如何在Knockout JS中强制使用applyBindings

Question

I want to refresh model binding for my page. As says documentation I use applyBindings method. Also I need to use few viewModels on a page. To do it I use object-wrapper + "with" keyword on binding:

ko.applyBindings({ model1: {...}, model2: {...} });

<div data-bind="with: $root.model1"> ... </div>
<div data-bind="with: $root.model2"> ... </div>

It works fine until I don't use dynamic bindings update. If I try to add additional viewmodels on a page, it doesn't work :(

Few pieces of code:

1) Works fine:

$("#b1").click(function () {
ko.applyBindings({
    myModel1: {
        MyText: ko.observable("Some text")
    },
    myModel2: {
        MyText: ko.observable("Some text")
    }
});

});

$("#b2").click(function () {
    ko.applyBindings({
        myModel1: {
            MyText: ko.observable("Some other text")
        },
        myModel2: {
            MyText: ko.observable("Some other text 2")
        }
    });
});

2) Doesn't work:

$("#b1").click(function () {
ko.applyBindings({
    myModel1: {
        MyText: ko.observable("Some text")
    }
});

});

$("#b2").click(function () {
    ko.applyBindings({
        myModel1: {
            MyText: ko.observable("Some other text")
        },
        myModel2: {
            MyText: ko.observable("Some other text 2")
        }
    });
});

As I understand, we have no way to bind additional view models in such manner. I also tried to use "ko.cleanNode()" method, but it doesn't work too. Full sample of code stored at http://jsfiddle.net/eN8dq/2/

Can you suggest me true way how I can add additional view model on a page? Thank you!

Answer 1

try not to force bindings, but change value for already bound model:

var viewModel = function () {
    var self = this;

    self.myModel1 = ko.observable( {
        MyText: ko.observable("Some other text")
    });

    self.myModel2 = ko.observable({
        MyText: ko.observable("Some other text 2")
    });


    self.clickAction = function() {
        //do the trick of assigning value
        self.myModel1 ({
            MyText: ko.observable("Some another text")
        });
    };
};

ko.applyBindings(new viewModel());   

Answer 2

My solution for this case: https://github.com/sergun/Knockout-MultiModels

Any comments?