Forms Data Controls :: GridView W/ Dynamic BoundFields Disappears On Postback In IE Only?
May 4, 2010
have an ASP.net 4.0 page containing a GridView, where during the Page_Init event I'm dynamically adding BoundField columns to the gridview. I also have some custom sorting and paging methods that I use with this gridview, which result in postbacks on the page. In Chrome, Firefox, Safari, and Opera the gridview behaves as expected. HOWEVER, in IE 6, 7, or 8 when I click to sort a column in the gridview, or go to the next page of results in the gridview, it does not bind on postback, returning nothing back to the browser. Again, in anything but Internet Explorer, paging and sorting (frankly any postback event) brings back the gridview in its expected state. I only have the problem in IE. Relevant snippets of my code follow, where you'll see my Page_Init event calling a method in my WebFunctions class to add the BoundField columns for the table I pass to it, and my Page_Load event that calls the method in the user control responsible for binding my dataset to the gridview. Initial page load works in all browsers, but postback loading of the gridview only works in non-IE browsers.
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Jan 13, 2010
I have a gridview where in the users are allowed to edit certain data and there is an update on top of the page which will send out all the changes made inside the GridView. But, the problem is , as soon as the update button is clicked, the grid disappearsand no update is made. This problem occurs when the size of the data on the page is huge. When we have less amount of data on the gridview, It does update. But, when there is a huge amount of data on the gridview, it does not. We have tried to increase the page size on the server, but to no use.
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Feb 23, 2010
I've got a Gridview in which I use the RowDataBound handler to color the lines according to certain conditions
(ie if column x is value y then change the background-color of the row to z etc).
One problem though, as soon as I do a postback the coloring disappears altogether and all rows become white.
Is there some way around this so I can retain my background colors even after a postback?
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Jun 1, 2010
I have a datarepeater inside which I load a gridview. After the grid's binding is done I create an extra header line to group the columns (that's the only way I could do it, I couldn't figure a way to add an event for a control inside the repeater).That works fine and the page displays perfectly.However everytime I do a postback from other controls, I lose the 2nd header and 1 extra empty line appears at the top of the gridview
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Oct 1, 2013
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
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my data in gridview4 disappears when i click add to cart it shows no data again i have to pass a query from gridview 3 and then gridview 4 appears and then again if i click on add to cart in gridview 4 it shows no data.
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Apr 1, 2010
One of the gridviews looks like this:
Q1 SQ1 A1
Q1 SQ1 A2
Q1 SQ1 A3
Q1 SQ2 A1
Q1 SQ2 A2
Q1 SQ2 A3
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All fields are BoundFields (except radiobuttons). They can't be converted to templates, I am using boundfields for row-level displaying in RowDataBound.Each row has a radiobutton and only one radio button should be selected per subquestion (SQ).How I can ensure only one answer is selected per subquestion? On radiobutton click or on submit?
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Nov 10, 2010
i am trying to combine two boundfields into one calculated column to display in Gridview like:
[code]....
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Dec 23, 2010
(Example code below)
I have a GridView. It has a 'static' TemplateField (in the .aspx page). I add and remove BoundFields to it depending on user preferences on postback. Affter the second postback, the template field appears empty.
Here is a stripped down mockup of what I'm doing. You can click the "Regular Postback" button as much as you want, and nothing bad happens. But if you click the "Recreate" button once-- it's all ok. Click it again, and the "one" column goes on Christmas break.
So is there something else I should be doing, or is this going to be a "halcyon1234 to code interface" error.
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Jan 13, 2010
My datasource is an ado data table that I have convert to a new data table so that each row in the original table is now a column with 1 row in my new table. I then bind the new datatable and create dynamic template fields with a text box where I bind the values. My problem is, when I try and retrieve the values changed by the user in the rowcommand event, the template columns no longer exists.
Does anyone know how i can retrieve these values? I've read over and over that you have to rebind the grid on each postback when you use dynamic templates, but I'm not sure how to do that and retrieve the values entered in the text boxes on the client side.
[Code]....
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Feb 18, 2010
I have a DetailsView (DV) control, an ObjectDataSource (ODS) control, and a button on a page. I have 2 classes in the App_Code directory (Customer and CustomerDAO). The DAO class provides static methods for the ODS control and simply hack values in (ie...no real database selects/updates). The Customer class has 2 properties (Id and Name) and a default constructor. The page takes an ID on the querystring and determines if the DV control is in insert or edit mode. If in edit mode, it sets the SelectParameter on the ODS (id field), calls ODS.Select(), and then calls DV.DataBind(). The existing (although fake) customer is loaded and display properly when this happens. I then change the name of the Customer in the DV and click the Button to save the new data.
