When I try this code, I get the following error in my browser Console. Any idea how to debug this further? boot.js:195 error: Some modules could not be started Failed modules: ["web.web_client"] Non loaded modules: ["base.apps", "im_odoo_support.OdooSupport", "__job1", "mail.chat_client_action", "mail.ChatComposer", "mail.chat_manager", "mail.Chatter", "mail.systray", "mail.window_manager", "mail_tip.mail_tip", "web.planner", "web_settings_dashboard"]

I can't really tell. Doesn't seem to be related to the piece of code above. Try posting a separate Question to get a broader attention from all experts. Also, make sure to put as much context as possible (excerpts of code if possible)

My kanban view is overloaded by boxes ;) So i need some solution as well ;) In my module which will be used to move whole locations from one place to another i would like to limit the amount of boxes to for example 4 kanban columns. With my over 500 locations i should save a lot of time. Now when I have to refresh it takes a minute before anything appears on the screen :( Once I manage to add a limit of columns it should be much quicker :)

The kanban columns (or lanes) are a whole different story I'm afraid. And tackling this via Javascript like the example above could turn out to be much more complicated. As you might notice, there is a prebuilt "options.limit" variable that already does the heavy lifting for the original question here... so it was a matter of overwriting it at some specific point. But I don't think there is such a thing for the number of columns/lanes. Maybe you should simply resort to 'domains' on the server side (python and xml). You could easily specify which 4 locations you want to display in your Window Action xml definition (something like: "[('location_id','in',[3,6,11,20])]"), which would guarantee you that only those 4 columns/lanes will be displayed (assuming your view is grouped by location_id of course). If you want to do something more sophisticated, you could resort to a wizard that somehow will dynamically determine which 4 locations get to be displayed, and call the Window Action via a python return (with the dynamically constructed domain therein)