I am populating an html table from a datatable with an edit button in each table row for each datatable row.
I am adding the edit button in code as follows:
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
if (UserName != null && UserName != "")
{
hUserName.Value = UserName;
}
else
if (hUserName.Value != "")
UserName = hUserName.Value;
ShowTrainingEntry();
ShowUserTraining(); <-------------- this method populates table
hTID.Value = TrainingID.ToString();
}
}
public void ShowUserTraining()
{
....
dTotalTrainingHours += ShowTrainingInPeriod(dv);
....
}
protected decimal ShowTrainingInPeriod(DataView dv)
{
....
foreach (DataRowView rowView in dv)
{
....
Button bEdit = new Button();
int iTID = Convert.ToInt32(dr["ID"].ToString());
bEdit.Text = "Edit";
bEdit.ID = "btnEdit_" + iTID.ToString();
bEdit.CommandName = "Edit";
bEdit.CommandArgument = iTID.ToString();
bEdit.Command += new CommandEventHandler(btnEdit_Click);
....
}
....
}
public void btnEdit_Click(object sender, CommandEventArgs e)
{
clsLog.WriteLog("btnEdit_Click fired.");
clsLog.WriteLog("\t" + e.CommandName);
clsLog.WriteLog("\t" + e.CommandArgument.ToString());
UserName = hUserName.Value;
TrainingID = Convert.ToInt32(e.CommandArgument);
ShowTrainingEntry();
ShowUserTraining();
}
as requested - HTML table:
<asp:Table ID="tblMain" runat="server" Width="900" CellPadding="3" CellSpacing="0" CssClass="noborder">
</asp:Table>
btnEdit_Click is NOT being fired (no log entries).
I have researched this for several hours and the only thing consistent I have found is that the event must be wired to the button during Page_Load which I believe is happening correctly.
Any help would be greatly appreciated.
Thanks,
John
try to do event register
btnEdit_Click.Click += new EventHandler(this.btnEdit_Click);
Related
I am using visual studio 2010 and crystal report 13.0
The report viewer displays the first page properly. But the next page button is not working. If i click on next page button then it shows loading message and stays there only.None of the report viewer controls are working.
please help me out
I found the solution.
Manually add the Page_Init() event and wire it up in the InitializeCompnent() with
this.Init += new System.EventHandler(this.Page_Init).
Move the contents of Page_Load to Page_Init().
Add if (!IsPostBack) condition in PageInIt.
protected void Page_Init(object sender, EventArgs e)
{
if (!IsPostBack)
{
ReportDocument crystalReportDocument = new ReportDocumment();
crystalReportDocument.SetDataSource(DataTableHere);
_reportViewer.ReportSource = crystalReportDocument;
Session["ReportDocument"] = crystalReportDocument;
}
else
{
ReportDocument doc = (ReportDocument)Session["ReportDocument"];
_reportViewer.ReportSource = doc;
}
}
Instead of manually identifying the moment to bind, you could use the CrystalReportViewer AutoDataBind property in combination with the DataBinding event.
Autobind definition:
// Summary:
// Boolean. Gets or sets whether automatic data binding to a report source is
// used. If the value is set to True, the DataBind() method is called after
// OnInit() or Page_Init().
[Category("Data")]
[DefaultValue(false)]
[DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]
public bool AutoDataBind { get; set; }
You could use this property in the following manner:
In the ASPX:
<CR:CrystalReportViewer ID="_reportViewer" runat="server" AutoDataBind="true" OnDataBinding="_reportViewer_DataBinding" />
And in the ASPX.CS:
protected void _reportViewer_DataBinding(object sender, EventArgs e)
{
if (!IsPostBack)
{
ReportDocument crystalReportDocument = new ReportDocumment();
crystalReportDocument.SetDataSource(DataTableHere);
_reportViewer.ReportSource = crystalReportDocument;
Session["ReportDocument"] = crystalReportDocument;
}
else
{
ReportDocument doc = (ReportDocument)Session["ReportDocument"];
_reportViewer.ReportSource = doc;
}
}
Done! Shift your Page load Event to Page Init Event.
