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Dynamic radgrid with template columns and "Multiple controls with same ID" error on postback

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Ajax

This is a migrated thread and some comments may be shown as answers.

Brad Divine asked on 25 Aug 2010, 02:52 AM

Hi guys,

Having some trouble with my grid. It's in a web control, dynamically built in Page_Init(). The page loads fine the first time, but on postback I get an exception that there is already a control called 'tbTemplateControl' That name belongs to one of my GridTemplateColumns, FacilityColumn. Here's the code in my codebehind

RadGrid rgFacilities;

protected void Page_Load(object sender, EventArgs e)

{

rgFacilities = (RadGrid)PlaceHolder1.FindControl("rgFacilities");

RadAjaxManagerProxy1.AjaxSettings.AddAjaxSetting(rgFacilities, rgFacilities);

}

protected void Page_Init(object sender, EventArgs e)

{

CreateGrid();

}

void rgFacilities_NeedDataSource(object source, GridNeedDataSourceEventArgs e)

{

rgFacilities.DataSource = table;

}

DataTable _table;

private DataTable table

{

get

{

if (_table == null)

{

CreateTable();

}

return _table;

}

set

{

_table = value;

}

public Dictionary<string, decimal> totals;

private void CreateGrid()

{

rgFacilities = new RadGrid();

rgFacilities.ID = "rgFacilities";

rgFacilities.AutoGenerateColumns=false;

rgFacilities.ShowFooter=true;

rgFacilities.Width=750;

rgFacilities.NeedDataSource += new GridNeedDataSourceEventHandler(rgFacilities_NeedDataSource);

rgFacilities.AllowMultiRowEdit=true;

rgFacilities.MasterTableView.TableLayout = GridTableLayout.Auto;

rgFacilities.MasterTableView.EditMode = GridEditMode.InPlace;

rgFacilities.ClientSettings.Scrolling.FrozenColumnsCount=1;

rgFacilities.ClientSettings.Scrolling.AllowScroll=true;

rgFacilities.ClientSettings.Scrolling.SaveScrollPosition=true;

rgFacilities.ClientSettings.Scrolling.UseStaticHeaders = true;

totals = new Dictionary<string,decimal>();

FundColumn column = new FundColumn();

rgFacilities.MasterTableView.Columns.Clear();

rgFacilities.MasterTableView.Columns.Add(column);

for (int i = 1; i < table.Columns.Count; i++)

{

decimal total = new decimal();

for (int j = 0; j < table.Rows.Count; j++)

{

if (table.Rows[j][i] is decimal)

{

total += (decimal)table.Rows[j][i];

}

FacilityColumn col = new FacilityColumn(total,false);

totals[col.UniqueName] = total;

//col.Aggregate = GridAggregateFunction.Sum;

//col.FooterAggregateFormatString = "{0:C}";

col.DataField = table.Columns[i].ColumnName;

col.HeaderText = table.Columns[i].ColumnName;

rgFacilities.MasterTableView.Columns.Add(col);

total = 0;

}

for (int i = 0; i < table.Rows.Count && i < rgFacilities.PageSize; i++)

{

rgFacilities.EditIndexes.Add(i);

}

this.PlaceHolder1.Controls.Clear();

this.PlaceHolder1.Controls.Add(rgFacilities);

}

private void CreateTable()

{

table = new DataTable();

table.Columns.Add(new DataColumn("Fund", typeof(string)));

table.Columns.Add(new DataColumn("Facility1", typeof(decimal)));

table.Columns.Add(new DataColumn("Facility2", typeof(decimal)));

table.Columns.Add(new DataColumn("Facility3", typeof(decimal)));

table.Columns.Add(new DataColumn("Facility4", typeof(decimal)));

table.Columns.Add(new DataColumn("Facility5", typeof(decimal)));

table.Columns.Add(new DataColumn("Facility6", typeof(decimal)));

table.Columns.Add(new DataColumn("Facility7", typeof(decimal)));

table.Columns.Add(new DataColumn("Facility8", typeof(decimal)));

table.Columns.Add(new DataColumn("Facility9", typeof(decimal)));

table.Columns.Add(new DataColumn("Facility10", typeof(decimal)));

table.Columns.Add(new DataColumn("Facility11", typeof(decimal)));

table.Columns.Add(new DataColumn("Facility12", typeof(decimal)));

table.Columns.Add(new DataColumn("Facility13", typeof(decimal)));

table.Columns.Add(new DataColumn("Facility14", typeof(decimal)));

table.Columns.Add(new DataColumn("Facility15", typeof(decimal)));

DataRow row1 = table.NewRow();

DataRow row2 = table.NewRow();

DataRow row3 = table.NewRow();

DataRow row4 = table.NewRow();

DataRow row5 = table.NewRow();

DataRow row6 = table.NewRow();

DataRow row7 = table.NewRow();

DataRow row8 = table.NewRow();

DataRow row9 = table.NewRow();

DataRow row10 = table.NewRow();

DataRow row11 = table.NewRow();

DataRow row12 = table.NewRow();

DataRow row13 = table.NewRow();

DataRow row14 = table.NewRow();

