Javascript: getElementByID does not work on the pop up pages?

Question

I have two pages that call the same pop up page to get values chosen by the users. Once the value is chosen, a passBack function is called. I tried to use the getElementID to decide which is the calling page. However, it didn't work at all. The code is given as follows:
< script language="JavaScript" >
function passBack(passVal1)
if opener.document.getElementById("P8_search")==NULL
opener.document.getElementById("P6_name").value = passVal1;
opener.document.getElementById("P6_name").focus();
close();
else
opener.document.getElementById("P8_name").value = passVal1;
opener.document.getElementById("P8_name").focus();
close();
</script>
Can somebody kindly enough tell me where is wrong? Thanks in advance.

Answer 1

Rather late reply... but posting it for the reference of other users...
In my experince "if" is generally clumsy with javascript. Try avoiding it.
When u call the popup function instead, in the url, pass the name of the item to the called page. Eg. say 6 and 8 are your base pages. And u r calling - say page 70 (popup page)
Poup function -
<script language="JavaScript" type="text/javascript">
function callPopup (formItem1) {
var formVal1 = document.getElementById(formItem1).value;
var url;
url = 'f?p=&APP_ID.:70:&APP_SESSION.::::P70_X: <if calling page is 8 - give the name of the item on page8, else name of item on page 6 > ' + formVal1;
w = open(url,"winLov","Scrollbars=1,resizable=1,width=400,height=400");
if (w.opener == null)
w.opener = self;
w.focus();
</script>
So on your popup page, u have an element which holds the page it came from. (6 or 8)
Further, during passback - passback function :
<script language="JavaScript">
function passBack(passVal1,passElem1)
opener.document.getElementById(passElem1).value = passVal1;
close();
</script>
passelem1 will hold the name of the element on your base page.(which gets populated with the value from the popup)
On the report link that passes back the value, pass this as an additional param :
$x('P70_X').value
P70_X will store the name of the item on the callin page which collects the calue from the popup.