Java Script to disable all dropdown boxes on page (exclude other controls)

I am looking for a simple way to reference all the dropdown controls on a page, and disable them when a particular text box's text is changed. My page has other elements, such as text boxes and radio selectors, but I do not want them to be affected.

In other words, an OnClick event for a particular text box, calls a routine which disables all the dropdown boxes.


This is what I was thinking...
 
function disabledropdowns()
{
document.getElementByType("dropdown").disabled=true
}

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andrejonkerAsked:
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petiexCommented:
This should do it:

function disabledropdowns()
            {
                var selects = document.getElementsByTagName("select");
                for (var i=0; i<selects.length; i++){
                    selects[i].disabled = true;    
                }
            }
0

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andrejonkerAuthor Commented:
Maybe it is lack of sleep, but I don't see why nothing happens... I called the above as follows:

<asp:TextBox runat="server" id="CustomerName" width="500px" onchange="javascript: disabledropdowns()">ReplaceWithCustomerName</asp:TextBox>

And in my page head, I have:


<script language="javascript" type="text/javascript">
    function disabledropdowns()
    {
        var selects = document.getElementsByTagName("select");
        for (var i = 0; i < selects.length; i++)
        {
            selects[i].disabled = true;
        }
    }
</script>

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petiexCommented:
What does the HTML rendered from your ASP code look like when you view-source on the rendered page?
 I think that with ASP, you may need to add the onchange attribute programmatically as described here: http://www.aspdev.org/articles/asp.net-javascript-add.attributes/
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andrejonkerAuthor Commented:
Changed it to:
asp:TextBox runat="server" id="CustomerName" width="500px" onchange="disabledropdowns()">ReplaceWithCustomerName</asp:TextBox>

and now the HTML result looks like:
<input name="CustomerName" type="text" value="ReplaceWithCustomerName" id="CustomerName" class="field_input" onchange="disabledropdowns()" style="width:500px;" />



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