAttribute('id', newAttName);         newAtt.setAttribute('name', newAttName);          var newInput = document.createElement('input');         var newInputName = 'att' + attCount;         newInput.setAttribute('type', 'file');         newInput.setAttribute('id', newInputName);         newInput.setAttribute('name', newInputName);          if (newInput.addEventListener) {             newInput.addEventListener('onchange', CreateAttachmentControl, false);         } else if (newInput.attachEvent) {             newInput.attachEvent('onchange', CreateAttachmentControl);         } else {             newInput.onchange = CreateAttachmentControl;         }          var newRemove = document.createElement('a');         newRemove.setAttribute('href', 'javascript:RemoveAttachmentControl('' + attCount + '')');         newRemove.setAttribute('title', 'Remove this attachment');         newRemove.innerHTML = 'X';         newAtt.appendChild(newInput);         newAtt.appendChild(document.createTextNode(' '));         newAtt.appendChild(newRemove);         newAtt.appendChild(document.createElement('br'));         attArea.appendChild(newAtt); // error here          attCount++;     }      function RemoveAttachmentControl(n) {          // get input element         var input = document.getElementById('att' + n);          // if the input is blank dont delete         if (input.value != '' && input.value != null) {             var att = document.getElementById('area' + n);             attArea.removeChild(att);         }     } </script>

The error is: ‘attArea’ is undefined

But, I know that it is not, because just below my block of javascript is this:

...<td align='left' colspan='2' style='height: 13px' id='attArea' name='attArea'></td>...

This working perfectly before I converted the webform into content page with a master page. Is there some known Javascript + Masterpage issues?

Thanks

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1 Answer

  1. In the code sample you provided, attArea is undefined. The first reference to it you are calling attArea.appendChild(). Is it declared somewhere higher in the source that you didn’t provide?

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