Everything seems to be wired up correctly as the UpdateMethod that is specified in the ODS control is called and succeeds (even in my real example with my database). The problem is that the BoundFields in the DV control have not been updated with the new values and therefore the existing values are updated in the database and my changes are lost. I have handled the OnUpdating event of the ODS and the values are still the old values. I have also handled the OnItemUpdating event of the DV control and the NewValues IOrderedDictionary still has the old values in it also. In looking at the MSDN article for the UpdateMethod, it states the following:
Parameter Merging
Parameters are added to the UpdateParameters collection from three sources:
From the data-bound control, at run time.
From the UpdateParameters element, declaratively.
From the Updating event handler, programmatically.
I am using the BoundField classes in my DV control so I would have assumed that the first bullet above would have handled the updating of values, but it doesn't appear to work with the way I am doing it. If I set the values explicitly in the OnUpdating event that is fired by the ODS control (the 3rd bullet) the right values are updated (again...even in my real database situation). It seems like my only issue is that the automatic binding that I expect from the DV control isn't working as I would expect it to. Here is the code that I have in my fake example:
[Code]....
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Jul 24, 2010
I'm trying to figure out why my gridview disappears when I trigger the rowediting event.
The Gridview:
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The code-behind:
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When I click on the edit linkbutton, the gridview disappears. What is going wrong?
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Jan 18, 2011
I use Server.Transfer("pagename", True) to navigate from a page where two dates have been selected to a page with a gridview that uses the dates to query the database and display the results. The gridview initially displays correctly but when I operate the select or sort it disappears.
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Jan 21, 2011
I am populating a column in a gridview with a dropdownlist as follows:
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[Code]....
When I edit the gridrow, the dropdown is there and I can select a new item.
But I can't find the dropdown during the rowupdated event. The cell control says it's a Textbox. All of the other items in the row are fine and I can get the data back. But I can't get the DropDown item.
Here are some of the things I have tried in the RowUpdating event:
DropDownList test = (DropDownList)e.FindControl("ddlPeriod");
//null
DropDownList ddl = (DropDownList)GridView1.Rows[e.RowIndex].FindControl("ddlPeriod");
//Also null
var test = row.Cells[8].Controls[0];
//Says its a textbox.
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Apr 19, 2010
I have an ASP.NET Dynamic Data web application, with an entity called ActivationResource. One of the properties of this is a CellPhone field. Now, whenever I open a List or Details view of one of these entities, the cell phone number displays for a moment then disappears.
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Apr 1, 2011
I have a gridview with daatsource from MembershipUserCollection. When my collection doesn't contain any records the gridview just disappears. I want to display the empty gridview indicating no records exist rather than the grid just become invisible.
How to make gridview always visible ?
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Jul 28, 2010
I have a page with a TextBox, a Button, a GridView, and a SqlDataSource. I click the Button to execute the SQL in the TextBox using the SqlDataSource. The SqlDataSource populates the GridView. Everything works as expected until I click a column heading to sort.
When I click a column heading, the GridView disappears and I have to click the Button to display the grid again. When I do, the grid is displayed in the order of the column I clicked.
I don't understand why the GridView is disappearing when I click a column header.
Does anyone know how to fix this so the GridView is sorted and displayed only by clicking the column header?
ASPX:
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Code behind:
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Jun 15, 2010
I have a small problem I am returning some data from a query and have allowed paging, however when I click on the next button to view the following page the gridview disappears.
My datasource is specified in the code behind:
<asp:Panel ID="dtpanel" runat="server" Visible="False">
<asp:GridView ID="grddetails" runat="server" AutoGenerateColumns="False" AllowPaging="True"
OnPageIndexChanging="grddetails_SelectedIndexChanged" ViewStateMode="Enabled"
onselectedindexchanged="grddetails_SelectedIndexChanged" AllowSorting="True" >
<Columns>
<asp:BoundField DataField="Col1" HeaderText="Col1" SortExpression="Col1" />
<asp:BoundField DataField="Col2" HeaderText="Col2" SortExpression="Col2" />
<asp:BoundField DataField="Col3" HeaderText="Col3" SortExpression="Col3" />
<asp:BoundField DataField="Col4" HeaderText="Col4" SortExpression="Col4" />
<asp:BoundField DataField="Col5" HeaderText="Col5" SortExpression="Col5" />
<asp:BoundField DataField="Col6" HeaderText="Col6" SortExpression="Col6" />
</Columns>
</asp:GridView>
</asp:Panel>
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data;
using System.Data.SqlClient;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void GridView2_SelectedIndexChanged(object sender, GridViewCommandEventArgs e)
{
int y = Convert.ToInt32(e.CommandArgument);
Control control = GridView2.Rows[y].Cells[0].Controls[0];
LinkButton btn = control as LinkButton;
string qval = btn.Text;
string query = "SELECT * FROM Table WHERE Col LIKE '%" + qval + "%'";
