Question About LOV

Question

HI
I created Select list item with a specific LOV, i want to change "Null Text" attribute depending in condition was occurred, i didn't want fixed value
Are there solution to this problem
Thanks

Answer 1

Hi,
You can do this by building the select list up with XML tags. You need to create an on demand application process (called getTran in this instance) like
DECLARE
  l_counter  NUMBER;
  l_o_name   VARCHAR2(2000);
BEGIN
  OWA_UTIL.mime_header('text/xml', FALSE);
  HTP.p('Cache-Control: no-cache');
  HTP.p('Pragma: no-cache');
  OWA_UTIL.http_header_close;
  HTP.prn('<select>');
  FOR rec IN (SELECT display_value,
                                        return_value
                      FROM    a_table
                     WHERE  something = :TEMPORARY_ITEM
                    ORDER BY 1)
  LOOP
    HTP.prn('<option value="' || rec.display_value|| '">' || rec.return_value || '</option>');
  END LOOP;
  HTP.prn('</select>');
END;You don't have to select from a table you could just select with a case statement from dual if you want.
Then you need javascript functions in the page html header like this (courtesy of Carl Backstrom):
<script type="text/javascript">
<!--
function get_AJAX_SELECT_XML(pThis,pSelect){  
     var l_Return = null; 
     var l_Select = $x(pSelect); 
     var get = new htmldb_Get(null,$x('pFlowId').value,'APPLICATION_PROCESS=getTran',0);
get.add('TEMPORARY_ITEM',pThis.value);
     gReturn = get.get('XML'); 
     if(gReturn && l_Select){ 
         var l_Count = gReturn.getElementsByTagName("option").length; 
         l_Select.length = 0; 
         for(var i=0;i<l_Count;i++){ 
             var l_Opt_Xml = gReturn.getElementsByTagName("option");
appendToSelect(l_Select, l_Opt_Xml.getAttribute('value'), l_Opt_Xml.firstChild.nodeValue)
get = null;
function appendToSelect(pSelect, pValue, pContent) { 
var l_Opt = document.createElement("option");
l_Opt.value = pValue;
if(document.all){/* why is ie different ask bill */ 
pSelect.options.add(l_Opt);
l_Opt.innerText = pContent;
}else{ 
l_Opt.appendChild(document.createTextNode(pContent));
pSelect.appendChild(l_Opt);
//-->
</script>
This is used for a cascading LOV where the return value of a first select list determines what is shown in a second select list and so is called by the onchange javascript event on the first select list.
So you just need to manipulate the first javascript function to accept whatever you want your input to be.
I don't have time to do this right now but if you need further help I will check back this evening.
Cheers
Ben