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Old December 3rd, 2006, 04:38 AM
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Default Combobox problem

Hi, I have a combobox and a hidden field. When combobox value is changed, I am storing the text value of combobox in the hidden field, below are those to fields
<input type="hidden" name="strPrinterName"/>

<select name="cboPrinterName" onClick="fnSetPrinterName()">
This combo boxes option values are generated by a bean.

OnClick() event of the combobox i have called a javascrpt function fnSetPrinterName(), Below is the function implementaion,
var frmName = document.forms[0];
function fnSetPrinterName(){
The function internally calles another function gfnCopyCBTextToOtherElt(), that takes combobox and hidden field through the parameter, Below is the function implementaion.
function gfnCopyCBTextToOtherElt(strCBName,strOtherElt){
var strList = frmName.elements[strCBName.name];
= strList.options[strList.selectedIndex].text;
The above function worked well for other sets of combobox-hidden field combinations. But This one case its giving error in function gfnCopyCBTextToOtherElt(strCBName,strOtherElt),

The line of code where the error occured is
frmName.elements[strOtherElt.name].value = strList.options[strList.selectedIndex].text;
The error is "Object does not support this property or method."

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Old December 3rd, 2006, 05:07 AM
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Perhaps you should try using onchange rather than onclick in the select element.
Your code seems a little complicated for a simple task. Why not:
<input type="hidden" name="strPrinterName"/>

<select name="cboPrinterName" onchange="fnSetPrinterName()">
  var frm = document.forms[0];
  var iIndex = frm.cboPrinterName.selectedIndex;
  if (iIndex > -1)
    frm.strPrinterName.value = frm.cboPrinterName.options[iIndex].text;

Joe (Microsoft MVP - XML)
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