Draw horizontal lines in Chart.js - Javascript Chart.js

Javascript examples for Chart.js:Line Chart

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Description

Draw horizontal lines in Chart.js

Demo Code

ResultView the demo in separate window 

<html>
   <head> 
      <meta name="viewport" content="width=device-width, initial-scale=1"> 
      <script type="text/javascript" src="https://code.jquery.com/jquery-2.1.3.js"></script> 
      <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.1.6/Chart.bundle.min.js"></script> 
      <script type="text/javascript">
    $(window).load(function(){//from  www  . j a  va  2 s  .  c  o  m
var canvas = document.getElementById("myChart");
var ctx = canvas.getContext("2d");
var horizonalLinePlugin = {
  afterDraw: function(chartInstance) {
    var yScale = chartInstance.scales["y-axis-0"];
    var canvas = chartInstance.chart;
    var ctx = canvas.ctx;
    var index;
    var line;
    var style;
    if (chartInstance.options.horizontalLine) {
      for (index = 0; index < chartInstance.options.horizontalLine.length; index++) {
        line = chartInstance.options.horizontalLine[index];
        if (!line.style) {
          style = "rgba(169,169,169, .6)";
        } else {
          style = line.style;
        }
        if (line.y) {
          yValue = yScale.getPixelForValue(line.y);
        } else {
          yValue = 0;
        }
        ctx.lineWidth = 3;
        if (yValue) {
          ctx.beginPath();
          ctx.moveTo(0, yValue);
          ctx.lineTo(canvas.width, yValue);
          ctx.strokeStyle = style;
          ctx.stroke();
        }
        if (line.text) {
          ctx.fillStyle = style;
          ctx.fillText(line.text, 0, yValue + ctx.lineWidth);
        }
      }
      return;
    };
  }
};
Chart.pluginService.register(horizonalLinePlugin);
var data = {
  labels: ["January", "February", "March", "April", "May", "June", "July"],
  datasets: [{
    label: "My First dataset",
    fill: false,
    lineTension: 0.1,
    backgroundColor: "rgba(75,192,192,0.4)",
    borderColor: "rgba(75,192,192,1)",
    borderCapStyle: 'butt',
    borderDash: [],
    borderDashOffset: 0.0,
    borderJoinStyle: 'miter',
    pointBorderColor: "rgba(75,192,192,1)",
    pointBackgroundColor: "#fff",
    pointBorderWidth: 1,
    pointHoverRadius: 5,
    pointHoverBackgroundColor: "rgba(75,192,192,1)",
    pointHoverBorderColor: "rgba(220,220,220,1)",
    pointHoverBorderWidth: 2,
    pointRadius: 1,
    pointHitRadius: 10,
    data: [65, 59, 80, 81, 56, 55, 40],
  }]
};
var myChart = new Chart(ctx, {
  type: 'line',
  data: data,
  options: {
    "horizontalLine": [{
      "y": 82,
      "style": "rgba(255, 0, 0, .4)",
      "text": "max"
    }, {
      "y": 60,
      "style": "#00ffff",
    }, {
      "y": 44,
      "text": "min"
    }]
  }
});
    });

      </script> 
   </head> 
   <body> 
      <canvas id="myChart" width="400" height="400"></canvas>  
   </body>
</html>

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