I'm having trouble with a DropDownList within a GridView that posts a NULL value when in fact a value is selected from the list when using inline editing.
The problem is that I can't use this method to bind the value to the UpdateCommand in my SqlDataSource:
SelectedValue='<%# Bind("Value") %>'
The reason for this is because the value might not exist in the list so it throws an exception.
Is there a way I can bind the value to the UpdateCommand without using SelectedValue?
Thanks in advanced.
You may use RowDataBound to set SelectedValue;
in .cs file
protected void Grid_RowDataBound(object sender, GridViewRowEventArgs e)
{
GridView grid = (GridView)sender;
DropDownList DropDownList1 = (e.Row.FindControl("DropDownList1") as DropDownList);
HiddenField HiddenField1 = (e.Row.FindControl("HiddenField1") as HiddenField);
DropDownList1.SelectedValue = HiddenField1.Value;
}
in .aspx file;
<Columns>
...
<asp:TemplateField HeaderText="Column Name">
<ItemTemplate>
<asp:Label ID="Label1" runat="server" Text='<%# Bind("Value") %>'></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:HiddenField ID="HiddenField1" runat="server" Value='<%# Bind("Value") %>'></asp:HiddenField>
<asp:DropDownList ID="DropDownList1" runat="server">
...
</asp:DropDownList>
</EditItemTemplate>
</asp:TemplateField>
</Columns>
Related
I am using DataGrid in Asp.net
<asp:DataGrid>
<Columns>
<asp:TemplateColumn>
<ItemTemplate>
<asp:CheckBox ID="chkDetail" runat="server" OnCheckedChanged="chkDetail_CheckedChanged" />
</ItemTemplate>
</asp:TemplateColumn>
<asp:TemplateColumn HeaderText="Name" HeaderStyle-Font-Bold="true" HeaderStyle-HorizontalAlign="Center">
<EditItemTemplate>
<asp:TextBox runat="server" Text='<%# DataBinder.Eval(Container, "DataItem.Name") %>'></asp:TextBox>
</EditItemTemplate>
<ItemTemplate>
<asp:Label runat="server" Text='<%# DataBinder.Eval(Container, "DataItem.Name") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateColumn>
</Columns>
</asp:DataGrid>
As you can see, there is a Checkbox inside DataGrid.
Everytime I check in checkbox, I would like to fire 2 events
1. Other checkboxes will be unselected (I can do it with JS - so it's ok)
2. Context will store DataGrid Name field like this
protected void chkDetail_CheckedChanged(object sender, EventArgs e)
{
Context["Name"] = ??;
}
Because DataGrid doesn't have "Rows" like GridView, I have no idea how to get the Name from the same row.
Thanks in advance.
DataGridViewRow dgvrows = TrGrid.SelectedRows;
string c = dgvrows.Cells("Late_Time").value.toString();
OR
DataGridViewRow dgvrow = this.dataGridView1.Rows[index];
DataRowView drvrow = (DataRowView)dgvrow.DataBoundItem;
You can try this code
protected void chkDetail_CheckedChanged(object sender, EventArgs e)
{
Context["Name"] = (((sender as CheckBox).NamingContainer as DataGridItem).FindControl("label_id") as Label).Text;
}
Your sender will be a CheckBox as the event is triggered by it.
Every control will have a property called NamingContainer which gives the nearest server control that inherits INamingContainer interface. In your case it is DataGridItem. And you can use FindControl method to find child control and cast it to appropriate control type to access its properties.
I have a Gridview with a column that has a DropDownList.
I've binded this Dropdownlist with an event on the "SelectedIndexChanged".
The problem is i can't get the value of a label of another column in the same row.
The code is the next:
protected void grid_OnSelectedIndexChanged(object sender, EventArgs e)
{
grdCredenciales.DataBind();
var dropdown = (DropDownList)sender;
var row = (GridViewRow)dropdown.NamingContainer;
var label = (Label)row.FindControl("lblMatricula");
var value = label.Text; // I get "" in this line.
