APEX

I'm trying to set page items value using JavaScript on the click of a link in Interactive Report

but im getting [object HTMLCollection] in the page item rather than my doc_num value.

i followed following steps

• create a function on JavaScript > Function and Global Variable Declaration.

function setItems(val)
{ 
    apex.item( "P43_RPDF" ).setValue (val);
}

• Set the type of the column to Link and set the target type as URL and add the following code for the URL value:

javascript:setItems(#DOC_NUM#)