使用crossfilter在JavaScript中动态返回结果 [英] Using crossfilter to dynamically return results in JavaScript

问题描述

我觉得crossfilter库API解释是为我的技能组以上的人编写的，但我也知道掌握它会解决我的问题。

I feel that the crossfilter library API explanation is written for someone above my skillset, but I also know that mastering it will solve my problem.

简化，我将参考此问题的 API页面示例数据。

To make it simple, I will reference the API Page's example data for this question.

var payments = crossfilter([
  {date: "2011-11-14T16:17:54Z", quantity: 2, total: 190, tip: 100, type: "tab"},
  {date: "2011-11-14T16:20:19Z", quantity: 2, total: 190, tip: 100, type: "tab"},
  {date: "2011-11-14T16:28:54Z", quantity: 1, total: 300, tip: 200, type: "visa"},
  {date: "2011-11-14T16:30:43Z", quantity: 2, total: 90, tip: 0, type: "tab"},
  {date: "2011-11-14T16:48:46Z", quantity: 2, total: 90, tip: 0, type: "tab"},
  {date: "2011-11-14T16:53:41Z", quantity: 2, total: 90, tip: 0, type: "tab"},
  {date: "2011-11-14T16:54:06Z", quantity: 1, total: 100, tip: 0, type: "cash"},
  {date: "2011-11-14T16:58:03Z", quantity: 2, total: 90, tip: 0, type: "tab"},
  {date: "2011-11-14T17:07:21Z", quantity: 2, total: 90, tip: 0, type: "tab"},
  {date: "2011-11-14T17:22:59Z", quantity: 2, total: 90, tip: 0, type: "tab"},
  {date: "2011-11-14T17:25:45Z", quantity: 2, total: 200, tip: 0, type: "cash"},
  {date: "2011-11-14T17:29:52Z", quantity: 1, total: 200, tip: 100, type: "visa"}
]);

我可以返回与特定密钥匹配的记录（数量，总数等），但是我不明白如何返回与键/值对组合匹配的结果。例如，如何返回匹配结果的结果集，其数量大于1，总数等于90，提示等于0以及选项卡的类型？这就是我完全迷失的地方。

I am able to return records that match a specific key (quantity, total, etc.), but I do not understand how to return results that match a combination of key/value pairs. For instance, how would I return the result set that matched results with a quantity more than 1, a total equal 90, a tip equal 0 and a type of tab? This is where I'm completely lost.

推荐答案

您可以为每个属性创建一个维度，然后调用每个维度的过滤方法您指定的相应过滤条件，如下所示。

You could create a dimension for each attribute and then call each dimension's filter method with the corresponding filter criteria you indicated, like so.

var payments_by_quantity = payments.dimension(function(d){return d.quantity}),
    payments_by_total = payments.dimension(function(d){return d.total}),
    payments_by_tip = payments.dimension(function(d){return d.tip}),
    payments_by_type = payments.dimension(function(d){return d.type});

payments_by_quantity.filter([1, Infinity]);
payments_by_total.filter(90);
payments_by_tip.filter(0);
payments_by_type.filter("tab");

payments_by_type.top(Infinity)

效果是累积的，所以实际上，所有值的结果都是关于所有维度的所有过滤器的结果。

The effects are cumulative, so that last line there is actually the result of all values respecting all filters from all dimensions.

这篇关于使用crossfilter在JavaScript中动态返回结果的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！