Creating visually appealing Stacked Bar Charts with Google Charts: Adding unique colors to each section of the bar

I have been working on creating a stacked bar chart using the Google API. Each bar will be divided into 3 sections representing Negative, Neutral, and Positive feedback that we have received.

Here is a snippet of my data and options code:

 data = google.visualization.arrayToDataTable([
              ['Category', 'Negative', 'Neutral', 'Positive'],
              ['icon', 10, 800, 5],
              ['colour', 5, 5, 5],
              ['copy', 5, 5, 5],
              ['navigation', 5, 5, 5]
            ]);
        };
   options = {
        isStacked: true,
        width: '100%',
        height: 400,
        hAxis: {title: 'Category', textStyle: {bold : true, fontSize: 24}, titleTextStyle: {color: 'White'}},
        vAxis: {title: 'Responses', textStyle: {bold : true, fontSize: 24}, titleTextStyle: {color: 'White'}}
        };
  var chart = new google.charts.Bar(document.getElementById('categoryChart'));
        chart.draw(data, google.charts.Bar.convertOptions(options));

I am trying to adjust the color scheme by including an array in the options like this:

colors:['red','blue', 'green'].

However, this only assigns the first color (red) to the entire bars instead of individual slices within them.

Do you have any suggestions on how I can control the colors for each part of the bar chart?

Thanks,

Adam

javascriptchartsgoogle-visualization

Answer №1

Modifying the color style can be achieved in the following manner :

data = google.visualization.arrayToDataTable([
          ['Category', 'Negative', 'Neutral', 'Positive', { role: 'style' }],
          ['icon', 10, 800, 5, '#b87333'],
          ['colour', 5, 5, 5, 'silver'],
          ['copy', 5, 5, 5, 'gold'],
          ['navigation', 5, 5, 5, 'color: #e5e4e2']
      ]);

Update :

The issue arises in this line :

var chart = new google.charts.Bar(document.getElementById('categoryChart'));

You are using google.charts.Bar instead of google.visualization.ColumnChart

Working example :

google.load('visualization', '1', {
    packages: ['corechart', 'bar']
});
google.setOnLoadCallback(drawBarColors);

function drawBarColors() {
    var data = google.visualization.arrayToDataTable([
        ['Category', 'Negative', 'Neutral', 'Positive'],
        ['icon', 10, 100, 5],
        ['colour', 5, 5, 5],
        ['copy', 5, 5, 5],
        ['navigation', 5, 5, 5]
    ]);

    var options = {
        isStacked: true,
        width: '100%',
        height: 400,
        colors: ['red', 'blue', 'green'],
        hAxis: {
            title: 'Category',
            textStyle: {
                bold: true,
                fontSize: 24
            },
            titleTextStyle: {
                color: 'White'
            }
        },
        vAxis: {
            title: 'Responses',
            textStyle: {
                bold: true,
                fontSize: 24
            },
            titleTextStyle: {
                color: 'White'
            }
        },

    };

    var chart = new google.visualization.ColumnChart(document.getElementById('chart_div'));
    chart.draw(data, options);
}
  <script type="text/javascript" src="https://www.google.com/jsapi"></script>
  <div id="chart_div"><div>

Reference

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