Question

所以在我的数据库中，我有一个与自身有一对多关系的模型。一个很好的例子是像reddit这样的评论系统。

我目前正在做这样的事情：

<div class="body" data-bind="foreach: { data: Comments}">
    <span data-bind="text: '(' + OrderQualifier + ') ' + Text"></span>
    <!-- ko foreach: { data: Children } -->
        <span data-bind="text: '(' + OrderQualifier + ') ' + Text"></span> 
    <!-- /ko -->
</div>

显然只支持一个级别的孩子。当一个Child（Children [i]）可能有也可能没有需要循环的Children数组时，是否有一种干净的方式来构建它。在我的例子中，技术上可能是这样的无限级别（它不会）。

我很确定我能想出一些hacky但我认为可能有更好的方法。感谢。

编辑：

我想要映射的数据：

{  
   "@odata.context":"http://localhost:3080/odata/$metadata#SectionApi(*)/$entity",
   "SectionID":4,
   "Text":"Text",
   "Html":null,
   "OrderQualifier":"1",
   "IsUserCreated":false,
   "Children":[  
      {  
         "@odata.context":"http://localhost:3080/odata/$metadata#SectionApi(*)/$entity",
         "SectionID":4,
         "Text":"Text",
         "Html":null,
         "OrderQualifier":"1",
         "IsUserCreated":false,
         "Children":[  
            {  
               "@odata.context":"http://localhost:3080/odata/$metadata#SectionApi(*)/$entity",
               "SectionID":4,
               "Text":"Text",
               "Html":null,
               "OrderQualifier":"1",
               "IsUserCreated":false,
               "Children":[  
                  {  
                     "@odata.context":"http://localhost:3080/odata/$metadata#SectionApi(*)/$entity",
                     "SectionID":4,
                     "Text":"Text",
                     "Html":null,
                     "OrderQualifier":"1",
                     "IsUserCreated":false,
                     "Children":[  

                     ]
                  }
               ]
            }
         ]
      }
   ]
}

正如您所看到的，这包含3个级别的儿童评论，但我需要能够处理未知数量的儿童评论。

Answer 1

knockout模板支持递归。 http://jsfiddle.net/m812qjeq/2/

<div class="body" data-bind="foreach: Comments">
    <div data-bind="template: { name: 'childTemplate', data: $data }"></div>
</div>

<script type="text/html" id="childTemplate">
    <span data-bind="text: '(' + OrderQualifier + ') ' + Text"></span>
    <!-- ko if: $data.Children -->
        <!-- ko foreach: Children -->
            <div data-bind="template: { name: 'childTemplate', data: $data }"></div>
        <!-- /ko -->
    <!-- /ko -->
</script>

Answer 2

您可以使用模板

<div class="body" data-bind="foreach: comments">
    <div data-bind="template: { name: 'childTemplate', data: $data }"></div>
</div>

<script type="text/html" id="childTemplate">
    <span data-bind="text:comment"></span>
    <!-- ko if: $data.childrenLength > 0 -->
        <!-- ko foreach: children -->
            <div data-bind="template: { name: 'childTemplate', data: $data }" style="padding-left:35px;"></div>
        <!-- /ko -->
    <!-- /ko -->
</script>

示例Viewmodel

var comments = [{
    id: 1,
    comment: 'How can i use knockoutjs?',
    childrenLength: 3,
    children: [{
        id: 2,
        comment: 'Please seach before asking',
        childrenLength: 0,
        children: []
    }, {
        id: 3,
        comment: 'Please read the documentation',
        childrenLength: 0,
        children: []
    }, {
        id: 4,
        comment: 'You can see the blog posts on this',
        childrenLength: 2,
        children: [{
            id: 5,
            comment: 'Please seach before asking',
            childrenLength: 0,
            children: []
        }, {
            id: 6,
            comment: 'Please seach before asking',
            childrenLength: 0,
            children: []
        }]
    }]
}, {
    id: 7,
    comment: 'You question is not sufficient to be asked here?',
    childrenLength: 3,
    children: [{
        id: 8,
        comment: 'Please seach before asking',
        childrenLength: 0,
        children: []
    }, {
        id: 9,
        comment: 'Please read the documentation',
        childrenLength: 0,
        children: []
    }, {
        id: 10,
        comment: 'You can see the blog posts on this',
        childrenLength: 0,
        children: []
    }]
}]

var vm = function(){
    var self = this
    self.comments = ko.observableArray(comments)
}

$('document').ready(function () {
    ko.applyBindings(new vm())
})

敲除绑定自我的一对多关系（淘汰赛中的递归）

2 个答案:

Fiddle Demo