}
And in the grid i have:
<asp:ObjectDataSource ID="CredencialesDS" runat="server" />
<asp:GridView ID="grdCredenciales" runat="server" BackColor="White" DataSourceID="CredencialesDS"
CssClass="DDGridView" RowStyle-CssClass="td" HeaderStyle-CssClass="th" CellPadding="6" AllowSorting="True"
AllowPaging="True" AutoGenerateColumns="False" PageSize="10" OnRowDataBound="grdCredenciales_OnRowDataBound">
<Columns>
<asp:TemplateField>
<HeaderTemplate>
<asp:Label ID="Label7" ToolTip="Matrícula" runat="server" Text="Matrícula"/>
</HeaderTemplate>
<HeaderStyle HorizontalAlign="Left" Width="15%"/>
<ItemStyle HorizontalAlign="Left" />
<ItemTemplate>
<asp:Label ID="lblMatricula" runat="server"><%# Eval("Matricula") %></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField>
<HeaderTemplate>
<asp:Label ID="Label19" ToolTip="Estado" runat="server" Text="Estado" />
</HeaderTemplate>
<HeaderStyle HorizontalAlign="Left" Width="15%"/>
<ItemStyle HorizontalAlign="Left" />
<ItemTemplate>
<asp:DropDownList runat="server" ID="dpEstadoCredencial" AutoPostBack="True" OnSelectedIndexChanged="grid_OnSelectedIndexChanged" CssClass="comboEstado"/>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
I don't know why, but label.text returns an empty string. As you can see, i am calling the DataBind before, so the label should have a value at this point.
Do you know how can i get the value i need from the label in another column?
Thanks for everyone.
Check the GridView's DataSource before you do the DataBind(). Since you're missing the full ASPX markup, I'm not sure if you're setting the data source programmatically or with a SqlDataSource.
In any case, what will happen often with programmatically-set Data Sources is that they disappear on a PostBack, and when you call that DataBind, you're really DataBinding it to null, which would explain why you're getting string.Empty ("") for the Label's Text property.
Just verified the code provided by you. It's working completely.
Please make sure in the RowDataBound event of Grid View, you reattach the dropdownlist's SelectedIndexChanged event as below:
protected void CustomersGridView_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (Page.IsPostBack)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
DropDownList ddl = e.Row.FindControl("dropdown1") as DropDownList;
if (ddl != null)
{
ddl.SelectedIndexChanged += new EventHandler(CustomersGridView_SelectedIndexChanged);
}
}
}
}
Also, I used the same code as yours in SelectedIndexChanged event. I'm putting here my aspx Markup:
<asp:gridview id="CustomersGridView"
datasourceid="CustomersSqlDataSource"
autogeneratecolumns="false"
runat="server"
OnRowDataBound="CustomersGridView_RowDataBound">
<Columns>
<asp:TemplateField>
<ItemTemplate>
<asp:Label runat="server" ID="Label2" Text='<%# Bind("ID") %>' />
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField>
<ItemTemplate>
<asp:DropDownList ID="dropdown1" runat="server" AutoPostBack="true" OnSelectedIndexChanged="dropdown1_SelectedIndexChanged">
<asp:ListItem Text="Cat"></asp:ListItem>
<asp:ListItem Text="dog"></asp:ListItem>
<asp:ListItem Text="Mouse"></asp:ListItem>
<asp:ListItem Text="pig"></asp:ListItem>
<asp:ListItem Text="snake"></asp:ListItem>
</asp:DropDownList>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:gridview>
Please provide your GridView markup too for checking.
I have a GridView that is made up of two database fields populated via a stored procedure and then three fields for user input (two checkbox controls and one textbox) when I click on the save button I can get the information from the three controls but nothing from the two that were populated via the database. How can I get the first two fields?
