使用knockout映射插件将深层次对象映射到自定义类

Question

使用knockout mapping插件(http://knockoutjs.com/documentation/plugins-mapping.html)可以映射一个深层次的层次对象吗？

如果我有一个具有多个级别的对象:

var data = {
    name: 'Graham',
    children: [
        {
            name: 'Son of Graham',
            children: [
                {
                    name: 'Son of Son of Graham',
                    children: [
                        {
                            ... and on and on....
                        }
                    ]

                }
            ]
        }
    ]
}

如何在javascript中将其映射到我的自定义类:

var mapping = {
    !! your genius solution goes here !!

    !! need to create a myCustomPerson object for Graham which has a child myCustomerPerson object 
    !! containing "Son of Graham" and that child object contains a child myCustomerPerson 
    !! object containing "Son of Son of Graham" and on and on....

}

var grahamModel = ko.mapping.fromJS(data, mapping);

function myCustomPerson(name, children)
{
     this.Name = ko.observable(name);
     this.Children = ko.observableArray(children);
}

映射插件是否可以递归地将此数据映射到我的自定义对象的层次结构中？

Answer 1

像这样的东西(js小提琴的实时拷贝):

CSS:

.left {
    float: left;
}

.clear {
    clear: both;
}?

HTML:

<p>Current:&nbsp;
    <a href="#" data-bind="visible: (stack.length > 0), text: selectedNode().name, click: selectParentNode"></a>
    <span data-bind="visible: (stack.length <= 0), text: selectedNode().name"></span>
</p>
<p class="left">Children:&nbsp;</p>
<ul class="left" data-bind="template: {name: 'childList', foreach: selectedNode().children}"></ul>

<script type="text/html" id="childList">
    <li data-bind="click: function(){nodeViewModel.selectChildNode($data)}">
        <a href="#">A${name}</a>
    </li>
</script>

<br /><br />
<ul class="clear" data-bind="template: {name: 'backBtn'}"></ul>

<script type="text/html" id="backBtn">
    <a href="#" data-bind="visible: $data.selectedNode().back, click: function() { nodeViewModel.selectBackNode($data.selectedNode().back) }">Back</a>
</script>?

JavaScript的:

var node = function(config, parent) {
    this.parent = parent;
    var _this = this;

    var mappingOptions = {
        children: {
            create: function(args) {
                return new node(args.data, _this);
            }
        }
    };

    ko.mapping.fromJS(config, mappingOptions, this);
};

var myModel = {
    node: {
        name: "Root",
        children: [
            {
            name: "Child 1",
            back: 1,
            children: [
                {
                name: "Child 1_1",
                back: 1,
                children: [
                    {
                    name: "Child 1_1_1",
                    back: 4,
                    children: [
                        ]},
                {
                    name: "Child 1_1_2",
                    back: 2,
                    children: [
                        ]},
                {
                    name: "Child 1_1_3",
                    back: 1,
                    children: [
                        ]}
                    ]}
            ]},
        {
            name: "Child 2",
            back: 1,
            children: [
                {
                name: "Child 2_1",
                back: 1,
                children: [
                    ]},
            {
                name: "Child 2_2",
                back: 1,
                children: [
                    ]}
            ]}
        ]
    }
};

var viewModel = {

    nodeData: new node(myModel.node, undefined),

    selectedNode: ko.observable(myModel.node),

    stack: [],

    selectBackNode: function(numBack) {

        if (this.stack.length >= numBack) {
            for (var i = 0; i < numBack - 1; i++) {
                this.stack.pop();
            }
        }
        else {
            for (var i = 0; i < this.stack.length; i++) {
                this.stack.pop();
            }
        }

        this.selectNode( this.stack.pop() );
    },

    selectParentNode: function() {
        if (this.stack.length > 0) {
            this.selectNode( this.stack.pop() );
        }
    },

    selectChildNode: function(node) {
        this.stack.push(this.selectedNode());
        this.selectNode(node);
    },

    selectNode: function(node) {
        this.selectedNode(node);
    }

};

window.nodeViewModel = viewModel;
ko.applyBindings(viewModel);?

这个示例只是映射了一组无限嵌套的JSON数据,我可以说实际上在应用程序中使用这个确切的代码是很有效的.

一些额外的功能,如

selectBackNode和selectParentNode

允许你向后移动树.

在导航示例时,父标签变为允许上升一级的链接,并且一些叶节点具有后退按钮,允许它们以给定数量的级别向上移动树.

- 编辑 -

如果您的叶节点没有子数组,则可能会出现模型中不存在其他数据的问题.