HELP CENTER CHECKBOXES FOR LEGEND

<!DOCTYPE html>
<html>

<head>
  <meta charset="utf-8">
  <title>ZingSoft Demo</title>

  <script nonce="undefined" src="https://cdn.zingchart.com/zingchart.min.js"></script>
  <style></style>
</head>

<body>
  <div id='myChart'></div>
  <input data-index='0' type='checkbox' id='pa' checked>
  <label for='pa'>Dataset 1</label>
  <input data-index='1' type='checkbox' id='pb' checked>
  <label for='pa'>Dataset 2</label>
  <input data-index='2' type='checkbox' id='pc' checked>
  <label for='pa'>Dataset 3</label>
  <input data-index='3' type='checkbox' id='pd' checked>
  <label for='pa'>Dataset 4</label>
  <script>
    ZC.LICENSE = ["569d52cefae586f634c54f86dc99e6a9", "b55b025e438fa8a98e32482b5f768ff5"];
    let myConfig = {
      type: 'line',
      plotarea: {
        margin: 'dynamic'
      },
      series: [{
          values: [35, 42, 67, 89, 25, 34, 67, 85],
          scales: 'scale-x,scale-y',
          palette: 0
        },
        {
          values: [135, 142, 167, 189, 125, 134, 167, 185],
          scales: 'scale-x,scale-y-2',
          palette: 1
        },
        {
          values: [535, 542, 767, 789, 625, 934, 267, 485],
          scales: 'scale-x,scale-y-3',
          palette: 2
        },
        {
          values: [2235, 1242, 3467, 8539, 2225, 3134, 6742, 7585],
          scales: 'scale-x,scale-y-4'
        }
      ],
      noData: {
        text: 'Please Click A Checkbox Below To Load Data'
      },
      scaleY2: {},
      scaleY3: {},
      scaleY4: {}
    };

    zingchart.render({
      id: 'myChart',
      data: myConfig,
      height: 400,
      width: '100%'
    });


    // get all inputs
    let inputSelectors = document.querySelectorAll('input');

    inputSelectors.forEach(function(input) {
      input.addEventListener('click', updateChartData);
    });

    function updateChartData(e) {
      let seriesIndex = this.dataset['index'];

      zingchart.exec('myChart', 'toggleplot', {
        plotindex: seriesIndex
      });
    };
  </script>
</body>

</html>

<!DOCTYPE html>
<html>

<head>
  <meta charset="utf-8">
  <title>ZingSoft Demo</title>

  <script src="https://cdn.zingchart.com/zingchart.min.js"></script>
</head>

<body>
  <div id='myChart'></div>
  <input data-index='0' type='checkbox' id='pa' checked>
  <label for='pa'>Dataset 1</label>
  <input data-index='1' type='checkbox' id='pb' checked>
  <label for='pa'>Dataset 2</label>
  <input data-index='2' type='checkbox' id='pc' checked>
  <label for='pa'>Dataset 3</label>
  <input data-index='3' type='checkbox' id='pd' checked>
  <label for='pa'>Dataset 4</label>
</body>

</html>

let myConfig = {
  type: 'line',
  plotarea: {
    margin: 'dynamic'
  },
  series: [{
      values: [35, 42, 67, 89, 25, 34, 67, 85],
      scales: 'scale-x,scale-y',
      palette: 0
    },
    {
      values: [135, 142, 167, 189, 125, 134, 167, 185],
      scales: 'scale-x,scale-y-2',
      palette: 1
    },
    {
      values: [535, 542, 767, 789, 625, 934, 267, 485],
      scales: 'scale-x,scale-y-3',
      palette: 2
    },
    {
      values: [2235, 1242, 3467, 8539, 2225, 3134, 6742, 7585],
      scales: 'scale-x,scale-y-4'
    }
  ],
  noData: {
    text: 'Please Click A Checkbox Below To Load Data'
  },
  scaleY2: {},
  scaleY3: {},
  scaleY4: {}
};

zingchart.render({
  id: 'myChart',
  data: myConfig,
  height: 400,
  width: '100%'
});


// get all inputs
let inputSelectors = document.querySelectorAll('input');

inputSelectors.forEach(function(input) {
  input.addEventListener('click', updateChartData);
});

function updateChartData(e) {
  let seriesIndex = this.dataset['index'];

  zingchart.exec('myChart', 'toggleplot', {
    plotindex: seriesIndex
  });
};