如何确定dc.js中的尺寸和组? [英] How to decide dimensions and groups in dc.js?

问题描述

我是dc.js的新手，在确定尺寸和组时遇到问题.我有这样的数据

I am new to dc.js and facing issues in deciding dimensions and groups. I have data like this

this.data = [
    {Type:'Type1', Day:1, Count: 20},
    {Type:'Type2', Day:1, Count: 10},
    {Type:'Type1', Day:2, Count: 30},
    {Type:'Type2', Day:2, Count: 10}
]

我必须显示两个折线图的组合图，一个折线图用于类型1，另一个折线用于类型2.我的x轴将为Day.所以我的尺寸之一将是天

I have to show a composite chart of two linecharts one for type Type1 and other for Type2. My x-axis will be Day. So one of my dimensions will be Day

var ndx = crossfilter(this.data);
var dayDim = ndx.dimension(function(d) { return d.Day; }) 

如何进行分组?如果我在Count上执行此操作，则会显示特定日期的总计数，而这是我所不希望的.

How the grouping will be done? If I do it on Count, the total count of a particular Day shows up which I don't want.

推荐答案

您的问题尚不完全清楚，但是听起来您想同时按Type和Day

Your question isn't entirely clear, but it sounds like you want to group by both Type and Day

一种方法是使用组合键:

One way to do it is to use composite keys:

var typeDayDimension = ndx.dimension(function(d) {return [d.Type, d.Day]; }),
    typeDayGroup = typeDayDimension.group().reduceSum(function(d) { return d.Count; });

然后，您可以使用序列图在合成图内生成两个折线图.

Then you could use the series chart to generate two line charts inside a composite chart.

var chart = dc.seriesChart("#test");
chart
    .width(768)
    .height(480)
    .chart(function(c) { return dc.lineChart(c); })
    // ...
    .dimension(typeDayDimension)
    .group(typeDayGroup)
    .seriesAccessor(function(d) {return d.key[0];})
    .keyAccessor(function(d) {return +d.key[1];}) // convert to number
    // ...

有关更多详细信息，请参见系列图表示例.

See the series chart example for more details.

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