Develop Reference

How to call a function when drop down list in gridview is changed?

I have a GridView and for one of the columns I'm using a drop down list that displays a list of users:
<asp:GridView style="float:left"
ID="gvBookings"
ShowHeaderWhenEmpty="true"
CssClass="tblResults"
runat="server"
OnRowDataBound="gvBookings_RowDataBound"
DataKeyField="ID"
AutoGenerateColumns="false"
allowpaging="false"
<Columns>
<asp:BoundField DataField="FinishDate" HeaderText="Finish Date"></asp:BoundField>
<asp:TemplateField HeaderText="Time Spent By">
<ItemTemplate>
<asp:DropDownList id="ddlUsers" runat="server" ></asp:DropDownList>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
In the code behind I need to call a function that updates the database when the drop down list is changed. I have done this already for the FinishDate column so is there a similar way to do this for the drop down menu?
Code behind:
protected void gvBookings_RowDataBound(object sender, GridViewRowEventArgs e)
{
BHTaskClass.BookingTask booking = (BHTaskClass.BookingTask)e.Row.DataItem;
if (e.Row.RowType == DataControlRowType.DataRow)
{
foreach (TableCell c in e.Row.Cells)
{
if (count == 1)
{
string FinishTime = booking.FinishTime.HasValue ? booking.FinishTime.Value.ToString("hh':'mm") : "";
c.Text = "<input type=\"text\" id=\"txtFinishTime" + booking.ID + "\" style=\"width:70px\" type=\"text\" onblur=\"UpdateFinishTime(" + booking.ID + ",this.value)\" value=\"" + FinishTime + "\" >";
}
if (count == 2)
{
ddlUsers.SelectedValue = booking.TimeSpentName;
}
count++;
}
}
}
So when the FinishDate textbox is changed it calls the UpdateFinishTime function and this updates the database. How do I call a function for the drop down list?

ASPX
<asp:DropDownList id="ddlUsers" runat="server"
AutoPostBack="true"
OnSelectedIndexChanged="YourFunction_Changed">
</asp:DropDownList>
Code behind:
protected void YourFunction_Changed(object sender, EventArgs e)
{
//do stuff...
}

To get the Row ID you can do it as below
protected void YourFunction_Changed(object sender, EventArgs e)
{
//do stuff...
int Index = ((GridViewRow)((sender as Control)).NamingContainer).RowIndex;
// your logic follows based on the Index
}

How to redirect to another page from gridview edit event

I don't know am I using good approach.
I have a view page with gridview and edit page.
In gridview I have added:
...
<Columns>
<asp:CommandField ShowEditButton="True" ShowDeleteButton="true"></asp:CommandField>
...
And event:
OnRowEditing="rgrContact_RowEditing"
In event method I have tried to add:
protected void rgrContact_RowEditing(object sender, GridViewEditEventArgs e)
{
var id = (int)rgrContact.DataKeys[e.RowIndex].Value;
Response.Redirect("..." + id);
But there is no e.RowIndex.
How to get ID of the selected row so I can pass it to edit page?
Am I using good event?

try this:
NewEditIndex returns index of row on which you click for Edit
protected void rgrContact_RowEditing(object sender, GridViewEditEventArgs e)
{
var id = (int)rgrContact.DataKeys[e.NewEditIndex].Value;
Response.Redirect("MyEditPage.aspx?MyID=" + id);
EDIT:
DataKeyNames="DataKey1,DataKey2"
You can Use Like this
string DataKey1= rgrContact.DataKeys[e.NewEditIndex].Values[0].ToString();
string DataKey2= rgrContact.DataKeys[e.NewEditIndex].Values[1].ToString();
OR
rgrContact.DataKeys[e.NewEditIndex].Values["DataKey1"];
rgrContact.DataKeys[e.NewEditIndex].Values["DataKey2"];
As Others said No Need to Use what you said
another solution :
<ItemTemplate>
<asp:HyperLink ID="hyper" Text="this is link"
NavigateUrl= '<%# String.Format("{0}","MYpage.aspx?id=" + Eval("MY_ID_COL")) %>' runat="server" />
</ItemTemplate>

Generated ASP table add buttons that pull row values

ok so I have this ASP:Table which pulls its rows of info from a stored procedure query, only two columns but wish to add a third with a button for each row that when clicked will grab the information in the prior columns for use in another function.
not sure how the hell to code it though as the buttons are generated per row and how can I programme events for a unknown number of buttons there must be a way of doing It programmatically.
Table Header
Datacolumn1 Datacolumn2
a 2 Select
b 4 Select
e 9 Select
so when I press select on the second row it gives me string1=b string2=4
I imagine the code would look something like this (not likely but in a ideal world :D)
protected void select_row (eventargs as e)
{
string data1 = Row(e).cell(0).text
int data2 = Row(e).cell(1).text
}

For a grid like this
<asp:GridView ID="Grid1" runat="server" onrowcommand="Grid1_RowCommand" AutoGenerateColumns="false">
<Columns>
<asp:BoundField DataField="Datacolumn1" HeaderText="Data column1" />
<asp:BoundField DataField="Datacolumn2" HeaderText="Data column2" />
<asp:TemplateField>
<ItemTemplate>
<asp:Button runat="server" CommandName="SelectIt" Text="Select" CommandArgument='<%# Eval("Datacolumn1") %>' />
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
Use RowCommand event
protected void Grid1_RowCommand(object sender, GridViewCommandEventArgs e)
{
var btn = (Button)e.CommandSource ;
if (e.CommandName == "SelectIt")
{
var Row =(GridViewRow) btn.NamingContainer;
var Datacolumn1 = Row.Cells[0].Text;
var Datacolumn2 = Row.Cells[1].Text;
btn.Text = "selected: " + Datacolumn1 + "," + Datacolumn2;
}
}

