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I am developing a Dapp that contains a notification between two Users. for example :

  • User 1 (Student): send a transaction that contains data to be confirmed.

  • User 2 (Professor): receive a notification to validate the student data.

  • User 1 (Student): receive a notification about the professor answer.

is't possible to implement this use case using smart contract events? I took a look to web3.shh but it seems like it miss documentation

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You can doing that by create your event in your Smart Contract like :

event StudentData(address indexed _professorAddr, string indexed _studentData)

Then, using web3 api you can watch/listen for this events by filtering on the professor address by exemple, and trigger any action, like a notification, when the event realise

See documentation about events listening.

  • thnks for your quick answer. but how much time can an event live? let's say the professor will open the app after 3 week of the student submission ? – maroodb May 3 '18 at 8:43
  • According Solidity Documentation about events, it seems that events logs are stored in the blockchain, so the events are keep alive a long time that blockchain is alive I think. So in your case, when the professor open the Dapp the watch for event function start to listen from the first block to latest one and show you all of them. – Lbrth_BoC May 3 '18 at 8:57

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