Chart js show/hide legend - Javascript Chart.js

Javascript examples for Chart.js:Legend

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Description

Chart js show/hide legend

Demo Code

ResultView the demo in separate window 

<html lang="en">
   <head> 
      <title>Chart.js - Hide/Show Legend From Button Click</title> 
   </head> 
   <body translate="no"> 
      <div style="width:45%;"> 
         <canvas id="canvas"></canvas> 
         <button id="hideLEgend">Hide/Show Legend</button> 
      </div> 
      <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/2.5.0/Chart.min.js"></script> 
      <script>
      window.chartColors = {/*from   www  .  j a v  a2s. c  om*/
  red: 'rgb(255, 99, 132)',
  orange: 'rgb(255, 159, 64)',
  yellow: 'rgb(255, 205, 86)',
  green: 'rgb(75, 192, 192)',
  blue: 'rgb(54, 162, 235)',
  purple: 'rgb(153, 102, 255)',
  grey: 'rgb(231,233,237)'
};
var randomScalingFactor = function() {
  return (Math.random() > 0.5 ? 1.0 : 1.0) * Math.round(Math.random() * 100);
};
var line1 = [randomScalingFactor(), randomScalingFactor(), randomScalingFactor(), randomScalingFactor(), randomScalingFactor(), randomScalingFactor(), randomScalingFactor(), randomScalingFactor(), randomScalingFactor(), randomScalingFactor(), randomScalingFactor(), randomScalingFactor(), ];
var line2 = [randomScalingFactor(), randomScalingFactor(), randomScalingFactor(), randomScalingFactor(), randomScalingFactor(), randomScalingFactor(), randomScalingFactor(), randomScalingFactor(), randomScalingFactor(), randomScalingFactor(), randomScalingFactor(), randomScalingFactor(), ];
var MONTHS = ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"];
var config = {
  type: 'line',
  data: {
    labels: MONTHS,
    datasets: [{
      label: "My First dataset",
      backgroundColor: window.chartColors.red,
      borderColor: window.chartColors.red,
      data: line1,
      fill: false,
    }, {
      label: "My Second dataset",
      backgroundColor: window.chartColors.blue,
      borderColor: window.chartColors.blue,
      data: line2,
      fill: false,
    }]
  },
  options: {
    responsive: true,
    title:{
      display:true,
      text:'Chart.js - Hide/Show Legend From Button Click'
    },
    tooltips: {
      mode: 'index',
      intersect: false,
    },
    hover: {
      mode: 'nearest',
      intersect: true
    },
    scales: {
      xAxes: [{
        display: true,
        scaleLabel: {
          display: true,
          labelString: 'Month'
        }
      }],
      yAxes: [{
        display: true,
        scaleLabel: {
          display: true,
        },
      }]
    }
  }
};
var ctx = document.getElementById("canvas").getContext("2d");
var myLine = new Chart(ctx, config);
document.getElementById('hideLEgend').addEventListener('click', function() {
  myLine.options.legend.display = !myLine.options.legend.display;
  myLine.update();
});
      //# sourceURL=pen.js
    
      </script>  
   </body>
</html>

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