Angular virtual scrolling , modularization, multiple windows

Create a simple example of application with : - Menu bar on the top - Menu 1 – Companys with submenu “List companys” - Menu 2 – Products with submenu “listProducts” When user clicsk ListCompanys we show a kind of popup, non modal window with a list of companys. The same with list products. Both windows may coexists on the screen and work independently. When user clicks “List companys” again – we check if there is already this window. If true – it should move focus to that window. In the windows we show a datagrid (list) of companys / products. The lists should be VIRTUALLY SCROLLABLE – so that user should have a feeling that all data are in the table, but we are fetching next pages from the server. The lists should be prepared to show several milions of rows. List should cache few next pages, but also release old pages. Scrolling down can’t cause memory leaks. Transport from server – JSON The application should be modularize in that way, that the “company list” window belongs to one , and “producst” other module. These modules should be loaded on demand only when user uses them first time. Summary – main goals: 1) Several coexistent popup windows at one screen. 2) Virtuall scroll table 3) Modularization (lazy load modules)