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on resume, WinJS.Application.sessionState does not restore object accessors RRS feed

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    the application has passed around a date object in the winjs.navigation.navigate(page, options) call in options.

     say

    options.startDate = new Date();

    this get stored in the navigation.history object.

    resume restore the navigation history object from the sessionobject.

    after resume - nav.state.startDate does not have the accessor methods in the date object like getFullYear, getMonth. in other words, date object is not restored only the date string is restored.

     

    questions:

    1) is this expected behavior?

    2) if yes - is passing only primitive types recommended in the navigate call options parameter since they are not restored in case of suspension and resume for the app?

     

     

     

     

     

     

    -sushil

    Wednesday, December 19, 2012 7:26 AM

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    For that kind of behavior I believe its better to store the date object on the sessionState, you can hook up the logic on the checkpoint handler on the "default.js".

    app.oncheckpoint = function (args) {
        app.sessionState.startDate = nav.state.startDate; //or whatever the object is that has the value
    };

    Then, on the resume of the App you restore the value from the sessionState 
    app.onactivated = function (args) {
//SOME LOGIC
 args.setPromise(WinJS.UI.processAll().then(function () {
    if (app.sessionState.startDate) {
       nav.state.startDate = app.sessionState.startDate; 
    } 
 }
}



    • Marked as answer by Song Tian Tuesday, December 25, 2012 8:43 AM
    Wednesday, December 19, 2012 12:57 PM