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Google Charts API Using Database in ASP.Net

Google Charts API Using Database in ASP.Net

This article introduces use of the Google Charts API with a database in ASP.NET. Google has a jQuery API for chart and graph visuals. I have explored a little more and used them with a SQL Server database data and simply plunged chart data with jQuery into an aspx page and it works.

Step1 : .aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Charts Example</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<script type="text/javascript" src="https://www.google.com/jsapi"></script>
<br />
<br />
<asp:Literal ID="ltScripts" runat="server"></asp:Literal>
<div id="chart_div" style="width: 660px; height: 400px;">
</div>
</div>
</form>
</body>
</html>

Step 2 : .aspx.cs


#region " [ Using ] "
using System;
using System.Web.UI;
using System.Data.SqlClient;
using System.Data;
using System.Configuration;
using System.Text;
#endregion


public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
// Bind Charts
BindChart();
}
}

private void BindChart()
{
DataTable dsChartData = new DataTable();
StringBuilder strScript = new StringBuilder();

try
{
dsChartData = GetChartData();

strScript.Append(@"<script type='text/javascript'>
google.load('visualization', '1', {packages: ['corechart']});</script>
<script type='text/javascript'>
function drawVisualization() {
var data = google.visualization.arrayToDataTable([
['Month', 'Bolivia', 'Ecuador', 'Madagascar', 'Average'],");

foreach (DataRow row in dsChartData.Rows)
{
strScript.Append("['" + row["Month"] + "'," + row["Bolivia"] + "," +
row["Ecuador"] + "," + row["Madagascar"] + "," + row["Avarage"] + "],");
}
strScript.Remove(strScript.Length - 1, 1);
strScript.Append("]);");

strScript.Append("var options = { title : 'Monthly Coffee Production by Country', vAxis: {title: 'Cups'}, hAxis: {title: 'Month'}, seriesType: 'bars', series: {3: {type: 'area'}} };");
strScript.Append(" var chart = new google.visualization.ComboChart(document.getElementById('chart_div')); chart.draw(data, options); } google.setOnLoadCallback(drawVisualization);");
strScript.Append(" </script>");

ltScripts.Text = strScript.ToString();
}
catch
{
}
finally
{
dsChartData.Dispose();
}
}
}

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