protected void Page_Load(object sender, EventArgs e)
{
if (IsPostBack)
{
int pageIndex =((CrystalDecisions.Shared.PageRequestContext)
CrystalReportViewer1.RequestContext).PageNumber;
//Bind Report with filter and datasource
string ControID = GetPostBackControlName(this);
//get and check Crystal Report Navigation button event after Bind Report
if (ControID == null)
{
((CrystalDecisions.Shared.PageRequestContext)
CrystalReportViewer1.RequestContext).PageNumber = pageIndex;
}
}
}
public string GetPostBackControlName(Page Page)
{
Control control = null;
string ctrlname = Page.Request.Params["__EVENTTARGET"];
if (ctrlname != null && ctrlname != String.Empty)
{
control = Page.FindControl(ctrlname);
}
else
{
string ctrlStr = String.Empty;
Control c = null;
foreach (string ctl in Page.Request.Form)
{
if (ctl.EndsWith(".x") || ctl.EndsWith(".y"))
{
ctrlStr = ctl.Substring(0, ctl.Length - 2);
c = Page.FindControl(ctrlStr);
}
else
{
c = Page.FindControl(ctl);
}
if (c is System.Web.UI.WebControls.Button ||
c is System.Web.UI.WebControls.ImageButton)
{
control = c;
break;
}
}
}
if (control == null)
{
return null;
}
else
{
return control.ID;
}
}
I've got a checkboxlist on my asp.net page. I'm populating it with countries. I've added a "SelectedIndexChanged" event that is supposed to check that if one of the selected countries is Africa, it should make a textbox visible, otherwise visible=false if it is not selected. I have changed the AutoPostback to true. But the problem that I'm having is that it is not doing an autopostback (it's not going into the method at all). Could somebody please help me on this?
This is what I've done:
<div id="div1" style="overflow-x:auto; width:100%; max-width:100%; height:150px; max-height:150px;" runat="server">
<asp:CheckBoxList ID="lstLocations" CssClass="CheckBoxList" runat="server" Width="40%" Height="100%" AutoPostBack="True" OnSelectedIndexChanged="lstLocations_SelectedIndexChanged" >
</asp:CheckBoxList>
</div>
Populating the checkboxlist:
private void CreateRegionList()
{
lstLocations.Items.Clear();
cn = new SqlConnection(GetConnectionString());
SqlCommand myCmd = new SqlCommand("SELECT ID, Region FROM CanonSALeads_Region ORDER BY Region", cn);
cn.Open();
SqlDataReader myReader = myCmd.ExecuteReader();
lstLocations.AutoPostBack = false;
lstLocations.CellPadding = 5;
lstLocations.CellSpacing = 5;
lstLocations.RepeatColumns = 1;
lstLocations.RepeatDirection = RepeatDirection.Vertical;
lstLocations.RepeatLayout = RepeatLayout.Flow;
lstLocations.TextAlign = TextAlign.Right;
lstLocations.CssClass = "CheckBoxList";
if (myReader.HasRows)
{
while (myReader.Read())
{
CheckBox cb = new CheckBox();
cb.ID = myReader[0].ToString();
cb.Text = myReader[1].ToString();
cb.AutoPostBack = false;
cb.CssClass = "CheckBox";
lstLocations.Items.Add(new ListItem(myReader[1].ToString(), myReader[0].ToString()));
lstLocations.Controls.Add(new LiteralControl("<br>"));
}
}
cn.Close();
myReader.Close();
}
And this is my selectedIndexChanged event:
protected void lstLocations_SelectedIndexChanged(object sender, EventArgs e)
{
string value = null;
try
{
foreach (ListItem checkBox in lstLocations.Items)
{
if (checkBox.Selected == true)
{
value = checkBox.Text;
if (value == "Africa")
{
txtCountryOfAfrica.Visible = true;
lblAfricaCountry.Visible = true;
}
}
else
{
value = checkBox.Text;
if (value == "Africa")
{
txtCountryOfAfrica.Visible = false;
lblAfricaCountry.Visible = false;
}
}
}
}
catch (Exception ex)
{
string msg = "Select Error:";
msg += ex.Message;
throw new Exception(msg);
}
}
Page_Load method:
protected void Page_Load(object sender, EventArgs e)
{
string userName = System.Security.Principal.WindowsIdentity.GetCurrent().Name;
txtUser.Text = userName;
if (!IsPostBack)
{
ContainerDocumentation.ActiveTab = tabAddCustomer;
PopulateSector();
CreateRegionList();
PopulateOpportunitySource();
CreatelstProductGroupList();
PopulateStatus();
PopulateTenders();
PopulateOtherOpportunityType();
}
}
My guess: you are calling CreateRegionList in Page_Load without checking the IsPostBack property. That reloads all items from database and prevents this event from being triggered.
