line chart with ChartJS

by Andres Abadia

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.4.0/Chart.bundle.min.js"></script>
    <div class="chartWrapper">
      <div class="chartAreaWrapper">
        <div class="chartAreaWrapper2">
            <canvas id="myChart"></canvas>
        </div>
      </div>
        
        <canvas id="myChartAxis" height="300" width="0"></canvas>
    </div>

CSS

.chartWrapper {
            position: relative;
            
        }

        .chartWrapper > canvas {
            position: absolute;
            left: 0;
            top: 0;
            pointer-events:none;
        }
.chartAreaWrapper {
          overflow-x: scroll;
            position: relative;
            width: 100%;
        }

        .chartAreaWrapper2 {
          
            position: relative;
            height: 300px;
        }

JavaScript

//https://github.com/chartjs/Chart.js/issues/2958#issuecomment-261949718

var ctx = document.getElementById("myChart").getContext("2d");

        var chart = {
        options: {
          responsive: true,
          maintainAspectRatio: false,
          animation: {
                    
                    onComplete: function(animation) {
                        var sourceCanvas = myLiveChart.chart.canvas;
                        var copyWidth = myLiveChart.scales['y-axis-0'].width - 10;
                        var copyHeight = myLiveChart.scales['y-axis-0'].height + myLiveChart.scales['y-axis-0'].top + 10;
                        var targetCtx = document.getElementById("myChartAxis").getContext("2d");
                        targetCtx.canvas.width = copyWidth;
                targetCtx.drawImage(sourceCanvas, 0, 0, copyWidth, copyHeight, 0, 0, copyWidth, copyHeight);
                    }
                }
      },
        type: 'bar',
        data: {
            labels: ["January", "February", "March", "April", "May", "June", "July"],
            datasets: [
                {
                    label: "My First dataset",
                    fillColor: "rgba(220,220,220,0.2)",
                    strokeColor: "rgba(220,220,220,1)",
                    pointColor: "rgba(220,220,220,1)",
                    pointStrokeColor: "#fff",
                    pointHighlightFill: "#fff",
                    pointHighlightStroke: "rgba(220,220,220,1)",
                    data: [65, 59, 80, 81, 56, 55, 40]
                }
            ]
        }};

   var myLiveChart = new Chart(ctx, chart);