<asp:GridView ID="gvA1" runat="server" AutoGenerateColumns="false" DataKeyNames="CodeNo" AutoGenerateSelectButton="false" EnablePersistedSelection="True" Visible="false">
<Columns>
<asp:TemplateField Visible="false" >
<ItemTemplate>
<%#DataBinder.Eval(Container.DataItem, "CodeNo")%>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField ItemStyle-Wrap="true" ItemStyle-Width="400px" HeaderText="Violation">
<ItemTemplate>
<%#DataBinder.Eval(Container.DataItem, "CodeViolationCited") %>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField>
<ItemTemplate>
<asp:CheckBox ID="A1Accordion_cbPool" runat="server" Text="Pool:" />
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField>
<ItemTemplate>
<asp:CheckBox ID="A1Accordion_cbSpa" runat="server" Text="Spa:" />
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Additional Comments" Visible="true">
<ItemTemplate>
<asp:TextBox ID="A1Accordion_tb" runat="server" TextMode="MultiLine"></asp:TextBox>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
Code Behind:
protected void SaveAndCollapseA1(object sender, EventArgs e)
{
//good stuff
CheckBox myCheckBox_1 = gvA1.Rows[0].FindControl("A1Accordion_cbPool") as CheckBox;
CheckBox myCheckBox_2 = gvA1.Rows[0].FindControl("A1Accordion_cbSpa") as CheckBox;
TextBox myTextBox = gvA1.Rows[0].FindControl("A1Accordion_tb") as TextBox;
//not so good stuff
String myString1 = gvA1.Rows[0].Cells[0].ToString();
String myString2 = gvA1.Rows[0].Cells[1].ToString();
}
I figured it out but I haven't been hear long enough to post the solution via the links but if you change the columns as so:
<asp:label ID="lblA1CodeNo" runat="server" text='<%# Eval("CodeNo") %>'></asp:label>
then the values are available...
Try:
<%# Bind("CodeViolationCited") %>
Instead of
<%#DataBinder.Eval(Container.DataItem, "CodeViolationCited") %>
Eval is one way, bind is two-way.
See Microsoft's documentation for data-binding expressions
<InsertItemTemplate>
<asp:TextBox ID="TextBox1" runat="server" Text='<%# Bind("ProductId") %>'>
</asp:TextBox>
</InsertItemTemplate>
How do I pass a value to the Bind("ProductId")? More specifically:
Request.QueryString["ProductId"]
EDIT:
leave it with your original bind but add OnDataBinding
<asp:TextBox ID="TextBox1" runat="server" Text='<%# Bind("ProductId") %>'
OnDataBinding = "TextBox1_OnDataBinding"></asp:TextBox>
and
protected void TextBox1_OnDataBinding(object sender, EventArgs e)
{
(sender as TextBox).Text = Request.QueryString["ProductId"];
}
In addition to
<asp:TextBox ID="TextBox1" runat="server" Text='<%#Request.QueryString["ProductID"]%>' />
You need to handle the OnInserting event of your datasource and set the value there with the querystring parameter.
You will have to explicitly set the TextBox value in the DataBound event of your DataBoundControl (repeater/gv etc).
I have a field in a details view shown below
<asp:BoundField DataField="DTMON_F" HeaderText="Monday Hours From: " InsertVisible="False"
ReadOnly="True" SortExpression="HOURS" Visible="false" />
<asp:TemplateField HeaderText="Monday Hours From: " SortExpression="HOURS">
<EditItemTemplate>
<uc1:TimePicker ID="tpMondayHours" runat="server"/>
</EditItemTemplate>
<InsertItemTemplate>
<%-- <uc1:TimePicker runat="server" ID="tpMondayHours" />--%>
<asp:TextBox ID="txtMondayHours" runat="server" Text='<%# Bind("DTMON_F") %>'></asp:TextBox>
</InsertItemTemplate>
<ItemTemplate>
<asp:Label ID="lblMondayHours" runat="server" Text='<%# Bind("DTMON_F") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
Before "DTMON_F" is binded to the view I want to cut the string that is returned...Where and how might I do this?
You can implement the OnDataBinding event for each control instead of doing the bind inline. This will give you the ability to do whatever you like with the data before assigning it to the control.
Example using your Label. The same could be applied to the TextBox:
<asp:Label ID="lblMondayHours" runat="server"
OnDataBinding="lblMondayHours_DataBinding"></asp:Label>
protected void lblMondayHours_DataBinding(object sender, System.EventArgs e)
{
Label lbl = (Label)(sender);
string yourValue = (int)(Eval("DTMON_F"));
// *** Do whatever you want with the value now
lbl.Text = yourValue;
}