missing data points in line chart - Javascript Chart.js

Javascript examples for Chart.js:Line Chart

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Description

missing data points in line chart

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-1.9.1.js"></script> 
      <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.7.3/Chart.js"></script> 
      <script type="text/javascript">
    $(window).load(function(){//from w  w w .  jav a  2 s. c  om
var config = {
  type: 'line',
  data: {
    labels: ['Jan\n2018', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'],
    datasets: [{
      label: 'Red',
      borderColor: '#FF0000',
      backgroundColor: '#FF0000',
      data: [
        10, 20, 30, 40, 50, 60, undefined, 80, 90, 100, 90, 80
      ],
    }, {
      label: 'Blue',
      borderColor: '#0000FF',
      backgroundColor: '#0000FF',
      data: [
        10, 20, undefined, 40, 50, 60, 70, 80, 92, undefined, 90, 80
      ],
    }]
  },
  options: {
    spanGaps: true,
    responsive: true,
    maintainAspectRatio: false,
    title: {
      display: true,
      text: 'Chart.js Line Chart - Stacked Area'
    },
    tooltips: {
      mode: 'index',
    },
    hover: {
      mode: 'index'
    },
    scales: {
      xAxes: [{
        scaleLabel: {
          display: true,
          labelString: 'Month'
        }
      }],
      yAxes: [{
        stacked: true,
        scaleLabel: {
          display: true,
          labelString: 'Value'
        }
      }]
    }
  }
};
var ctx1 = document.getElementById('canvas').getContext('2d');
var myChart = new Chart(ctx1, config);
$("#on").on("click", function() {
  myChart.options.spanGaps=true;
  myChart.update();
});
$("#off").on("click", function() {
  myChart.options.spanGaps=false;
  myChart.update();
});
    });

      </script> 
   </head> 
   <body> 
      <div style="width:100%; height:300px"> 
         <canvas id="canvas" style="width:100%; height:300px"></canvas> 
      </div> 
      <button id="on"> Span Gaps=true </button> 
      <button id="off"> Span Gaps=false </button>  
   </body>
</html>

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