So check it:
protected bvoid Page_Load(Objject sender, EventArgs e)
{
if(!IsPostBack)
{
CreateRegionList();
}
}
That's because you have to set true to:
lstLocations.AutoPostBack = true;
I am using a wizard. and in step two the user can add information about a location that will be stored. He can add as many locations as he likes.
In step three I want to enter more information about the specific location.
To select which location to use I have ASP:dropdownlist that I populate when user enters stuff.
I want to change index but it just does not work It never goes into the function when I tried debugging. I am using a label to debug.
When I change the selected item the page reloads and the first item in the dropdown list is always selected even though I selected something else. I do not understand why that happens
here is what I have
ASPX File
Select location to enter data for:
<asp:DropDownList ID="s3_location_list" runat="server" AutoPostBack="true" OnSelectedIndexChanged="stepThree_location_list_SelectedIndexChanged">
</asp:DropDownList>
Current location index:
<asp:Label ID="Label3" runat="server" Text="Label"></asp:Label>
CS files
/*This is where I add data to the drop down list
protected void stepTwo_addLocationData(object Sender, System.EventArgs e)
{
//initialize a temporary string array to get all the data from the form
//Console.Write("AAAAA"+ Context.Items["IsRefreshed"]);
Boolean refreshed = (Boolean)Context.Items["IsRefreshed"];
if (!refreshed)
{
//if user is adding a new entry to the location table
LocationData new_location = new LocationData();
//add stuff to locationData
if (stepTwo_locationTableIndex == -1)
{
//add the new_location element into the location_data array
location_data.Add(new_location);
//redraw the table
DataRow dr = dt.NewRow();
dr["Location"] = new_location.City;
//dr["Name"] = loc;
dt.Rows.Add(dr);
}
else
{
location_data[stepTwo_locationTableIndex] = new_location;
dt.Rows[stepTwo_locationTableIndex]["Location"] = City.Text;
}
GridView1.DataSource = dt.DefaultView;
GridView1.DataBind();
///CreateTable();
stepFive_setLocationListOptions();
stepThree_setLocationListOptions();
stepTwo_resetForm();
}
/*this is the page load on step 3
protected void stepThree_load()
{
if (!IsPostBack && Session["s_s3_locationDropdownIndex"] == null)
{
stepThree_locationDropdownIndex = s3_location_list.SelectedIndex;
Session["s_s3_locationDropdownIndex"] = stepThree_locationDropdownIndex;
}
else
{
stepThree_locationDropdownIndex = (int) Session["s_s3_locationDropdownIndex"];
}
s3_location_list.SelectedIndex = stepThree_locationDropdownIndex;
Label3.Text = "" + s3_location_list.SelectedIndex;
}
/*this is my where I populate the list
protected void stepThree_setLocationListOptions()
{
s3_location_list.Items.Clear();
int i = 0;
foreach (LocationData item in location_data)
{
s3_location_list.Items.Add(new ListItem(item.City, "" + i));
}
s3_location_list.DataBind();
}
/* this is the function thats callled when selected index is changed.
