How to get checkbox value from gridview when checkbox OnCheckedChanged

Question

I want to update data when I checked in gridview. Before I shoude get value from checkbox but my code return data from database only. I want current value after I checked.

CodeBehind:-

protected void chkSelected_CheckedChanged(object sender, EventArgs e)
{
    for (int rowIndex = 0; rowIndex < GridView1.Rows.Count; rowIndex++)
    {
        if (Convert.ToString(GridView1.Rows[rowIndex].Cells[4].Text) != "")
        {
            Response.Write("true");
        }
        else
        {
            Response.Write("fasle");
        }
    }
}

Design Code:-

<asp:GridView ID="GridView1" runat="server" DataSourceID="SqlDataSource1"
              CellPadding="4" GridLines="None" ForeColor="#333333" Font-Size="Smaller" 
              AutoGenerateColumns="False">
    <RowStyle BackColor="#EFF3FB" />
    <Columns>
        <asp:BoundField DataField="LevelID" HeaderText="ลำดับข้อ" ReadOnly="True" 
                        ItemStyle-Width="50"  >
        </asp:BoundField>
        <asp:BoundField DataField="LevelDesc" HeaderText="คำถาม" ReadOnly="True" 
                        ItemStyle-Width="250"  >
        </asp:BoundField>
        <asp:BoundField DataField="ChoiceID" HeaderText="ข้อย่อย" ReadOnly="True" 
                        ItemStyle-Width="50"  >
        </asp:BoundField>
        <asp:BoundField DataField="ChoiceDesc" HeaderText="คำถามย่อย" ReadOnly="True" 
                        ItemStyle-Width="400"  >
        </asp:BoundField>
        <asp:TemplateField HeaderText="ใช่">          
            <ItemTemplate>              
                <asp:CheckBox ID="chkSelected" runat="server" Checked='<%# Eval("Selected").ToString().Equals("True") %>'
                     AutoPostBack="true" OnCheckedChanged="chkSelected_CheckedChanged" CssClass="chkBox" />          
            </ItemTemplate>       
        </asp:TemplateField> 
    </Columns>
    <FooterStyle BackColor="#507CD1" ForeColor="White" Font-Bold="True" />
    <PagerStyle BackColor="#2461BF" ForeColor="White" HorizontalAlign="Center" />
    <SelectedRowStyle BackColor="#D1DDF1" Font-Bold="True" ForeColor="#333333" />
    <HeaderStyle BackColor="#0000CD" Font-Bold="True" ForeColor="White" />
    <EditRowStyle BackColor="#2461BF" />
    <AlternatingRowStyle BackColor="White" />
</asp:GridView>

ErikusMaximus · Accepted Answer · 2019-05-22 14:43:56Z

3

use GridViewRow as follow...You can get the current row of the checkbox which is checked using NamingContainer property as follow...

Edit:- Change the markup and add Hiddenfield to hold value for Selected as follow...

<asp:TemplateField HeaderText="ใช่">          
            <ItemTemplate>              
                <asp:CheckBox ID="chkSelected" runat="server"  Checked='<%# Eval("Selected").ToString().Equals("True") %>'
                     AutoPostBack="true" OnCheckedChanged="chkSelected_CheckedChanged" CssClass="chkBox" />     
                <asp:HiddenField ID="hiddenField1" Value='<%# Eval("Selected").ToString() %>' runat="server" />    
            </ItemTemplate>       
 </asp:TemplateField>

Then you can get the Hiddenfield as follow and it's value as well

protected void chkSelected_CheckedChanged(object sender, EventArgs e)
    {
         GridViewRow row = (GridViewRow)(((CheckBox)sender).NamingContainer);
         HiddenField hdnCheck=(HiddenField)row.Cells[4].FindControl("hiddenField1");
         if (Convert.ToString(hdnCheck.Value != "")
           {
               Response.Write("true");
           }
           else
           {
               Response.Write("false");
           }

         // Edit: You can easily get Checkbox which has been checked, and do your logic
         CheckBox chkSelect=(CheckBox)sender;
         if (chkSelect.Checked)
           {
               Response.Write("true");
           }
           else
           {
               Response.Write("false");
           }    
    }

edited May 22, 2019 at 14:43

ErikusMaximus

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answered Oct 26, 2012 at 6:09

Amol Kolekar

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6 Comments

SueSaya Over a year ago

Your code it's work! but if data in database is 'True' when I checked it's return 'false' and if data in database is 'Null' when I checked it's return 'false' too.

Amol Kolekar Over a year ago

by looking at your code you have bound the "Selected" value to checkbox,which will be shown when gridview is rendered...on click of that checkbox what exactly you want to achieve?

SueSaya Over a year ago

I want current status of checkbox. If data in database is true when I checked on checkbox it's return value to false.

SueSaya Over a year ago

I try it but it return data in database only when I checked on checkbox. If data in database is false when I checked it return false allway and data in database is true when I checked it retrun true allway too.

Amol Kolekar Over a year ago

you want when checkbox is checked it should return true and vice versa regardless of what value is there in database?

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