Metro Apps With HMTL5: Listing 2.

The default JavaScript file.

(function () {
  "use strict";

  var app = WinJS.Application;
  var activation = Windows.ApplicationModel.Activation;
  WinJS.strictProcessing();

  app.onactivated = function (args) {
    if (args.detail.kind === activation.ActivationKind.launch) {
      if (args.detail.previousExecutionState !== 
        activation.ApplicationExecutionState.terminated) {
        // TODO: This application has been newly launched. Initialize
        // your application here.
      } else {
        // TODO: This application has been reactivated from suspension.
        // Restore application state here.
      }
      args.setPromise(WinJS.UI.processAll());
    }
  };

   app.oncheckpoint = function (args) {
     // TODO: This application is about to be suspended. Save any state
     // that needs to persist across suspensions here. You might use the
     // WinJS.Application.sessionState object, which is automatically
     // saved and restored across suspension. If you need to complete an
     // asynchronous operation before your application is suspended, call
     // args.setPromise().
   };

   app.start();
})();

About the Author

Michael Crump is a product manager that works at Microsoft on the Azure platform. He is a is a developer, blogger and speaker of topics relating to cloud development. He’s passionate about helping developers understand the benefits of the cloud in a no-nonsense way. You can reach him on Twitter at mbcrump or by following his blog at michaelcrump.net.

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