Set the hidden field value in Jquery and accessing from the codebehind in c#.net

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Hi Developers,
In my Web application

I am setting the Hidden Field value in Jquery function.
And I am trying to access the hidden field value in code behind in c#.

But I am not getting the Hidden field value.

Please check the below code for my aspx page:

HTML

<html xmlns="http://www.w3.org/1999/xhtml">
<head  runat="server">
    <title></title>
    <link href="Styles/StyleSheet1.css" rel="stylesheet" type="text/css" />
    <script type="text/javascript" src="Styles/html2canvas.js"></script>
    <script type="text/javascript">
       
        function warningMessage() {
            var canvas1 = document.getElementById("myCanvas");
            html2canvas(document.getElementById("grvMergeHeader"), {


                onrendered: function (canvas1) {
                    //document.body.appendChild(canvas1);

                    var image = canvas1.toDataURL("image/png");
                    image = image.replace('data:image/png;base64,', '');
                    document.getElementById("hdnResultValue").value = image;
                }
            });
        }
    </script>
</head>
<body>
    <form id="form1"  runat="server">
    <div>
    <canvas id="myCanvas"  runat="server" width="200" height="200" hidden="hidden"></canvas>
    <asp:HiddenField ID="hdnResultValue" Value="Hie." runat="server" ClientIDMode="Static"/>
        <asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Export To PPT" Visible="False" />
      
           
        <asp:Button ID="Button2" runat="server" onclick="Button2_Click" Text="Button" OnClientClick="warningMessage();"/>
           
    <asp:GridView ID="grvMergeHeader" runat="server" CssClass="HeaderStyle" 
                            OnRowCreated="grvMergeHeader_RowCreated1"
                            OnRowDataBound="grvMergeHeader_RowDataBound" AllowSorting="True"
                            PageSize="25" AutoGenerateColumns="false" 
            ForeColor="White" Font-Names="Arial" Font-Size="10pt" GridLines="None">
                            <HeaderStyle Font-Bold="False" BorderWidth="0" />
                            <AlternatingRowStyle BackColor="White"  Font-Bold="false"   />
                          <Columns>
                                <asp:BoundField DataField="State" HeaderText="State"  ItemStyle-Width="5%" ItemStyle-HorizontalAlign="Left" ItemStyle-Height="3px" HeaderStyle-CssClass="ff1" />                                
                                <asp:BoundField DataField="LOB" HeaderText="LOB"  ItemStyle-Width="15%" ItemStyle-HorizontalAlign="Left" ItemStyle-Height="3px" HeaderStyle-CssClass="ff2" />
                                <asp:BoundField DataField="DPW" HeaderText="2012 DPW"  ItemStyle-Width="8%"  ItemStyle-HorizontalAlign="Right" ItemStyle-Height="3px" DataFormatString="{0:0.00}" />
                                <asp:BoundField DataField="10Y_PremiumGrowth" HeaderText="Premium growth"  ItemStyle-Width="8%"   ItemStyle-HorizontalAlign="Right" ItemStyle-Height="3px" DataFormatString="{0:0.00}" HeaderStyle-HorizontalAlign="Center" HeaderStyle-VerticalAlign="Bottom" HeaderStyle-CssClass="Prem_growth" />
                                <asp:BoundField DataField="10Y_OutperformUnderperform" HeaderText="Loss&LAE Incurred Out(Under) performance "  ItemStyle-Width="8%"  ItemStyle-HorizontalAlign="Right" ItemStyle-Height="3px"  HeaderStyle-CssClass="LossLAE10" />
                                <asp:BoundField DataField="5Y_PremiumGrowth" HeaderText=" premium growth " ItemStyle-Width="8%"  ItemStyle-HorizontalAlign="Right"  ItemStyle-Height="3px" HeaderStyle-HorizontalAlign="Center" HeaderStyle-VerticalAlign="Bottom" HeaderStyle-CssClass="Prem_growth"  />
                                <asp:BoundField DataField="5Y_OutperformUnderperform" HeaderText=" Loss&LAE Incurred Out(Under) performance" ItemStyle-Width="8%"  ItemStyle-HorizontalAlign="Right" ItemStyle-Height="3px" HeaderStyle-HorizontalAlign="Center" HeaderStyle-VerticalAlign="Bottom" HeaderStyle-CssClass="LossLAE5"/>
                                <asp:BoundField DataField="3Y_PremiumGrowth" HeaderText="premium growth " ItemStyle-Width="8%"  ItemStyle-HorizontalAlign="Right"  ItemStyle-Height="3px" HeaderStyle-HorizontalAlign="Center" HeaderStyle-VerticalAlign="Bottom" HeaderStyle-CssClass="Prem_growth" />
                                <asp:BoundField DataField="3Y_OutperformUnderperform" HeaderText="Loss&LAE Incurred Out(Under) performance" ItemStyle-Width="8%"  ItemStyle-HorizontalAlign="Right"  ItemStyle-Height="3px" HeaderStyle-HorizontalAlign="Center" HeaderStyle-VerticalAlign="Bottom" HeaderStyle-CssClass="LossLAE3"/>
                                <asp:BoundField DataField="10Y_LossLAERatio" HeaderText="10years" ItemStyle-Width="8%"  ItemStyle-HorizontalAlign="Right" ItemStyle-Height="3px" HeaderStyle-HorizontalAlign="Center" HeaderStyle-VerticalAlign="Bottom" HeaderStyle-CssClass="yrs1035" />                             
                                <asp:BoundField DataField="5Y_LossLAERatio" HeaderText="5 years " ItemStyle-Width="8%"  ItemStyle-HorizontalAlign="Right" ItemStyle-Height="3px"  HeaderStyle-HorizontalAlign="Center" HeaderStyle-VerticalAlign="Bottom" HeaderStyle-CssClass="yrs1035"/>
                                <asp:BoundField DataField="3Y_LossLAERatio" HeaderText="3 years " ItemStyle-Width="8%"   ItemStyle-HorizontalAlign="Right" ItemStyle-Height="3px" HeaderStyle-HorizontalAlign="Center" HeaderStyle-VerticalAlign="Bottom" HeaderStyle-CssClass="yrs1035"/>
                            </Columns>
                            <RowStyle BackColor="#c9c9c7"  Font-Size="10pt" Font-Names="Arial" ForeColor="Black" />
                        </asp:GridView>
                       
