ko.bindingHandler issue with Durandal

我有一个问题得到Knockout绑定处理程序与Durandal工作。我目前有一个名为binding .js的文件，我正在通过RequireJS加载到名为todo.js的视图模型中。由于某些原因，绑定处理程序似乎没有附加。在添加待办事项并按键盘上的回车键后，输入键不起作用。感谢任何帮助。该项目的代码见https://github.com/robksawyer/durandal-todo。请随意用叉子。同样值得注意的是，大多数Knockout代码来自TodoMVC Knockout+Require项目。

下面是bindings.js文件的一个片段。文件位于https://github.com/robksawyer/durandal-todo/blob/master/scripts/bindings.js.

// a custom binding to handle the enter key (could go in a separate library)
ko.bindingHandlers.enterKey = {
        init: function (element, valueAccessor, allBindingsAccessor, data) {
            var wrappedHandler, newValueAccessor;
            system.log("ENTER KEY PRESSED");
            // wrap the handler with a check for the enter key
            wrappedHandler = function (data, event) {
                if (event.keyCode === config.ENTER_KEY) {
                    valueAccessor().call(this, data, event);
                }
            };
            // create a valueAccessor with the options that we would want to pass to the event binding
            newValueAccessor = function () {
                return {
                    keyup: wrappedHandler
                };
            };
            // call the real event binding's init function
            ko.bindingHandlers.event.init(element, newValueAccessor, allBindingsAccessor, data);
        }
    };

下面是连接bindingHandler的HTML片段。文件在https://github.com/robksawyer/durandal-todo/blob/master/views/todos.html.

<header id="header">
    <h1>todos</h1>
    <input id="new-todo" type="text" data-bind="value: current, valueUpdate: 'afterkeydown', enterKey: add" placeholder="What needs to be done?" autofocus>
</header>

最后，这是加载它的视图模型的一个片段。文件位于https://github.com/robksawyer/durandal-todo/blob/master/viewmodels/todos.js.

define(
    [
    'knockout',
    'jquery',
    'durandal/app', 
    'durandal/system', 
    'scripts/dataservice', 
    'scripts/model',
    'scripts/config',
    'scripts/bindings',
    'scripts/native'
    ], 
    function(ko, $, app, system, dataservice, model, config) {
    'use strict';
    var self = this;
    var todos = ko.observableArray([]),
        current = ko.observable(), // store the new todo value being entered
        showMode = ko.observable('all');
    // add a new todo, when enter key is pressed
    var add = function() {
        var current = current().trim();
        if (current) {
            todos.push(new model.Todo(current));
            current('');
        }
    };
    ...