Use Custom Events for Page

Frappe Framework
7

This is what I came up with. But there’s one issue, it is printing twice in console.


frappe.pages['customer'].on_page_load = function(wrapper) {
        var page = frappe.ui.make_app_page({
                parent: wrapper,
                title: 'Customer',
                single_column: true
        });

        frappe.show_alert('Hey '+frappe.session.user,3)


        page.custom_field = page.add_field({
                fieldname: 'customer',
                label: __('Customer'),
                fieldtype: 'Link',
                options: 'Customer',
                change: function(){
                        console.log('first time')
                }
        });

 }

Can anyone help/suggest why it is printing twice.

Also I tried with refresh event but that also is doing the same