Add text from c# code to a gridview label

I need to add an specific text in an itemtemplate on a gridview...
right now I have this in my gridview
<asp:TemplateField HeaderText="Total" SortExpression="Total" ItemStyle-Width="100px">
<ItemTemplate>
<asp:Label ID="lblTotal" runat="server" Text='<%#Math.Round(Convert.ToDouble(Eval("Total")), 2).ToString("C") + " M.N."%>'>
</asp:Label>
</ItemTemplate>
</asp:TemplateField>
in the part where it says
<asp:Label ID="lblTotal" runat="server" Text='<%#Math.Round(Convert.ToDouble(Eval("Total")), 2).ToString("C") + " M.N."%>'>
I made an specific text, but it will always be the same text (well except in the Eval of course)... But I need to get the format I need from this method.
public static string GetFormatoMoneda(decimal decCantidad)
{
//Get data from currency (Dollars, Pesos, Euros, etc.)
DataRow dr = ConexionBD.GetInstanciaConexionBD().GetTipoDeMonedaPrincipal((int)HttpContext.Current.Session["Grupo"]);
return dr["Signo"] + Math.Round(decCantidad, 2).ToString("C").Substring(1) + " " + dr["Abreviatura"];
}
I use this method to get a specific string and use it on labels (I assign it on code on the cs file)..
But in this case... I have to insert that text on the column of a gridview...
How can I get that string value and insert it on a label inside of a templatefield/itemtemplate??

Instead of ...
Text='<%#Math.Round(Convert.ToDouble(Eval("Total")), 2).ToString("C") + " M.N."%>'
...use
Text='<%#GetFormatoMoneda(Eval("Total"))%>'
However, this assumes that GetFormatoMoneda is in the same class as the web form. If not, then you need to include the class name, e.g.
Text='<%#MyClass.GetFormatoMoneda(Eval("Total"))%>'
Then you either need to make a change to GetFormatoMoneda to use an object type parameter, e.g.
public static string GetFormatoMoneda(object objCantidad)
{
var decCantidad = Convert.ToDecimal(decCantidad);
//Get data from currency (Dollars, Pesos, Euros, etc.)
DataRow dr = ConexionBD.GetInstanciaConexionBD().GetTipoDeMonedaPrincipal((int)HttpContext.Current.Session["Grupo"]);
return dr["Signo"] + Math.Round(decCantidad, 2).ToString("C").Substring(1) + " " + dr["Abreviatura"];
}
or use another method with an object parameter and call GetFormatoMoneda(decimal), passing in the correct value, such as
protected string CorrectFormat(object obj)
{
return GetFormatoMoneda(Convert.ToDecimal(obj));
}
in which case you would use
Text='<%#CorrectFormat(Eval("Total"))%>'

If you wanted to do it programmatically, this would work:
Default.aspx:
<asp:GridView ID="gvGrid" runat="server" AutoGenerateColumns="false" OnRowDataBound="gvGrid_RowDataBound">
<Columns>
<asp:TemplateField>
<ItemTemplate>
<asp:Label ID="lblTotal" runat="server" />
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
Default.aspx.cs:
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
//Generate fake data
var data = Enumerable.Range(1, 20);
//Give the data to the grid
gvGrid.DataSource = data;
gvGrid.DataBind();
}
}
protected void gvGrid_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
//Find the control
var lblTotal = (Label)e.Row.FindControl("lblTotal");
//Get the data for this row
var data = (int)e.Row.DataItem;
//Display the data
lblTotal.Text = data.ToString();
}
}

firing problem of selected_indexchanged(cant even print cell value in grid view by any event)

//code in aspx.
<Columns>
<asp:BoundField DataField="Name" HeaderText="Name" />
<asp:BoundField DataField="City" HeaderText="City" />
<asp:BoundField DataField="MobilePhone"
HeaderText="Mobile Phone" />
<asp:ButtonField Text="Button" ButtonType="Button" CommandName="Select" />
</Columns>
</asp:GridView>
<asp:Label ID="Label" runat="server" Text="Label"></asp:Label>
//code behind file()
protected void grid_SelectedIndexChanged(object sender,
EventArgs e)
{
int selectedRowIndex;
selectedRowIndex = grid.SelectedIndex;
GridViewRow row = grid.Rows[selectedRowIndex];
string name = row.Cells[0].Text;
Label.Text = "You selected " + name + ".";
}
Q: iam not even able to print the selected row.If anyone could help me with this issue.

You should really be getting this value from the underlying data item. But, if for some reason that value is being manipulated after it has been data-bound and you need to get the actual value of the control in that cell then you probably want something like this:
protected void grid_SelectedIndexChanged(object sender, EventArgs e)
{
GridViewRow row = (GridViewRow)grid.Rows[grid.SelectedIndex];
string name = ((Label)row.Cells[1].Controls[1]).Text;
Label.Text = "You selected " + name + ".";
}
but... that's a pretty messy way of achieving this. Also "Label" is a pretty bad name for a label. Also, Cell[0] like you posted is going to be the column with the select button most likely, not the column with the value you want. And, once you're in the correct cell, there are 3 controls, 2 literals and a label for a normal boundfield. Control[1], the second control, is the label control that will have the value you're looking for.

You have to use a RowCommand Event instead of a SelectedIndexChanged Event.
protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)
{
if (e.CommandName == "Select")
{
GridViewRow row = ((GridViewRow)((Button)e.CommandSource).NamingContainer);
string name = row.Cells[0].Text;
Label.Text = "You selected " + name + ".";
}
}