Question

我试图了解如何在dc.js中使用crossfilter。我有以下数据，我想首先用数据中的对象总数填充numberDisplay。然后再填充账单损失的记录数量。

var data = [
  {
    "team": "bills",
    "location": "home",
    "outcome": "loss"
  },
  {
    "team": "dolphins",
    "location": "away",
    "outcome": "loss"
  },
  {
    "team": "jets",
    "location": "home",
    "outcome": "loss"
  },
  {
    "team": "jets",
    "location": "home",
    "outcome": "win"
  },
  {
    "team": "dolphins",
    "location": "home",
    "outcome": "loss"
  },
  {
    "team": "dolphins",
    "location": "away",
    "outcome": "win"
  },
  {
    "team": "dolphins",
    "location": "home",
    "outcome": "win"
  },
  {
    "team": "dolphins",
    "location": "away",
    "outcome": "loss"
  }
]

DC.JS numberDisplay需要一个小组，但我无法弄清楚如何简单地计算开始的记录数。

var cf = crossfilter(data);
var team = cf.dimension(function(d) { return d.team })
var teams = team.group().reduceCount();

这似乎只返回第一个键的值？ reduceSum（）和groupAll（）也没有工作。

var numberDisplayElem = dc.numberDisplay("#number-display-elem");
    numberDisplayElem
        .group(teams);

基本上只是试图让总数填充numberDisplay，然后是单个数量的过滤值，例如总账单损失等。开始时遇到问题。 TIA。

Answer 1

普通的crossfilter组根据关键功能有多个bin。

如果您想要计算所有记录而不对其进行分组，请尝试使用groupAll代替：

var numRecords = cf.groupAll();
numberDisplayElem
  .group(numRecords)
  .valueAccessor(x => x);

带有crossfilter的DC.js numberDisplay获取总记录

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