Disable (Gray Out) File Browse button

Question

To all Apex gurus,
I am facing a situation when I have a Select List Item - P2_DOCS_CATEGORY (with Display Null enabled) and a File Browse Item - P2_FILE_INPUT and I dont want end-user to be able to click on File Browse (but I want it to be visible, so disabled or grey out state would be perfect) before selecting anything from my Select List (anything but not null state, where my Null Display value is - Select Type - ).
I was trying this script in HTML Header but apperantly it doesnt work for me:
function FldEnableDisable(pThis)
if (pThis == 50)
$x('P2_FILE_INPUT').disabled=true;}
else
{ $x('P2_FILE_INPUT').disabled=false; }
} and
onChange="javascript:FldEnableDisable(this.value)" in HTML Form Element Attributes
Any ideas?
Thanks

Answer 1

Hi,
My sample
http://apex.oracle.com/pls/otn/f?p=40323:6
I have this on page HTML header
<script>
function FldEnableDisable(pThis){
  if (pThis == "%null%"){
    $x('P6_TEST').disabled=true;
  }else{
    $x('P6_TEST').disabled=false;
</script>And this in Page HTML Body Attribute
onload="$x('P6_TEST').disabled=true;"Then in item Test Lov HTML Form Element Attributes
onchange="FldEnableDisable(this.value);"At least it work for me in Firefox 3.5
Br, Jari