我有以下问题: 我的数据集如下所示:
[{
"id": 1542284,
"date": "2013-04-22",
"kilometer": 111179.364089776,
"country": "RU",
"ps": 100,
"model": "110A"
},
{
"id": 1542285,
"date": "2013-08-30",
"kilometer": 211963.649155722,
"country": "FR",
"ps": 110
"model": "110A"
},
{
"id": 1542286,
"date": "2013-03-07",
"kilometer": 163694.246231156,
"country": "DE",
"ps": 120
"model": "210B"}]
现在我想将dc.js与crossfilter.js一起使用来制作HEATMAP x轴:国家和 y轴:模型。 color属性将对应于组中的项目数:|(country x model)|
我现在的问题是如何使用两个分类轴制作crossfilter.js组语句?
var ndx = crossfilter(data);
var countryDimension = ndx.dimension(function (d){
return d.country;
});
modelByCountryGroup = countryDimension.group().reduce(
/* callback for when data is added to the current filter results */
function (p, v) {
++p.count;
//HOW DO I STORE/PROCESS v.model HERE
return p;
},
/* callback for when data is removed from the current filter results */
function (p, v) {
--p.count;
//HOW DO I STORE/PROCESS v.model HERE
return p;
},
/* initialize p */
function () {
return {count: 0, WHATDOINEEDHERE};
}
);
答案 0 :(得分:3)
您可以创建组合维度吗?
var dim = ndx.dimension(function(d) { return d.country + ":" + d.model; });
var group = dim.group();
这将按国家/地区x型号提供您的计数,对吗?