GridView.FooterRow is Null when custom CreateChildControls RSS

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  drodrig

  Member

  45 Points

  9 Posts

  GridView.FooterRow is Null when custom CreateChildControls

  Jul 27, 2006 12:05 PM|LINK

  Hi all, im tryng to have a GridView that suppoorts empty datasource, and INSERT functionallity at FooterRow.

  I have my own class derived from GridView withfollowing code:

  protected override int CreateChildControls(System.Collections.IEnumerable dataSource, bool dataBinding)

  {

  int numRows = base.CreateChildControls(dataSource, dataBinding);

  //no data rows created, create empty table if enabled

  if (numRows == 0 && ShowEmptyTable)

  {

  //create table

  Table table = new Table();

  table.ID = this.ID;

  //create a new header row

  GridViewRow row = base.CreateRow(-1, -1, DataControlRowType.Header, DataControlRowState.Normal);

  //convert the exisiting columns into an array and initialize

  DataControlField[] fields = new DataControlField[this.Columns.Count];

  this.Columns.CopyTo(fields, 0);

  this.InitializeRow(row, fields);

  table.Rows.Add(row);

  //create the empty row

  row = new GridViewRow(-1, -1, DataControlRowType.DataRow, DataControlRowState.Normal);

  TableCell cell = new TableCell();

  cell.ColumnSpan = this.Columns.Count;

  cell.Width = Unit.Percentage(100);

  cell.Controls.Add(new LiteralControl(EmptyTableRowText));

  row.Cells.Add(cell);

  table.Rows.Add(row);

  if (this.ShowFooter)

  {

  //create a new footer row

  GridViewRow rowFooter = base.CreateRow(-1, -1, DataControlRowType.Footer, DataControlRowState.Normal);

  //convert the exisiting columns into an array and initialize

  DataControlField[] fieldsFooter = new DataControlField[this.Columns.Count];

  this.Columns.CopyTo(fieldsFooter, 0);

  this.InitializeRow(rowFooter, fieldsFooter);

  table.Rows.Add(rowFooter);

  }

  this.Controls.Add(table);

  GridViewRow testFooter=this.FooterRow; //This is for testing that Footer is NULL

  }

  return numRows;

  }

  When I press a Buttom in page, I have this code:

  DropDownList DeviceID = (DropDownList)GridViewAmbientActions.FooterRow.FindControl("DropDownListDevicesAdd");

  But the result is that FooterRow is null.

  Any idea why?

  Thank you

  David
  • Locked by mbanavige on Aug 12, 2009 04:22 AM
• • Reply
  

  drodrig

  Member

  45 Points

  9 Posts

  Re: GridView.FooterRow is Null when custom CreateChildControls

  Jul 29, 2006 11:40 AM|LINK

  Here is the solution thanks to CISCBrain

  protected GridViewRow _footerRow2;

  public override GridViewRow FooterRow

  {

  get

  {

  GridViewRow f = base.FooterRow;

  if (f != null)

  return f;

  else

  return _footerRow2;

  }

  }

  protected GridViewRow _headerRow2;

  public override GridViewRow HeaderRow

  {

  get

  {

  GridViewRow h = base.HeaderRow;

  if (h != null)

  return h;

  else

  return this._headerRow2;

  }

  protected override int CreateChildControls(System.Collections.IEnumerable dataSource, bool dataBinding)

  {

  int numRows = base.CreateChildControls(dataSource, dataBinding);

  //no data rows created, create empty table if enabled

  if (numRows == 0 && ShowEmptyTable)

  {

  //create table

  Table table = new Table();

  table.ID = this.ID;

  //convert the exisiting columns into an array and initialize

  DataControlField[] fields = new DataControlField[this.Columns.Count];

  this.Columns.CopyTo(fields, 0);

  if (this.ShowHeader)

  {

  //create a new header row

  _headerRow2 = base.CreateRow(-1, -1, DataControlRowType.Header, DataControlRowState.Normal);

  this.InitializeRow(_headerRow2, fields);

  table.Rows.Add(_headerRow2);

  }

  //create the empty row

  GridViewRow emptyRow = new GridViewRow(-1, -1, DataControlRowType.EmptyDataRow, DataControlRowState.Normal);

  TableCell cell = new TableCell();

  cell.ColumnSpan = this.Columns.Count;

  cell.Width = Unit.Percentage(100);

  if (!String.IsNullOrEmpty(EmptyDataText))

  cell.Controls.Add(new LiteralControl(EmptyDataText));

  if (this.EmptyDataTemplate != null)

  EmptyDataTemplate.InstantiateIn(cell);

  emptyRow.Cells.Add(cell);

  table.Rows.Add(emptyRow);

  if (this.ShowFooter)

  {

  //create footer row

  _footerRow2 = base.CreateRow(-1, -1, DataControlRowType.Footer, DataControlRowState.Normal);

  this.InitializeRow(_footerRow2, fields);

  table.Rows.Add(_footerRow2);

  }

  this.Controls.Clear();

  this.Controls.Add(table);

  }

  return numRows;

  }

  }

  David
• • Reply
  

  cblaze22

  Member

  140 Points

  28 Posts

  Re: GridView.FooterRow is Null when custom CreateChildControls

  Aug 12, 2006 07:58 AM|LINK

  I see what is going on in the code, but how do you actually perform the override in the application.  Where would the code go and such?
  
• • Reply
  

  andrecarrilh...

  Participant

  966 Points

  223 Posts

  Re: GridView.FooterRow is Null when custom CreateChildControls

  Aug 22, 2006 03:34 PM|LINK

  Hi

  How can I use the code u posted? Where to a put it and how do a set it to show the header and footer in my custom GridView?

  Cheers

  André da Silva Carrilho
  http://www.acarrilho.com/
  
  If the post has been answered please marke it as Answered :-)
• • Reply
  

  aquamoth

  Member

  25 Points

  11 Posts

  Extended GridView lacks Theme!

  Mar 06, 2007 07:23 PM|LINK

  This looks like a great way to extend the gridview control.

  However, as soon as I extend the GridView, the StyleSheetTheme doesn't kick in.

  To make sure, I tried to extend the GridView without adding ANY code (no overrides, no new properties, nothing). The theme disappears for my custom control anyway, but it works fine for other gridviews on the same page!

  Any idea's why? 

   

  GridView Themes

• • Reply
  

  StephenSkinn...

  Member

  4 Points

  8 Posts

  Re: Extended GridView lacks Theme!

  Jul 20, 2007 04:45 PM|LINK

  I'm running into the same theme issue. Any resolution to this in the last 2 years?

• • Reply
  

  neco

  Member

  2 Points

  1 Post

  Re: Extended GridView lacks Theme!

  Sep 21, 2007 01:27 PM|LINK

  StephenSkinner

  I'm running into the same theme issue. Any resolution to this in the last 2 years?

   

  You have to write a skin with the tag name of your new control and not use <asp:GridView> skin (for example <uc1:NewGridView> ...)

• • