Forms Data Controls :: GridView And Html Select - Find The GV Object (getElementByID("GridView1") Returns Null)?
Jul 10, 2010
I have a webpage with a select object and a GridView object. For testing my problem i've created asp button and html button.On pageLoad the GV is empty and select is being filled with names. (GV is not appearing)After choosing a name from the select options, the user should click a button and then the GV need to be filled with relevant info.I am having 2 "related" problems:
1. When clicking on the asp button and getting into the click function on the aspx.cs file, i can't find the select object and retrieve the selected option. How can i get this?
2. When clicking on the html button and getting into the button_click function on the aspx file (javascript), i can't find the GV object (getElementByID("GridView1") returns null). I guess that it's because the GV is not loaded initialy since it's empty.I've tried also using callback methods, but the although it seems like i am reaching the GV and performing DataBind(), the GV table won't show on the page.
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Nov 29, 2013
I have detailsview control with bound fields...some using Templatefields. I am trying to access values in those fields but i get nulls....i really dont know why..I am proving all my code....
<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Projects.aspx.vb" Inherits="Projects" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title>Projects Statuses</title>
[code]....
I guess something might be getting messy with the mode changing event... a postback? But if i remove the databinding code, i get an error! why find control returns null??
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Apr 2, 2010
I am using some AJAX and some JQuery for Login panel animation in Master page.Also in my home page I am using AJAX Tab container.It works fine when I run the application without login.If I logged in I got the following error when I put the breakpoint into my code,
Microsoft JScript runtime error: 'document.getElementById(...)' is null or not an object,It shows at the following Line at the Home[dynamic] page.
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Nov 19, 2010
i am using the multiview control inside a page and i am trying to find a control using the javascript function document.getElementById. My Problem is that the function returns null cause it cannot find the control. When i open the code of the page from the browser the active view is not rendered so I think thats the reason why I am getting a null value from the function.
On the HTML code is rendered only the first view or the view that is activated on page load.
Is there any way to find a control inside the view using javascript? or I am doing something wrong?
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Oct 9, 2010
I am tryting to reach controls in the gridview rows by RowCommand event. I can take values of controls which are binded to gridview source successfully . But for all other controls which is not binded to gridview returns NULL value. All controls run at server. Why is that?
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Jul 2, 2010
I am working on a project and I need to use Master/Details view, the problem is everything works fine except when I place the Master (gridview) and Details(FromView) in different content holder.
The error I get is:
Could not find control 'GridView1' in ControlParameter 'ID'.
Description:
An unhandled exception occurred during the execution of the current web request. review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.InvalidOperationException: Could not find control 'GridView1' in ControlParameter 'ID'.
My code is:
[Code]....
[Code]....
[Code]....
[Code]....
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Jul 29, 2010
I am using ASPNET2008 with VB Scripting and not C# Scripting I am encountering new problem.
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In the GRIDVIEW1 on the left edge one of the column is SELECT button which let the userclick on it to select the specific CUSTOMERID on the column next to it on the right.
Here are the coding from SOURCE
<asp:ButtonField ButtonType="Button" Text="Select" CommandName="SelectClick" DataTextField="CustomerID" >
</asp:ButtonField>
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Sep 3, 2010
I use jquery facebox as delete confirmation box. When i do a delete it removes my record and i show the resultsdiv via javascript. But it always shows
Error: document.getElementById("ImageButtonDiv") is null
here is my code,
[code]....
EDIT:
When my delete confirmation is not within a jquery facebox it gets my element. What could be the issue?
I ve replaced but still not working,
[code]....
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Feb 13, 2010
I have a DataTable for which a PrimaryKey constraint has been set to be a combination of an integer column and a datetime column. When I try to 'Find' a row by saying,
dtFunds.Rows.Find(iContainerIndex)
I get a null value. iContainerIndex has been defined as an object array of size 2 with the integer ID and date values in it.
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What am I doing wrong here? The very same DateTime value is present in the datatable.
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Nov 1, 2010
why the below javascript code always returns null (mean alert) ?
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="WebApplication3.WebForm1" %>
<%@ Register Assembly="Telerik.Web.UI" Namespace="Telerik.Web.UI" TagPrefix="telerik" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<telerik:RadScriptManager ID="RadScriptManager1" runat="server">
</telerik:RadScriptManager>
<div>
<telerik:RadComboBox ID="RadComboBox1" runat="server">
</telerik:RadComboBox>
</div>
<telerik:RadCodeBlock ID="RadCodeBlock1" runat="server">
<script type="text/javascript">
var combo = $find("<%= RadComboBox1.ClientID %>");
alert(combo);
</script>
</telerik:RadCodeBlock>
</form>
</body>
</html>
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Jul 30, 2010
I want to use multiple targets with my ModalPopUp extender. One of my buttons is set as target in the ModalPopup and the other one will use server-side code to show the ModalPopup.
This is my ModalPopup so far:
<msAjax:ModalPopupExtender ID="modalInform" runat="server"
BehaviorID="modalInform"
TargetControlID="btnSearchUsers" [code].....
Then I found this little tutorial on the ASP.NET AJAX site.But when I use $find("modalInform") in the pageLoad Javascript function (as defined in the tutorial at the bottom), I'm always getting a $find("modalInform") is null error.
This code is included in a usercontrol, the usercontrol is used in a ASPX page and this ASPX-page uses a MasterPage.
I've noticed that if I'm using
<%= modalInform.ClientID %>
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Aug 30, 2013
I have a dropdownlist attached to a cell when edit is selected. I am using the following code to populate the drop down list with the value that is on the row.
dlBU.Items.FindByValue((e.Row.FindControl("lblBU") as Label).Text).Selected = true;
This works famously when I have a value in the cell. It fails when the cell has not yet been populated. Is there an if then clause that if the value of e.Row.findcontrol("lblBU") is null no default value?
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May 11, 2010
I'm creating a confirm delete like popup with an iframe to use along with a gridview. When you click delete on a gridview row, the iframe shows up and asks if you would like to delete the associated image as well from the server. It works perfectly the first time I delete a row. After that whenever I click select or edit on a new row, it calls the rowdeleting event from the last deleted entry every time. I'm stumped.Here's the Sub:
'// Event that Occurs when the Delete Button is Clicked //'
Protected Sub Confirm_Delete(ByVal sender As Object, ByVal e As GridViewDeleteEventArgs) Handles GridView1.RowDeleting
Dim file_name As Array = Split(GridView1.Rows.Item(e.rowIndex).Cells.Item(10).Text, "/")
If file_name.getLength(0) = 1 Then
file_name = Split(GridView1.Rows.Item(e.rowIndex).Cells.Item(10).Text, "")
End If
Dim fn As String = file_name(file_name.getLength(0) -1)
fn = replace(fn, ",", "%2C")
fn = replace(fn, " ", "%20")
Dim url As String = Me.Master.get_root_url & "CrimeBulletinProject/ConfirmDelete.asp?img_list=" & fn & "~!"
confirm_delete_frame.Attributes.Add("src", url)
confirm_delete_frame.Attributes.Add("style", "display: block; left: 50%")
End Sub
Here's the GridView:
<!-- // Main Data Table Section // -->
<asp:GridView ID="GridView1" runat="server" AllowPaging="True" AllowSorting="True" AutoGenerateColumns="False" BackColor="Black" BorderColor="#E7E7FF" BorderStyle="None" BorderWidth="1px" CellPadding="3" DataKeyNames="ID" DataSourceID="ArrestsDB" CellSpacing
= "1" GridLines="None" CssClass = "GV_Row" >
<PagerSettings Mode="NumericFirstLast" Position="TopAndBottom" />
<RowStyle CssClass = "GV_RowStyle" />
<Columns>
<asp:CommandField ButtonType="Button" ShowDeleteButton="True" CausesValidation = "True"
ShowEditButton="True" ShowSelectButton="True" HeaderText="Options" />
<asp:BoundField DataField="ID" HeaderText="ID" InsertVisible="False"
ReadOnly="True" SortExpression="ID" />
<asp:TemplateField HeaderText="Photo">
<ItemTemplate>
<img class = "GridViewImg" onclick = "popup_EnlargePhoto_EditForms(this.id)" id = "<%# DataBinder.Eval(Container.DataItem, "FileNumber") %>, <%# DataBinder.Eval(Container.DataItem, "LastName") %>, <%# DataBinder.Eval(Container.DataItem, "FirstName") %>"
alt = "<%# DataBinder.Eval(Container.DataItem, "LastName") %>, <%# DataBinder.Eval(Container.DataItem, "FirstName") %>" src = "<%# DataBinder.Eval(Container.DataItem, "PhotoLink") %>"></img>
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField DataField="FileNumber" HeaderText="File #"
SortExpression="FileNumber" />
<asp:BoundField DataField="LastName" HeaderText="Last Name"
SortExpression="LastName" />
<asp:BoundField DataField="FirstName" HeaderText="First Name"
SortExpression="FirstName" />
<asp:BoundField DataField="MiddleName" HeaderText="Middle Name"
SortExpression="MiddleName" />
<asp:BoundField HeaderText="DOB (mm/dd/yyyy)" SortExpression = "DOB" DataField = "DOB" DataFormatString = "{0:MM/dd/yyyy}" />
<asp:BoundField DataField="Charge" HeaderText="Charge"
SortExpression="Charge" />
<asp:BoundField DataField="OfficerInCharge" HeaderText="Officer"
SortExpression="OfficerInCharge" />
<asp:BoundField DataField="PhotoLink" HeaderText="Photo Link"
SortExpression="PhotoLink" />
<asp:BoundField DataField="LocationOfArrest" HeaderText="Location Of Arrest"
SortExpression="LocationOfArrest" />
<asp:BoundField DataField="AdditionalInfo" HeaderText="Additional Info"
SortExpression="AdditionalInfo" />
<asp:BoundField DataField="Zone" HeaderText="Zone" SortExpression="Zone" />
<asp:BoundField DataField="DateOfArrest" HeaderText="Date Of Arrest (mm/dd/yyyy)"
SortExpression="DateOfArrest" DataFormatString="{0:MM/dd/yyyy}" />
<asp:BoundField DataField="DateAdded" HeaderText="Date Added (mm/dd/yyyy)"
SortExpression="DateAdded" DataFormatString="{0:MM/dd/yyyy}" />
</Columns>
<FooterStyle BackColor="#B5C7DE" ForeColor="#4A3C8C" />
<PagerStyle BackColor="#E7E7FF" ForeColor="#4A3C8C" HorizontalAlign="Center" />
<SelectedRowStyle CssClass = "GV_SelectedRow" />
<HeaderStyle CssClass = "GV_Header" />
<AlternatingRowStyle CssClass = "GV_AltRowStyle" />
</asp:GridView>
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Feb 15, 2011
[Code]....
If I use $get, it does work as the expected functionality for $get. It is only $find that does not work.
Can anyone explain the problem?
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Sep 6, 2010
I have a gridview with a nested placeholder in each rows. I nested some checkboxes in each placeholders in each rows dynamically, so their ServerIDs are not the same (I dont want to use nested gridview). at the end in a button event I want to count checked checkboxes in gridview while I can not use findcontrol() method in each rows to find checkboxes due to their different ServerIDs.
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Jan 14, 2010
I have a gridview,when i do it is giving me null object reference error.
I am posting my code for your reference -
[Code]....
My gridview code is -
[Code]....
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Aug 24, 2010
I have a gridview. In the rowupdating event, the txtbox returns null. I have enabled viewstate for the gridview. But still it does not work. I have made this in Kentico.
<asp:GridView ID="GridView1" runat="server" AllowPaging="True" AllowSorting="True"
AutoGenerateColumns="False" DataKeyNames="id" DataSourceID="SqlDataSource1" EnableModelValidation="True"
OnRowUpdating="GridView1_RowUpdating" >
<Columns>
<asp:CommandField ShowDeleteButton="True" CausesValidation="false" ShowEditButton="True"
ControlStyle-Width="100px" />
<asp:TemplateField HeaderStyle-HorizontalAlign="Left" HeaderText="Name" SortExpression="name">
<ItemTemplate>
<asp:Label ID="lblRegionName" runat="Server" Text='<%# Bind("name") %>' Width="200px"></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox runat="server" ID="EditRegionName" OnTextChanged="EditRegionName_Updated"
Text='<%# Bind("name") %>' Width="200px" />
</EditItemTemplate>
<FooterTemplate>
<asp:TextBox runat="server" ID="InsertRegionName" Text='' Width="200px" />
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderStyle-HorizontalAlign="Left" HeaderText="Archived" SortExpression="IsArchive">
<ItemTemplate>
<asp:CheckBox ID="lblArchive" Enabled="false" runat="Server" Checked='<%# DataBinder.Eval(Container.DataItem, "archived") %>'
Width="100px" />
</ItemTemplate>
<EditItemTemplate>
<asp:CheckBox runat="server" OnCheckedChanged="EditArchive_CheckedChanged" ID="EditArchive"
Width="100px" />
</EditItemTemplate>
<FooterTemplate>
<asp:CheckBox runat="server" ID="InsertArchive" Checked="false" Width="100px" />
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField ShowHeader="False">
<ItemTemplate>
<asp:LinkButton ID="btnHistory" runat="server" Text="History"></asp:LinkButton>
<ajaxToolkit:ModalPopupExtender OkControlID="OkButton" ID="ModalPopupExtender1" runat="server"
BackgroundCssClass="modalBackground" TargetControlID="btnHistory" PopupControlID="Panel1" />
<asp:Panel ID="Panel1" runat="server" CssClass="modalPopup" Style="display: none">
<div>
<iframe frameborder="0" src="/CMSWebParts/MSM/RoundTableAfrica/Beheer/History.aspx?id=<%# DataBinder.Eval(Container.DataItem, "id") %>"
width="500px" height="100%" scrolling="no"></iframe>
<br />
<asp:Button ID="OkButton" runat="server" Text="OK" CausesValidation="false" Width="50" />
</asp:Panel>
</div>
</ItemTemplate>
<EditItemTemplate>
</EditItemTemplate>
<FooterTemplate>
<asp:Button ID="btnInsert" runat="server" Text="Insert" OnClick="Insert_Click" />
</FooterTemplate>
</asp:TemplateField>
</Columns>
<EmptyDataTemplate>
Region Name:<asp:TextBox runat="server" ID="NoDataRegionName" />
Archived:<asp:CheckBox runat="server" ID="NoDataIsArchive" />
<asp:Button runat="server" ID="NoDataInsert" CssClass="contentButton" Text="Insert"
OnClick="Button1_Click" />
</EmptyDataTemplate>
</asp:GridView>
<asp:Button runat="server" ID="Add" Text="Add" OnClick="Add_Click" />
<asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:RTAConnectionString%>"
ProviderName="System.Data.SqlClient" SelectCommand="select * from [spiderwebs_region] order by name "
UpdateCommand="UpdateRegionWithHistory" UpdateCommandType="StoredProcedure"
DeleteCommand="DeleteRegionWithHistory" DeleteCommandType="StoredProcedure" OnInserting="Sqldatasource1_Inserting"
OnInserted="Sqldatasource1_Inserted" InsertCommand="InsertRegionWithHistory"
InsertCommandType="StoredProcedure">
<DeleteParameters>
<asp:Parameter Name="id" Type="Int32" />
</DeleteParameters>
<InsertParameters>
<asp:Parameter Name="action_time" Type="DateTime" />
</InsertParameters>
<UpdateParameters>
<asp:Parameter Name="content_type_id" Type="Int32" />
<asp:Parameter Name="object_repr" Type="String" />
<asp:Parameter Name="action_flag" Type="Int32" />
</UpdateParameters>
</asp:SqlDataSource>
Code Behind:
protected void Page_Load(object sender, EventArgs e)
{
GridView1.DataBind();
}
protected void GridView1_RowUpdating(Object sender, GridViewUpdateEventArgs e)
{
int index = e.RowIndex;
GridViewRow currentrow = ((GridView)sender).Rows[index];
TextBox txtbox = (TextBox)currentrow.FindControl("EditRegionName");
CheckBox isarchive = (CheckBox)currentrow.FindControl("EditArchive");
e.NewValues["name"] = txtbox.Text;
e.NewValues["archived"] = isarchive.Checked;
GridView1.EditIndex = -1;
GridView1.DataBind();
}
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Oct 7, 2010
Since I am not using a DataSourceId at the markup I am having to create my own Sorting handler. I found a sample on MSDN but the variable 'dataTable' always returns null why?
