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ASP.NET Gridview control does not fire rowcommand event inside an ajax toolkit's update panel

Posted on 2009-05-17
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Last Modified: 2012-05-07
Hi, I've been browsing google and ex from last several hours but could not find a resolution of my problem. The problem is that when i place a gridview control inside an ajax toolkit update panel, the rowcommand event is not fired. As it seems the callback event is being raised but the code inside the grid view rowcommand event handler is never reached. I've attached my code with this post, in which i've placed a gridview and a form with a text box inside an undate panel. I need to set textbox value fetching from database based upon the imagebutton click which is having command name and command argument attributes.
================== Design Source ==================
<asp:UpdatePanel ID="pnlMain" runat="server" UpdateMode="Always">
    <ContentTemplate>
        <table class="entryform" cellpadding="0" cellspacing="0" width="95%">
            <tr>
                <td class="first" style="width: 172px; height: 24px; vertical-align:top;">
                    Current Categories:</td>
                <td class="last" style="height: 24px">
                    <asp:GridView ID="gvwData" DataKeyNames="CategoryId" CssClass="grid" runat="server" Width="100%" AutoGenerateColumns="false"
                        AllowPaging="True" PagerSettings-Mode="Numeric" onpageindexchanging="gvwData_PageIndexChanging" PageSize="10" 
                        OnRowCommand="gvwData_RowCommand" OnRowCreated="gvwData_RowCreated" OnRowDeleting="gvwData_RowDeleting" OnRowEditing="gvwData_RowEditing">
                        <EmptyDataTemplate>
                            <span style="color:White;">No Category Found.</span>
                        </EmptyDataTemplate>
                        <EmptyDataRowStyle CssClass="emptyrow" />            
                        <RowStyle CssClass="row" />
                        <AlternatingRowStyle CssClass="altrow" />
                        <Columns>
                            <asp:BoundField DataField="CategoryId" ReadOnly="True" HeaderText="ID" Visible="False" />
                            <asp:BoundField DataField="Name" ReadOnly="True" HeaderText="Name" />
                            <asp:TemplateField>
                                <ItemTemplate>
                                    <asp:ImageButton ID="btnDetails" CausesValidation="false" runat="server" ImageUrl="~/assets/images/admin/edit.gif"
                                        CommandArgument='<%# Eval("CategoryId")  %>' CommandName="Details" ToolTip="View / Edit" />
                                    <asp:ImageButton ID="btnDelete" CausesValidation="false" runat="server" ImageUrl="~/assets/images/admin/del.gif"
                                        CommandArgument='<%# Eval("CategoryId")  %>' CommandName="Delete" ToolTip="Delete"
                                        OnClientClick="return confirm('Do You Really Want To Delete This Category?')"/>                    
                                </ItemTemplate>
                                <ItemStyle Width="50px" HorizontalAlign="Center" />
                            </asp:TemplateField>
                        </Columns>
                        <PagerStyle CssClass="pager"/>
                    </asp:GridView>
                </td>
            </tr>
            <tr>
            <td class="first">
                    Name:</td>
            <td class="last">
                    <asp:TextBox ID="txtName" runat="server" Width="300px" MaxLength="255"></asp:TextBox>
            </td>
            </tr>
            <tr class="fullrow">
	<td colspan="2"></td>
            </tr>
            <tr class="bg">
	<td class="first"></td>
	<td class="last">
	<asp:Button ID="btnSave" runat="server" onclick="btnSave_Click" Text="Save" 
                        Width="60px" />
                    <asp:Button ID="btnCancel" runat="server" CausesValidation="False" onclick="btnCancel_Click" 
                        Text="Cancel" Width="60px" />
	            </td>
            </tr>
        </table>
    </ContentTemplate>
</asp:UpdatePanel>
 
================== Code Behind ==================
protected void BindData()
        {
            gvwData.DataSource = datasource; // datasource is a dataset fetched from database
            gvwData.DataBind();
        }
 
        protected void SetEditable(int cid)
        {
            Category cat = new Category();
            if (cat.IsLoaded)
            {
                txtName.Text = cat.Name;
                btnSave.Text = "Update";
            }       }
 
        protected void gvwData_RowCommand(object sender, GridViewCommandEventArgs e)
        {
            if (e.CommandName == "Details")
            {
                SetEditable(int.Parse(e.CommandArgument.ToString()));
            }
            else if (e.CommandName == "Delete")
            {
                Category cat = new Category(int.Parse(e.CommandArgument.ToString()));
                if (cat.IsLoaded)
                {
                    cat.IsDeleted = true;
                    cat.Save(Context.User.Identity.Name);
 
                    BindData();
                }
            }
        }

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Question by:23-degrees
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LVL 12

Accepted Solution

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techExtreme earned 250 total points
ID: 24406220
Hi,
Please verify following CheckList:

1) You have not posted your page load event handler. Please check it that when you are binding the grid for the first time, you are doint it inside the 'Not' postback , i.e. if page is not postback -> bind the grid.  Check it out.

2) Is your row command event fired if you remove ajax and allow full page postback?

I guess we'll be able to find the solution once these checks are made.
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LVL 12

Expert Comment

by:techExtreme
ID: 24406227
err I forgot to mention the 3rd step,

3) Ensure there are no exceptions while grid is bound, to check it , put a try catch around inside when you call grid's .databind() event. There should ideally no exceptions when grid is bound, else we'll have problems with other events through the page lifecycle.
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