I am trying to modify the content of a TextBox in the OnRowEditing event of the gridview but I cannot seem to find the TextBox control in code behind.
The field in aspx:
<asp:TemplateField HeaderText="AssignTo" SortExpression="AssignTo">
<EditItemTemplate>
<asp:TextBox ID="txtAssignTo" runat="server" Text='<%# Bind("AssignTo") %>' ClientIDMode="Static"></asp:TextBox>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label1" runat="server" Text='<%# Bind("AssignTo") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
Trying to find it in code behind:
protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)
{
GridViewRow grow = GridView1.Rows[e.NewEditIndex];
TextBox txt = grow.FindControl("txtAssignTo") as TextBox;
}
The txt variable is always null. Not sure what I am missing here.
You have to bind the gridview after you set the editindex (call its DataBind() method)
Related
I got i strange situations.
This is a part of the ascx code of my gridview
<asp:gridview ID="grdBooks" class="grdBooks" runat="server" width="100%" DataKeyNames="RecId,RefAuthorsRecId,RefBooksTypeRecId" autogeneratecolumns="false" onDataBound="grdBooks_dataBound" onPreRender="grdBooks_preRender" onrowediting="grdBooks_RowEdit" onrowupdating="grbBooks_onRowUpdating" onrowupdated="grdBooks_onUpdated" autogenerateeditbutton="true" onrowcancelingedit="grdBooks_onCancelingEdit">
<Columns>
<asp:TemplateField HeaderText="Title">
<EditItemTemplate>
<asp:TextBox ID="txtgrdTitle" runat="server" width="200px"></asp:TextBox>
<asp:Label ID="lblgrdTitle2" runat="server" visible="false" Text='<%# Eval("Title") %>'></asp:Label>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="lblgrdTitle" runat="server" Text='<%# Bind("Title") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>.....
This is a part of the "onRowEdit" and "onRowUpdating"
protected void grdBooks_RowEdit(object sender, GridViewEditEventArgs e)
{
grdBooks.EditIndex = e.NewEditIndex;
grdBooks.DataSource = book;
grdBooks.DataBind();
TextBox txtTitle = grdBooks.Rows[e.NewEditIndex].FindControl("txtgrdTitle") as TextBox;
Label lblTitle = grdBooks.Rows[e.NewEditIndex].FindControl("lblgrdTitle") as Label;
txtTitle.Text = lblTitle.Text;
}
protected void grbBooks_onRowUpdating(object sender, GridViewUpdateEventArgs e)
{
TextBox txtTitle = grdBooks.Rows[e.RowIndex].FindControl("txtgrdTitle") as TextBox;
....
}
The problem is:
the rowEdit works fine, change all the row of the grid in editable textboxes. The problem is that i write something in the text boxes and when i press "update" and go into the "onRowUpdate" method i haven't the new text(that i have inserted) in the textbox object that i have initialize. I got the old one.
(as u see now i use a not visible label in the editTemplate that carry the value of the original Title. Before i had Eval("title") on the textbox text but i thought that this was the probl so i try this other way)
As your datasource is book.Get the currentrow of the datatable and update values in that row.Then bind the grid again.
GridViewRow gridEditRow = this.grdBooks.Rows[e.RowIndex];
DataRow CurentRow = book.Rows[gridEditRow.DataItemIndex];
CurentRow["Title"] = (gridEditRow.FindControl("txtgrdTitle") as TextBox).Text;
I have a GridView with Template Fields and Connection String is located in the
web.config File. Data is fetched by a stored procedure. I want to retrieve a single cell value of the Gridview in protected void someMethod(object sender, EventArgs e) on OnClick="someMethod" event. But it ends up with:
Object reference not set to an instance of an object.
Code that generates the OnClick Event:
<asp:TemplateField >
<ItemTemplate>
<asp:LinkButton ID="LinkButton1" runat="server" OnClick="someMethod">Get Name</asp:LinkButton>
</ItemTemplate>
</asp:TemplateField>
The value of Gridview Cell i want to get is:
<asp:TemplateField HeaderText="Name">
<EditItemTemplate>
<asp:TextBox ID="forNames" runat="server"></asp:TextBox>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="eForNames" runat="server" Text = '<%# Eval("Name") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
And Code Behind is:
protected void someMethod(object sender, EventArgs e)
{
Label ename = diplayAdapter.SelectedRow.FindControl("eForNames") as Label;
Label5.Text = ename.Text;
}
.ASPX Code:
<asp:TemplateField >
<ItemTemplate>
<asp:LinkButton ID="LinkButton1" CommandArgument="<%# Container.DisplayIndex %>" runat="server" CommandName="FindName">Get Name</asp:LinkButton>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Name">
<EditItemTemplate>
<asp:TextBox ID="forNames" runat="server"></asp:TextBox>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="eForNames" runat="server" Text = '<%# Eval("Name") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
.CS Code
protected void GridView1_OnRowCommand(object sender, GridViewCommandEventArgs e)
{
try
{
//getting rowindex which we have selected by using CommandArgument
int rowindex = Convert.ToInt32(e.CommandArgument);
if (e.CommandName == "FindName")
{
Label5.Text= GridView1.Rows[rowindex].Cells[1].FindControl("eForNames");
}
}
catch (Exception ex)
{
Response.Write(ex);
}
}
Add this to a GridView and now I would like cambial the background color or text showing from code
How can I do it?