string connectionString = @"Data Source=servername;Initial Catalog=dbname;Integrated Security=True";
SqlConnection accessConnection = new SqlConnection(connectionString);
SqlCommand accessCommand = new SqlCommand(query, accessConnection);
SqlDataAdapter grddetailsDataAdapter = new SqlDataAdapter(accessCommand);
DataTable grddetailsDataTable = new DataTable("Table");
grddetailsDataAdapter.Fill(grddetailsDataTable);
int dataTableRowCount = grddetailsDataTable.Rows.Count;
if (dataTableRowCount > 0)
{
grddetails.DataSource = grddetailsDataTable;
grddetails.DataBind();
}
dtpanel.Visible = true;
}
protected void GridView1_SelectedIndexChanged(object sender, GridViewCommandEventArgs e)
{
int w = Convert.ToInt32(e.CommandArgument);
Control control = GridView1.Rows[w].Cells[0].Controls[0];
LinkButton btn = control as LinkButton;
string qval2 = btn.Text;
Label1.Text = btn.Text; string query = "SELECT * FROM Table WHERE Col LIKE '%" + qval2 + "%'";
string connectionString = @"Data Source=servername;Initial Catalog=dbname;Integrated Security=True";
SqlConnection accessConnection = new SqlConnection(connectionString);
SqlCommand accessCommand = new SqlCommand(query, accessConnection);
SqlDataAdapter grddetailsDataAdapter = new SqlDataAdapter(accessCommand);
DataTable grddetailsDataTable = new DataTable("Table");
grddetailsDataAdapter.Fill(grddetailsDataTable);
grddetails.DataSource = grddetailsDataTable;
grddetails.DataBind();
dtpanel.Visible = true;
}
protected void grddetails_SelectedIndexChanged(object sender, GridViewPageEventArgs e)
{
DataTable dataTable = grddetails.DataSource as DataTable;
grddetails.PageIndex = e.NewPageIndex;
grddetails.DataBind();
dtpanel.Visible = true;
}
}
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Mar 16, 2010
I have a gridview with Edit buttons, which turn into Update buttons when pressed:
[Code]....
It worked fine before I added DBInterfaceGridView_RowEditing handler:
[Code]....
Now it seems to be working in Debug mode, but in Release when I press Edit, the gridview just disappears.
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Oct 9, 2010
If there's a better way to accomplish what I'm attempting I haven't found it yet. That being said, I have create a gridview like the one here,[URL]And with some minor tweaking it working great for all my fields, checkboxes, etc. The issue is my last column is another gridview, and I'd like it to function the same. that is, a dynamic gridview inside of a dynamic gridview. I get that I have to create it initially with null values or it won't show up. I guess what I'm having trouble figuring out is instead of go will null data in the parent gridviews column, do I place my blank child gridview. Do I create and bind the child gridview first, or second. Generally just not sure. Also, as far as storing the data from the child gridview goes, will each one need it's own datatable?
[Code]....
[Code]....
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Mar 31, 2010
i am creating gridview with dynamic template, and the grid is disappear while postback. my code is below.
i am using GridViewTemplate class to generate Templates
Public Class GridViewTemplate
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Jan 7, 2011
I am creating a custom control to show message to the user. The custom control is having 2 labels and one button.
I dragged the control in aspx page .
<cc1:MessageBox ID="MessageBox1" runat="server" />
Then i am calling a methos called show to show message to the user.
MessageBox1.Show("applicationname", "Message");
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Jan 19, 2010
I've coded myself into a state of confusion. I have a form with a postal code TextBox and a country DropDownList both inside an UpdatePanel. When the selected country is changed, the DropDownList auto posts back and sets the regular expression used for validating the postal code. The country DropDownList also has a RequiredFieldValidator. The first item in my DropDownList is empty (Value = Text = String.Empty) and when I select this item, I momentarily see the RequiredFieldValidator appear and then disappear. It seems that the client side script is displaying the error message, but then after my partial postback it disappears. I can see in the country DropDownList's SelectedIndexChanged event handler that the RequiredFieldValidator has IsValid = false, so why doesn't the error message stay visible?
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Nov 16, 2010
I have a dropdown on page, a place holder and a save button on my form.Now, I am creating a textbox on selectedIndexChanged event of dropdown list and adding it to placeholder. And on button click I want to access the control, but on click event, I find the textbox as null. Here is my code
protected void Dropdownlist1_SelectedIndexChanged(object sender, EventArgs e)
{
if (Dropdownlist1.SelectedValue != string.Empty)
And button Save click event
protected void btnSave_Click(object sender, EventArgs e)
{
TextBox txt = new TextBox();
txt = (TextBox)this.ElementPlaceHolder.FindControl("txtArea");
[Code]....
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Dec 11, 2013
I have a Webform with a TextBox (Static) and 3 TextBox (Dynamic - based on the following article: [URL].... )
How to use this scenario with a single GridView table?
Based on the User input, the GridView might have (1 + 3) columns; (1 + 6) columns; (1 + 9) columns; ...etc.
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Jun 15, 2013
I have created a web form in which i have used user control there is link button on different link button user control loads . i have added dynamically webcontrol to that link button . they are loading properly but when i try to save data through one of user control on click of button the user control disapper from that place but when i put static user control to my page its working
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