Web Forms :: Updating Bound Column When DropDownList?
May 17, 2010
I have a DataGrid with a TemplateColumn containing an asp:DropDownList and a BoundColumn. I'd like to have a VB.NET handler for when the selected item in the DropDownList changes. I'd like this handler to also update the value in the BoundColumn with the value of the newly selected item in the DropDownList.
Can someone point me to some resources I can examine to learn how to do this?
If the handler for the selection changing can give me the value of the NEWLY selected item, it should just be a matter of accessing the cell for my BoundColumn in the same row and writing to it. I do not know the syntax to achieve this.
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Feb 23, 2010
I really hope I'm missing something, but I cannot for the life of me figure out a simple way to do the following: I have a database with a list of Ids, Names, and a bit field representing a boolean. Example:
Id | Name | Active
21 BoB 1
43 Ron 0
23 Tom 1
All I want is to list the names on my webpage, with check boxes beside them, and when I click the checkbox the database automatically changes the status... that's it. A checkedlistbox control would be amazing, but it doesn't seem to exist in web form. The problem with checkboxes is asp:checkbox doesn't have a "value" field anymore. So when I'm handling CheckedChanged event, I have no way of knowing what the Id of the changed entry is. I have seen a couple things online that require searching through control hierarchies to find some Id somewhere in your dataset, but that does not make sense.There MUST be a way to do something like this:
[Code]....
At this point I think it's easier to use 2 list boxes, 1 that lists people where Active=0 and one that lists people where Active=1 and then an OnSelect event that moves them between each other. That's how easy checkboxes SHOULD be.
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Feb 18, 2011
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Feb 15, 2010
I have a gridview which contains a dropdownlist inside a TemplateField. The ddl appears correctly and seems to work ok but it isn't updating the table despite being bound to a field.
[Code]....
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Mar 25, 2010
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[Code]....
[Code]....
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Aug 18, 2010
have a GridView, with the following column:
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Jun 30, 2010
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code
protected void UpdateButton_Click(object sender, EventArgs e) { originalDataTable = (DataTable)ViewState["originalValuesDataTable"]; foreach (GridViewRow r in GridView_ABC.Rows) if (IsRowModified(r)) { GridView_ABC.UpdateRow(r.RowIndex, false); } // Rebind the Grid to repopulate the original values table. tableCopied = false; GridView_ABC.DataBind(); }
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Oct 5, 2010
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<asp:BoundField DataField="WorkPreference" HeaderText="WorkPreference"
HeaderStyle-HorizontalAlign="Left">
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May 17, 2010
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Apr 25, 2010
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[Code]....
[Code]....
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Imports System.Data.SqlClient
Imports System.Data
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Inherits System.Web.UI.Page
ProtectedSub Page_Load(ByVal senderAsObject,ByVal eAs System.EventArgs)HandlesMe.Load
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Dim col1AsNew DataColumn
[code]...
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May 14, 2010
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Nov 25, 2010
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Jan 24, 2010
I have a situation where I currently have a HyperLinkColumn control that I would like to modify to have a Label or simple text appear in the same column as the hyperlink. I tried setting this in the ItemCreated event but encountered the following error message
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Jul 8, 2010
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Mar 29, 2011
I have a table and 7 column name.
I bind the 7 column name in one dropdownlist.
Now the problem is,how do I extract the data value in a dropdownlist?
For example,
Dropdownlist contain 7 column name
-subject_name
-subject_code
-venue
-time
-seat_no
-admission_no
-subject_id
when I click the subject_name,I want it to appear in a gridview
Example
Math|9.00-10.00|Hall|18|09090J|...
Below is my current codes which I have a problem.
protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
SqlConnection conn = new SqlConnection("Data Source= EN\SQLEXPRESS;" + "Initial Catalog=ms;Integrated Security=SSPI");
SqlDataAdapter adapSel;
string mySQL = "SELECT '" + dd_list.SelectedValue+ "' FROM examtimetable ";
adapSel = new SqlDataAdapter(mySQL, conn);
conn.Open();
DataSet dsSel = new DataSet();
adapSel.Fill(dsSel);
GridView1.DataSource = dsSel;
GridView1.DataBind();
conn.Close();
}
Previously I have bind 7 column name in my dropdownlist
protected void Page_Load(object sender, EventArgs e)
{
if (Page.IsPostBack == false)
{
SqlConnection conn = new SqlConnection("Data Source= EN\SQLEXPRESS;" + "Initial Catalog=ms;Integrated Security=SSPI");
SqlCommand sqlCmd = new SqlCommand("select column_name from information_schema.columns where table_name='examtimetable' and COLUMN_NAME not like '%ID'", conn);
conn.Open();
SqlDataReader ds;
ds = sqlCmd.ExecuteReader();
dd_list.Items.Clear();
dd_list.DataSource = ds;
dd_list.DataTextField = "Column_Name";
dd_list.DataValueField = "Column_Name";
dd_list.DataBind();
dd_list.Items.Insert(0, "Select Option");
ds.Close();
conn.Close();
}
}
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Aug 26, 2010
I have a series of dropdownlists on webform in ASP 4.0. The first drop down is filled upon load, and then when a user selects a value from that list, it populates the second dropdown. To accomplish this, I have a SQLdatasource with a parametersource of the first drop-down list control. This works great, except when a user changes their selection from the first drop down. It performs the query, but then adds the list of items to the ones that were already there from the previous selection, instead of replacing it with the new data. Here is the code:
[Code]....
Do I need to do something on selectedindexchanged to somehow "clear out" the previous datasource? I can't find anything about this online, although one person seemed to suggest it was related to using a master page. (which I am using).
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Aug 11, 2010
I have an ASP.NET GridView control in a Web Form. For the sake of simplicity, I will say that this GridView is defined as follows:
[code]...
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Oct 12, 2010
In my web page I show loading image with dim background. Dropdown list is not bound inside the dim background .In IE only I experience this problem.
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Aug 23, 2011
I have a dgv with a column type = DataGridViewAutoFilterCheckBoxColumn. I want to know if there's a way to I can get that entire column to become disabled (or Enabled = False) so it won't let the user click on the checkboxes.
I tried looking in the "Bound Column Properties" but there isn't an option to disable the entire column.
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Mar 3, 2011
I have a Dropdownlist in my form as an example as below.
The Dropdownlist items are pulled out from the database table.
When a user Clicks 'Save Template', A new row is created in the database, BUT the dropdownlist items
remains the same :( I want the list to be dynamic so that the user doesn't have to press F5 for updating the list.
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Jan 17, 2011
I'm trying to populate a date from a bound text field in a DetailsView. I keep getting a error when a DBNull is in the column. How do I avoid the DBNull when populating the text field.My code is as follows:
<asp:TemplateField HeaderText="CBYD Clear Date">
<EditItemTemplate>
<asp:TextBox ID="CBYDExpDate" runat="server" ReadOnly="true" Text='<%# IIf(Eval("CBYDDate") is DBNull.Value,"", String.Format("{0:MM/dd/yyyy}", Eval("CBYDDate").AddDays(30)))%>' />
</EditItemTemplate>
</asp:TemplateField>
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