Javascript 处理 d3.js 轴上的日期
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dealing with dates on d3.js axis
提问by Risu
How do I make my line x-axis based on date in d3.js?
如何根据 d3.js 中的日期制作我的线 x 轴？
I am attempting to teach myself how to use d3.js. I've been looking at the examples that come with it and have been attempting to recreate the line graph using json delivered data. I'm able to feed the data into the line graph, but the x-axis is supposed to be a date instead of a number. The date format that I'm using is MM/DD/YY, but the graph plots everything at 0. My json data is coming across fine, but I'm having trouble figuring out how to plot the x coordinates. This was taken straight from the line.js that comes in the d3.js examples folder when downloaded. The date portion doesn't do the trick. I'm hoping someone can point me to an example or be able to explain how I can make it work.
我正在尝试自学如何使用 d3.js。我一直在查看它附带的示例，并尝试使用 json 传递的数据重新创建折线图。我可以将数据输入折线图中，但 x 轴应该是日期而不是数字。我使用的日期格式是 MM/DD/YY，但图表将所有内容都绘制为 0。我的 json 数据很好，但我无法弄清楚如何绘制 x 坐标。这是直接从下载时 d3.js 示例文件夹中的 line.js 中获取的。日期部分不起作用。我希望有人能给我指出一个例子，或者能够解释我如何使它工作。
d3.json('jsonChartData.action',
function (data) {
console.log(data);
var w = 450,
h = 275,
p = 30,
x = d3.scale.linear().domain([0, 100]).range([0, w]),
y = d3.scale.linear().domain([0, 100]).range([h, 0]);
var vis = d3.select("body")
.data([data])
.append("svg:svg")
.attr("width", w + p * 2)
.attr("height", h + p * 2)
.append("svg:g")
.attr("transform", "translate(" + p + "," + p + ")");
var rules = vis.selectAll("g.rule")
.data(x.ticks(5))
.enter().append("svg:g")
.attr("class", "rule");
rules.append("svg:line")
.attr("x1", x)
.attr("x2", x)
.attr("y1", 0)
.attr("y2", h - 1);
rules.append("svg:line")
.attr("class", function(d) { return d ? null : "axis"; })
.attr("y1", y)
.attr("y2", y)
.attr("x1", 0)
.attr("x2", w + 1);
rules.append("svg:text")
.attr("x", x)
.attr("y", h + 3)
.attr("dy", ".71em")
.attr("text-anchor", "middle")
.text(x.tickFormat(10));
rules.append("svg:text")
.attr("y", y)
.attr("x", -3)
.attr("dy", ".35em")
.attr("text-anchor", "end")
.text(y.tickFormat(10));
vis.append("svg:path")
.attr("class", "line")
.attr("d", d3.svg.line()
.x(function(d) { return x(d3.time.days(new Date(d.jsonDate))); })
.y(function(d) { return y(d.jsonHitCount); }));
vis.selectAll("circle.line")
.data(data)
.enter().append("svg:circle")
.attr("class", "line")
.attr("cx", function(d) { return x(d3.time.days(new Date(d.jsonDate))); })
.attr("cy", function(d) { return y(d.jsonHitCount); })
.attr("r", 3.5);
});
JSON as printed out by my action:
我的操作打印出的 JSON：
