Develop Reference

Calling button click on file upload inside gridview

I'm trying to upload a file onchange event of the "Fileupload" control inside gridview.
Means when ever user uploads the file, there itself I needs to save the file content in DB.
So, I had mannually called the click event of the button control on the change of fileupload control But its throwing as like exception like "Invalid postback or callback argument...."
my gridview code :
<asp:GridView runat="server" ID="grd" AutoGenerateColumns="false">
<Columns>
<asp:BoundField DataField="StudentID" HeaderText="Student ID" />
<asp:BoundField DataField="StudentName" HeaderText="Name" />
<asp:TemplateField HeaderText="Upload">
<ItemTemplate>
<asp:FileUpload ID="FileUpload1" runat="server" EnableViewState="true" onChange="FileUploadCall(this)" />
<asp:Button ID="btnUpload" Text="Upload" runat="server" OnClick="Upload" Style="display: none" />
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
My script Code :
<script type="text/javascript">
function FileUploadCall(fileUpload) {
if (fileUpload.value != '') {
var a = $('#<%=grd.ClientID %>').find('[id*="btnUpload"]');
a.click();
}
}
</script>
My Hidden Button mannual click creation in cs file :
protected void Upload(object sender, EventArgs e)
{
Button btn = sender as Button;
GridViewRow gvr = (GridViewRow)btn.Parent.Parent;
FileUpload lbleno = (FileUpload)gvr.FindControl("FileUpload1");
lbleno.SaveAs(Server.MapPath("~/Uploads/" + Path.GetFileName(lbleno.FileName)));
//lblMessage.Visible = true;
}

Your jquery code that gets the button to upload may be the reason.
Since you said you are using a gridview, so there could be multiple rows each having its own fileupload and button controls. You need to get the button control associated with this row in grid view. To get the associated button, you should be using the jquery code like below, since the associated button immediately follows the fileupload control.
if (fileUpload.value != '') {
var a = $(fileUpload).next("[id*='Button1']");
a.click();
}

The easiest way is to assign the onchange event from code behind so you can get the correct button easily. So create a RowDataBound event for the GridView.
<asp:GridView ID="grd" runat="server" OnRowDataBound="grd_RowDataBound">
Then in the RowDataBound method, use FindControl to locate and cast the FileUpload and the Button. In the method you can assign the change event to trigger a PostBack of the corresponding button.
protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
//check if the row is a datarow
if (e.Row.RowType == DataControlRowType.DataRow)
{
//use findcontrol to locate the controls in the row and cast them
Button btn = e.Row.FindControl("btnUpload") as Button;
FileUpload fu = e.Row.FindControl("FileUpload1") as FileUpload;
//assign the button postback to the change of the fileupload
fu.Attributes.Add("onchange", "__doPostBack('" + btn.UniqueID + "','')");
}
}

Your implementations is fine only change:
a.click(); => a[0].click(); //important!!
and I hope no binding is happening in the postback:
if (!IsPostBack)
{
var list = new List<Student>();
list.Add(new Student() {StudentID = 1, StudentName = "111"});
list.Add(new Student() {StudentID = 2, StudentName = "222"});
grd.DataSource = list;
grd.DataBind();
}
I've tested it works totally fine!

How to delete a row in gridview after clicking the delete button in a form

I have an aspx page that has a gridview with 3 fields and one button "Update". When I click on the Update button I'll be redirected to another aspx page that has a form with more information about the entry in the grid view that was selected by clicking the button "Update". The form contains more fields and a button "Delete". When I click the button "Delete" I need to close the opened form and go back to the gridview and delete that entry. I'm using TemplateField to my gridview.
<asp:GridView ID="GridView1" runat="server">
<Columns>
<asp:TemplateField ShowHeader="False" HeaderText=" ">
<ItemTemplate>
<asp:Button ID="Btn_Update" Text="Update" runat="server" ButtonType="Button" CommandName="update" />
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField DataField="ID" HeaderText="ID" />
<asp:BoundField DataField="FirstName" HeaderText="First Name" />
<asp:BoundField DataField="LastName" HeaderText="Last Name" />
</Columns>
</asp:GridView>
This is the code after I click the button "Delete" in the form to close it and go back to the gridview:
protected void btn_Delete_Click(object sender, EventArgs e)
{
#region Redirect to Page
Page.ClientScript.RegisterStartupScript(this.GetType(), "RefreshParent", "<script language='javascript'>RefreshParent()</script>");
Response.Write("<script>window.close();</" + "script>");
#endregion
ClearData();
}
How can I delete the row from the gridview after clicking the button "Delete" in the form? Thank you all

Here's some sample code so you'd get the idea. It's WPF + C#, not web, but you should get the drift. The idea is the same.
Your main program:
public delegate void DeleteRow(bool doDelete);
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
int selectedRow = 0;
public DeleteRow deleteRowDelegate;
public void ReportDelete(bool delete)
{
// Delete the row here.
}
public MainWindow()
{
InitializeComponent();
deleteRowDelegate += new DeleteRow(ReportDelete);
}
private void btnOK_Click(object sender, RoutedEventArgs e)
{
// Here, get the row number to selectedRow.
SecondaryWin win = new SecondaryWin(deleteRowDelegate);
win.ShowDialog();
// At this point, if DELETE was clicked in your secondary window, code would have executed ReportDelete() method.
}
}
And this would be your secondary window:
public partial class SecondaryWin : Window
{
DeleteRow callbackDel;
public SecondaryWin(DeleteRow callback)
{
InitializeComponent();
callbackDel = callback;
}
private void btnDel_Click(object sender, RoutedEventArgs e)
{
callbackDel.Invoke(true);
// Close the window
}
}
So in your main you register the ReportDelete() method to the DeleteRow delegate, and then pass it into your secondary window. I've passed it in the constructor, but you could use a different method if you so wishes.
Then in my secondary window you could call that delegate when you click the DELETE button, and exit that window.
Back in Main(), whenever the DELETE is clicked in your secondary window it will execute the code inside your ReportDelete() method where you could delete that particular row. Use selectedRow for this purpose.

