从dc.js图表​​访问过滤/剪裁的数据

Question

我是dc.js的新手.

我有一些数据:

var data =
[
        {date: Date.UTC(2015, 4, 4), frame: "frame1" },
        {date: Date.UTC(2015, 2, 1), frame: "frame2" },
        {date: Date.UTC(2015, 2, 11), frame: "frame3" },
        {date: Date.UTC(2015, 1, 4), frame: "frame4" },
];

//create crossfilter
    cf = crossfilter(data);
//create dimension
    byDate = cf.dimension(function (d) {
            return d.date; 
    });
//create group
    byDateGroup = byDate.group();

我正在使用这个dc.lineChart:

    //configure timeGraph
    timeGraph = dc.lineChart("#range")
    .width(document.body.clientWidth)
    .height(100)
    .dimension(byDate)
    .group(byDateGroup)
    .transitionDuration(500)
    .elasticY(true)
    .x(d3.time.scale().domain([(byDate.bottom(1))[0].date, (byDate.top(1))[0].date + 1000]))
    ;

我想访问由可调范围选择器栏过滤的数据.我认为传递一个函数onfiltered可以工作,但我不知道要从哪里访问chart以返回当前过滤的数据.

    timeGraph.on("filtered", function (chart) {
     console.log(/* print the data filtered by the 'range selector' */);
});

这是一个带有示例的JSFiddle.如果示例正常工作,表中显示的所有内容都应显示在控制台中.

提前致谢.

Answer 1

top在维度上使用该方法.在你的小提琴的背景下,byDate.top(Infinity).

https://jsfiddle.net/6p3vhga9/

该方法的Crossfilter API文档:https://github.com/square/crossfilter/wiki/API-Reference#dimension_top