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Calling a java bean from onchange in JSP

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I was wondering....is there a way to execute code in a java bean class, that is triggered from the javascript onchange="" function. For Example:

I have a combo box with some selections...The current selection will determine the dates that appear in the second combo box. Those dates are populated from a MySQL query retrieving them and printing them in the combo box.

The problem is, the query needs the selected value of the first box to determine which dates come up. I need that value to be in a JSP variable so that I can use it in my query...

I have done a lot of ajax and bean research and cant quite work out what i need to do...

anyone able to help?


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