Newbie: need help with set a textbox value to combo box value

[DougP]

I have this code which is called by a combo box, on change event. The text box is called txtCatalogID. I figured out how to get the value but cannot set it in the txtCatalogID.

		function GetNextCategoryNum(sel)
		{
	       		var NextNumber; 
        		var textbox = document.getElementById("txtCatalogID");
       		    var number = parseInt(sel.options[sel.selectedIndex].value); 
        		NextNumber = number + 1;
        		alert("Last number used "  + NextNumber );
                        textbox.value =NextNumber  // this does not work 
        		document.getElementById("txtCatalogID") =NextNumber  // nor this does not work       		
                         document.getElementById("txtCatalogID").value = NextNumber   // nor this does not work       		
			}

the form name is
<form Name="myForm" ....>
CatalogID <input type="text" name="txtCatalogID" size="12"><br>

TIA



DougP

 

[feherke]

Hi

You are trying to get a reference to the element with [tt]id[/tt] txtCatalogID, but probably there is no such element. At least in the HTML fragment you posted there is only an element with [tt]name[/tt] txtCatalogID.

Feherke.
[link feherke.github.com/]

http://feherke.github.com/

[/url]

 

[BillyRayPreachersSon]

As feherke has pointed out, you're trying to use a method that gets an element based on its ID attribute (the clue is in the name), yet your element has no ID attribute.

You could give it an ID, or you could use this syntax to refer to it by its name:

document.forms['myForm'].elements['txtCatalogID'].value = NextNumber;

Hope this helps,

Dan



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