[Code]....
and here is how I am feeding the DataGrid:
[Code]....
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Mar 31, 2011
I have a simple page containing a GridView control that generates thead and tbody tags after rendering. In my jQuery script, I have a line that reads this way:
$('#GridView1
thead').eq(0).html()
When the page loads for the first time, this script returns an objects and works well. But when I click a button and cause a postback, it returns null. By the way, the button changes the number of the rows returned from the data source (based on the value of a textbox) and updates the grid.
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Dec 7, 2010
I have a treeView on my main page. While the page is postback the method TreeView.FindNode works fine. But when i return to main page from another, and loading ValuePath from session it returns null.
here is my treeView [Code]....
Code behind to save values in session on Page_Load:
[Code]....
Code behind to select TreeNode after return from other page on PageLoad
[Code]....
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Dec 10, 2010
I am getting the Null reference exception in
[Code]....
also when I used the Quickwatch, I get this error message.
getElementById The name 'getElementById' does not exist in the current context
I am also using Master Pages.
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Feb 15, 2011
I have a data gridview with two columns (Databound- HTML tags), very similar to the one of twitter,the second column populated as follows:
USERNAME: COMMENTDate
i need to add "Report this Comment" button next to the date, once clicked the user will be forward it to another form holding all of the above information related to this special row.
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Oct 20, 2010
Nested GridView Control returns "Object variable or With block variable not set" when outer GridView returns rows.
The Nested GridView Control works as long as the outer GridView returns rows, the following code works: [Code]....
Object variable or With block variable not set.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.NullReferenceException: Object variable or With block variable not set.
Source Error:
Line 118: If e.Row.RowType = DataControlRowType.DataRow Then
Line 119: Dim myStatus_ID As SqlDataSource = CType(e.Row.FindControl("sqlDeviceStatusAssign"), SqlDataSource)
Line 120: If Not e.Row.DataItem("Status_ID") Is Nothing Then
Line 121: myStatus_ID.SelectParameters(0).DefaultValue = e.Row.DataItem("Status_ID")
Line 122: End If
I have tried checking for IsDbNull and checking to see if a label exists in a given row. This code *If Not e.Row.DataItem("Status_ID") Is Nothing Then* appears to do nothing.Same with the following:
*Dim localLblItemReference As Label = CType(e.Row.FindControl("lblItemReference"), Label)
*If Not localLblItemReference Is Nothing Then
******************************************************************************************
To further clarify my question above, I am looking for a method to detect e.Row.DataItem("Status_ID") is nothing/null due to the outer GridView returning 0 results in a query.I have a (Outer) GridView Control with another GridView Control inside of a template field with it's associated SqlDataSource control.
In the "Protected Sub GridViewReport_RowCreated", I provide the Select Parameter for the associated SqlDataSource with the DataItem row value.When the (Outer) GridView Control does not return any rows, the "e.Row.DataItem("Status_ID")" throws a:
Exception Details: System.NullReferenceException: Object variable or With block variable not set.
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Aug 9, 2010
I can't figure out what I"m doing wrong.. I followed this sample online at
http://www.4guysfromrolla.com/articles/091102-1.aspx to include a gridview in an email. But, it keeps throwing this error.. 'GridView' must be placed inside a form tag with runat=server.I've verified that the gridview is in a form, and there are no template fields in the gridview. Heres the gridview on my asp.net page..
[Code]....
[Code]....
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May 9, 2010
protected void Button19_Click(object sender, EventArgs e)
{
SqlDataSource conn = new SqlDataSource();
conn.ConnectionString = ConfigurationManager.ConnectionStrings["Database2ConnectionString1"].ToString();
conn.SelectCommandType = SqlDataSourceCommandType.Text;
conn.SelectCommand = "SELECT FROM table1 (a, b)VALUES(@a,@b)";
conn.SelectParameters.Add("a",TextBox1.Text);
conn.SelectParameters.Add("b", TextBox2.Text);
int rowsAffected = 0;
try
{
rowsAffected = conn.Selectt();
}
catch (Exception)
{
Label1.Text = "Error";
}
finally {
conn = null;
}
if (rowsAffected != 0)
{
Label1.Text = "Data saved";
}
}
well it returns error no overloading method for select (P.S. same code work fine for insert)
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