Progress tracker step 5a and 5b

I am working on a project that involves multiple screens and forms. There are approximately 15 screens the user will go through to complete a registration. Due to technical reasons dev team want to label one screen as 5a (driver license in…
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What are best practices for blocking UI when application is busy

I’m writing a web app using Twitter Bootstrap with PHP on server side.
My app makes regular ajax requests via jQuery and i want to disable certain parts of the UI until the server completes processing and hands back the control to Client-S…