ExtJS MVC Architecture Model is persistent in server side. Store is cache of model thru its proxy. Controller connect View and data in Store. Controller responds users’ operations over View. View presents binded data and input widgets to users. Application Files Root Second Third Forth / Fifth Fifth MyApp / + ext-4 /<extjs_code> + index.html + app.js + app / + + controller /Main.js + + model /Main.js + + store /Main.js + + view / + + + Viewport.js + + + main / + + + + Act1.js + + + + Act2.js + data / + + main.json + + updatemain.json index.html < html > < head > < title > Account Manager </ title > <!-- Load ExtJS style sheet and scripts --> < link rel = " stylesheet " type = " text/css " href = " ext-4/resources/css/ext-all.css " > ...