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Additional Validation to Address Book / Registration Fields


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Hello there.


I want to add some additional form validation to the input fields. I want the system to check if the post code matches the city..i made a new database table for the city and output it into a dropdown list..and also i want to validate if the city chosen belongs to the chosen state.. I want to do this because some customers may play around the system and enter false information combination.


In summary, these are the fields that I want to validate:


-state (dropdown)

-city (dropdown)

-post code (textfield)


so the structure will look like this:


if(state == "South Cotabato"){
if(city=="Koronadal City" && postcode=="9506"){
else if(city=="Tupi" && post==9505){
invalid return an error message; //any other combination will be invalid
}//closes the outer if statement
else if(state == "Sultan Kudarat"){
some if statements again


I think this validation maybe added to form_check.js.php file.. Just not sure. Please guide me on how to do this.


Thanks in advance,




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