kendo.notify()

[Rick]

We are creating custom widgets that need to look, feel, and perform on-par with Kendo widgets. We've spent a little time in source and found some undocumented methods... like kendo.notify() that appear to play an important role in data binding.

Should or should we not be using these methods as we create our own widgets?


[ kendo.button.js ]

var Button = Widget.extend({
    init: function(element, options) {
        var that = this;

        Widget.fn.init.call(that, element, options);

        ...

        element
            .on(CLICK + NS, proxy(that._click, that))
            .on("focus" + NS, proxy(that._focus, that))
            .on("blur" + NS, proxy(that._blur, that))
            .on("keydown" + NS, proxy(that._keydown, that))
            .on("keyup" + NS, proxy(that._keyup, that));

        kendo.notify(that); // Implementation found in kendo.all.js on line ~11691
    },


[ kendo.all.js ]

kendo.notify = notify;

...

function notify(widget, namespace) {
    var element = widget.element,
        bindingTarget = element[0].kendoBindingTarget;

    if (bindingTarget) {
        bind(element, bindingTarget.source, namespace);
    }
}

[Atanas Korchev]

Hello Rick,

That method call is only needed if your widget needs to support MVVM. It is a noop if Kendo MVVM isn't included.

Regards,
Atanas Korchev
Telerik

[Joshua]

What does it do?

 

Is it still required for MVVM?

[Plamen]

Hi,

There is not change in the behavior of the method - it is used only for MVVM scenarios. You can review what exactly is is doing in our public repository here.

Regards,
Plamen
Progress Telerik

[Joshua]

I have read through that, but it is a giant framework. I still don't know what it is triggering to happen.

 

I don't even think there is documentation on bindingTargets and how they are used.

[Joana]

Hi Joshua,

The bindingTarget is basically the element that is to be bound to MVVM and the notify method is used to make sure that all "data-" attributes are handled properly.

As my colleagues have already explained, the method is used internally and is part of our MVVM functionality. Here you could find the binding logic:

https://github.com/telerik/kendo-ui-core/blob/master/src/kendo.binder.js#L1788 

However, if you need assistance in how you could use it in custom widgets so that it could be easily bound to MVVM our Professional services will be able to further guide you.

Let me know if you'd like to get advantage of the Professional service.

Regards,
Joana
Progress Telerik