图表JS - 为xAxes使用时间

Question

我添加了这段代码

scales: 
{
        xAxes: 
        [{
            type: 'time',
            time: 
            {
                unit: 'month',
                displayFormats: { month: 'MM' },
                max: '2017-10-09 18:43:53',
                min: '2017-10-02 18:43:53'
            }
        }]
},

选项,但它不起作用.我有什么想法吗？

FIDDLE - > https://jsfiddle.net/o473y9pw/

Answer 1

由于您希望将时间用于x轴,因此您的labels数组应该是日期/时间字符串labels数组(数组与x轴相对应).

您还需要设置parser属性(正确地解析日期/时间),以及x轴滴答声源到(适当地产生x轴蜱).data

UPDATE

如果你只有一个最小和最大日期,你可以创建一个漂亮的小插件来动态填充labels (日期)数组,如下所示:

plugins: [{
   beforeInit: function(chart) {
      var time = chart.options.scales.xAxes[0].time, // 'time' object reference
         // difference (in days) between min and max date
         timeDiff = moment(time.max).diff(moment(time.min), 'd');
      // populate 'labels' array
      // (create a date string for each date between min and max, inclusive)
      for (i = 0; i <= timeDiff; i++) {
         var _label = moment(time.min).add(i, 'd').format('YYYY-MM-DD HH:mm:ss');
         chart.data.labels.push(_label);
      }
   }
}]

^{注意: moment.js用于简化计算.}

ᴡᴏʀᴋɪɴɢᴇxᴀᴍᴘʟᴇ ⧩
^{(用于演示目的,我已经改变了时间unit到day)}

$(document).ready(function() {

   new Chart(document.getElementById("chartBox"), {
      type: 'line',
      data: {
         datasets: [{
            data: [12, 19, 3, 5, 2, 3, 32, 15],
            label: "",
            borderWidth: 2,
            borderColor: "#3e95cd",
            fill: false,
            pointRadius: 0
         }]
      },
      options: {
         scales: {
            xAxes: [{
               type: 'time',
               time: {
                  parser: 'YYYY-MM-DD HH:mm:ss',
                  unit: 'day',
                  displayFormats: {
                     day: 'ddd'
                  },
                  min: '2017-10-02 18:43:53',
                  max: '2017-10-09 18:43:53'
               },
               ticks: {
                  source: 'data'
               }
            }]
         },
         legend: {
            display: false
         },
         animation: {
            duration: 0,
         },
         hover: {
            animationDuration: 0,
         },
         responsiveAnimationDuration: 0
      },
      plugins: [{
         beforeInit: function(chart) {
            var time = chart.options.scales.xAxes[0].time, // 'time' object reference
               timeDiff = moment(time.max).diff(moment(time.min), 'd'); // difference (in days) between min and max date
            // populate 'labels' array
            // (create a date string for each date between min and max, inclusive)
            for (i = 0; i <= timeDiff; i++) {
               var _label = moment(time.min).add(i, 'd').format('YYYY-MM-DD HH:mm:ss');
               chart.data.labels.push(_label);
            }
         }
      }]
   });

});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/moment@latest/moment.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.7.0/Chart.min.js"></script>

<canvas id="chartBox"></canvas>

Answer 2

数据集应该是对象的数组，对象的属性为x，时间为y。您还能如何绘制图表，对吗？

$(document).ready(function() {
  var data = [{
      x: new moment().add(-10, "months"),
      y: Math.random() * 100
    },
    {
      x: new moment().add(-8, "months"),
      y: Math.random() * 100
    },
    {
      x: new moment().add(-6, "months"),
      y: Math.random() * 100
    },
    {
      x: new moment().add(-4, "months"),
      y: Math.random() * 100
    },
    {
      x: new moment().add(-2, "months"),
      y: Math.random() * 100
    },
    {
      x: new moment().add(-0, "months"),
      y: Math.random() * 100
    },
  ];

  new Chart(document.getElementById("chartBox"), {
    type: 'line',
    data: {
      datasets: [{
        data: data,
        borderColor: "#3e95cd",
        fill: false
      }]
    },
    options: {
      scales: {
        xAxes: [{
          type: 'time'
        }]
      },
      legend: false
    }
  });
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.0/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.18.1/moment.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.7.0/Chart.bundle.min.js"></script>

<canvas id="chartBox"></canvas>

小提琴