My GridView is as following has one column Training Details with HyperLink
<asp:GridView ID="gvTrainingItems" runat="server"....
......
......
<asp:TemplateField HeaderText="Training Details" HeaderStyle-Wrap="true">
<ItemTemplate>
<asp:HyperLink ID="lnkTrainingItemDetails" runat="server" NavigateUrl='<%#"~/TrainingItemDetails.aspx?ItemId=" + DataBinder.Eval(Container.DataItem,"itemId").ToString().Trim() + "&EmpId=" + Request.QueryString["EmpId"].ToString() %>'
Name='link' CssClass="btn btn-info" Target="_blank">View</asp:HyperLink>
</ItemTemplate>
<ItemStyle HorizontalAlign="Center" VerticalAlign="Middle" Wrap="False"></ItemStyle>
</asp:TemplateField>
....
Right now I am confused on how to get the NagivateUrl value from this GridViewRow?
I have tried something like
GridViewRow row = gvTrainingItemsPending.Rows[e.RowIndex];
.....
((HyperLink) row.Cells[10].Controls[0]).NavigateUrl
but it returns the following error. Can I get some help? Thanks!
Unable to cast object of type 'System.Web.UI.LiteralControl' to type
'System.Web.UI.WebControls.HyperLink'.
You may consider using the FindControl method to pull this out. This will pull out the control regardless of the cell in the row.
GridViewRow row = gvTrainingItems.Rows[e.RowIndex];
.....
string url = ((HyperLink) row.FindControl("lnkTrainingItemDetails")).NavigateUrl;
I was looking at the incorrect GridView thus the cell number is incorrect, also it is controls[1] in my case. The syntax is correct tho.
Use findcontrol method for getting control id and its value.
Related
I have been trying to write this simple logic of deleting a row from the gridview and from the SQL database of the selected row, but keep getting a null reference to cell, which has the primary key [ID] in a field.
Here's my html:
<asp:GridView ID="grvInventoryEdit" runat="server" BackColor="White" onrowdeleting="grvInventoryEdit_RowDeleting"
onrowediting="grvInventoryEdit_RowEditing"
onrowupdating="grvInventoryEdit_RowUpdating">
<Columns>
<asp:CommandField ShowEditButton="True" />
<asp:CommandField ShowDeleteButton="True" /><asp:TemplateField HeaderText="Id">
<ItemTemplate>
<%#Eval("No")%>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox runat="server" ID="txtEditNo" ReadOnly="True" Text='<%#Eval("No")%>'></asp:TextBox>
</EditItemTemplate>
</asp:TemplateField>........ </Columns> </asp:GridView>
And my back-end code for rowdeleting event is :
protected void grvInventoryEdit_RowDeleting(object sender, GridViewDeleteEventArgs e)
{
TextBox id = (TextBox)grvInventoryEdit.Rows[e.RowIndex].FindControl("txtEditNo");
Asset asset = db.Assets.Single(a => a.No == Convert.ToInt32(id));
db.Assets.DeleteOnSubmit(asset);
db.SubmitChanges();
binddata();
}
and when the event fires, this is what i am seeing while debugging:
I am not sure why i am getting a null value ,though, there is a value for that cell.
Could you tell me what i am doing wrong ?
Regards,
Might be it is due to the readonly property of textbox, not suer.
If you want to use the image button for edit and delete then use
protected void ibtnDelete_Click(object sender, ImageClickEventArgs e)
{
GridViewRow gvRow = (GridViewRow)((ImageButton)sender).NamingContainer;
Int32 UserId = Convert.ToInt32(gvUsers.DataKeys[gvRow.RowIndex].Value);
// delete and hide the row from grid view
if (DeleteUserByID(UserId))
gvRow.Visible = false;
}
For complete code see
You are passing TextBox object instead instead of Text property of TextBox
Asset asset = db.Assets.Single(x=>x.No == Convert.ToInt32(id.Text));
and your TextBox is also coming null means it's unable to find it in GridView, try like this:
TextBox id = e.Row.FindControl("txtEditNo");
Also see this CodeProject article to understand how to use ItemTemplate and EditItemTemplate
why are you adding a second commandfield instead of just enabling the delete button on the existing one.
if you are using a command field you should be supplying an compatible datasource that provides Delete functionality
if you're "rolling your own" delete functionality then just use a regular Button control and supply a CommandName and CommandArgument, such as CommandName="MyDelete" CommandArgument=<row number> where <row number> is supplied via GridView RowDataBound() event.
