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Basically you can do it through Ajax, are you familiar with jQuery Ajax. What we are trying to do currently is to setup a easy settings to make sub report (which can be updated partially) and the dropdown can be part of sub report which ofourcse be updated via ajax. High chance the solution will be given out within this week or next. For now you can come up with your own ajax solution or wait a little bit for complete solution.
We've released the KoolReport 2.0.0, please download. The new feature of KoolReport is called SubReport which allow you to update page partially. Here is an example of using SubReport.
View example of SubReport, Inputs and Ajax Update
Do you have the Inputs package since the example does use the Inputs package but it does not require.
Let KoolReport help you to make great reports. It's free & open-source released under MIT license.
Download KoolReport View demo