如何从json创建表列和字段？(动态网格)

Question

我有一个json文件,我认为我不知道任何内容.我不知道这个模型.但是,它在json文件中给出了有关网格的模型,数据和其他信息.我将如何以这种方式创建列等？

Answer 1

Stackoverflow充斥着与此非常类似的问题.我完成了所有工作并没有找到明确的解决方案.但是,大多数提供的答案都指出了我正确的方向.我会尽最大努力将所有这些建议放在一起并为其他人明确表达:

型号:(仅显示将在所有JSON响应中的2个字段.仍将被覆盖)

Ext.define('RTS.model.TestsModel', {
    extend: 'Ext.data.Model',
    alias: 'model.TestsModel',

    fields: [
        {
            name: 'poll_date'
        },
        {
            name: 'poller'
        }
    ]
});

商店:

Ext.define('RTS.store.TestsStore', {
    extend: 'Ext.data.Store',
    alias: 'store.TestsStore',

    model: 'RTS.model.TestsModel',

    constructor: function(cfg) {
        var me = this;

        cfg = cfg || {};

        me.callParent([Ext.apply({
            autoLoad: false,
            proxy       : {
                type    : 'ajax',
                url     : 'tests.php',
                reader  : {
                    type    : 'json',
                    root    : 'tests',
                    successProperty : 'success'
                }
            },            
            storeId: 'tests-store'
        }, cfg)]);
    }
});

视图:(列将在每个JSON响应中定义)

Ext.define('RTS.view.TestsView', {
    extend: 'Ext.grid.Panel',
    alias: 'widget.TestsView',

    id: 'tests-view',
    title: 'Tests',
    emptyText: '',
    store: 'TestsStore',

    initComponent: function() {
        var me = this;

        Ext.applyIf(me, {
            viewConfig: {

            },
            columns: [
            ]
        });

        me.callParent(arguments);
    }

});

控制器:(控制器完成所有工作,强制视图和模型根据JSON响应进行更改).

Ext.define('RTS.controller.TestsController', {
    extend: 'Ext.app.Controller',
    alias: 'controller.TestsController',

    stores: [
        'TestsStore'
    ],
    models: [
        'TestsModel'
    ],
    views: [
        'TestsView'
    ],

    init: function(application) {

        // When store changes, trigger an event on grid
        // to be handled in 'this.control'.  

        // NOTE : Ext JS does not allow control of 
        // non-component events.

        // Ext JS 4.2 beta will allow the controller
        // to detect non-component changes and handle them
        var testsStore = this.getStore('TestsStore');
        testsStore.on("metachange", metaChanged, this);
        function metaChanged(store, meta) {
            var grid = Ext.ComponentQuery.query('TestsView')[0];
            grid.fireEvent('metaChanged', store, meta);
        };


        this.control({
            "TestsView": {
                metaChanged: this.handleStoreMetaChange
            }
        });
    },

    /**
     * Will update the model with the metaData and
     * will reconfigure the grid to use the
     * new model and columns.
     */
    handleStoreMetaChange: function(store, meta) {
        var testsGrids = Ext.ComponentQuery.query('TestsView')[0];
        testsGrids.reconfigure(store, meta.columns);
    }

});

JSON响应: 您的json响应必须包含"metaData"属性.它应该像在静态模型上一样定义字段,并且通常定义为显示字段的视图.

{
    "success": true,
    "msg": "",
    "metaData": {
        "fields": [
            {
                "name": "poller"
            },
            {
                "name": "poll_date"
            },
            {
                "name": "PING",
                "type": "int"
            },
            {
                "name": "SNMP",
                "type": "int"
            },
            {
                "name": "TELNET",
                "type": "int"
            },
            {
                "name": "SSH",
                "type": "int"
            },
            {
                "name": "all_passed"
            }
        ],
        "columns": [
            {
                "dataIndex": "poller",
                "flex": 1,
                "sortable": false,
                "hideable": false,
                "text": "Poller"
            },
            {
                "dataIndex": "poll_date",
                "flex": 1,
                "sortable": false,
                "hideable": false,
                "text": "Poll Date"
            },
            {
                "dataIndex": "PING",
                "flex": 1,
                "sortable": false,
                "hideable": false,
                "text": "PING",
                "renderer": "RenderFailedTests"
            },
            {
                "dataIndex": "SNMP",
                "flex": 1,
                "sortable": false,
                "hideable": false,
                "text": "SNMP",
                "renderer": "RenderFailedTests"
            },
            {
                "dataIndex": "TELNET",
                "flex": 1,
                "sortable": false,
                "hideable": false,
                "text": "TELNET",
                "renderer": "RenderFailedTests"
            },
            {
                "dataIndex": "SSH",
                "flex": 1,
                "sortable": false,
                "hideable": false,
                "text": "SSH",
                "renderer": "RenderFailedTests"
            },
            {
                "dataIndex": "all_passed",
                "flex": 1,
                "sortable": false,
                "hideable": false,
                "text": "All Passed",
                "renderer": "RenderFailedTests"
            }
        ]
    },
    "tests": [
        {
            "poller": "CHI",
            "poll_date": "2013-03-06",
            "PING": "1",
            "SNMP": "0",
            "TELNET": "1",
            "SSH": "0",
            "all_passed": "0"
        },
        {
            "poller": "DAL",
            "poll_date": "2013-03-06",
            "PING": "1",
            "SNMP": "0",
            "TELNET": "1",
            "SSH": "0",
            "all_passed": "0"
        },
        {
            "poller": "CHI",
            "poll_date": "2013-03-04",
            "PING": "1",
            "SNMP": "0",
            "TELNET": "1",
            "SSH": "0",
            "all_passed": "0"
        },
        {
            "poller": "DAL",
            "poll_date": "2013-03-04",
            "PING": "1",
            "SNMP": "0",
            "TELNET": "1",
            "SSH": "0",
            "all_passed": "0"
        },
        {
            "poller": "CHI",
            "poll_date": "2013-03-01",
            "PING": "1",
            "SNMP": "0",
            "TELNET": "1",
            "SSH": "0",
            "all_passed": "0"
        }
    ]
}

Answer 2

http://docs.sencha.com/ext-js/4-1/#!/api/Ext.data.reader.Json -> 响应元数据部分

在网格中不要忘记添加这个，columns: [],然后在商店下listeners: { 'metachange': function(store, meta) { myGrid.reconfigure(store, meta.columns); } }，响应 json 文件应该包含带有字段和列的元数据。请阅读文档中的响应元数据部分以获取更多信息。