populate select tag in php

Question

I have a many masters in my project of the basic one is country,state and city. i have added/inserted the records in mysql database but when i want to edit record how can i populate the state select tag when the country is selected from mysql database?

For example i have a record in city table as

╔════╦══════════════╦════
║ COUNTRY║  STATE║ CITY ║
╠========╬══════════════╬
║  INDIA ║ PUNJAB║ ABC  ║
║  INDIA ║ J&K   ║ PQR  ║
║  USA   ║ NJ    ║ MNO  ║
=========================

NOW when i go for edit operation for say suppose record 1 ie INDIA-PUNJAB-ABC

I am able to select INDIA in Country select tag but i am not able to get only INDIA states and select ABC in select tag of state

Answer 1

However you achieve this, you will need to interrogate the db using the selected COUNTRY. So..

1. Option 1 :perform an AJAX request 'onChange' of the COUNTRY to populate the CITY box using Javascript

2. Option 2 : refresh/submit the page 'onChange'of the COUNTRY and use the posted COUNTRY field to generate a filtered list of CITY options to use in the

Answer 2

You need to normalize your data. You need tables country and state. And in your table use city_id and state_id or only state_id.