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Find Control - RadGrid edit template text box

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Grid

This is a migrated thread and some comments may be shown as answers.

Ben asked on 23 Nov 2010, 05:38 PM

Hi Guys,
Getting an error when I try to get control of radgrid edit template text box in code behind. I want to make edit template textbox "visible = false" when insert click(Add new record). Anybody can help me?

protected void ItemCommand(object sender, GridCommandEventArgs e)
        {
            if (e.CommandName == RadGrid.InitInsertCommandName)
            {
                (this.Page.FindControl("txtOpcode") as RadTextBox).Visible = false;
                //(RadGrid1.MasterTableView.FindControl("txtOpcode") as RadTextBox).Visible = false;
            }

Error: Sys.WebForms.PageRequestManagerServerErrorException: Object reference not set to an instance of an object.

7 Answers, 1 is accepted

answered on 24 Nov 2010, 06:04 AM

Hello Ben,
You can find the TextBox in ItemDataBound Event.Try the following code snippet.

C#:

protected void RadGrid1_ItemDataBound(object sender, Telerik.Web.UI.GridItemEventArgs e)

{

if (e.Item is GridEditFormInsertItem && e.Item.OwnerTableView.IsItemInserted)

{

GridEditFormInsertItem item = (GridEditFormInsertItem)e.Item;

TextBox txt = (TextBox)item.FindControl("TextBox1");

txt.Visible = false;

}

Please go through the following documentation for more information .
http://www.telerik.com/help/aspnet-ajax/grddistinguisheditinsertmodeonitemcreateditemdatabound.html

Thanks,
Princy.

answered on 28 Feb 2011, 05:52 PM

Hi,

I'm receiving the exact same error that Ben received (Sys.WebForms.PageRequestManagerServerErrorException: Object reference not set to an instance of an object.) but my situation is slightly different.

I have a custom edit form, and within the edit form I have RadAsyncUpload and RadBinaryImage conrols. Where I'm receiving the error is when I try to upload a new image. When I debug, the line of code that's creating the error is where I'm trying to find the RadBinaryImage control in my edit form. See code below:

RadGrid:

<telerik:RadGrid ID="RadGrid1" runat="server" GridLines="None" AllowPaging="True" AllowFilteringByColumn="true"

CssClass="RadGrid" AllowSorting="True" AutoGenerateColumns="False" ShowStatusBar="true"

OnNeedDataSource="RadGrid1_NeedDataSource" Skin="Office2007">

<MasterTableView Width="100%" DataKeyNames="AssetID" EditMode="PopUp">

<Columns>

<telerik:GridEditCommandColumn UniqueName="EditCommandColumn">

</telerik:GridEditCommandColumn>

<telerik:GridBoundColumn UniqueName="AssetID" HeaderText="Asset ID" DataField="AssetID" ShowFilterIcon="true">

<HeaderStyle Width="60px"></HeaderStyle>

</telerik:GridBoundColumn>

<telerik:GridBoundColumn UniqueName="AssetCode" HeaderText="Asset Code" DataField="AssetCode" ShowFilterIcon="true">

<HeaderStyle Width="80px"></HeaderStyle>

</telerik:GridBoundColumn>

<telerik:GridBoundColumn UniqueName="AssetName" HeaderText="AssetName" DataField="AssetName" ShowFilterIcon="true" FilterControlWidth="200">

</telerik:GridBoundColumn>

<telerik:GridBoundColumn UniqueName="AssetDescription" HeaderText="Asset Description" DataField="AssetDescription" ShowFilterIcon="true" FilterControlWidth="250">

<HeaderStyle Width="350px"></HeaderStyle>

</telerik:GridBoundColumn>

</Columns>

<EditFormSettings CaptionFormatString="Editing Asset: {0}" CaptionDataField="AssetName"

PopUpSettings-Modal="true" EditFormType="Template">

<PopUpSettings Width="850" />

<FormTemplate>

<table width="800">

<tr>

<td>

<table cellspacing="10">

<tr>

<td>

<asp:Label ID="lblAssetID" runat="server">Asset ID:</asp:Label><br />

<asp:TextBox ID="txtAssetID" runat="server" Enabled="false" BackColor="AntiqueWhite"

CssClass="txt" Text='<%# Eval("AssetID") %>' />

</td>

</tr>

<tr>

<td>

<asp:Label ID="lblAssetCode" runat="server">Asset Code:</asp:Label><br />

<asp:TextBox ID="txtAssetCode" runat="server" Enabled="false" BackColor="AntiqueWhite"

CssClass="txt" Text='<%# Eval("AssetCode") %>' />

</td>

</tr>

<tr>

<td>

<asp:Label ID="lblAssetName" runat="server">Asset Name:<span class="ErrorMessage"> *</asp:Label><br />

