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pass value from apex:repeat to class



i am desperately trying to find a way to pass a value from a Visualforce page to my custom controller without the user having to do something.


The background is that i have some nested apex:repeat-elements and i need a value from the first repeat passed to the controller to execute a database query comparing that value and use the result as a list for the second apex:repeat.


Is this somehow possible?


I already thought about using apex:inputHidden to set the value to the field and pass it to the controller but as i understand it, i need to call an action to pass the value, is that correct?