How to capture value from the drop down list

I have a drop down list consisting of 'status' values. Each city has
its own id and and a set of colors for it.
Below is my requirement :
1. If a user selects a 'status' value from the drop down, I have to
ask the user "if he/she is confirmed with the selected status".
2. If 'no' nothing should happen
3. If "yes", I should get the values of colors associated with that
particular status.
4. All the above should happen WITHOUT reloading the page.

color values are stored in mysql database.

How to acheive this using cakePHP?
Please help me in this.

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