<asp:TemplateField HeaderText="01">
<EditItemTemplate>
<asp:DropDownList ID="falta1" runat="server" > </asp:DropDownList>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label1" runat="server" Text='<%# Bind("c1") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
Welcome to stackoverflow. How about...
<asp:TemplateField HeaderText="Type" ControlStyle-BackColor="Black">
You can just hit the space bar within the control tag to see a list of options for different properties, like ControlStyle.
On a side note, you'll get better responses if you post things you've already tried along with your question.
In the code behind, you have to access the label using FindControl in RowDataBound event and then change the color,text of the label.
protected void GridView_RowDataBound(object sender, GridViewRowEventArgs e)
{
if(e.Row.RowType == DataControlRowType.DataRow)
{
Label oLabel = (Label)e.Row.FindControl("Label1");
if(oLabel != null)
{
//oLabel.BackColor = System.Drawing.Color.Red;//See below for cambial
oLabel.BackColor = System.Drawing.ColorTranslator.FromHtml("#FFCC99");
oLabel.Text = "MyText";
}
}
}
Hi I have a grid view with a textbox in each row that im trying to get the value of in the RowCommand event. The below code works fine for all rows expect the first one. The textbox.text value for the first row in always empty.
<asp:GridView ID="GridView1" runat="server" OnRowCommand="GridView1_OnRowCommand" >
<Columns>
<asp:TemplateField>
<ItemTemplate>
Title <%# Eval("Title")%>
<asp:TextBox ID="TextBoxAddPost" runat="server"></asp:TextBox>
<asp:LinkButton ID="LinkButtonAddPost" CommandName="AddPost" CommandArgument='<%# Eval("postId") %>' runat="server">Add Post</asp:LinkButton>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
Code-behind:
protected void Page_Load(object sender, EventArgs e)
{
if(IsPostBack)
bindGridView();
}
protected void GridView1_OnRowCommand(object sender, GridViewCommandEventArgs e)
{
if (e.CommandName == "AddPost")
{
GridViewRow row = (GridViewRow)(((LinkButton)e.CommandSource).NamingContainer);
TextBox textBox = (TextBox)row.FindControl("TextBoxAddPost");
//Empty for first row but works for all others
Debug.WriteLine("row: " + row.RowIndex + ", textBox:" + textBox.Text.Trim());
GridView1.DataBind();
}
}
The above code has been simplified for illustration purposes. Each row actually contains a child gridview, hence why in need the text box in each row. I fear that the binding in the page_load is overwriting the value of the text box, however, without the page_load binding, the rowCommand Event is not fired.
I find i a bit strange the it works fine for all rows except the first.
For getting data from textbox, You have to set text property first by putting below code.
<asp:TextBox ID="TextBoxAddPost" runat="server" Text='<%# Eval("Title") %>'></asp:TextBox>
It will definitely give value from textbox.
Either way, You can also set datakeynames property of gridview.Click here for datakeynames
I tried this and it works fine,GridView1_OnRowCommand fires by clicking on LinkButtonAddPost:
<asp:GridView ID="GridView1" runat="server" OnRowCommand="GridView1_RowCommand">
<Columns>
<asp:TemplateField>
<ItemTemplate>
<asp:TextBox ID="TextBoxAddPost" runat="server" Text='<%# Eval("ID") %>'></asp:TextBox>
<asp:LinkButton ID="LinkButtonAddPost" CommandName="AddPost" CommandArgument='<%# Eval("ID") %>' runat="server">Add Post</asp:LinkButton>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
and change your page_load event like this:
protected void Page_Load(object sender, EventArgs e)
{
GridView1.DataSource = Data.RequestPaymentDB.GetRequestPaymentByRequestID(9208060001);
GridView1.DataBind();
}
compare your code with mine.
hai pupils
I am doing a project on online education. In my project i display the trainees/trainers in in a gridview. If i select any data from the gridview it has to be dispalyed in the label kept below. How can i do this?
Thanks in advance for those who answers.
Use asp:LinkButton to show data in each column. Set commandArgument as the data. set same comandname and handle rowcommand in gridview rowcommand event.
try the following:
in aspx page:
<asp:GridView ID="GridView1" OnRowCommand="GridView1_RowCommand" runat="server">
<Columns>
<asp:TemplateField HeaderText="CategoryID">
<ItemTemplate>
<asp:LinkButton ID="lnkID" runat="server" CommandName="sel" CommandArgument='<%# DataBinder.Eval(Container,"DataItem.CategoryID") %>'
Text='<%# DataBinder.Eval(Container,"DataItem.CategoryID") %>'></asp:LinkButton>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="CategoryName">
<ItemTemplate>
<asp:LinkButton ID="lnkName" runat="server" CommandName="sel" CommandArgument='<%# DataBinder.Eval(Container,"DataItem.CategoryName") %>'
Text='<%# DataBinder.Eval(Container,"DataItem.CategoryName") %>'></asp:LinkButton>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
<asp:Label ID="lblCat" runat="server"></asp:Label>
in aspx.cs page:
protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)
{
if (e.CommandName == "sel")
{
lblCat.Text = e.CommandArgument;
}
}