[{"jsonDate":"09\/22\/11","jsonHitCount":2,"seriesKey":"Website Usage"},`{"jsonDate":"09\/26\/11","jsonHitCount":9,"seriesKey":"Website Usage"},{"jsonDate":"09\/27\/11","jsonHitCount":9,"seriesKey":"Website Usage"},{"jsonDate":"09\/29\/11","jsonHitCount":26,"seriesKey":"Website Usage"},{"jsonDate":"09\/30\/11","jsonHitCount":2,"seriesKey":"Website Usage"},{"jsonDate":"10\/03\/11","jsonHitCount":3,"seriesKey":"Website Usage"},{"jsonDate":"10\/06\/11","jsonHitCount":2,"seriesKey":"Website Usage"},{"jsonDate":"10\/11\/11","jsonHitCount":2,"seriesKey":"Website Usage"},{"jsonDate":"10\/12\/11","jsonHitCount":2,"seriesKey":"Website Usage"},{"jsonDate":"10\/13\/11","jsonHitCount":1,"seriesKey":"Website Usage"},{"jsonDate":"10\/14\/11","jsonHitCount":5,"seriesKey":"Website Usage"},{"jsonDate":"10\/17\/11","jsonHitCount":2,"seriesKey":"Website Usage"},{"jsonDate":"10\/18\/11","jsonHitCount":6,"seriesKey":"Website Usage"},{"jsonDate":"10\/19\/11","jsonHitCount":8,"seriesKey":"Website Usage"},{"jsonDate":"10\/20\/11","jsonHitCount":2,"seriesKey":"Website Usage"},{"jsonDate":"10\/21\/11","jsonHitCount":4,"seriesKey":"Website Usage"},{"jsonDate":"10\/24\/11","jsonHitCount":1,"seriesKey":"Website Usage"},{"jsonDate":"10\/25\/11","jsonHitCount":1,"seriesKey":"Website Usage"},{"jsonDate":"10\/27\/11","jsonHitCount":3,"seriesKey":"Website Usage"},{"jsonDate":"11\/01\/11","jsonHitCount":2,"seriesKey":"Website Usage"},{"jsonDate":"11\/02\/11","jsonHitCount":1,"seriesKey":"Website Usage"},{"jsonDate":"11\/03\/11","jsonHitCount":2,"seriesKey":"Website Usage"},{"jsonDate":"11\/04\/11","jsonHitCount":37,"seriesKey":"Website Usage"},{"jsonDate":"11\/08\/11","jsonHitCount":1,"seriesKey":"Website Usage"},{"jsonDate":"11\/10\/11","jsonHitCount":39,"seriesKey":"Website Usage"},{"jsonDate":"11\/11\/11","jsonHitCount":1,"seriesKey":"Website Usage"},{"jsonDate":"11\/14\/11","jsonHitCount":15,"seriesKey":"Website Usage"},{"jsonDate":"11\/15\/11","jsonHitCount":2,"seriesKey":"Website Usage"},{"jsonDate":"11\/16\/11","jsonHitCount":5,"seriesKey":"Website Usage"},{"jsonDate":"11\/17\/11","jsonHitCount":4,"seriesKey":"Website Usage"},{"jsonDate":"11\/21\/11","jsonHitCount":2,"seriesKey":"Website Usage"},{"jsonDate":"11\/22\/11","jsonHitCount":3,"seriesKey":"Website Usage"},{"jsonDate":"11\/23\/11","jsonHitCount":11,"seriesKey":"Website Usage"},{"jsonDate":"11\/24\/11","jsonHitCount":2,"seriesKey":"Website Usage"},{"jsonDate":"11\/25\/11","jsonHitCount":1,"seriesKey":"Website Usage"},{"jsonDate":"11\/28\/11","jsonHitCount":10,"seriesKey":"Website Usage"},{"jsonDate":"11\/29\/11","jsonHitCount":3,"seriesKey":"Website Usage"}]`
回答by nrabinowitz
You're trying to use d3.scale.linear()for dates, and that won't work. You need to use d3.time.scale()instead (docs):
您正在尝试使用d3.scale.linear()日期，但这是行不通的。您需要d3.time.scale()改用（docs）：
// helper function
function getDate(d) {
return new Date(d.jsonDate);
}
// get max and min dates - this assumes data is sorted
var minDate = getDate(data[0]),
maxDate = getDate(data[data.length-1]);
var x = d3.time.scale().domain([minDate, maxDate]).range([0, w]);
Then you don't need to deal with the time interval functions, you can just pass xa date:
那么你不需要处理时间间隔函数，你可以只传递x一个日期：
.attr("d", d3.svg.line()
.x(function(d) { return x(getDate(d)) })
.y(function(d) { return y(d.jsonHitCount) })
);
Working fiddle here: http://jsfiddle.net/nrabinowitz/JTrnC/
在这里工作小提琴：http: //jsfiddle.net/nrabinowitz/JTrnC/
