在chart.js

Question

我设计了一个带chart.js的简单图表，看起来很酷。

但现在我想在一个月到另一个月之间显示他们的数据。

表示他们正在关注数据：

2017年1月1日：12

2017年1月3日：16

等等..

现在我想将1月到2月的数据显示为图像，如下所示：

这是我的简单代码

    var ctx = document.getElementById('myChart').getContext('2d');
var chart = new Chart(ctx, {
    // The type of chart we want to create
    type: 'line',

    // The data for our dataset
    data: {
        labels: ["January 2017", "February 2017", "March 2017", "April 2017", "May 2017", "June 2017", "July 2017"],
        datasets: [{
            label: "My First dataset",
            backgroundColor: 'rgb(255, 99, 132,0.25)',
            borderColor: 'rgb(255, 99, 132)',
            data: [0, 10, 5, 2, 20, 30, 15],
            lineTension:0
        }]
    },

    // Configuration options go here
    options: {}
});

jsfiddle Here ：https://jsfiddle.net/2qxj9t00/2/

我已经谷歌这么多次，但他们没有任何解决方案，所以善意地建议我。谢谢:)）

Answer 1

您可以使用以下x轴刻度回调函数来完成此操作...

ticks: {
   callback: function(e) {
      var tick = e.match(/(Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sept|Oct|Nov|Dec).*?\d+/g)[0];
      if (tick != aR) {
         aR = tick;
         return tick;
      }
   }
}

假设您的标签数组看起来有点像.. ["1st January 2017", "3rd January 2017", "4th February 2017", ...]

ᴡᴏʀᴋɪɴɢᴡᴏʀᴋɪɴɢxᴀᴍᴘʟᴇ

var aR = null;	//store already returned tick
var ctx = document.getElementById('myChart').getContext('2d');
var chart = new Chart(ctx, {
   type: 'line',
   data: {
      labels: ["1st January 2017", "3rd January 2017", "4th February 2017", "9th February 2017", "3rd March 2017", "15th March 2017"],
      datasets: [{
         label: "My First dataset",
         backgroundColor: 'rgba(255, 99, 132, 0.5)',
         borderColor: 'rgb(255, 99, 132)',
         data: [12, 16, 10, 11, 9, 15],
         lineTension: 0
      }]
   },
   options: {
      scales: {
         xAxes: [{
            ticks: {
               autoSkip: false,
               callback: function(e) {
                  var tick = e.match(/(Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sept|Oct|Nov|Dec).*?\d+/g)[0];
                  if (tick != aR) {
                     aR = tick;
                     return tick;
                  }
               }
            }
         }],
         yAxes: [{
            ticks: {
               min: 0,
               max: 30
            }
         }]
      }
   }
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.6.0/Chart.min.js"></script>
<canvas id="myChart" height="200"></canvas>