How override Event On adding Of Grid Row

Frappe Framework
1

I want to do custom logic on deleting or adding row to grid .

I read this but it is not what I am looking for :

https://frappe.github.io/frappe/user/en/guides/app-development/trigger-event-on-deletion-of-grid-row.html

I want to make some validation for somthing, if it is false it should not allow the user to add new row

2

You can validate the values on form refresh event.

frappe.ui.form.on("Doctype", {
  refresh: function(frm) {
    //your validation here
  }
});
3

Here is Code snippet from Customize Form. It allows only non-standard fields to be deleted by user.

frappe.ui.form.on("Customize Form Field", {
	before_fields_remove: function(frm, doctype, name) {
		var row = frappe.get_doc(doctype, name);
		if(!(row.is_custom_field || row.__islocal)) {
			msgprint(__("Cannot delete standard field. You can hide it if you want"));
			throw "cannot delete custom field";
		}
	},
	fields_add: function(frm, cdt, cdn) {
		var f = frappe.model.get_doc(cdt, cdn);
		f.is_custom_field = 1;
	}
});

Note - Not sure about if there is any event which is called before adding row to grid.

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