javascript - knockout 嵌套 foreach 添加和删除不起作用

Question

我在嵌套的 foreach 中添加和删除时遇到问题。在这个例子中，我们有一个有很多房间的房子。每个房间都有许多家具。到目前为止，使用这段代码，我可以让数据正确显示并可以添加和删除房间，但我无法添加或删除家具。

HTML

//Other House fields work as expected above this section

<div data-bind='foreach: rooms'>
    <button type="button" data-bind='visible: $root.rooms().length > 1, click: $root.removeRoom'> Remove Room </button>

    <p> Room Name</p>
    <input type="text" data-bind="value: name"></input>

    //with: appears to work the same as a foreach -- neither seem to work
    <div data-bind="with: furnitures">
        <button type="button" data-bind='click: $root.rooms().furnitures().removeFurniture'> Remove Furniture </button>
        <p> Furniture Name</p>
        <input type="text" data-bind="value: name"></input>
    </div>
    <button type="button" data-bind='click: $root.rooms().furnitures().addFurniture'> Add Furniture </button>
</div>   

<button type="button" data-bind='click: $root.addRoom'> Add Room </button> 

JavaScript

var HouseModel = function(rooms) {

    var self = this;
    self.rooms = ko.observableArray(rooms);

    // Not sure what to put here for Furniture because each room array item has an array of many furnitures

    // ROOM MANAGEMENT ==========================
    self.addRoom = function() {
        self.rooms.push({
            name:"",
            furnitures[]: ""
        });
    };

    self.removeRoom = function(room) {
        self.rooms.remove(room);
    };

            // FURNITURE MANAGEMENT ==========================
            // Not sure where this goes
            self.addFurniture = function() {
                self.furnitures.push({
                    name: ""
                });
            };

            self.removeFurniture = function(furniture) {
                self.furnitures.remove(furniture);
            };
};

var viewModel = new HouseModel(rooms); // rooms are the pre-existing rooms and their furniture, in JSON format
ko.applyBindings(viewModel);

这方面的主要问题可能与按钮数据绑定(bind)的上下文以及模型的编码方式有关。缺少或错误的东西。

感谢您的想法。

更新 这是问题的一个 fiddle : http://jsfiddle.net/zhLf1n61/

资源:

• > Knockout nested view model (这个例子是不同的，因为它没有嵌套 View 模型)
• > Knockout.JS official -working with collections (我发现这很难适用于我的情况)

Answer 1

更新了 javascript...

主要入口点是 HouseModel...房屋有房间(以及移除和添加它们的方法)，房间有家具(有添加和移除它们的方法)。一切都与封装和范围有关。

在这里 fiddle :http://jsfiddle.net/zqwom7kd/

var initialData = [{
    "name": "Living Room",
        "furnitures": [{
        "name": "Bookshelf",
            "size": "Medium"
    }]
}, {
    "name": "Bedroom",
        "furnitures": [{
        "name": "Bed",
            "size": "Large"
    }, {
        "name": "Night Table",
            "size": "Small"
    }, {
        "name": "Jacuzzi",
            "size": "Large"
    }]
}];
var Furniture = function(data) {
    var self = this;
    self.name = ko.observable('');
    self.size = ko.observable('');
    if (typeof data !== 'undefined') {
        self.name(data.name);
        self.size(data.size);
    }
}
var Room = function(name, furnitures) {
    var self = this;
    self.name = ko.observable(name);
    self.furnitures = ko.observableArray([]);
    if (typeof furnitures !== 'undefined') {
        $.each(furnitures, function(i, el) {
            self.furnitures.push(new Furniture({name: el.name, size: el.size}));
        });
    }
    self.removeFurniture = function(furniture) {
        self.furnitures.remove(furniture);
    };
    self.addFurniture = function() {
        console.log("added");
        self.furnitures.push(new Furniture({name: '', size: ''}));
    };
};

var HouseModel = function (rooms) {
    var self = this;
    self.save = function() {
        console.log("do stuff");
    };
    self.lastSavedJson = ko.observable('');
    self.rooms = ko.observableArray([]);
    if (typeof rooms !== 'undefined') {
        $.each(rooms, function(i, el) {
            self.rooms.push(new Room(el.name, el.furnitures));
        });
    }

    self.addRoom = function(name) {
        self.rooms.push(new Room(name));
    };

    self.removeRoom = function (room) {
        self.rooms.remove(room);
    };
};

ko.applyBindings(new HouseModel(initialData));

HTML

<h2>House Components</h2>

<div id='roomsList'>
    <table class='roomsEditor'>
        <tr>
            <th>Room Name</th>
            <th>Furnitures</th>
        </tr>
        <tbody data-bind="foreach: rooms">
            <tr class="well">
                <td valign="top">
                    <input type="text" data-bind='value: name' />
                    <div> <button class="btn btn-danger" data-bind='click: $root.rooms.removeRoom'>Remove Room</button>
                    </div>
                </td>
                <td>
                    <table>
                        <tbody data-bind="foreach: furnitures">
                            <tr>
                                <td>
                                    <input type="text" data-bind='value: name' />
                                </td>
                                <td>
                                    <input type="text" data-bind='value: size' />
                                </td>
                                <td>
                                    <button class="btn btn-danger" data-bind='click: $parent.removeFurniture'>Delete Furniture</button>
                                </td>
                            </tr>
                        </tbody>
                    </table>
                    <button class="btn btn-success" data-bind='click: addFurniture'>Add Furniture</button>

                </td>
            </tr>
        </tbody>
    </table>
</div>
<p>
    <button class="btn btn-success" data-bind='click: $root.rooms.addRoom'>Add Room</button>
    <button data-bind='click: save, enable: rooms().length > 0'>Save to JSON</button>
</p>
<textarea data-bind='value: lastSavedJson' rows='5' cols='60' disabled='disabled'></textarea>