DataRow row15 = table.NewRow();

DataRow row16 = table.NewRow();

DataRow row17 = table.NewRow();

DataRow row18 = table.NewRow();

DataRow row19 = table.NewRow();

DataRow row20 = table.NewRow();

row1["Fund"] = "Fund1";

row2["Fund"] = "Fund2";

row3["Fund"] = "Fund3";

row4["Fund"] = "Fund4";

row5["Fund"] = "Fund5";

row6["Fund"] = "Fund6";

row7["Fund"] = "Fund7";

row8["Fund"] = "Fund8";

row9["Fund"] = "Fund9";

row10["Fund"] = "Fund10";

row11["Fund"] = "Fund11";

row12["Fund"] = "Fund12";

row13["Fund"] = "Fund13";

row14["Fund"] = "Fund14";

row15["Fund"] = "Fund15";

row16["Fund"] = "Fund16";

row17["Fund"] = "Fund17";

row18["Fund"] = "Fund19";

row19["Fund"] = "Fund19";

row20["Fund"] = "Fund20";

row1[1] = 0.0d;

row1[2] = 0.0d;

row1[3] = 0.0d;

row1[4] = 2.0d;

row1[5] = 2.0d;

row1[6] = 0.0d;

row1[7] = 0.0d;

row1[8] = 0.0d;

row1[9] = 2.0d;

row1[10] = 2.0d;

row1[11] = 0.0d;

row1[12] = 0.0d;

row1[13] = 0.0d;

row1[14] = 2.0d;

row1[15] = 2.0d;

row2[1] = 1.0d;

row2[2] = 1.0d;

row2[3] = 1.0d;

row2[4] = 1.0d;

row2[5] = 1.0d;

row2[6] = 1.0d;

row2[7] = 1.0d;

row2[8] = 1.0d;

row2[9] = 1.0d;

row2[10] = 1.0d;

row2[11] = 1.0d;

row2[12] = 1.0d;

row2[13] = 1.0d;

row2[14] = 1.0d;

row2[15] = 1.0d;

row3[1] = 0.4d;

row3[2] = 0.5d;

row3[3] = 0.6d;

row3[4] = 0.7d;

row3[5] = 0.8d;

row3[6] = 0.4d;

row3[7] = 0.5d;

row3[8] = 0.6d;

row3[9] = 0.7d;

row3[10] = 0.8d;

row3[11] = 0.4d;

row3[12] = 0.5d;

row3[13] = 0.6d;

row3[14] = 0.7d;

row3[15] = 0.8d;

row4[1] = 3.0d;

row4[2] = 4.0d;

row4[3] = 5.0d;

row4[4] = 6.0d;

row4[5] = 7.0d;

row4[6] = 3.0d;

row4[7] = 4.0d;

row4[8] = 5.0d;

row4[9] = 6.0d;

row4[10] = 7.0d;

row4[11] = 3.0d;

row4[12] = 4.0d;

row4[13] = 5.0d;

row4[14] = 6.0d;

row4[15] = 7.0d;

row5[1] = 1.0d;

row5[2] = 2.0d;

row5[3] = 3.0d;

row5[4] = 4.0d;

row5[5] = 5.0d;

row5[6] = 1.0d;

row5[7] = 2.0d;

row5[8] = 3.0d;

row5[9] = 4.0d;

row5[10] = 5.0d;

row5[11] = 1.0d;

row5[12] = 2.0d;

row5[13] = 3.0d;

row5[14] = 4.0d;

row5[15] = 5.0d;

table.Rows.Add(row1);

table.Rows.Add(row2);

table.Rows.Add(row3);

table.Rows.Add(row4);

table.Rows.Add(row5);

table.Rows.Add(row6);

table.Rows.Add(row7);

table.Rows.Add(row8);

table.Rows.Add(row9);

table.Rows.Add(row10);

table.Rows.Add(row11);

table.Rows.Add(row12);

table.Rows.Add(row13);

table.Rows.Add(row14);

table.Rows.Add(row15);

table.Rows.Add(row16);

table.Rows.Add(row17);

table.Rows.Add(row18);

table.Rows.Add(row19);

table.Rows.Add(row20);

}

And here are my template column classes:

public class FacilityColumn : GridTemplateColumn

{

public FacilityColumn()

: this(0, false)

{

}

public FacilityColumn(decimal total, bool zeroAllocation)

: base()

{

//this.UniqueName = RandomString(10, true);

HeaderTemplate = new FacilityHeaderTemplate(this);

ItemTemplate = new FacilityItemTemplate(this);

EditItemTemplate = new FacilityEditItemTemplate(this);

FooterTemplate = new FacilityFooterTemplate(this, total, zeroAllocation);

}

public class FacilityEditItemTemplate : ITemplate, IBindableTemplate

{

private FacilityColumn _col;

OrderedDictionary _changes;

private OrderedDictionary Changes

{

get

{

if (_changes == null)

_changes = new OrderedDictionary();

return _changes;

}

public FacilityEditItemTemplate(FacilityColumn col)

{

_col = col;

}

public void InstantiateIn(Control container)

