How to call method in my JavaBean from JavaScript?

I think I'd better make it clearer.
I have a dropdown list in one jsp page, when user select one item of the list, he can press a "Get record" button in the page. so all the info of this particular record will be loaded into the same page. Then the user still can press "Modify" or "Delete" button to do other transaction to this record.
I think this function is quite common in Internet. But I have no idea how they do it and what is the best method.
Thanks for any idea!

One common way to accomplish this is simply by using your form to post to the same page. So when the user selects one of the items from the dropdown list, the page will post to itself, including a parameter that represents that item (ie. a unique key from the database). You can then get the parameter, retrieve the relevant info from the database, and display it to the screen.

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