custom_script_session.js

frappe.ui.form.on('Sales Invoice', {
    onload(frm) {
        console.log('onload')
        frm.add_fetch('customer', 'car_model', 'car_model')
        
        frappe.db.get_value('Company', 'Facebook', 'abbr').then(function(value) {
            console.log(value.message.abbr)
        })
            
            
    },
    cost_center(frm) {
        frm.doc.items.forEach(function(row) {
            frappe.model.set_value(row.doctype, row.name, 'cost_center', frm.doc.cost_center)
        })
    }
})

frappe.ui.form.on('Sales Invoice Item', {
    qty: function(frm, cdt, cdn) {
        let total_qty = 0
        frm.doc.items.forEach(function(row) {
            total_qty = total_qty + row.qty
        })
        console.log(total_qty)
        frm.set_value('my_total_quantity', total_qty + 2)
        
        console.log(cdt, cdn)
        // const row = frappe.get_doc(cdt, cdn)
        // row.rate = total_qty
        frappe.model.set_value(cdt, cdn, 'rate', total_qty)
    }
})