Question

I want to validate a users input by keydown. For this I require a keydown event.
Unfortunatly I only have found custom model events:

initalize: function(){
    this.model = new ModelClass();
    this.model.bind("keydown", this.validate, this);
}

That approach surely is fine for model events but I don’t believe this is the right way for view, ui-related stuff…

To give you a better explication, this is how I would like to use my event:

var SomeView;

SomeView = Backbone.View.extend({
    events: {
        "keydown input#some-field": "validate" // custom event
        , "change input#some-field": "doSomethingElse" // predefined backbone event
    },
    validate: function(attr){
        // validation
    }
});

So what is the approach to create custom Backbone Events which are callable in the View?

Answer 1

what is the approach to create custom Backbone Events which are callable in the View?
I feel as if your problem is not a problem，because backbone.view default has been to support the events.
you can write code like what you want to:

//This is the right thing to do
SomeView = Backbone.View.extend({
    events: {
        "keydown input#some-field": "validate" // custom event
        , "change input#some-field": "doSomethingElse" // predefined backbone event
    },
    validate: function(attr){
        // validation
    }
});

Reference here：
http://backbonejs.org/docs/todos.html#section-22

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EDIT :
you can see here:
http://backbonejs.org/docs/backbone.html#section-156

The most critical sentence is：

this.$el.delegate(selector, eventName, method);

because backbone’s events is jquery’s delegate(http://api.jquery.com/delegate/),so jQuery’s delegate to support the event, backbone are available.