Draw Horizontal line on Bar Chart Chartjs - Javascript Chart.js

Javascript examples for Chart.js:Bar Chart

  1. HOME
  2. Javascript
  3. Chart.js
  4. Bar Chart

Description

Draw Horizontal line on Bar Chart Chartjs

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://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.2.1/Chart.min.js"></script> 
      <script type="text/javascript">
    window.onload=function(){/*from w w w  .  j  a  v  a 2  s  .  c  o  m*/
var ctx = document.getElementById("canvas");
Chart.pluginService.register({
    afterDraw: function(chart) {
        if (typeof chart.config.options.lineAt != 'undefined') {
           var lineAt = chart.config.options.lineAt;
            var ctxPlugin = chart.chart.ctx;
            var xAxe = chart.scales[chart.config.options.scales.xAxes[0].id];
            var yAxe = chart.scales[chart.config.options.scales.yAxes[0].id];
            if(yAxe.min != 0) return;
            ctxPlugin.strokeStyle = "red";
            ctxPlugin.beginPath();
            lineAt = (lineAt - yAxe.min) * (100 / yAxe.max);
            lineAt = (100 - lineAt) / 100 * (yAxe.height) + yAxe.top;
            ctxPlugin.moveTo(xAxe.left, lineAt);
            ctxPlugin.lineTo(xAxe.right, lineAt);
            ctxPlugin.stroke();
        }
    }
});
var myChart = new Chart(ctx, {
    type: 'bar',
    data: {
        labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
        datasets: [{
            label: '# of Votes',
            data: [12, 19, 3, 5, 2, 3],
            backgroundColor: [
                'rgba(255, 99, 132, 0.2)',
                'rgba(54, 162, 235, 0.2)',
                'rgba(255, 206, 86, 0.2)',
                'rgba(75, 192, 192, 0.2)',
                'rgba(153, 102, 255, 0.2)',
                'rgba(255, 159, 64, 0.2)'
            ],
            borderColor: [
                'rgba(255,99,132,1)',
                'rgba(54, 162, 235, 1)',
                'rgba(255, 206, 86, 1)',
                'rgba(75, 192, 192, 1)',
                'rgba(153, 102, 255, 1)',
                'rgba(255, 159, 64, 1)'
            ],
            borderWidth: 1
        }]
    },
    options: {
        lineAt: 14,
        scales: {
            yAxes: [{
                ticks: {
                    min: 0
                }
            }]
        }
    }
});
    }

      </script> 
   </head> 
   <body> 
      <canvas id="canvas" height="100"></canvas>  
   </body>
</html>

Related Tutorials