Introduction:
Here I will explain how to use Ajax rating control with database to display average rating for particular article using asp.net
Description:
Previously I explained how to use Ajax Collapsible panel . Now I will explain how to use Ajax rating control with Database in asp.net. In many sites we will see rating options for books, articles and movies etc by giving rating option to user we have chance to know about particular thing how much users are feeling comfort with particular thing. In Ajax we have a rating control by using that we can display the rating option easily. Here I am storing each user rating details into database and displaying the average rating based on number of users rating. To achieve this first design one table in your database and give name like RatingDetails if you want to give another name you can but you need to change table name in code also.
Here I will explain how to use Ajax rating control with database to display average rating for particular article using asp.net
Description:
Previously I explained how to use Ajax Collapsible panel . Now I will explain how to use Ajax rating control with Database in asp.net. In many sites we will see rating options for books, articles and movies etc by giving rating option to user we have chance to know about particular thing how much users are feeling comfort with particular thing. In Ajax we have a rating control by using that we can display the rating option easily. Here I am storing each user rating details into database and displaying the average rating based on number of users rating. To achieve this first design one table in your database and give name like RatingDetails if you want to give another name you can but you need to change table name in code also.
Column Name
|
Data Type
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Allow Nulls
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Id
|
Int(Set Identity=true)
|
No
|
Rate
|
int
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Yes
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After completion of design table in database add AjaxControlToolkit reference to your application after that add
<%@ Register Namespace="AjaxControlToolkit" Assembly="AjaxControlToolkit" tagPrefix="ajax" %>
To your aspx page and design your page likes this
<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="ajax" %>
<!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>Ajax Rating Sample</title>
<style type="text/css">
.ratingEmpty
{
background-image: url(ratingStarEmpty.gif);
width:18px;
height:18px;
}
.ratingFilled
{
background-image: url(ratingStarFilled.gif);
width:18px;
height:18px;
}
.ratingSaved
{
background-image: url(ratingStarSaved.gif);
width:18px;
height:18px;
}
</style>
</head>
<body>
<form id="form1" runat="server">
<ajax:ToolkitScriptManager ID="ScripManager1" runat="server"/>
<div>
<asp:UpdatePanel ID="pnlRating" runat="server">
<ContentTemplate>
<table width="35%">
<tr>
<td width="27%">
<b>Average Rating:</b>
</td>
<td>
<ajax:Rating ID="ratingControl" AutoPostBack="true" OnChanged="RatingControlChanged" runat="server"StarCssClass="ratingEmpty" WaitingStarCssClass="ratingSaved" EmptyStarCssClass="ratingEmpty"FilledStarCssClass="ratingFilled">
</ajax:Rating>
<b> <asp:label ID="lbltxt" runat="server"/> </b>
</td>
</tr>
<tr>
<td colspan="2">
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</td>
</tr>
</table>
</ContentTemplate>
</asp:UpdatePanel>
</div>
</form>
</body>
</html>
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If you observe above code I define lot of properties to ajax:Rating now I will explain all the properties of Ajax rating control
AutoPostBack – This property should be true because we are storing rating details during rating item click.
OnChanged – This event is used to get how many stars user has selected.
StarCssClass – This cssclass is used for to display starts.
WaitingStarCssClass – This cssclass is used to show the starts color during saving the rating value.
EmptyStarCssClass – This cssclass is used to display empty starts color.
FilledStarCssClass – This cssclass is used to display filled stars color.
CurrentRating – This property is used to display Initial rating value (Number of starts to be filled initially).
MaxRating – This property is used to display maximum rating value (No. of starts here I am displaying only 5 if you want to increase starts value give property like this MaxRating=10).
ReadOnly – This property is used to make rating control read only.
RatingAlign – This property is used to set starts vertical or horizontal.
RatingDirection – This property is used to set the direction of stars(LeftToRight or TopToBottom or RightToLeft or BottomToTop).
Now in code behind add following namespaces
C# Code
using System.Configuration;
using System.Data;
using System.Data.SqlClient;
|
After completion of adding namespaces in code behind add following code
SqlConnection con = newSqlConnection(ConfigurationManager.ConnectionStrings["dbconnection"].ConnectionString);
protected void Page_Load(object sender, EventArgs e)
{
if(!IsPostBack)
{
BindRatingControl();
}
}
protected void RatingControlChanged(object sender, AjaxControlToolkit.RatingEventArgs e)
{
con.Open();
SqlCommand cmd = new SqlCommand("insert into RatingDetails(Rate)values(@Rating)",con);
cmd.Parameters.AddWithValue("@Rating", ratingControl.CurrentRating);
cmd.ExecuteNonQuery();
con.Close();
BindRatingControl();
}
protected void BindRatingControl()
{
int total = 0;
DataTable dt = new DataTable();
con.Open();
SqlCommand cmd = new SqlCommand("Select Rate from RatingDetails", con);
SqlDataAdapter da = new SqlDataAdapter(cmd);
da.Fill(dt);
if(dt.Rows.Count>0)
{
for(int i=0;i<dt.Rows.Count;i++)
{
total += Convert.ToInt32(dt.Rows[i][0].ToString());
}
int average = total/(dt.Rows.Count);
ratingControl.CurrentRating = average;
lbltxt.Text = dt.Rows.Count+"user(s) have rated this article";
}
}
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VB Code
Now in web.config file set your database connection because in above code I am getting connection from web.config
Imports System.Configuration
Imports System.Data
Imports System.Data.SqlClient
Partial Class _Default
Inherits System.Web.UI.Page
Private con As NewSqlConnection(ConfigurationManager.ConnectionStrings("dbconnection").ConnectionString)
Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
If Not IsPostBack Then
BindRatingControl()
End If
End Sub
Protected Sub RatingControlChanged(ByVal sender As Object, ByVal e AsAjaxControlToolkit.RatingEventArgs)
con.Open()
Dim cmd As New SqlCommand("insert into RatingDetails(Rate)values(@Rating)", con)
cmd.Parameters.AddWithValue("@Rating", ratingControl.CurrentRating)
cmd.ExecuteNonQuery()
con.Close()
BindRatingControl()
End Sub
Protected Sub BindRatingControl()
Dim total As Integer = 0
Dim dt As New DataTable()
con.Open()
Dim cmd As New SqlCommand("Select Rate from RatingDetails", con)
Dim da As New SqlDataAdapter(cmd)
da.Fill(dt)
If dt.Rows.Count > 0 Then
For i As Integer = 0 To dt.Rows.Count - 1
total += Convert.ToInt32(dt.Rows(i)(0).ToString())
Next
Dim average As Integer = total \ (dt.Rows.Count)
ratingControl.CurrentRating = average
lbltxt.Text = dt.Rows.Count & "user(s) have rated this article"
End If
End Sub
End Class
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<connectionStrings>
<add name="dbConnection" connectionString="Data Source=SureshDasari;Initial Catalog=MySampleDB;Integrated Security=true"/>
</connectionStrings>
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Demo
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