<asp:TextBox ID="txtAssetName" runat="server" CssClass="txt" Text='<%# Eval("AssetName") %>' />

</td>

</tr>

<tr>

<td>

<asp:Label ID="lblAssetDescription" runat="server">Asset Description:<span class="ErrorMessage"> *</asp:Label><br />

<asp:TextBox ID="txtAssetDescription" runat="server" TextMode="MultiLine" Rows="2"

CssClass="txt" Text='<%# Eval("AssetDescription") %>' />

</td>

</tr>

<tr>

<td>

<asp:Label ID="lblAssetType" runat="server">Asset Type:<span class="ErrorMessage"> *</asp:Label><br />

<asp:DropDownList ID="ddlAssetType" runat="server" CssClass="txt" AppendDataBoundItems="true"

DataSource="<%# GetAssetTypes() %>" DataValueField="AssetTypeID" DataTextField="AssetTypeName"

SelectedValue='<%# Eval("AssetTypeID") %>'>

<asp:ListItem Value="0" Text="--- Select an Asset Type ---" />

</asp:DropDownList>

</td>

</tr>

<tr>

<td>

<asp:Label ID="lblPhysicalAssetType" runat="server">Physical Asset Type:<span class="ErrorMessage"> *</asp:Label><br />

<asp:DropDownList ID="ddlPhysicalAssetType" runat="server" CssClass="txt" AppendDataBoundItems="true"

DataSource="<%# GetPhysicalAssetTypes() %>" DataValueField="PhysicalAssetTypeID"

DataTextField="PhysicalAssetTypeName" SelectedValue='<%# (Eval("PhysicalAssetTypeID") == DBNull.Value) ? "0" : Eval("PhysicalAssetTypeID") %>'>

<asp:ListItem Value="0" Text="--- Select a Physical Asset Type ---" />

</asp:DropDownList>

</td>

</tr>

<tr>

<td>

<asp:Label ID="lblNextStep" runat="server">Next Step:<span class="ErrorMessage"> *</asp:Label><br />

<asp:DropDownList ID="ddlNextStep" runat="server" CssClass="txt" AppendDataBoundItems="true"

DataSource="<%# GetNextSteps() %>" DataValueField="NextStepID" DataTextField="NextStepName"

SelectedValue='<%# (Eval("NextStepID") == DBNull.Value) ? "0" : Eval("NextStepID") %>'>

<asp:ListItem Value="0" Text="--- Select The Next Step ---" />

</asp:DropDownList>

</td>

</tr>

<tr>

<td>

<asp:Label ID="lblCategory" runat="server">Category:<span class="ErrorMessage"> *</asp:Label><br />

<asp:RadioButtonList ID="rblCategory" runat="server" RepeatColumns="3" RepeatDirection="Vertical"

DataSource="<%# GetCategories() %>" DataValueField="CategoryID" DataTextField="CategoryName"

SelectedValue='<%# (Eval("CategoryID") == DBNull.Value) ? "0" : Eval("CategoryID") %>'>

</asp:RadioButtonList>

</td>

</tr>

<tr>

<td>

<asp:Label ID="lblTatic" runat="server">Tatic:<span class="ErrorMessage"> *</asp:Label><br />

<asp:RadioButtonList ID="rblTatic" runat="server" RepeatColumns="4" RepeatDirection="Horizontal"

DataSource="<%# GetTatics() %>" DataValueField="TaticID" DataTextField="TaticName"

SelectedIndex='<%# CheckIfValueExists(Eval("TaticID")) %>'>

</asp:RadioButtonList>

</td>

</tr>

<tr>

<td>

<asp:Label ID="lblFunctionalPreviewType" runat="server">Functional Preview Type:<span class="ErrorMessage"> *</asp:Label><br />

<asp:RadioButtonList ID="rblFunctionalPreviewType" runat="server" RepeatColumns="4"

RepeatDirection="Horizontal" DataSource="<%# GetFunctionPreviewTypes() %>" DataValueField="FunctionPreviewTypeID"

DataTextField="FunctionPreviewTypeName" SelectedValue='<%# (Eval("FunctionPreviewTypeID") == DBNull.Value) ? "0" : Eval("FunctionPreviewTypeID") %>'>

</asp:RadioButtonList>

</td>

</tr>

<tr>

<td>

<asp:Label ID="lblProgramType" runat="server">Program Type:<span class="ErrorMessage"> *</asp:Label><br />

<asp:CheckBoxList ID="cblProgramType" runat="server" RepeatColumns="3" RepeatDirection="Vertical"

DataSource="<%# GetProgramTypes() %>" DataValueField="ProgramTypeID" DataTextField="ProgramTypeName">

