dotvvm

afterPostback event with Context.ReturnFile

I've found out that the afterPostback event is not being called when Context.ReturnFile() is used in the ViewModel. I use the following code to disable all the buttons on the page when postback is sent and enable them again after the postback is finished:

dotvvm.events.beforePostback.subscribe(function () {
    $('.btn-primary').prop('disabled', true).addClass('m-progress');
});
dotvvm.events.afterPostback.subscribe(function () {
    $('.btn-primary').removeAttr('disabled').removeClass('m-progress');
});

However, when some ViewModel uses Context.ReturnFile() to return a generated file, the afterPostback is not called and all the buttons on the page stay disabled.

I've also tried to use spaNavigating and spaNavigated events, but they don't seem to be called either.

Is there some workaround or another event that is called when a file is returned from ViewModel?

Solution

  • The Context.ReturnFile uses redirect internally and redirect doesn't fire this event.

    I have filed a GitHub issue and we will see if we can change the behavior for the afterPostback event to be called on redirects. If not, we will introduce a new event just for this case.