    </div>
        </form>
</body>
</html>

And My Code behind code:

C#

protected void Page_Load(object sender, EventArgs e)
        {
           
            if (!IsPostBack)
            {
                GetData();
            }
          
        }
public void GetData()
        {

            string lobgrouplist = "";
            try
            {
               
                if (Session["table"] == null)
                {
                    lobgrouplist = "";
                }
                else
                {
                    lobgrouplist = Convert.ToString(Session["table"]);
                   
                }

                string snlcompanyname = "Stonebridge Casualty Ins Co.";
                string reporttypeflag = "S";
                string snlstatelob = "All States";
                string foryears = "";
                string forperformance = "";


                DataTable dataTable = new DataTable();

                SqlConnection connection = new SqlConnection(ConfigurationManager.ConnectionStrings["LOUPe_Inventory_WorkingConnectionString"].ConnectionString);
                SqlCommand cmd = new SqlCommand("procWebLossRatioAnalysis_G_RP_LR", connection);
                SqlDataAdapter sqlDataAdapter = new SqlDataAdapter(cmd);
                cmd.CommandType = CommandType.StoredProcedure;
                cmd.Parameters.AddWithValue("@pSNLCompanyName", snlcompanyname);
                cmd.Parameters.AddWithValue("@pReportTypeFlag", reporttypeflag);
                cmd.Parameters.AddWithValue("@pSNLStateLOB", snlstatelob);
                cmd.Parameters.AddWithValue("@pForYears", foryears);
                cmd.Parameters.AddWithValue("@pPerformance", forperformance);
                cmd.Parameters.AddWithValue("@pLOBGrpList", lobgrouplist);
                sqlDataAdapter.Fill(dataTable);
                grvMergeHeader.DataSource = dataTable;
                grvMergeHeader.DataBind();

            }
            catch
            {
                throw;
            }
            finally
            {
                conn.Close();
            }
        }
protected void Button2_Click(object sender, EventArgs e)
        {
            Button1.Visible = true;
          
            //Page.ClientScript.RegisterStartupScript(this.GetType(), "jh", "warningMessage();", true);

            string codeBehindValue= hdnResultValue.Value;
            
            grvMergeHeader.Visible = false;
        }

Please tell me what might be the problem and kindly provide me the solution

Posted 16-Oct-13 20:45pm

D-Kishore

Updated 20-Oct-13 16:48pm

v5

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Khandwawala Hatim · Answer 1 · 2013-10-16T21:19:00

Solution 1

This is due to the underhanded post back, Try to place an update panel and try.
If it still wont work then reply to this. I have an alternate solution for that.

Posted 16-Oct-13 21:19pm

Khandwawala Hatim

Comments

D-Kishore 17-Oct-13 5:58am

you mean that I need to keep hidden field in UpdatePanel.

D-Kishore 17-Oct-13 6:14am

Hi Hatim,

I used UpdatePanel, No success, kindly provide other way what you have.