I have an edit page where I set the selected index of a radcombobox (rcb_ParentCompany) based on a value returned from the database. However on postback the text in the combobox keeps changing to the top item in the dataset. Any ideas why?
protected void Page_Load(object sender, EventArgs e)
{
if (IsPostBack)
{
BindOperatingNameComboBox(rcb_OperatingName);
BindParentCompanyComboBox(rcb_ParentCompany);
}
}
protected void btn_Edit_Command(object sender, CommandEventArgs e)
{
Client ClientToEdit = ClientController.ViewClient(int.Parse(e.CommandArgument.ToString()));
//Populate Client fields
txt_ClientName.Text = ClientToEdit.ClientName;
rcb_OperatingName.Text = ClientToEdit.OperatingName;
int ParentCompanyIndex = rcb_ParentCompany.FindItemIndexByValue(ClientToEdit.ParentCompanyID.ToString());
rcb_ParentCompany.SelectedIndex = ParentCompanyIndex;
txt_Address1.Text = ClientToEdit.Address1;
txt_Address2.Text = ClientToEdit.Address2;
txt_Country.Text = ClientToEdit.Country;
txt_Region.Text = ClientToEdit.Region;
txt_City.Text = ClientToEdit.City;
txt_PostalCode.Text = ClientToEdit.PostalCode;
txt_ClientNote.Text = ClientToEdit.ClientNote;
tbl_EditServices.Controls.Clear();
PopulateEditClientPanel(ClientToEdit);
btn_SaveChanges.CommandArgument = e.CommandArgument.ToString();
btn_Cancel.CommandArgument = e.CommandArgument.ToString();
}
protected void BindParentCompanyComboBox(RadComboBox ComboBox)
{
DataTable OperatingNames = ClientController.GetExistingClientAndOperatingNames("");
ComboBox.DataTextField = "ClientName";
ComboBox.DataValueField = "ClientID";
ComboBox.DataSource = OperatingNames;
ComboBox.DataBind();
}
protected void rcb_ParentCompany_ItemsRequested(object sender, RadComboBoxItemsRequestedEventArgs e)
{
BindParentCompanyComboBox((sender as RadComboBox));
}
Any ideas why?
Yes, because you are doing if(IsPostBack) as opposed to if(!IsPostBack)
Related
So I have a sipme ASP.NET Web Page that prints the info of one's gender stacked dynamically in a radio button list:
protected void Page_Load(object sender, EventArgs e)
{
String[] genders = new String[2];
genders[0] = "Male";
genders[1] = "Female";
RadioButtonList1.DataSource = genders;
RadioButtonList1.DataBind();
RadioButtonList1.Items.Add(new ListItem("Neutral", "Zero"));
}
protected void Button1_Click(object sender, EventArgs e)
{
lblName.Text = txtName.Text;
lblSurname.Text = txtSurname.Text;
lblEmail.Text = txtMail.Text;
Panel1.Visible = true;
if (RadioButtonList1.SelectedIndex==0) lblGender.Text = "Male";
else lblGender.Text = "Female";
}
However when I launch the site no matter what I select it always writes female it's like the RadioButtonList1.SelectedIndex==0 isn't working.
Any ideas?
Bind radiobuttonlist in page_Load with !IsPostBack condition or your radiobuttonlist will bind every time you post your page. So your radiobuttonlist is reset to index -1 when you click the button_click.
protected void Page_Load(object sender, EventArgs e)
{
if(!IsPostBack)
{
String[] genders = new String[2];
genders[0] = "Male";
genders[1] = "Female";
RadioButtonList1.DataSource = genders;
RadioButtonList1.DataBind();
RadioButtonList1.Items.Add(new ListItem("Neutral", "Zero"));
}
}
I'm using DevExpress 2012 Vol 2.4 ASP.NET WebForms controls. I've created a new object of XtraReport class and subscribed to its HtmlItemCreated event. When I'm calling the ExportToHtml method of the XtraReport object the event is not getting raised.
I've not posted the markup but there is just a button. When I click the button the event is not triggered. I've put a breakpoint and tested that.
public partial class WebForm1 : System.Web.UI.Page
{
XtraReport rep = null;
protected void Page_Load(object sender, EventArgs e)
{
rep = new XtraReport();
rep.CreateDocument();
rep.HtmlItemCreated += rep_HtmlItemCreated;
PageHeaderBand h = new PageHeaderBand();
XRLabel l = new XRLabel();
l.Text = "asdasd";
h.Controls.Add(l);
rep.Bands.Add(h);
}
protected void rep_HtmlItemCreated(object sender, HtmlEventArgs e)
{
if (e.ScriptContainer != null)
{
string x = "asdasd";
}
}
protected void btnTest_Click(object sender, EventArgs e)
{
string sPDFFilePath = System.IO.Path.GetTempPath() + "Test.html";
HtmlExportOptions objPDFExpOpt = rep.ExportOptions.Html;
objPDFExpOpt.EmbedImagesInHTML = true;
objPDFExpOpt.ExportMode = HtmlExportMode.DifferentFiles;
if (!string.IsNullOrEmpty("Test"))
objPDFExpOpt.Title = "Test";
rep.ExportToHtml(sPDFFilePath, objPDFExpOpt);
}
}
Can anyone tell me what I'm doing wrong?
