我正在尝试构建一个关于如何replace a crossfilter data restoring dimensions and groups的问题的可重现示例 - 即在数据更新之前重新应用用户创建的任何过滤器。这是我实施the accepted answer的尝试。这是一个working jsfiddle。
脚本会在3秒后刷新,从data1
切换到data2
。如果您在此之前应用过滤器(例如,请单击Mr A
),则当图表更新时,过滤器会被“记住”,因为右侧元素会突出显示(其他颜色为灰色)。但是过滤器不会应用于其他图形。您需要删除过滤器并重新应用才能生效(例如,移除2013
饼段)。
我的实施或解决方案本身有问题吗?
<!DOCTYPE html>
<html lang="en">
<head>
<title>dc.js - Example</title>
<meta charset="UTF-8">
<link rel="stylesheet" type="text/css" href="http://dc-js.github.io/dc.js/css/dc.css"/>
<script type="text/javascript" src="http://dc-js.github.io/dc.js/js/d3.js"></script>
<script type="text/javascript" src="http://dc-js.github.io/dc.js/js/crossfilter.js"></script>
<script type="text/javascript" src="http://dc-js.github.io/dc.js/js/dc.js"></script>
</head>
<body>
<div id="chart-ring-year"></div>
<div id="chart-row-spenders"></div>
<script type="text/javascript">
var yearRingChart = dc.pieChart("#chart-ring-year"),
spenderRowChart = dc.rowChart("#chart-row-spenders");
var data1 = [
{Name: 'Mr A', Spent: 40, Year: 2011},
{Name: 'Mr B', Spent: 10, Year: 2011},
{Name: 'Mr C', Spent: 40, Year: 2011},
{Name: 'Mr A', Spent: 70, Year: 2012},
{Name: 'Mr B', Spent: 20, Year: 2012},
{Name: 'Mr B', Spent: 50, Year: 2013},
{Name: 'Mr C', Spent: 30, Year: 2013}
];
var data2 = [
{Name: 'Mr A', Spent: 10, Year: 2011},
{Name: 'Mr B', Spent: 20, Year: 2011},
{Name: 'Mr C', Spent: 50, Year: 2011},
{Name: 'Mr A', Spent: 20, Year: 2012},
{Name: 'Mr B', Spent: 40, Year: 2012},
{Name: 'Mr B', Spent: 50, Year: 2013},
{Name: 'Mr C', Spent: 50, Year: 2013}
];
// data reset function (adapted)
function resetData(ndx, dimensions) {
dimensions.forEach(function(dim){dim.filter(null);});
ndx.remove();
}
// set crossfilter with first dataset
var ndx = crossfilter(data1),
yearDim = ndx.dimension(function(d) {return +d.Year;}),
spendDim = ndx.dimension(function(d) {return Math.floor(d.Spent/10);}),
nameDim = ndx.dimension(function(d) {return d.Name;}),
spendPerYear = yearDim.group().reduceSum(function(d) {return +d.Spent;}),
spendPerName = nameDim.group().reduceSum(function(d) {return +d.Spent;}),
spendHist = spendDim.group().reduceCount();
function render_plots(){
yearRingChart
.width(200).height(200)
.dimension(yearDim)
.group(spendPerYear)
.innerRadius(50);
spenderRowChart
.width(250).height(200)
.dimension(nameDim)
.group(spendPerName)
.elasticX(true);
dc.renderAll();
}
render_plots();
// REFRESH DATA AFTER 3 SECONDS
setTimeout(function() {
console.log("data reset");
resetData(ndx, [yearDim, spendDim, nameDim]);
ndx = crossfilter(data2),
yearDim = ndx.dimension(function(d) {return +d.Year;}),
spendDim = ndx.dimension(function(d) {return Math.floor(d.Spent/10);}),
nameDim = ndx.dimension(function(d) {return d.Name;}),
spendPerYear = yearDim.group().reduceSum(function(d) {return +d.Spent;}),
spendPerName = nameDim.group().reduceSum(function(d) {return +d.Spent;}),
x = spendPerName,
spendHist = spendDim.group().reduceCount();
render_plots();
}, 3000);
</script>
</body>
</html>
答案 0 :(得分:12)
以下是您的工作示例:XML to C# Class Generator
有几个问题已得到纠正,但最重要的是,不要重建您的Crossfilter,您的尺寸或您的群组。这是不必要的。现有的维度和组将使用新数据进行更新。
只需删除Crossfilter中的旧数据(ndx.remove()
,但不添加过滤器),然后添加新数据(ndx.add(data2)
),然后告诉dc.js自行更新({{1} })。这就是你需要对你的Crossfilter做的所有事情。
那么问题是如何删除所有过滤器并在此过程中维护dc.js过滤器?关键是要与您的dc.js图表进行交互,而不是直接与您的尺寸进行交互。对于您的序数选择图表,您可以执行以下操作:
dc.redrawAll()
也就是说,从图表中抓取过滤器,将图表上的过滤器设置为function resetData(ndx, dimensions) {
var yearChartFilters = yearRingChart.filters();
var spenderChartFilters = spenderRowChart.filters();
yearRingChart.filter(null);
spenderRowChart.filter(null);
ndx.remove();
yearRingChart.filter([yearChartFilters]);
spenderRowChart.filter([spenderChartFilters]);
}
,删除Crossfilter数据,然后将过滤器添加回图表。精确的过滤器格式有点棘手,而且必须将.filters()的输出放在一个数组中以使其与.filter()一起使用这一事实有点奇怪,但在dc.js中情况越来越好2.0测试版。