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Home > Forums > Programmers > Web Development > Javascript Forum

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

thread216-1684308
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DougP (MIS)
27 May 12 23:58
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.

CODE

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 (Programmer)
28 May 12 3:29
Hi

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

Feherke.
http://feherke.github.com/

BillyRayPreachersSon (Programmer)
28 May 12 19:06

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:

CODE

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

Hope this helps,

Dan

Coedit Limited - Delivering standards compliant, accessible web solutions

@ Code Couch: http://www.codecouch.com/dan/

@ Twitter: http://twitter.com/SleepyDrunkDan
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