protected void stepThree_location_list_SelectedIndexChanged(object sender, EventArgs e)
{
Label3.Text = "Hello";
}
I think the problem is the order of execution. You should only initialize a DropDownList once, otherwise it will overwrite your SelectedIndex. For example, use the OnInit event:
<asp:DropDownList ID="s3_location_list"
runat="server"
OnInit="s3_location_list_Init"/>
And write the event method like this:
protected void s3_location_list_Init(object sender, EventArgs e)
if (!IsPostBack) {
foreach (LocationData item in location_data)
{
s3_location_list.Items.Add(new ListItem(item.City, "" + i));
}
s3_location_list.DataBind();
}
}
I have gridview built dynamically at run-time bind to datatable, and button to save gridview data placed outside gridview
1- Create GridView
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
CreateGrid();
}
}
void CreateGrid()
{
int nTransID = Convert.ToInt32(Session["trans_id"]);
//
string strSQL = #"EXEC [dbo].[sp_GetTransaction] " + nTransID;
DataTable dtData = clsGlobal.GetDataTable(strSQL);
//
if (ViewState["dtTransDetail"] == null) ViewState.Add("dtTransDetail", dtData);
else ViewState["dtTransDetail"] = dtData;
//
foreach (DataColumn dc in dtData.Columns)
{
if (dc.ColumnName.Contains("!;"))
{
TemplateField tField = new TemplateField();
tField.ItemTemplate = new AddTemplateToGridView(ListItemType.Item, dc.ColumnName);
//\\ --- template contain textbox
tField.HeaderText = dc.ColumnName;
GridView1.Columns.Add(tField);
}
}
}
This is my template class:
public class AddTemplateToGridView : ITemplate
{
ListItemType _type;
string _colName;
public AddTemplateToGridView(ListItemType type, string colname)
{
_type = type;
_colName = colname;
}
void ITemplate.InstantiateIn(System.Web.UI.Control container)
{
switch (_type)
{
case ListItemType.Item:
TextBox text = new TextBox();
text.ID = "txtAmount";
text.DataBinding += new EventHandler(txt_DataBinding);
container.Controls.Add(text);
break;
}
}
void txt_DataBinding(object sender, EventArgs e)
{
TextBox textBox = (TextBox)sender;
GridViewRow container = (GridViewRow)textBox.NamingContainer;
object dataValue = DataBinder.Eval(container.DataItem, _colName);
if (dataValue != DBNull.Value)
{
textBox.Text = dataValue.ToString();
}
}
}
So i have a gridview with textboxe's all open to edit at once
The problem is, when i click on Save button "which is outside gridview" all textboxe's gone
protected void btnSave_Command(object sender, CommandEventArgs e)
{
for (int nRow = 0; nRow < GridView1.Rows.Count; nRow++)
{
for (int nCol = 0; nCol < GridView1.Columns.Count; nCol++)
{
if (GridView1.Rows[nRow].Cells[nCol].Controls.Count == 0) continue;
//\\ --- Controls.Count always = 0
//\\ --- However each cell contain textbox
//\\ --- textbox disappear after save button clicked
TextBox txt = (TextBox)GridView1.Rows[nRow].Cells[nCol].Controls[0];
}
}
}
It looks like you are not creating the GridView after a postback, and the Save button is causing a postback. You need to dynamically create the GridView on each page load. Also, I have found this documentation on the ASP.NET page lifecycle helpful on numerous occasions.
In the documentation, you will see the slightly unintuitive reason why your code isn't working as you would like - btnSave_Command is not run until after a postback and Page_Load.
I populate DropDownList in ASP.NET webforms:
<asp:DropDownList runat="server" ID="salesman"></asp:DropDownList>
users= Buslayer.GetSalesRep();
foreach (userentity user in users)
{
salesman.Items.Add(new ListItem(user.FirstName + " " + user.LastName,
user.UserID.ToString()));
}
After submission, I am still getting selected index = 0,
I tried all of this but failed:
Response.Write("" + salesman.SelectedValue);
Response.Write("" + salesman.SelectedItem.Value);
Response.Write("" + salesman.SelectedIndex);
Are you checking for the Page posting back with you databind?
Your page load should look something like:
protected void Page_Load(object sender, EventArgs e)
{
if(!IsPostBack)
{
BindData();
}
}
protected void BindData()
{
// Get your data
ddl.DataSource = yourData;
ddl.DataBind();
}