使用 Dojo 的 dgrid、JsonRest 和子行/数组

Question

我有一个网格，我正在创建一个格式如下的 JSON 数据源：

{"recordsReturned":10,
        "totalRecords":471,
        "startIndex":0,
        "sort":"num",
        "dir":"asc",
        "pageSize":100,
        "visitors":[
            {"num":1, "uid": "1", "ipaddress": "24.217.129.98", "hostname": "", "referer": "", "useragent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_8_2) AppleWebKit/536.26.14 (KHTML, like Gecko) Version/6.0.1 Safari/536.26.14", "date":1352086661000},
            {"num":2, "uid": "0", "ipaddress": "100.43.83.157", "hostname": "", "referer": "", "useragent": "Mozilla/5.0 (compatible; YandexBot/3.0; +http://yandex.com/bots)", "date":1351761442000},
            {"num":3, "uid": "0", "ipaddress": "100.43.83.157", "hostname": "", "referer": "", "useragent": "Mozilla/5.0 (compatible; YandexBot/3.0; +http://yandex.com/bots)", "date":1351718948000},
            {"num":4, "uid": "0", "ipaddress": "100.43.83.157", "hostname": "", "referer": "", "useragent": "Mozilla/5.0 (compatible; YandexBot/3.0; +http://yandex.com/bots)", "date":1350349829000},
            {"num":5, "uid": "0", "ipaddress": "70.36.100.148", "hostname": "", "referer": "", "useragent": "Mozilla/5.0 (compatible; MJ12bot/v1.4.3; http://www.majestic12.co.uk/bot.php?+)", "date":1349718631000},
            {"num":6, "uid": "0", "ipaddress": "180.76.5.153", "hostname": "", "referer": "", "useragent": "Mozilla/5.0 (compatible; Baiduspider/2.0; +http://www.baidu.com/search/spider.html)", "date":1349396285000},
            {"num":7, "uid": "0", "ipaddress": "76.72.166.150", "hostname": "", "referer": "", "useragent": "Mozilla/5.0 (compatible; MJ12bot/v1.4.3; http://www.majestic12.co.uk/bot.php?+)", "date":1349090589000},
            {"num":8, "uid": "0", "ipaddress": "65.55.52.115", "hostname": "", "referer": "", "useragent": "Mozilla/5.0 (compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm)", "date":1348417348000},
            {"num":9, "uid": "0", "ipaddress": "66.249.72.195", "hostname": "", "referer": "", "useragent": "Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)", "date":1348353989000},

等等。我为 YUI 2 DataTable 创建了这种 JSON 格式，它运行良好，因为它包含我需要理解记录的所有内容。我对 YUI 所做的我无法弄清楚如何处理 dgrid 是告诉它使用访问者数组的内容来填充 dgrid。这是我的 dgrid 代码：

// Create a new constructor by mixing in the components
var CustomGrid = declare([ OnDemandGrid, Keyboard, Selection ]);

var grid = new declare([OnDemandGrid, Keyboard, Selection])({
    store: store,
    columns: {
        num: "ID",
        uid: "visitorsUID"
    },
    /*selectionMode: "single", // for Selection; only select a single row at a time
    cellNavigation: false // for Keyboard; allow only row-level keyboard navigation*/
}, "grid");

grid.setQuery({aid: "1604", sort: "num", dir: "asc", startIndex: "0", results: "100"});             

有没有简单的方法告诉 dgrid 从那个子行/数组中绘制？

Answer 1

我可以在这里看到多个选项，但最直接的方法是编写自己的 Store 来满足 dojo/store/api/Store 的接口，或者只是破解它并继承 dojo/store/JsonStore 的子类：

var CustomStore = declare(JsonRest, {
    query: function(query, options) {
        var dataProperty = this.dataProperty;
        var results = this.inherited(arguments);
        var deferred = results.then(function(result) {
            return result[dataProperty];
        });
        return QueryResults(deferred);
    }           
});

那么你需要在实例化时再添加一个属性——dataProperty:

var store = new CustomStore({
    target: "/visitors/",
    idProperty: "num",
    dataProperty: "visitors"
});

在 jsFiddle 上查看它的实际效果：http://jsfiddle.net/phusick/MG9jB/

其他选项是在响应到达dojo/store/JsonRest 之前更改响应，因此JsonRest 得到它所期望的，一个数组。 Dojo 1.8 提供了使用 XHR2 的 dojo/request，因此很遗憾它不适用于 JsonRest，只是为了优雅：

// var request = require("dojo/request/registry");
// var xhr = require("dojo/request/xhr");

var handle = request.register(/(.*)\/visitors.json$/, function(url, options) {
    // if any XHR request url ends with `visitors.json` then return
    // `visitors` property
    return xhr.get(url, options).then(function(results) {
        return results["visitors"];
    });
});

request.get("app/visitors.json", {handleAs: "json"}).then(function(visitors) {
    console.log(visitors);
});

在文章Introducing dojo/request 中可以找到对dojox/io/xhrPlugins 的引用，它应该提供与遗留代码类似的功能。即使没有，您也可以使用dojo/aspect 或编写自己的content handler 来实现相同的目的。