Does ko.toJSON() work with dates?

Question

I am using knockoutjs on an asp.net mvc page. I am using ajax to persist a form back to the server by calling ko.toJSON(viewModel) and then posting the results

Answer 1

Given the current issue with ko.toJS and dates, one option would be to create a dependentObservable containing the real value that you want the server to deal with.

Something like:

var viewModel = {
    startTimeForInput: ko.observable(),
    type: ko.observable(),
    durationInMinutes: ko.observable(),
    notes: ko.observable()
};

viewModel.startTime = ko.dependentObservable(function() {
    return this.startTimeForInput().toJSON();
}, viewModel);

ko.applyBindings(viewModel);

Now, when you call ko.toJSON you will get the startTime with the correct value that the server could use.

For older browsers, something like json2.js would include the .toJSON for Date objects.