Chart.js条形图和折线图 [英] Chart.js Bar and Line chart

问题描述

我正在尝试使用Chart.js创建条形图和折线图，但我希望条形图具有一组不同的标签。

I'm trying to create a bar and line chart using Chart.js, but I wanted to bar chart to have a different set of 'labels'.

折线图的数据位于第一个点和最后一个点[2800，1300]上，我希望折线穿过条形图的标签。

the data for the line chart is on the first and last point [2800, 1300] and I wanted the line to draw across the labels of the bar chart.

这是

预期

结果

推荐答案

我能够通过扩展Chartjs来解决此问题。

I was able to solve this by extending Chartjs.

var originalLineDraw = Chart.controllers.bar.prototype.draw;
Chart.helpers.extend(Chart.controllers.bar.prototype, {
  draw: function() {
    originalLineDraw.apply(this, arguments);

    var chart = this.chart;
    var ctx = chart.chart.ctx;

    var index = chart.config.data.lineAtIndex;
    if (index) {
      var xaxis = chart.scales['x-axis-0'];
      var yaxis = chart.scales['y-axis-0'];

      ctx.save();
      ctx.beginPath();
      ctx.moveTo(xaxis.getPixelForValue(undefined, 0), yaxis.getPixelForValue(70));
      ctx.strokeStyle = '#000000';
      ctx.lineTo(xaxis.getPixelForValue(undefined, 7), yaxis.getPixelForValue(10));
      ctx.stroke();
      ctx.restore();
    }
  }
});

var config = {
  type: 'bar',
  data: {
    labels: ["January", "February", "March", "April", "May", "June", "July"],
    datasets: [{
      label: "My First dataset",
      data: [65, 0, 80, 81, 56, 85, 40],
      fill: false
    }],
    lineAtIndex: 2
  }
};

var ctx = document.getElementById("myChart").getContext("2d");
new Chart(ctx, config);

<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.0.0-beta/Chart.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<canvas id="myChart"></canvas>

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