Kendo MVVM - Bind to ENTIRE View Model - kendo-ui

Question

I have a situation where I am wanting to observe the behavior of a view model as I am populating a form. I can do this with defining a lot of fields that look kind of like the model, and binding to them, but that is kind of messy.
I am currently accomplishing this with the following code;
(function ($) {
$.printJSON = function(value){
return JSON.stringify(value, undefined, 2);
}
})(jQuery);
var viewModel = kendo.observable({
// other fields etc
update: function (e) {
e.preventDefault();
$("#json_result").html($.printJSON(this));
}
});
<div style="width: 400px; float: left; padding-left: 15px;" >
<button data-bind="click: update" value="Update" >Update</button>
<pre id="json_result">
</pre>
</div>
So you click the button, and it runs the function to draw the view model JSON to the screen, all nice and formatted.
But this still requires a button click. While that isn't that big of a problem for me, since this isn't something I need for a lot of situations, is there any way to actually do this and have it update when the view model changes in any way? I tried to just bind to the function and it never updates without an explicit call, I tried binding right to the view model, and that didn't work either.

Answer 1

You could either simply bind the change event:
viewModel.bind("change", function (e) {
$("#json_result").html($.printJSON(this));
});
or you could use a calculated field:
var viewModel = kendo.observable({
field1: "field1",
field2: "field2",
field3: "field3",
print: function () {
// need to register for all fields so that the change event for print is triggered
for (var fieldName in this) {
if (this.hasOwnProperty(fieldName)) {
this.get(fieldName);
}
}
return $.printJSON(this.toJSON());
}
});
and bind to it with:
<pre data-bind="html: print">
See fiddle demonstrating both methods: http://jsfiddle.net/lhoeppner/S2WeB/