Working with Google Chart Tools : Create a Geochart

Geochart can be a handy tool if you want to represent the demographic behavior of your service. In my recent project for Bangladesh Post Office I used this tool to represent the usage of their service in each Division of Bangladesh. Another big example is the Google Analytics where you can view the location based visitor information of your site. Here I am going to show you how you can use this in your project.

First load the Google's Javascript API
<script src="" type="text/javascript">  

Now create a DIV element and give it an ID. This id will be required when you create the chart object to display in this div.

<div id="map">

In your Javascript code first load the geomap package and set the onLoadCallback method name.

<script type="text/javascript">
 google.load('visualization', '1', { 'packages': ['geomap'] });

In the callback method first create a DataTable object add two columns. Just give a suitable name as per your requirement.

 function drawGeoChart() {
            var data = new google.visualization.DataTable();
            data.addColumn('string', 'Country');
            data.addColumn('number', 'Visit');

Now set some value to the DataTable. The first column can be an Address, country name, region name locations, or US metropolitan area codes. For country and region name follow this ISO-3166 code or text equivalent to the code. The second column will be the value of the area.

            data.setValue(0, 0, 'Germany');
            data.setValue(0, 1, 600);
            data.setValue(1, 0, 'United States');
            data.setValue(1, 1, 500);
            data.setValue(2, 0, 'Bangladesh');
            data.setValue(2, 1, 400);
            data.setValue(3, 0, 'Canada');
            data.setValue(3, 1, 200);
            data.setValue(4, 0, 'France');
            data.setValue(4, 1, 200);
            data.setValue(5, 0, 'RU');
            data.setValue(5, 1, 300);
Finally configure some property of the chart and draw it using the data previously set.
  var regionOptions = {};
  regionOptions['width'] = '400';
  regionOptions['height'] = '250';
  // Look the div id is used here to create the chart object 
  var regionChart = new  google.visualization.GeoMap(document.getElementById('map'));
  regionChart.draw(data, regionOptions);
And here is the outcome. On mouse over you can view the data of the area

You can load the chart data by a webservice call. For C# see my previous blog. Visit this link to know more about Geochart.


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