Question

如何根据d3.js中的日期制作我的线x轴？

我试图教自己如何使用d3.js.我一直在查看随附的示例，并尝试使用json传递的数据重新创建折线图。我能够将数据输入到折线图中，但x轴应该是日期而不是数字。我正在使用的日期格式是MM / DD / YY，但图表将所有内容都绘制为0.我的json数据很好，但是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。我希望有人可以给我一个例子，或者能够解释我如何使它发挥作用。

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);
  });

我的行动打印出的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"}]`

Answer 1

您正在尝试将d3.scale.linear()用于日期，但这不起作用。您需要使用d3.time.scale()代替（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]);

然后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) })
);

在这里工作小提琴：http://jsfiddle.net/nrabinowitz/JTrnC/

处理d3.js轴上的日期

1 个答案: