Running event whenever any field value changed in the child table

[yefritavarez]

Check out this thread:

Child Table Calculation

You can use a custom script to listen to an event, say maybe when a user keys in a value in the field which will then trigger some code to sum up the 4 fields and put the result into another field. Something like this would work: frappe.ui.form.on("Sales Order Item", "rate", function(frm, cdt, cdn) { var item = locals[cdt][cdn]; var result = a + b + c; item.result_field = result; });