javascript - Backbone : How to bind arguments for listenTo-callback?

Question

是否可以为 listenTo 回调绑定(bind)函数参数？

到目前为止，我已经添加了一个包装器方法“myHandler”，我想摆脱它:

// Basic marionette layout
var view = Marionette.Layout.extend({

initialize: function() {
    // wrapping view logic inside a custom object
    this.controller = new MyViewController(); 
},

// creates a sub view and adds event handlers
someFunc: function() {
    var subView = new MySubView();

    // HERE: how to bind args for callback?
    this.listenTo(subView, "myEvent", this.myHandler, this);
}, 

// this is a dummy wrapper that I want to remove
myHandler: function(e) {
    this.controller.handleIt(this, e);
},

我想做的是:

someFunc: function() {
    var subView = new MySubView();

    // here wrapIt binds 'this' as first argument for handleIt
    this.listenTo(subView, "myEvent",
        wrapIt(this.controller.handleIt, this), this);
}

Answer 1

listenTo 只接受 3 个参数。如果您需要将函数绑定(bind)到某个对象，那么跨浏览器的方法是使用下划线 _.bind 函数:

this.listenTo(subView, "myEvent", _.bind(this.myHandler, this))

但是它几乎不需要，因为您调用 listenTo 的对象是默认上下文。要阅读更多内容，请参阅这些 github 问题:

• https://github.com/documentcloud/backbone/issues/1946
• https://github.com/documentcloud/backbone/issues/2015