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January 23, 2007: Using AJAX to Drive Dependent Report Parameters, by Mike D'Amour, Pentaho Team Developer

A very common goal in dynamic reporting is to give the user the ability to specify some particular criteria to filter a report on, before the report data is queried for. These criteria are called parameters, and the Secure Filter Component in the Pentaho platform allows solution developers to achieve this goal. Taking the feature one step further, users many times would like to filter or choose a second set of criteria, based on the first parameter they chose. For instance, Jody manages the Western division of her company. The Western division has different products than the Eastern division. So the first parameter Jody would like to choose is the Western division. Based on that selection, Jody would like to see only Western division products. This is often called a master\slave relationship, where one set of slave data is dependent on a master set of related data.