{

TextBox tb = new TextBox();

tb.ID = "tb" + _col.UniqueName;

tb.DataBinding += new EventHandler(tb_DataBinding);

tb.TextChanged += new EventHandler(tb_TextChanged);

tb.Width = Unit.Pixel(120);

container.Controls.Add(tb);

}

void tb_TextChanged(object sender, EventArgs e)

{

Changes.Add("Fund|" + _col.UniqueName, (sender as TextBox).Text);

}

void tb_DataBinding(object sender, EventArgs e)

{

TextBox tb = (sender as TextBox);

GridDataItem container = (GridDataItem)tb.NamingContainer;

tb.Text = ((DataRowView)container.DataItem)[_col.DataField].ToString();

}

public IOrderedDictionary ExtractValues(Control container)

{

return Changes;

}

public class FacilityHeaderTemplate : ITemplate

{

private FacilityColumn _col;

public FacilityHeaderTemplate(FacilityColumn col)

: base()

{

_col = col;

}

public void InstantiateIn(Control container)

{

Label lbl = new Label();

lbl.DataBinding += new EventHandler(lbl_DataBinding);

container.Controls.Add(lbl);

}

void lbl_DataBinding(object sender, EventArgs e)

{

(sender as Label).Text = _col.HeaderText;

}

public class FacilityItemTemplate : ITemplate

{

private FacilityColumn _col;

public FacilityItemTemplate(FacilityColumn col)

{

_col = col;

}

public void InstantiateIn(Control container)

{

Label lbl = new Label();

lbl.DataBinding += new EventHandler(lbl_DataBinding);

container.Controls.Add(lbl);

}

void lbl_DataBinding(object sender, EventArgs e)

{

Label lbl = (sender as Label);

GridDataItem container = (GridDataItem)lbl.NamingContainer;

string val = ((DataRowView)container.DataItem)[_col.DataField].ToString();

if (String.IsNullOrEmpty(val))

val = " ";

lbl.Text = string.Format("{0:C}", val);

}

public class FacilityFooterTemplate:ITemplate

{

FacilityColumn _col;

decimal _total;

bool _zeroAllocation;

public FacilityFooterTemplate(FacilityColumn col, decimal total, bool zeroAllocation)

{

_col = col;

_total = total;

_zeroAllocation = zeroAllocation;

}

#region ITemplate Members

public void InstantiateIn(Control container)

{

Label label = new Label();

RadioButtonList radioList = new RadioButtonList();

label.ID = _col.UniqueName + "-total";

label.Text = _total.ToString("C");

radioList.ID = _col.UniqueName + "-zero";

radioList.Items.Add(new ListItem("yes", "1"));

radioList.Items.Add(new ListItem("no", "0"));

radioList.AutoPostBack = true;

if (_zeroAllocation)

radioList.SelectedIndex = 0;

else

radioList.SelectedIndex = 1;

radioList.RepeatDirection = RepeatDirection.Horizontal;

radioList.SelectedIndexChanged += new EventHandler(radioList_SelectedIndexChanged);

container.Controls.Add(label);

container.Controls.Add(radioList);

}

void radioList_SelectedIndexChanged(object sender, EventArgs e)

{

}

#endregion

}

private class ReadOnlyTemplate : ITemplate, IBindableTemplate

{

protected Label label;

private string colname;

public ReadOnlyTemplate(string cName)

{

colname = cName;

}

#region ITemplate Members

public void InstantiateIn(Control container)

{

label = new Label();

label.ID = "templateColumnLabel";

label.DataBinding += label_DataBinding;

container.Controls.Add(label);

}

void label_DataBinding(object sender, EventArgs e)

{

Label label = (Label)sender;

GridDataItem container = (GridDataItem)label.NamingContainer;

label.Text = (string)((DataRowView)container.DataItem)[colname];

}

#endregion

#region IBindableTemplate Members

OrderedDictionary _changes;

private OrderedDictionary Changes

{

get

{

if (_changes == null)

_changes = new OrderedDictionary();

return _changes;

}

public System.Collections.Specialized.IOrderedDictionary ExtractValues(Control container)

{

return Changes;

}

#endregion

}

I apologize for the length, but I think that's everything you need to use in a test project.

So I'm creating the grid in Page_Init(), databinding in NeedDataSource(). What else can I try?

Thanks,
Brad

3 Answers, 1 is accepted

answered on 27 Aug 2010, 04:17 PM

Hello Brad,

I have examined your code and I assume that the cause of the issue is that you clear the controls in the place holder (including the grid itself) on Page_Init:

private void CreateGrid()

{

rgFacilities = new RadGrid();

rgFacilities.ID = "rgFacilities";

//...

this.PlaceHolder1.Controls.Clear();

this.PlaceHolder1.Controls.Add(rgFacilities);

}

Please try removing this line from your code and let me know whether it helps.

All the best,
Mira
the Telerik team

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Dynamic radgrid with template columns and &quot;Multiple controls with same ID&quot; error on postback

3 Answers, 1 is accepted

Dynamic radgrid with template columns and "Multiple controls with same ID" error on postback