Telerik RadGrid how to display confirmation message

I have <telerik:RadGrid/>
inside this grid i have the following column contains button
<telerik:GridTemplateColumn >
<ItemTemplate>
<asp:Button ID="btnDelete" runat="server" Text="Delete"
CommandArgument='<%#Container.ItemIndex%>' OnCommand="btnDelete_Command">
protected void btnDelete_Command(object sender, CommandEventArgs e)
{
Telerik.Web.UI.GridDataItem item = gvAllDocuments.Items[int.Parse(e.CommandArgument.ToString())];
string FileName = item["documentFileName"].Text;
}
how I can add confirmation message before function btnDelete_Command executing ..

Do not use ItemIndex. It is just a row index of the grid. Instead, you want to set unique id inside DataKeyNames.
Ideally, you do not want to implement your own delete button, because telerik already has delete button which calls OnDeleteCommand automatically.
It is a prefer way of doing it for RadGrid.
<telerik:RadGrid ... OnDeleteCommand="RadGrid_DeleteCommand">
<MasterTableView DataKeyNames="xxxId" ...>
<Columns>
<telerik:GridButtonColumn
ButtonType="ImageButton"
ConfirmText="Are you sure you want to delete?"
CommandName="Delete"
ImageUrl="~/Images/Delete.png"
Text="Click to delete" UniqueName="Delete">
</telerik:GridButtonColumn>
</Columns>
...
</MasterTableView>
</telerik:RadGrid>
protected void RadGrid_DeleteCommand(object source, GridCommandEventArgs e)
{
int id = Convert.ToInt32(
e.Item.OwnerTableView.DataKeyValues[e.Item.ItemIndex]["xxxId"]);
// Delete logic here.
}

How to get value from TextBox in TemplateField when value change by javascript c# asp.net

script(update value)
$("#txtPlanDate").datepicker();
design page
<asp:TextBox ID="txtPlanDate" ReadOnly="true" runat="server" Text='<%# Bind("PlanDate", "{0:dd/MM/yyyy}") %>'></asp:TextBox>
code behind (get value)
protected void GridView1_OnRowUpdating(object sender, GridViewUpdateEventArgs e)
{TextBox txtPlanDate = (TextBox)GridView1.Rows[e.RowIndex].Cells[5].FindControl("txtPlanDate");}

I suppose you have textbox inside gridview templatefield . Then You need something like this
if (e.Row.RowType == DataControlRowType.DataRow)
{
TextBox txtPlanDate = (e.Row.FindControl("txtPlanDate") as TextBox);
}
It works OnRowDatabound event.Not tested OnRoUpdating event but it should work fine.

How do I get DropDownList selected value from user in Asp.Net(selectedIndexChange)

How do I go about getting the selected value from the DropDownList in asp.Net using selectedIndexChanged with an update Panel? I've tried but when I add the AutoPostBack to my DropDownList, it sends me to an error page saying it cannot find the resource.(doesn't even hit my "selected_IndexChanged") I have the hiddenField being assigned the selected value.
Here is my DropDownList:
<asp:ScriptManager ID="ScriptManager1" runat="server" />
<asp:UpdatePanel runat="server" ID="UpdatePanel1">
<ContentTemplate>
<asp:DropDownList runat="server" ID="ddlCaseFilesNew" DataSourceID="dsCaseFiles"
DataTextField="Display" DataValueField="FileID" OnPreRender="ddl_PreRender" Width="300px"
AutoPostBack="true" OnSelectedIndexChanged="ddlCaseFilesNew_SelectedIndexChanged" Visible="False">
<asp:ListItem>Item 1</asp:ListItem>
</asp:DropDownList>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="ddlCaseFilesNew" EventName="SelectedIndexChanged" />
</Triggers>
</asp:UpdatePanel>
When I click on a value inside the DropDownList it sends me to a "cannot find resource" page. I have no idea why. It doesn't even touch my "onSelectedIndexChanged"
<script runat="server">
protected void ddlCaseFilesNew_SelectedIndexChanged(object sender, EventArgs e)
{
hidNewCaseFile.Value = ddlCaseFilesNew.SelectedItem.Value;
}
</script>

In your SelectedIndex function, use
string sValue = ((DropDownList)sender).SelectedValue;
Since it's in an update panel, you likely won't have access to it via the designer (this.DdlId).
Based on your comment in the OP, this is likely what you need:
protected void ddlCaseFilesNew_SelectedIndexChanged(object sender, EventArgs e)
{
hidNewCaseFile.Value = ((DropDownList)sender).SelectedValue;
}
You also need to move your hidden field into the ContentTemplate.

Use:
protected void myDropDownList_SelectedIndexChanged(object sender, EventArgs e)
{
var res = this.myDropDownList.SelectedValue;
}
Or:
protected void myDropDownList_SelectedIndexChanged(object sender, EventArgs e)
{
var ddl = sender as DropDownList;
var res = ddl.SelectedValue;
}
Edit 1
You need to understand that the partial page rendering occurs for all controls inside an UpdatePanel, in your case, you are trying to set the Value property of hidNewCaseFile control which does not appear to be inside the UpdatePanel therefore, its value will never get updated