</asp:CheckBoxList>

</td>

</tr>

<tr>

<td>

<br />

<asp:Button ID="btnUpdate" Text="Update" runat="server" CssClass="workflowbutton2"

CommandName="Update"></asp:Button>

<asp:Button ID="btnCancel" Text="Cancel" runat="server" CssClass="workflowbutton2"

CausesValidation="False" CommandName="Cancel"></asp:Button>

</td>

</tr>

</table>

</td>

<td valign="top">

<table>

<tr>

<td>

</td>

</tr>

<tr>

<td>

<%--<asp:Image ID="Image1" runat="server" ImageUrl='<%# Eval("LargePreviewImage") %>' />--%>

<telerik:RadBinaryImage runat="server" ResizeMode="None" ID="Thumbnail" ImageUrl='<%# Eval("LargePreviewImage") %>'

AlternateText="Thumbnail" CssClass="binary-image" /><br />

<br />

<span class="invalid">

<telerik:RadAsyncUpload runat="server" ID="AsyncUpload1" MaxFileInputsCount="1" OnClientFileUploaded="fileUploaded"

OnFileUploaded="AsyncUpload1_FileUploaded" AllowedFileExtensions="jpeg,jpg,gif,png,bmp"

OnClientValidationFailed="validationFailed">

<Localization Select="Choose New Image" />

</telerik:RadAsyncUpload>

</td>

</tr>

</table>

</td>

</tr>

</table>

</FormTemplate>

</EditFormSettings>

</MasterTableView>

<ClientSettings>

<ClientEvents OnRowDblClick="RowDblClick" />

</ClientSettings>

</telerik:RadGrid>

File Upload Method (bold = where error is thrown):

protected void AsyncUpload1_FileUploaded(object sender, FileUploadedEventArgs e)

{

//Thumbnail.Width = Unit.Pixel(200);

//Thumbnail.Height = Unit.Pixel(150);

using (Stream stream = e.File.InputStream)

{

byte[] imageData = new byte[stream.Length];

stream.Read(imageData, 0, (int)stream.Length);

GridEditFormInsertItem

RadBinaryImage thumb = (RadBinaryImage)RadGrid1.MasterTableView.FindControl("Thumbnail");

thumb.DataValue = imageData;

}

My RadGrid is contained in a Master Page. How can I get at my "Thumbnail" control?

Thanks,
Mark

answered on 01 Mar 2011, 06:07 AM

Hello Mark,

You can try the following code snippet to access the RadBinaryImage in edit form.

C#:

protected void AsyncUpload1_FileUploaded(object sender, FileUploadedEventArgs e)

{

. . . . . .

RadAsyncUpload upload = (RadAsyncUpload)sender;

GridEditFormItem editItem = (GridEditFormItem)upload.NamingContainer;

RadBinaryImage thumb = (RadBinaryImage)editItem.FindControl("Thumbnail");

. . . . . .

}

Thanks,
Princy.

answered on 09 May 2011, 07:06 AM

Hi All,

I'm using Telerik Grid and binded an XML through dataset. I've a autyo generate edit coulmn.

When I press edit, I get a text box with exisitng value and update, cancel button. After typing new value whren i press am not getting the new value in the grid. Can any one help on this. I'm using updatecommand event,but no use so far. Here is my code

Hashtable newValues = new Hashtable();
            ((GridEditableItem)e.Item).ExtractValues(newValues);

            GridEditableItem editItem = (GridEditableItem)e.Item;
            GridEditableItem editedItem = e.Item as GridEditableItem;
            GridEditManager editMan = editedItem.EditManager;

            var obj = editItem.GetDataKeyValue("ConnectionString");

            //TextBox txt = e.Item.FindControl("txtValue") as TextBox;
            //if (txt != null)
            //{
            //    string s = txt.Text;
            //}
            ds.Tables["add"].Rows[editItem.DataSetIndex][1] = "XXXXX";
            //radDisplay.DataSource = ds.Tables["add"];
            radDisplay.Rebind();
            StringWriter sw = new StringWriter();
            ds.WriteXml(sw);
            Session["decryptesXMLString"] = sw.ToString();

answered on 09 May 2011, 07:53 AM

Hello Suderson,

I have tried the same and that worked as expected. One suggestion is to try the following approach to achieve the same.
C#:

protected void RadGrid1_UpdateCommand(object sender, GridCommandEventArgs e)

{

if ((e.Item is GridEditFormItem) && (e.Item.IsInEditMode))//editmode=EditForm/InPlace

{

GridEditFormItem edititem = (GridEditFormItem)e.Item;

TextBox txtbx = (TextBox)edititem.FindControl("txtValue");

string City= txtbx.Text;

}

Thanks,
Shinu.