Dynamically Determine Color Based on Previous Value

<!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>
    html,
    body {
      height: 100%;
      width: 100%;
      margin: 0;
      padding: 0;
    }

    #myChart {
      height: 100%;
      width: 100%;
      min-height: 150px;
    }

    .zc-ref {
      display: none;
    }
  </style>
</head>

<body>
  <div id="myChart"><a class="zc-ref" href="https://www.zingchart.com">Powered by ZingChart</a></div>
  <script>
    ZC.LICENSE = ["569d52cefae586f634c54f86dc99e6a9", "b55b025e438fa8a98e32482b5f768ff5"];
    var myConfig = {
      type: 'bar',
      title: {
        text: 'Dynamically Determine Bar Color'
      },
      subtitle: {
        text: 'Color Determined by Previous Value'
      },
      series: [{
        values: [35, 42, 67, 89, 25, 34, 67, 25]
      }]
    };

    // define colors to se
    var baseColor = '#64b5f6';
    var increaseColor = '#81c784';
    var decreaseColor = '#e57373';

    // function to loop through series
    function applyStyles(seriesArray) {
      // base stays blue
      var stylesArray = [baseColor];

      // loop through series objects (multiple plots is possible)
      seriesArray.forEach(function(seriesObj) {
        if (seriesObj && seriesObj.values) {

          // add a color for each node based on increase or decreased value
          var prevValue = seriesObj.values[0];
          for (var i = 1; i < seriesObj.values.length; i++) {
            if (seriesObj.values[i] > prevValue) {
              stylesArray.push(increaseColor);
            } else {
              stylesArray.push(decreaseColor);
            }
            prevValue = seriesObj.values[i];
          }
          seriesObj.styles = stylesArray;
        }
      });
    }

    // when data is ready apply the rules to the chart
    zingchart.bind('myChart', 'dataparse', function(e, oGraph) {
      if (oGraph && oGraph.graphset[0])
        applyStyles(oGraph.graphset[0].series);

      return oGraph;
    });

    zingchart.render({
      id: 'myChart',
      data: myConfig,
      height: '100%',
      width: '100%'
    });
  </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"><a class="zc-ref" href="https://www.zingchart.com">Powered by ZingChart</a></div>
</body>

</html>

html,
body {
  height: 100%;
  width: 100%;
  margin: 0;
  padding: 0;
}

#myChart {
  height: 100%;
  width: 100%;
  min-height: 150px;
}

.zc-ref {
  display: none;
}

var myConfig = {
  type: 'bar',
  title: {
    text: 'Dynamically Determine Bar Color'
  },
  subtitle: {
    text: 'Color Determined by Previous Value'
  },
  series: [{
    values: [35, 42, 67, 89, 25, 34, 67, 25]
  }]
};

// define colors to se
var baseColor = '#64b5f6';
var increaseColor = '#81c784';
var decreaseColor = '#e57373';

// function to loop through series
function applyStyles(seriesArray) {
  // base stays blue
  var stylesArray = [baseColor];

  // loop through series objects (multiple plots is possible)
  seriesArray.forEach(function(seriesObj) {
    if (seriesObj && seriesObj.values) {

      // add a color for each node based on increase or decreased value
      var prevValue = seriesObj.values[0];
      for (var i = 1; i < seriesObj.values.length; i++) {
        if (seriesObj.values[i] > prevValue) {
          stylesArray.push(increaseColor);
        } else {
          stylesArray.push(decreaseColor);
        }
        prevValue = seriesObj.values[i];
      }
      seriesObj.styles = stylesArray;
    }
  });
}

// when data is ready apply the rules to the chart
zingchart.bind('myChart', 'dataparse', function(e, oGraph) {
  if (oGraph && oGraph.graphset[0])
    applyStyles(oGraph.graphset[0].series);

  return oGraph;
});

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