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Dynamic select on struts 2

 
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hello everyone, i want to fill a select tag with an arraylist made from a query that have a parameter from another select tag

in other words the second combobox its gonna change if you change the first one

anyone knows how to do that? im trying but it really dont get it
 
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IntelliJ IDE Ruby
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You can either use the doubleselect tag or roll your own with JavaScript.
 
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