Modify the page associated with a scripted list menu item in Service Portal

To resolve this, you can add a __page object while generating your list.

Add page object to scripted list

The following example demonstrates how to modify this functionality in an default Request Menu Item: 

1. Navigate to https://yourInstance.service-now.com/sp_rectangle_menu_item.do?sys_id=7c686d00d7200200a9ad1e173e24d4e9
2. Part of the default script populating the incident items using Glide Record query in addition the page object __page
   

   var z = new GlideRecord('incident');
   z.addActiveQuery();
   z.addQuery('caller_id', gs.getUserID());
   z.orderByDesc('sys_updated_on');
   z.setLimit(max);
   z.query();
   while (z.next()) {
       var a = {};
       $sp.getRecordValues(a, z, 'short_description,sys_id,number,sys_updated_on');
       if (z.short_description.nil())
           a.short_description = "(No description)";
       a.__table = z.getTableName();
       a.type = 'record';
       a.__page = 'form'; // __page should be string value of the page ID you would like to redirect
       a.sortOrder = z.sys_updated_on.getGlideObject().getNumericValue();
       t.items.push(a);
   }

Note: For this to work, the type of the menu item should always be set record.

Additional information

The HTML code is used to display a drop-down tree menu, specifically in the header Menu Widget, using an Angular template, spDropdownTreeTemplate.

Get the Angular template: https://yourInstance.service-now.com/sp_ng_template.do?sys_id=492127b05b301200e39fc7ad31f91a50