Tuesday, 9 August 2011

Line chart in asp.net


Introduction: Hello dears, in this article i will explain that how we can create Visualization: line Chart using asp.net. This is very helpful artucle for the asp.net deveploer to creating a mast graph in asp.net. This type of chart you can create to showing purchase and sale or sale and expences or yes or no etc in different years.

Implementation: Here i am taking the reference from the below link . http://code.google.com/apis/chart/interactive/docs/gallery/barchart.html
Google use javascript code for the implementation of this graph. I am using same javascript code but am giving also my asp.net experience with this code. And create the same graph in Asp.Net.
Code for .aspx page:
<head id="Head1" runat="server">
<title>Bar Graph using Google Visualization</title>
         <%--the below two javascripts  are needed to run this program you can
      also download this script from the below link --%>

     <script type="text/javascript" src="https://www.google.com/jsapi"></script>
</head>
<body>
    <form id="form1" runat="server">
  <div>

        <asp:Literal ID="lt" runat="server"></asp:Literal>
    </div>
   
    <div id="chart_div"></div>

    </form>
</body>
Code for aspx.cs page:

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Data.SqlClient;
using System.Text;


public partial class chart_sale_purchage : System.Web.UI.Page
{
    // complete code of Visualization: Combo Chart
    SqlConnection con = new SqlConnection();
    // here am declairing the stringbuilder class
    StringBuilder str = new StringBuilder();
    protected void Page_Load(object sender, EventArgs e)
    {
        // here i am declare connection 
        con.ConnectionString = ConfigurationManager.ConnectionStrings["cn"].ConnectionString;
        con.Open();
        if (Page.IsPostBack == false)
        {
            // here i am calling function  chart_bind(); in the page load event of the page
            chart_bind();
        }

    }
    private void chart_bind()
    {
        // here i am using SqlDataAdapter for the sql server select query
        SqlDataAdapter adp = new SqlDataAdapter("select top(7)* from tb_exp", con);
        // here am taking datatable
        DataTable dt = new DataTable();
        try
        {
            // here datatale dt is fill wit the adp
            adp.Fill(dt);
            // this string m catching in the stringbuilder class
            // in the str m writing same javascript code that is given by the google.
            // but m changing  only below line
            //data.addColumn('string'(datatype), 'Year'(columnname according to the sql table));
            //data.addColumn('number'(datatype), 'Sales'(columnname according to the sql table));
            //data.addColumn('number'(datatype), 'Expenses'(columnname according to the sql table));
            // my data that will come from the sql server
            // in the below line i need " in place of *
            // stringbuilder can't return us " so at the last line i am
            // replacing * with the " using Replace('*', '"'); function
            // and other code is same like the google code
            str.Append(@"<script type=text/javascript> google.load( *visualization*, *1*, {packages:[*corechart*]});
      google.setOnLoadCallback(drawChart);
      function drawChart() {
        var data = new google.visualization.DataTable();
        data.addColumn('string', 'Year');
        data.addColumn('number', 'Sales');
        data.addColumn('number', 'Expenses');

        data.addRows(" + dt.Rows.Count + ");");

            Int32 i;
            //here i am using for loop to fetch multiple recorod from the database
            for (i = 0; i <= dt.Rows.Count - 1; i++)
            {
                // i need this type of output " data.setValue(0, 0, '2004');",(1, 0, '2005');" * so on  in the first line so for this
                //m using i for the 1& 2 and so on . and after this i am writting zero and after this year using datatable
                str.Append("data.setValue( " + i + "," + 0 + "," + "'" + dt.Rows[i]["year"].ToString() + "');");
                // i need this type of output " data.setValue(0, 1, 'sales');",(1, 1, 'sales');" * so on  in the first line so for this
                //m using i for the 1& 2 and so on . and after this i am writting 1 and after this sales using datatable
                str.Append("data.setValue(" + i + "," + 1 + "," + dt.Rows[i]["sales"].ToString() + ") ;");
                // i need this type of output " data.setValue(0,2, 'expences');",(1, 2, 'sales');" * so on  in the first line so for this
                //m using i for the 1& 2 and so on . and after this i am writting 2 and after this expences using datatable
                str.Append(" data.setValue(" + i + "," + 2 + "," + dt.Rows[i]["expences"].ToString() + ");");



            }
            // the other code same like as google's javascript code
                  str.Append("   var chart = new google.visualization.LineChart(document.getElementById('chart_div'));");
            // in the below line you can set width height of the chart according to your need
            str.Append(" chart.draw(data, {width: 600, height: 240, title: 'Company Performance',");
            //  str.Append(" var chart = new google.visualization.BarChart(document.getElementById('chart_div'));");
            str.Append("vAxis: {title: 'Year', titleTextStyle: {color: 'green'}}");
            str.Append("}); }");
            str.Append("</script>");
            lt.Text = str.ToString().TrimEnd(',').Replace('*', '"');


            con.Close();
        }
        catch
        {

        }
        finally
        {
            con.Close();
        }

    }
}
See output in this image:

Sql Script for database:

/****** Object:  Table [dbo].[tb_exp]    Script Date: 07/07/2011 16:40:07 ******/
IF  EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[tb_exp]') AND type in (N'U'))
DROP TABLE [dbo].[tb_exp]
GO
/****** Object:  Table [dbo].[tb_exp]    Script Date: 07/07/2011 16:40:07 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
IF NOT EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[tb_exp]') AND type in (N'U'))
BEGIN
CREATE TABLE [dbo].[tb_exp](
      [id] [bigint] IDENTITY(1,1) NOT NULL,
      [year] [varchar](50) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
      [sales] [varchar](50) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
      [expences] [varchar](50) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
 CONSTRAINT [PK_tb_exp] PRIMARY KEY CLUSTERED
(
      [id] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON)
)
END
GO
SET IDENTITY_INSERT [dbo].[tb_exp] ON
INSERT [dbo].[tb_exp] ([id], [year], [sales], [expences]) VALUES (1, N'2009', N'5000', N'2136')
INSERT [dbo].[tb_exp] ([id], [year], [sales], [expences]) VALUES (2, N'2010', N'9002', N'5063')
INSERT [dbo].[tb_exp] ([id], [year], [sales], [expences]) VALUES (3, N'2011', N'8800', N'2225')
SET IDENTITY_INSERT [dbo].[tb_exp] OFF

Conclusion
Through this article, you have learned how to create Visualization: line Chart using the google’s javascript code as well as asp.net code.

Okas  guys, enjoy the code. Meet in next article again.

Thanx



4 comments:

  1. Hi,

    We are looking for good quality line chart with labels. We have gone through your trial line chart. But when we print that sample chart, it gets pixelated. Also, we want label to be present along with line chart in such a way we can change its property dynamically. Looking forward for your response at earliest.

    Note: We are using Asp.net 4.0 and we are binding data dynamically to line chart.

    Regards,
    Silambarasan .B

    ReplyDelete
  2. Features expected in the chart

    1. Should have graph types like line,column chart.
    2. Combination of charts should be possible
    3. Animations like call outs should be available (It will be helpful if tabular format can be displayed in chart or callout)
    4. Multiple Y axis should be possible
    5. No of points on y axis should be in our control
    6. We should be allowed to set interval on Y axis
    7. Minimum and maximum values should be allowed to set by us
    8. Data should be coming from database
    9. Labels for each data point should be possible
    10. Tool tip should be available
    11. Data Points should be clickable and navigation to another graph or another page should be possible.
    12. Drill down of graphs should be possible
    13. Smart labels should be available
    14. Markers should be available.
    Regards,
    Silambarasan.B

    ReplyDelete