Using value of application item in javascript

Question

Hello All,
Apex 3.1
I have a javascript that calls an application process, please see below. In the application process I have logic to set/change the value of an application item. Later in the javascript I need to set a page item to the value of the application item which was set in the application process. Any alerts that I post during the javascript show this value as blank, even though a similar HTP.prn in the application process displays the value!. After the script completes the correct value of the application item is in session state . Can someone explain this timing issue to me? Why can't I get the value of an application item in the javascript when the application process is called from the javascript?
Is there a simple workaround here for me to get this value?
<script>
function f_ValidateLinkLine(pThis) {
   // The row in the table
   var vRow = pThis.id.substr(pThis.id.indexOf('_')+1);
   // is Link Line really a number? 
   if ( isNaN(html_GetElement('f20_'+vRow).value)) {
        if (html_GetElement('f20_'+vRow).value.length > 0) {
        alert('Link Line is an invalid number - '+html_GetElement('f20_'+vRow).value);
        html_GetElement('f20_'+vRow).value = '';
   } else { 
       if ( ! isNaN( parseFloat(html_GetElement('f20_'+vRow).value) ) ) {
   var link_line = parseInt(html_GetElement('f20_'+vRow).value);
   if (html_GetElement('f20_'+vRow).value.length > 0) {
      var get = new htmldb_Get(null,&APP_ID.,'APPLICATION_PROCESS=ValidateLinkLine',0);
      get.add('F101_LINK_LINE',html_GetElement('f20_'+vRow).value);
      get.add('F101_INVENTORY_ITEM_ID',html_GetElement('inventory_item_id_'+Number(link_line)).value);
      get.add('F101_QUOTE_LINE_LINK_ID',html_GetElement('f01_'+spacer+link_line).value);
      get.add('F101_QUOTE_LINE_ID',html_GetElement('f01_'+vRow).value);
      get.add('F101_QUOTE_NUMBER',html_GetElement('f19_'+vRow).value);
      gReturn = get.get();
   // The application process can sometimes change the value of F101_QUOTE_LINE_ID
  //  and I need to set f37 to this value when this happens
    html_GetElement('f37_'+vRow).value =('&F101_QUOTE_LINE_ID.');  //< -- This does not work, the applicaiton item is blank!
      if (gReturn) {
       alert(gReturn);
      if(gReturn) {
       html_GetElement('f20_'+vRow).value = '';
       html_GetElement('f37_'+vRow).value = '';
   }  //End Check Length
  } else {
  html_GetElement('f37_'+vRow).value = '';
  } // is Link Line a number?   
} // End If  
} // End ValidateLinkLine
</script>Edited by: blue72TA on Aug 16, 2011 11:39 AM
Edited by: blue72TA on Aug 16, 2011 11:41 AM
Edited by: blue72TA on Aug 16, 2011 11:41 AM

Answer 1

Hi,
When you use application item in JavaScript like you do, string &F101_QUOTE_LINE_ID. is substituted by item value from session state.
Changes to that item value when you call On Demand process do not affect to page.
Lets take example,
You app item F101_QUOTE_LINE_ID value is e.g. XX in session state.
You run page and see page source it looks like this
html_GetElement('f37_'+vRow).value =('XX');Kind you have hard code value to JavaScript.
Nothing will change that unless you refresh page.
You need return value from On Demand process.
To set value code could look like then
html_GetElement('f37_'+vRow).value = gReturn;Regards,
Jari