使用 TreeStore 和 TreePanel 更正 JSON 和模型

Question

我有一个来自服务器端的 JSON 字符串：

{"success":"true","total":"6","list":
  [{"id":"1","name":"folder1","parentid":"null","type":"0"},
   {"id":"2","name":"r1","parentid":"1","type":"1"},
   {"id":"3","name":"folder2","parentid":"1","type":"0"},
   {"id":"4","name":"r2","parentid":"3","type":"1"},
   {"id":"5","name":"r3","parentid":"null","type":"1"},
   {"id":"6","name":"folder3","parentid":"null","type":"0"}]}

如何把它变成一棵树？谁能建议我如何获取列表中的元素（id、name、parentid、type）？

Answer 1

我使用了以下结构：

型号

Ext.define('MyApp.model.MyTreeModel', {
    extend: 'Ext.data.Model',
    fields: [
         'someStringIdentifier',
         'children',
         'dataForThisNode',
    ],
});

商店

Ext.define('MyApp.store.MyTreeStore', {
    extend: 'Ext.data.TreeStore',
    model: 'MyApp.model.MyTreeModel',
    storeId: 'cubeDynamicStoreId',
    autoLoad: false,

    proxy: {
        type: 'ajax',
        api: {
            read : '/myapp/rest/myquery',
        },
        reader: {
            type: 'json',
            root: 'children',
            successProperty: 'success',
            idProperty: 'id',
        },
    },

    // bug in extjs4.1 autoLoad is ignored
    // specifying "loaded: true" resolves the problem
    root: {
        expanded: true,
        loaded: true,
    },
});

示例 JSON（使用 http://jsonviewer.stack.hu/ 进行可视化）

使用叶子属性在任何节点停止扩展

{"children":{"leaf":false,"someStringIdentifier":"Total","dataForThisNode":{},"children":[{"leaf":true,"someStringIdentifier":"data1","dataForThisNode":{},"children":[{"leaf":false,"someStringIdentifier":"2012","dataForThisNode":{},"children":null},{"leaf":false,"someStringIdentifier":"2013","dataForThisNode":{},"children":null},{"leaf":false,"someStringIdentifier":"2014","dataForThisNode":{},"children":null},{"leaf":false,"someStringIdentifier":"2015","dataForThisNode":{},"children":null},{"leaf":false,"someStringIdentifier":"2016","dataForThisNode":{},"children":null},{"leaf":false,"someStringIdentifier":"2017","dataForThisNode":{},"children":null},{"leaf":false,"someStringIdentifier":"2018","dataForThisNode":{},"children":null}]},{"leaf":true,"someStringIdentifier":"data2","dataForThisNode":{},"children":[{"leaf":false,"someStringIdentifier":"2012","dataForThisNode":{},"children":null},{"leaf":false,"someStringIdentifier":"2013","dataForThisNode":{},"children":null},{"leaf":false,"someStringIdentifier":"2014","dataForThisNode":{},"children":null},{"leaf":false,"someStringIdentifier":"2015","dataForThisNode":{},"children":null},{"leaf":false,"someStringIdentifier":"2016","dataForThisNode":{},"children":null},{"leaf":false,"someStringIdentifier":"2017","dataForThisNode":{},"children":null},{"leaf":false,"someStringIdentifier":"2018","dataForThisNode":{},"children":null}]}]},"success":true}

Answer 2

让我们从商店定义开始：

Ext.define('app.store.Tasks', {

    extend: 'Ext.data.TreeStore',    
    model:  'app.model.Task',

    autoSync: true,
    autoLoad: true,

    root: {
        text: 'Root',
        id: 'NULL',
        expanded: true
    },
});

需要注意的重要一点是，我们在这里扩展了TreeStore。因此，我们的模型记录将使用 Ext.data.NodeInterface 包装，其中包括许多与树相关的字段（例如，parentNode）。

然后到模型定义：

Ext.define('app.model.Task', {
    extend: 'Ext.data.Model',
    fields: [
        {name: 'name'     , type: 'string'},

        {name: 'iconCls'  , type: 'string', defaultValue: 'treenode-no-icon'},
        {name: 'expanded' , type: 'boolean', defaultValue: true, persist: false},
        {name: 'index'     , type: 'int'},        
    ],

    proxy: {
        type: 'direct',

        api: {
            create:  Tasks.Create,
            read:    Tasks.Read,
            update:  Tasks.Update,
            destroy: Tasks.Destroy,
        },
    },

});

我们定义的唯一“真实”字段是name，所有其他字段都是NodeInterface 的一部分：iconCls 的默认值为无图标； expanded 设置为persist:false，因此折叠/展开节点不会导致更新服务器调用； index 包含在内，因此如果用户重新排序节点（使用拖放），将进行服务器调用。

请注意，没有 id 字段，因为模型的默认 idProperty 是 id，ExtJS 足够聪明，可以判断如果您的 JSON 中有 id 字段 - 它代表记录的唯一 ID。

另请注意，没有 parentId 字段 - 通过提供正确的 JSON（节点具有 children 属性），NodeInterface 计算出每个节点的正确 parentNode。

然后是 JSON：

{
    "success":true,
    "children":[
     {
        "id":"1",
        "name":"Home",
        "children":[
           {
              "id":"6",
              "name":"Emails",
              "leaf":true
           },
           {
              "id":"7",
              "name":"Bath",
              "leaf":true
           }
        ],
        "leaf":false
     },         
    ]
}

差不多就是这样！

Answer 3

Izhaki 对这个主题的第一个回答很好，但它似乎具有误导性，并且如果您期望看到节点的描述，它就不会按原样工作。我花了几个小时来解决这个问题。查看此描述的唯一方法是将“名称”重命名为“文本”。见下文。

Ext.define('app.model.Task', {
extend: 'Ext.data.Model',
fields: [
    {name: 'text'     , type: 'string'},

    {name: 'iconCls'  , type: 'string', defaultValue: 'treenode-no-icon'},
    {name: 'expanded' , type: 'boolean', defaultValue: true, persist: false},
    {name: 'index'     , type: 'int'},        
],