I am using Ext js with Php and the Java network, all you have to do is import the library and use it. do what you want with ext js and call GET / POST on your uri site as usual and pass the data via xml or json (I prefer json because it is easier).
Eg. pressing the capture button → GET / POST - uri controller process → -> do anything in the model → send json data back → ext decode json-> show to user
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