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how to call javabean from jsp page upon onChange event

 
Greenhorn
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I want to know how to call javabean from jsp page upon onChange event. Can anyone send me some sample code. Other problem which I have is that i want to show two selection boxes in my page, one master list and the other slave which depends on the selected value of first list. I dont know how to do that. Please help me with some example code. Thanks in Advance.
 
Ranch Hand
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You can use javascript function on your onChange event. That function can make request to a web resource. Or you can better off use RPC. In that case exploring AJAX would be your best bet.

AJAX tutorials would also solve your parent/child boxoes issue. Otherwise you can load all the values to some javascript array and then play with javascript and onclick event.
 
Sheriff
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To re-iterate what Adeel said:
The onChange event occurs on the client, long after the (server side) JSP is finished processing and is no longer in play.

To do anything on the server with Java from an onXxx event trigger in Javascript will require a completely new request to the server.
 
Sheriff
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Please read this article.
 
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