Enabling the Back button to act as an 'undo' button in an Ajax app?

Check out jquery bbq (Back Button & Query). It allows you to achieve exactly what you want by storing state using the browser's standard history implementation. It then uses the hashChange event (when supported and some trickery when not) to trigger actions when things of interest happen (ie.

Clicking on a link or clicking back button).

Add a hidden field to store color value . First time when you change the color , add a value into a hidden form filed.

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