Javascript 分组json数据以创建分组条形图
作为先驱,我对d3/js非常陌生。我正试图建立一个分组条形图的基础上,由迈克博斯托克提供。他的示例非常好,我理解大部分源代码,但我不知道如何将其转换为数据。mbostock示例提供的数据是csv格式的,而我的数据是json格式的——不幸的是,格式非常不同 页面上提供了mbostock csv示例,我已将json数据粘贴到下面Javascript 分组json数据以创建分组条形图,javascript,json,svg,d3.js,bar-chart,Javascript,Json,Svg,D3.js,Bar Chart,作为先驱,我对d3/js非常陌生。我正试图建立一个分组条形图的基础上,由迈克博斯托克提供。他的示例非常好,我理解大部分源代码,但我不知道如何将其转换为数据。mbostock示例提供的数据是csv格式的,而我的数据是json格式的——不幸的是,格式非常不同 页面上提供了mbostock csv示例,我已将json数据粘贴到下面 {"data":[{"id":455211,"name":"Bacon Portabella Melt on Brioche","volume":15,"trend":{"
{"data":[{"id":455211,"name":"Bacon Portabella Melt on Brioche","volume":15,"trend":{"years":2013,"quarters":4,"months":10}},{"id":455097,"name":"Pretzel Bacon Cheeseburger","volume":287,"trend":{"years":2013,"quarters":4,"months":10}},{"id":455315,"name":"Spicy Chipotle Jr Cheeseburger","volume":0,"trend":{"years":2013,"quarters":4,"months":10}},{"id":455211,"name":"Bacon Portabella Melt on Brioche","volume":1474,"trend":{"years":2013,"quarters":4,"months":11}},{"id":455097,"name":"Pretzel Bacon Cheeseburger","volume":155,"trend":{"years":2013,"quarters":4,"months":11}},{"id":455315,"name":"Spicy Chipotle Jr Cheeseburger","volume":0,"trend":{"years":2013,"quarters":4,"months":11}},{"id":455211,"name":"Bacon Portabella Melt on Brioche","volume":1623,"trend":{"years":2013,"quarters":4,"months":12}},{"id":455097,"name":"Pretzel Bacon Cheeseburger","volume":47,"trend":{"years":2013,"quarters":4,"months":12}},{"id":455315,"name":"Spicy Chipotle Jr Cheeseburger","volume":13,"trend":{"years":2013,"quarters":4,"months":12}}],"countInfo":{"globalTotal":3649,"total":4359},"metadata":{"runDate":1435260902236,"resultSource":0}}
此数据是API调用的结果。我的目标是以一种可以轻松地将json数据绑定到d3并调用它的方式来操作json数据。例如,我希望能够将“培根波塔贝拉奶油干酪融化”的卷进行分组,这样我就可以很容易地说“10月(10月)-15日,11月(11月)-1474年,12月(12月)-1623年”,或者以另一种方式,“10月,每个汉堡都有x卷;11月……”
为了获得数据绑定,mbostock使用以下方法:
var ageNames = d3.keys(dataset[0]).filter(function(key) { return key !== "State"; });
dataset.forEach(function(d) {
d.ages = ageNames.map(function(name) { return {name: name, value: +d[name]}; });
});
但我似乎无法理解这一点,因为在运行forEach函数后,我一直返回一个空数组
我理解SVG方面的绘图,所以我认为在我克服这个障碍后,我将能够成功地构建条形图。非常感谢您提供的任何帮助——一份循序渐进的“傻瓜指南”(又名me)将是最好的,但如果您刚刚得到一般建议或其他链接,这也非常棒。D3示例使用了许多不同类型的非常具体的数据结构。如果您的示例与示例的1:1不匹配,则您的示例可能会失败。
加载CSV后,将Bostock的示例对象(例如console.log(数据))与您的进行比较,并尝试提供相同的结构。实际上,这方面的示例并不多。正如您所说,这方面的主要挑战是重新设计数据集 因此,您的数据集现在按汉堡类型分组:
[
{
"name":"Bacon Portabella Melt on Brioche",
"value":[
{
"id":455211,
"name":"Bacon Portabella Melt on Brioche",
"volume":15,
"trend":{
"years":2013,
"quarters":4,
"months":10
},
"date":"2013-10"
},
{
"id":455211,
"name":"Bacon Portabella Melt on Brioche",
"volume":1474,
"trend":{
"years":2013,
"quarters":4,
"months":11
},
"date":"2013-11"
},
{
"id":455211,
"name":"Bacon Portabella Melt on Brioche",
"volume":1623,
"trend":{
"years":2013,
"quarters":4,
"months":12
},
"date":"2013-12"
}
]
},
{
"name":"Pretzel Bacon Cheeseburger",
"value":[
{
"id":455097,
"name":"Pretzel Bacon Cheeseburger",
"volume":287,
"trend":{
"years":2013,
"quarters":4,
"months":10
},
"date":"2013-10"
},
{
"id":455097,
"name":"Pretzel Bacon Cheeseburger",
"volume":155,
"trend":{
"years":2013,
"quarters":4,
"months":11
},
"date":"2013-11"
},
{
"id":455097,
"name":"Pretzel Bacon Cheeseburger",
"volume":47,
"trend":{
"years":2013,
"quarters":4,
"months":12
},
"date":"2013-12"
}
]
},
{
"name":"Spicy Chipotle Jr Cheeseburger",
"value":[
{
"id":455315,
"name":"Spicy Chipotle Jr Cheeseburger",
"volume":0,
"trend":{
"years":2013,
"quarters":4,
"months":10
},
"date":"2013-10"
},
{
"id":455315,
"name":"Spicy Chipotle Jr Cheeseburger",
"volume":0,
"trend":{
"years":2013,
"quarters":4,
"months":11
},
"date":"2013-11"
},
{
"id":455315,
"name":"Spicy Chipotle Jr Cheeseburger",
"volume":13,
"trend":{
"years":2013,
"quarters":4,
"months":12
},
"date":"2013-12"
}
]
}
]
现在张贴
指定汉堡名称上的x0轴:
//burger names makes the x0 axis
x0.domain(newData.map(function (d) {
return d.name;
}));
指定月份和年份的x1轴:
//x1 domain on month and year
x1.domain(dates).rangeRoundBands([0, x0.rangeBand()]);
然后为数据集制作矩形
最后制作年份和月份的图例
var legend = svg.selectAll(".legend")
.data(dates.slice().reverse())
.enter().append("g")
.attr("class", "legend")
.attr("transform", function (d, i) {
return "translate(0," + i * 20 + ")";
});
legend.append("rect")
.attr("x", width - 18)
.attr("width", 18)
.attr("height", 18)
.style("fill", color);
完整的工作代码在这里: