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);
}
}
Related
I implemten ITemplate to dynamically create a Template field
TemplateField isReqField = new TemplateField();
isReqField.HeaderText = "Lizenz anfordern";
isReqField.ItemTemplate = new GridViewTemplate(DataControlRowType.DataRow, DataControlRowState.Normal, "isRequested", "bool");
isReqField.EditItemTemplate = new GridViewTemplate(DataControlRowType.DataRow, DataControlRowState.Edit, "isRequested", "bool");
gvLicence.Columns.Add(isReqField);
I implement InstantiateIn
public void InstantiateIn(System.Web.UI.Control container)
{
...
CheckBox ckRequest = new CheckBox();
ckRequest.ID = "ckRequest";
ckRequest.DataBinding += new EventHandler(this.CkIsRequested_DataBinding);
container.Controls.Add(ckRequest);
...
}
with the DataBinding Handler
private void CkIsRequested_DataBinding(Object sender, EventArgs e)
{
CheckBox ckRequest = (CheckBox)sender;
GridViewRow row = (GridViewRow)ckRequest.NamingContainer;
ckRequest.Checked = (bool)DataBinder.Eval(row.DataItem, columnName);
}
But then in the RowUpdating Handler I cannot find my checkBox Control with the FindControl Method:
protected void gvLicence_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
CheckBox chb = (CheckBox)gvLicence.Rows[e.RowIndex].FindControl("ckRequest");
bool requestValue = chb.Checked;
It throws an Exeption because gvLicence.Rows[e.RowIndex].FindControl("ckRequest") is null.
Many thanks for your attention and help.
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)
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
I Add Control Dynamiclly but; easc Postback event my controls are gone. I Can not see again my controls.
So How can I add control ?
Because you must recreate your controls on every postback,
see this article
Add the controls in the Page's Init event and they will be preserved in viewstate when posting back. Make sure they have a unique ID.
See this link...
ASP.NET Add Control on postback
A very trivial example..
public partial class MyPage : Page
{
TextBox tb;
protected override void OnInit(EventArgs e)
{
base.OnInit(e);
tb = new TextBox();
tb.ID = "testtb";
Page.Form.Controls.Add(tb);
}
protected override void OnLoad(EventArgs e)
{
base.OnLoad(e);
//tb.Text will have whatever text the user entered upon postback
}
}
You should always assign a unique ID to the UserControl in its ID property after control is loaded. And you should always recreate UserControl on postback.
To preserve posback data (i.e. TextBox'es) you must load UserControl in overriden LoadViewState method after calling base.LoadViewState - before postback data are handled.
Add controls in runtime and save on postback:
int NumberOfControls = 0;
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
ViewState["b1"] = 0;
}
else
{
if ((int)ViewState["b1"] > 0)
{
CreateBtn();
}
}
}
protected void btn1_Click(object sender, EventArgs e)
{
NumberOfControls = (int)ViewState["b1"];
Button b1 = new Button();
// b1.Attributes.Add("onclick", "x()");
b1.Text = "test2";
b1.ID = "b1_" + ++NumberOfControls;
b1.Click +=new System.EventHandler(btn11);
Panel1.Controls.Add(b1);
ViewState["b1"] = NumberOfControls;
}
protected void CreateBtn()
{
for (int i = 0; i < (int)ViewState["b1"];i++)
{
Button b1 = new Button();
// b1.Attributes.Add("onclick", "x()");
b1.Text = "test2";
b1.ID = "b1_" + i;
b1.Click += new System.EventHandler(btn11);
Panel1.Controls.Add(b1);
}
}
protected void btn11(object sender, System.EventArgs e)
{
Response.Redirect("AboutUs.aspx");
}
I have a datagrid (Asp.Net) with dynamically generated checkbox column..I am not able to generate the checkedChanged event for the checkbox..
Here is my code:
public class ItemTemplate : ITemplate
{
//Instantiates the checkbox
void ITemplate.InstantiateIn(Control container)
{
CheckBox box = new CheckBox();
box.CheckedChanged += new EventHandler(this.OnCheckChanged);
box.AutoPostBack = true;
box.EnableViewState = true;
box.Text = text;
box.ID = id;
container.Controls.Add(box);
}
public event EventHandler CheckedChanged;
private void OnCheckChanged(object sender, EventArgs e)
{
if (CheckedChanged != null)
{
CheckedChanged(sender, e);
}
}
}
and Here is the event
private void OnCheckChanged(object sender, EventArgs e)
{
}
Thanks In advance
When do you add your custom column? If it is on load, then it is too late. Load it on init. I.e. following works with your code:
protected void Page_Init(object sender, EventArgs e)
{
ItemTemplate myTemplate = new ItemTemplate();
myTemplate.CheckedChanged += new EventHandler(myTemplate_CheckedChanged);
TemplateField col = new TemplateField();
col.ItemTemplate = myTemplate;
col.ItemStyle.Wrap = false;
grid.Columns.Add(col);
}
If your checkbox ID's are not being set the same way on every postback, then they can never be connected to the event handlers when it comes time to process the events. Where is your field "id" coming from?