//--- menuFac ---
public void UpdatePageById()
{
db.ModifyData("UPDATE tblsider SET colOverskrift=#1, colTekst=#2 WHERE colID=#3", _overskrift, _tekst, _id);
}
//--- where i'm trying to get some from db to edit and save the edited ---
menuFac objTekst = new menuFac();
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
objTekst._id = int.Parse(Request.QueryString["colID"]);
DataRow value = objTekst.GetPageById();
txtOverskrift.Text = value["colOverskrift"].ToString();
txtTekst.Text = value["colTekst"].ToString();
}
}
protected void btnSubmit_Click(object sender, EventArgs e)
{
objTekst._id = int.Parse(Request.QueryString["colID"]);
objTekst._overskrift = txtOverskrift.Text;
objTekst._tekst = txtTekst.Text;
objTekst.UpdatePageById();
Response.Redirect("Protected.aspx");
}
Replace this call method
objTekst.UpdatePageById();
with
this.UpdatePageById();
UpdatePageById is method of your Page Class, not of your property objTekst
I want to preserve the dynamically created control when postback occurs .
protected void Page_Load(object sender, EventArgs e)
{
}
private void CreateTable()
{
HtmlTableRow objHtmlTblRow = new HtmlTableRow();
HtmlTableCell objHtmlTableCell = new HtmlTableCell();
objHtmlTableCell.Controls.Add(new TextBox());
objHtmlTblRow.Cells.Add(objHtmlTableCell);
mytable.Rows.Add(objHtmlTblRow);
this.SaveControlState();
// this.Controls.Add(mytable);
}
protected void Button1_Click(object sender, EventArgs e)
{
CreateTable();
}
It can be achieved by calling CreateTable() in Page_Load. Is there any alternative way to preserve the control
Thanks
You can add them to a List when you create them and save your List to Session. On postback (Page_Load) load them from your Session to your Page.
the below code should work
protected void Page_PreInit(object sender, EventArgs e)
{
Control myControl = GetPostBackControl(this.Page);
}
protected override void OnInit(EventArgs e)
{
base.OnInit(e);
CreateTable()
}
public static Control GetPostBackControl(Page thisPage)
{
Control ctrlPostedback = null;
string ctrlName = thisPage.Request.Params.Get("__EVENTTARGET");
if (!String.IsNullOrEmpty(ctrlName))
{
ctrlPostedback = thisPage.FindControl(ctrlName);
}
else
{
foreach (string Item in thisPage.Request.Form)
{
Control c = thisPage.FindControl(Item);
if (((c) is System.Web.UI.WebControls.Button))
{
ctrlPostedback = c;
}
}
}
return ctrlPostedback;
}
The code works from UpdatePanel
Reference:http://www.asp.net/ajax/videos/how-to-dynamically-add-controls-to-a-web-page
This is a Master-Detail form. Master is a GridView. And, the Detail is a DetailsView.
The entire thing is achieved programmatically.
As you can see from the code, DetailsView is using the Master-objects's ID to retrieve the Detail items.
I need to make the ID column of the Master-GridView invisible. Coz, it is irrelevent for the user of the page. But it must not harm the page logic.
But the code-line, GridView1.Columns[1].Visible = false; is generating an exception.
Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index
How should I solve this problem?
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
BindData();
}
}
protected void BindData()
{
List<Order> orders = Order.Get();
GridView1.DataSource = orders;
GridView1.DataBind();
// This is giving Error...............!!!
GridView1.Columns[1].Visible = false;
// At first, when the page first loads,
// GridView1.SelectedIndex == -1
// So, this is done to automatically select the 1st item.
if (GridView1.SelectedIndex < 0)
{
GridView1.SelectedIndex = 0;
}
int selRowIndex = GridView1.SelectedIndex;
int selMasterId = Convert.ToInt32(GridView1.Rows[selRowIndex].Cells[1].Text);
Order master = Order.Get(selMasterId);
labItemsCount.Text = master.Items.Count.ToString();
DetailsView1.DataSource = master.Items;
DetailsView1.DataBind();
}
protected void GridView1_SelectedIndexChanged(object sender, EventArgs e)
{
BindData();
}
protected void DetailsView1_PageIndexChanging(object sender, DetailsViewPageEventArgs e)
{
DetailsView1.PageIndex = e.NewPageIndex;
BindData();
}
}
Have you considered using the DataKeyNames property of the gridview? This way you can remove the 'id' column from the GridView bu still access the 'id' value in the Page_Load.
DataKeyNames = "id"
Then you can get the value of the id like this.
int selRowIndex = GridView1.SelectedIndex;
int selMasterId = Convert.ToInt32(GridView.DataKeys[selRowIndex].Value);
Order master = Order.Get(selMasterId);
Alternately, you could try changing the visibility of the column in the OnRowBound event of the GridView.
protected void GridView_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.Header ||
e.Row.RowType == DataControlRowType.DataRow ||
e.Row.RowType == DataControlRowType.Footer)
{
e.Row.Cells[1].Visible = false;
}
}