HELP CENTER CHECKBOXES FOR LEGEND

<!DOCTYPE html>
<html>

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

  <script 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"];
    var myConfig = {
      "graphset": [{
        "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"
          }
        ],
        "no-data": {
          "text": "Please Click A Checkbox Below To Load Data"
        },
        "scale-y-2": {

        },
        "scale-y-3": {

        },
        "scale-y-4": {

        }
      }],
      "tween": null
    };

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


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

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

    function updateChartData(e) {
      var 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>

var myConfig = {
  "graphset": [{
    "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"
      }
    ],
    "no-data": {
      "text": "Please Click A Checkbox Below To Load Data"
    },
    "scale-y-2": {

    },
    "scale-y-3": {

    },
    "scale-y-4": {

    }
  }],
  "tween": null
};

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


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

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

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

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