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How would you handle calling a user confirmation dialog before continuing with a task in a web-based MVP pattern implementation? It'll have to do a postback in between and the confirmation would go out of the scope of the presenter function that called it. I'd prefer to keep to a pure MVP implementation but is it even possible?

Jonn
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You can't implement this logic in one single server-side function. I believe the standard approach to tackle this is either to

  • Have multiple steps that each involve one postback to the server. One of these steps would be the confirmation dialog you mentioned

or

  • Show the confirmation dialog via Javascript
Adrian Grigore
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  • Just wondering, how would I indicate that I want to resume the operation where I left off? – Jonn Jul 19 '10 at 22:43
  • @Jonn: Do you mean from the user's perspective? Or how the server would store this kind of information for later retrieval? – Adrian Grigore Jul 20 '10 at 09:37
  • The latter one. I'm having trouble picturing the scenario without having some sort of enumeration that indicates the current process the user is undergoing. – Jonn Jul 20 '10 at 23:24
  • @Jonn: I can't think of any other way to do it. You have to use persistent storage at some point, be it in the session storage or in your database. – Adrian Grigore Jul 21 '10 at 09:45
  • Ah.. well. Just though that there might be some mechanism that I didn't know of. Thanks. XD – Jonn Jul 21 '10 at 23:53