Question

I have two drop down menus on my website. Technologies used are Javascipt , php , mysql.

City : [        ]  Area : [        ] 

TODO: When user selects city I want to query database for areas in city and dynamically populate the area drop down menu.

When user selects area I want to query database again for results that belong to that perticular area and city.

Somthing like this(step by step).

------------------------1 City:[Choose City] ------------------------2 City :[New York] ------------------------3 City :[New York]  Area : [Choose Area] ------------------------4 City :[New York]  Area : [Times Square]     ------------------------4  10 Results Found for New York/Times Square: 1 . Result1 . 2 . Result2 ... .. . 

Here is database schema:

CREATE DATABASE `db_results` ;  CREATE TABLE `tbl_results`(     `result_id` INT NOT NULL AUTO_INCREMENT,     `result_title` VARCHAR(20),     `result_content` TEXT,     `result_category` INT,     `result_city` INT,     `result_area` INT,     PRIMARY KEY(`result_id`), );   CREATE TABLE `tbl_area`(     `area_id` INT NOT NULL AUTO_INCREMENT,     `area_name` VARCHAR(50),     `area_city` INT,     PRIMARY KEY(`area_id`) );  CREATE TABLE `tbl_cities`(     `city_id` INT NOT NULL AUTO_INCREMENT,     `city_name` VARCHAR(40),     PRIMARY KEY(`city_id`) ); 

I have created script to dynamically flood the menu but when I query database using dynamically generated menu it gives error that ‘area’ is undefined index.

Here is link to the files: FILES

Answer 1

Not much information to go on, but from your php error notice, you are trying to access an index in your results array / database table that does not exist (from your tbl_area definition – and assuming your query returns all fields – area_id, area_name and area_city are all valid indecies, but ‘area’ is not).