How to apply validation on popup child form

Frappe Framework Custom Script
1

how to apply validation on popup child form?
I have 2 doctypes sales data and sales customer. All the customer related information is saved in sales customer and bill will be generated in sales data for purchased item.
I had applied all form validation on sales customer form but when the same form open as popup through sales data that time no validation works.
Please help

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2

you can apply it on validate event of py side.

import re

def validate(self):
regex = re.compile(“\d{10}”)
if re.search(regex, self.number):
print(“*********************************Valid phone number”)
else:
frappe.throw(“Invalid Mobile Number”)

3

Thanks its working