Wednesday, 16 January 2013

Jquery read DatakeyNames value of Selected Rows of GridView in Asp.Net

As we know GridView is a very popular control. We always experiment to enhance the GridView control to provide better experience to user. Since javascript is also a popular clientside language, most of the times we use this in client side operations like validation, Row coloring, cell coloring etc. Now a days Jquery is more popular so that in this article i will explain how you can capture the selected rows of a GridView control and also read the datakeyname values using JQuery. So at first i will tell you how we capture selected rows of a GridView. In this example i don't consider the built in Select command. Instead of select command here i use checkbox to select rows by user. The another important tip is we cannot directly access DataKeyNames values of a GridView. To get the value, here I will use a template column to store the same DataKeyValue in a hiddenfield. After that through iteration by Jquery I will read the hiddenfield values which looks alike datakeynames values.

For selecting/deselecting all checkboxes of a GridView using Javascript click here.


My example output look like below:
GridView_Datakeynames_jQuery

The GridView Control HTML will be:
01<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false" DataKeyNames="ID">  
02            <Columns>  
03                <asp:TemplateField>  
04                    <ItemTemplate>  
05                        <asp:CheckBox ID="chkSelect" runat="server" />  
06                        <asp:HiddenField ID="IDVal" runat="server" Value='<%# Eval("ID") %>' />  
07                    </ItemTemplate>  
08                </asp:TemplateField>  
09                <asp:TemplateField>  
10                    <HeaderTemplate>  
11                        Name  
12                    </HeaderTemplate>  
13                    <ItemTemplate>  
14                        <asp:Label ID="Label1" runat="server" Text='<%# Eval("Name") %>'></asp:Label>  
15                    </ItemTemplate>  
16                </asp:TemplateField>  
17            </Columns>  
18        </asp:GridView>

The Jquery Script also given below:
01<script type="text/javascript">  
02    $(document).ready(function() { 
03    var gridView1Control = document.getElementById('<%= GridView1.ClientID %>');  
04    $('#<%= cmdGetData.ClientID %>').click(function (e) {
05        var DataKeyName=""
06        $('input:checkbox[id$=chkSelect]:checked', gridView1Control).each(function (item, index) {  
07            if(DataKeyName.length==0)
08            {
09                DataKeyName = $(this).next('input:hidden[id$=IDVal]').val();
10            }
11            else
12            {
13                DataKeyName += "," + $(this).next('input:hidden[id$=IDVal]').val();
14            }
15        });  
16        alert(DataKeyName);
17        return false;  
18    });  
19   });  
20</script>

Now Bind the GridView data within Page_Load Event:
01protected void Page_Load(object sender, EventArgs e)
02    {
03        DataTable dt = new DataTable();
04 
05        dt.Columns.Add("ID");
06        dt.Columns.Add("Name");
07 
08        DataRow oItem = dt.NewRow();
09        oItem[0] = "1";
10        oItem[1] = "Shawpnendu Bikash Maloroy";
11        dt.Rows.Add(oItem);
12 
13        oItem = dt.NewRow();
14        oItem[0] = "2";
15        oItem[1] = "Bimalendu Bikash Maloroy";
16        dt.Rows.Add(oItem);
17 
18        oItem = dt.NewRow();
19        oItem[0] = "3";
20        oItem[1] = "Purnendu Bikash Maloroy";
21        dt.Rows.Add(oItem);
22 
23        GridView1.DataSource = dt;
24        GridView1.DataBind();
25 
26    }

The complete markup language of this example is:
01<%@ Page Language="C#" AutoEventWireup="true" CodeFile="GridView_DataKeyNames_Jquery.aspx.cs" Inherits="GridView_DataKeyNames_Jquery" %>
02 
03<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
04 
05<html xmlns="http://www.w3.org/1999/xhtml" >
06<head runat="server">
07<title>Get Selected rows of a GridView using Jquery</title>
08<script src="Script/jquery.js" type="text/javascript"></script>
09 
10<script type="text/javascript">  
11    $(document).ready(function() { 
12    var gridView1Control = document.getElementById('<%= GridView1.ClientID %>');  
13    $('#<%= cmdGetData.ClientID %>').click(function (e) {
14        var DataKeyName=""; 
15        $('input:checkbox[id$=chkSelect]:checked', gridView1Control).each(function (item, index) {  
16            if(DataKeyName.length==0)
17            {
18                DataKeyName = $(this).next('input:hidden[id$=IDVal]').val();
19            }
20            else
21            {
22                DataKeyName += "," + $(this).next('input:hidden[id$=IDVal]').val();
23            }
24        });  
25        alert(DataKeyName);
26        return false;  
27    });  
28   });  
29</script>  
30     
31</head>
32<body>
33    <form id="form1" runat="server">
34    <div>
35        <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false" DataKeyNames="ID">  
36            <Columns>  
37                <asp:TemplateField>  
38                    <ItemTemplate>  
39                        <asp:CheckBox ID="chkSelect" runat="server" />  
40                        <asp:HiddenField ID="IDVal" runat="server" Value='<%# Eval("ID") %>' />  
41                    </ItemTemplate>  
42                </asp:TemplateField>  
43                <asp:TemplateField>  
44                    <HeaderTemplate>  
45                        Name  
46                    </HeaderTemplate>  
47                    <ItemTemplate>  
48                        <asp:Label ID="Label1" runat="server" Text='<%# Eval("Name") %>'></asp:Label>  
49                    </ItemTemplate>  
50                </asp:TemplateField>  
51            </Columns>  
52        </asp:GridView>  
53   
54         
55    
56        <asp:Button ID="cmdGetData" runat="server" Text="Get Data" />   
57    </div>
58    </form>
59</body>
60</html>

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