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How can I do a http post request (without leaving the page) with javascript? I need to do a request to a website and i want to do some calculations with the return from that website... can please somebody help me? I know how to do this in php, but I can't find how to do this in javascript...

Hi all, I have a field element where the default value depends on the selected value of a dropdown element. how can I access the selected value of the dropdown element in my field element php code? thank you very much!