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how to find anything changed on jsp UI, ActionForm

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I have a button on a edit jsp(struts tags), which triggers a call to one of our external services. I want to put a check in my Action before calling service to call it only if values are changed in actionform(UI).

1)edit jsp is populated, displayed to user
2)user makes changes, clicks done.
3)done method in action calls external service

I want to compare already popoulated actionform against modified one. is there a way of doing it?? can I compare two forms in action? how?
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Struts don't have idea on what happend at user browser. There are many ways to find out if the content of form has been changed or not
- One of the way to handle this will be to have a hidden field containing the hashcode of the concatenated string of fields in the form and validate the action form by comparing the stored hashcode and new hascode constructed from the new values.
- Or you can write Javascript to set some flag in the form to indicate user has changed atleast one entry.
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