Regardless of how you choose to implement Delete you should be placing the key field in the GridView DataKeys Property and not as a field within each row. This will make obtaining the PK far easier than what you are trying to do
I guess, in my HTML, i have only the value that's bound to the item, is being displayed, and there are no textboxes in my <ItemTemplate>, hence, it pulls null value. Whereas, in my <EditItemTemplate> there is a textbox, which can pull the value from the cell.
So I changed my HTML to this:
<asp:TemplateField HeaderText="Id">
<ItemTemplate>`<asp:label runat="server" ID="lblEditNo" ReadOnly="True" Text='<%#Eval("No")%>'></asp:label>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox runat="server" ID="txtEditNo" ReadOnly="True" Text='<%#Eval("No")%>'></asp:TextBox>
</EditItemTemplate>
</asp:TemplateField>
and no change in my codebehind, and this resolved the issue.
I have usedgridView for update and delete data. But I'm getting
"Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index" error while updating.
There is no problem in your jquery datetimepicker
Problem seems to be in :
GridViewRow row = GridView1.Rows[e.RowIndex];
Simply take separate link buttons for edit and delete as:
<asp:TemplateField HeaderText="Edit" ItemStyle-Width="150">
<ItemTemplate>
<asp:linkbutton id="lnkEdit" runat="server" CommandName="Edit" Text="Edit"/>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Delete" ItemStyle-Width="150">
<ItemTemplate>
<asp:linkbutton id="lnkDelete" runat="server" CommandName="Delete" Text="Delete" />
</ItemTemplate>
</asp:TemplateField>
I can see you are using dropdownlist for copy_id so it is better to use the below code to find the dropdownlist and fetch value from it.
DropDownList lblCopyDdl= (DropDownList )GridView1.Rows[e.RowIndex].FindControl("lblCopyId");
int Copy_Id = Convert.ToInt32(lblCopyDdl.selectedvalue);
Recommendation::
Better if you use the same code as mentioned above for other fields for getting value..
for eg
int Borrower_Id = Convert.ToInt32((TextBox)GridView1.Rows[e.RowIndex].FindControl("txtBorrowerId").Text);
Update::
If it not works then do check your e.RowIndex as mentioned in Ángel Di María's answer.
Update 2
try to fetch the date field like this
DateTime Date_Borrowed = Convert.ToDateTime((TextBox)GridView1.Rows[e.RowIndex].FindControl("txtDateBorrowed").Text);
and
DateTime Date_Returned= Convert.ToDateTime((TextBox)GridView1.Rows[e.RowIndex].FindControl("txtDateReturned").Text);
It seems that you are trying to read a cell value using index but there is no data element at that position. Suggest you to do debug and increment index value in your collection in watch window and observe data
I am doing a project in .net with c#. in that there is a registration form of new users into the site. admin should approve the registration. for that I'm using a GridView. How to find out the selected row in the grid view?
Use the GridView.SelectedRow property.
Alternatively, you can get the index of the selected row with the GridView.SelectedIndex property.
are you perhaps referring to a DATAGRIDVIEW?
if so, to find the content of a certain column of the selected row
datagridviewname.item(0, datagridviewname.currentrow.index).value
where 0 = first column of your datagrid
Use following gridview property>
gvTradeFile.SelectedRows[0].Cells[10].Value.ToString();
Hope this will help you.
Normally I use RowCommand for this type of thing:
<asp:GridView runat="server" id="gvUsers" AutoGenerateColumns="False">
<Columns>
<asp:BoundField DataField="username" HeaderText="Username" />
<asp:BoundField DataField="dateregistered" HeaderText="Date" />
<asp:TemplateField>
<ItemTemplate>
<asp:LinkButton runat="server" id="lnkApprove" CommandName="Approve" CommandArgument='<%# Eval("userid") %>' Text="Approve"></asp:LinkButton>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField>
<ItemTemplate>
<asp:LinkButton runat="server" id="lnkDeny" CommandName="Deny" CommandArgument='<%# Eval("userid") %>' Text="Deny"></asp:LinkButton>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
Now you need to pass instructions through on RowCommand...
private void gvUsers_RowCommand(Object sender, GridViewCommandEventArgs e)
{
switch (e.CommandName)
{
case "Approve":
// Executes code to update the users table,
// setting the approved flag to true
// Usage: ApproveUser(integer userid);
ApproveUser(e.CommandArgument);
break;
case else:
// do whatever if the user registration wasn't approved
break;
}
}
The switch is a good idea in case you need to do a few things with the data here. It evaluates the primary key value for the row (in this case, that's the value of the userid column in the database) for the selected row (automatically determined when you click the link) along with the CommandName to tell it what to do with that information.
