Adding a custom meta data field which lists out content id based on query

Question

How can we add a custom meta data filed which lists out content id based on query like dDocType <matches> `AssociatedProduct`?
Or other alternative would be to have a custom metadata field such that it allows selection of content id using link wizard which we typically use in site studio. It would be preferable to have this second option as it is user friendly. Can we do this on a check-in screen?
-Pratap

Answer 1

Thanks for the reply Deepak.
We got it resolved. We did following changes in /ucm/custom/SiteStudio/resources/ss_custom_field_resources.htm file and it worked cleanly.
Added following section at the end before body tag
===================================================================================================
<@dynamichtml ss_parent_definition_field_entry@>
     <$include super.std_edit_entry$>
     <$if isQuery and isTrue(isQuery)$></td><td><$endif$>
     <$include ss_contributor_base_scripts$>
     <script type="text/javascript" src="<$HttpRelativeWebRoot$>resources/<$SSContributorSourceDir$>/sitestudio/wcm.contentserver.popup.js"></script>
     <script language="JavaScript">
     function OnSelectParentId()
          var selectParentIdOptions = {};
          selectParentIdOptions.httpCgiPath = '<$HttpCgiPath$>';
          selectParentIdOptions.queryText = 'dDocType <matches> `Country`';
          selectParentIdOptions.coreContentOnly = '<$if coreContentOnly and isTrue(coreContentOnly)$>1<$else$>0<$endif$>';
          selectParentIdOptions.callback = function( returnParams )
               returnParams = returnParams || {};
               if( returnParams && returnParams['dDocName'] && ( returnParams.dDocName.length > 0 ) )
                    // Set the actual metadata value
                    <$if isQuery AND isTrue(isQuery)$>
                         for (var i=0; i < document.<$formName$>.elements.length; i++)
                              var elt=document.<$formName$>.elements;
                              if (elt.name=="<$fieldName$>")
                                   elt.value = returnParams.dDocName;
                    <$else$>
                         document.<$formName$>.<$fieldName$>.value = returnParams.dDocName;
                    <$endif$>
          WCM.ContentServerPopup.ChooseManagedDocument(selectParentIdOptions);
     </script>
     <input type="button" value="<$lc("wwBrowse")$>..." onclick="OnSelectParentId();">
<@end@>
======================================================================================
Then modified the section which show xWebsiteSection, xRegionDefinition etc to include my custom meta data defitnion as well ('xParentContentType')
===================================================================
<@dynamichtml std_edit_entry@>
     <$if fieldName and ( fieldName like "xWebsites|xDontShowInListsForWebsites" )$>
          <$include ss_website_query_text_field$>
     <$elseif fieldName and strEquals( fieldName, "xWebsiteSection" )$>
          <$include ss_website_section_field_entry$>
     <$elseif fieldName and strEquals( fieldName, "xRegionDefinition" )$>
          <$include ss_region_definition_field_entry$>
     <$elseif fieldName and strEquals( fieldName, "xParentContentType" )$>
          <$include ss_parent_definition_field_entry$>
     <$else$>
          <$include super.std_edit_entry$>
     <$endif$>
<@end@>
====================================================================
This worked fine.
Regards,
Pratap