Table of Contents

Google Charts – Configuration Syntax

”;

In this chapter we”ll showcase the configuration required to draw a chart using Google Chart API.

Step 1: Create HTML Page

Create an HTML page with the Google Chart libraries.

googlecharts_configuration.htm

<html>
   <head>
      <title>Google Charts Tutorial</title>
      <script type = "text/javascript" src = "https://www.gstatic.com/charts/loader.js">
      </script>
      <script type = "text/javascript">
         google.charts.load(''current'', {packages: [''corechart'']});     
      </script>
   </head>
   
   <body>
      <div id = "container" style = "width: 550px; height: 400px; margin: 0 auto">
      </div>
   </body>
</html>

Here container div is used to contain the chart drawn using Google Chart library. Here we are loading the latest version of corecharts API using google.charts.load method.

Step 2: Create configurations

Google Chart library uses very simple configurations using json syntax.

// Instantiate and draw the chart.
var chart = new google.visualization.PieChart(document.getElementById(''container''));
chart.draw(data, options);

Here data represents the json data and options represents the configuration which Google Chart library uses to draw a chart withing container div using draw() method. Now we”ll configure the various parameter to create the required json string.

title

Configure the options of the chart.

// Set chart options
var options = {''title'':''Browser market shares at a specific website, 2014'',
   ''width'':550,
   ''height'':400};

DataTable

Configure the data to be displayed on the chart. DataTable is a special table structured collection which contains the data of the chart. Columns of data table represents the legends and rows represents the corresponding data. addColumn() method is used to add a column where first parameter represents the data type and second parameter represents the legend. addRows() method is used to add rows accordingly.

// Define the chart to be drawn.
var data = new google.visualization.DataTable();
data.addColumn(''string'', ''Browser'');
data.addColumn(''number'', ''Percentage'');
data.addRows([
   [''Firefox'', 45.0],
   [''IE'', 26.8],
   [''Chrome'', 12.8],
   [''Safari'', 8.5],
   [''Opera'', 6.2],
   [''Others'', 0.7]
]);

Step 3: Draw the chart

// Instantiate and draw the chart.
var chart = new google.visualization.PieChart(document.getElementById(''container''));
chart.draw(data, options);

Example

Following is the complete example −