Hope this helps.
I have a requirement to display row number in grid view. What is the best way to display the row number using BoundField or TemplateField?
Note: This need to be done using markup only (without code behind).
Note: When sorting happens, the row number should not be in sequence, the first row should go down with its content.
I have already referred the following:
http://social.msdn.microsoft.com/forums/en-US/winformsdatacontrols/thread/2eead3e3-5cc2-40f7-a91c-8f7942d5329c/
<asp:TemplateField HeaderText="#" >
<ItemTemplate>
<%# Container.DataItemIndex + 1 %>
</ItemTemplate>
</asp:TemplateField>
By the way, this solution proposed in article you referred. Why you don't like it and ask here?
The best place to do this would be to use the templatefield
<asp:TemplateField HeaderText="Row Number">
<ItemTemplate>
<%# Container.DataItemIndex + 1 %>
</ItemTemplate>
</asp:TemplateField>
An examples http://www.devcurry.com/2010/01/add-row-number-to-gridview.html
The BoundField displays the value of specified DataSource field as text.
The TemplateField allows to mix html or make use of web controls.
Please refer to the following explanation to confirm the difference.
http://forums.asp.net/t/1804988.aspx/1
The gridview is rendered as html table. If you don't want to calculate the row number in code behind, you should use JQuery.
var rowCount = $('#myTable tr').length;
And you should fill the table footer with rowCount value.
If we add a customer header to the gridview, will it add extra row?
Currently I have a gridview with four columns and, when I add a custom header gridview coming with a five rows.
My code looks like this...
<asp:TemplateField HeaderText="" ItemStyle-Width="4%" HeaderStyle-HorizontalAlign="Center" ItemStyle-HorizontalAlign="Center">
<HeaderTemplate>
<asp:DropDownList ID="Select" runat="server">
<asp:ListItem>Country</asp:ListItem>
<asp:ListItem>Region</asp:ListItem>
<asp:ListItem>Title</asp:ListItem>
</asp:DropDownList>
</HeaderTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="" ItemStyle-Width="4%" HeaderStyle-HorizontalAlign="Center" ItemStyle-HorizontalAlign="Center">
<ItemTemplate>
<asp:HiddenField ID="Id" Value='<%#Eval("id")%>' runat="server" />
<asp:Literal ID="ltrImage" runat="server"></asp:Literal>
</ItemTemplate>
</asp:TemplateField>
and three other TemplateFields...
Is there any problem of adding header this way? Any other way to add customer header without having this issue?
My desired output should look like this
Search Result Search By (Dropdownlist)
Data column1 Data column2 Data column3 Data column4
The one I am getting now is
Sort By (Dropdownlist)
Data column1 Data column2 Data column3 Data column4
Could anyone help if have an idea?
Thanks in advance
You just added another column with custom header to your gridview. If you want to customize a header of the first column, just customize the header of your first template field:
<asp:TemplateField HeaderText="" ItemStyle-Width="4%" HeaderStyle-HorizontalAlign="Center" ItemStyle-HorizontalAlign="Center">
<HeaderTemplate>
<asp:DropDownList ID="Select" runat="server">
<asp:ListItem>Country</asp:ListItem>
<asp:ListItem>Region</asp:ListItem>
<asp:ListItem>Title</asp:ListItem>
</asp:DropDownList>
</HeaderTemplate>
<ItemTemplate>
<asp:HiddenField ID="Id" Value='<%#Eval("id")%>' runat="server" />
<asp:Literal ID="ltrImage" runat="server"></asp:Literal>
</ItemTemplate>
</asp:TemplateField>
If this dropdownlist is too big or if you want add some additional text in the header, you can always create HeaderTemplate for other TemplateFields of merge some of the column's headers in code behind (example for "merging" two first headers, Id of the gridView is gridView1):
protected void gridView1_PreRender(object sender, EventArgs e)
{
int indexOfColumnToSpan = 0;
int indexOfColumnToRemoveHeader = 1;
gridView1.HeaderRow.Cells[indexOfColumnToSpan].ColumnSpan = 2;
gridView1.HeaderRow.Cells.RemoveAt(indexOfColumnToRemoveHeader);
}
well, you have not actually added a header row, but a header column .. which is basically just another column with more controls ..
why dont you place your DropDownList before your GridView, and then you can write some code behind handling the DropDownList_SelectedIndexChanged event to sort the Data ?
I have implemented this without using the filters within the GridView. Then you can handle the events separately, and populate the GridView accordingly.
What you are actually adding is a column, instead of a row. That's why you are getting that result.
Hope this helps!