The original question was about calling another web page from a dropdown. I can see what you're saying. I just don't like to see web pages, or any system for that matter, perform major operations when a drop down is selected.

PF
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>How about a web page with several select dropdowns, radio buttons, checkboxes, etc, whose values or possible options change based on the first deop-down selected, but you don't want the cost of another hit to the backend?
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>The onchange can call script that adjusts the values of other controls, hides or shows certain items, etc.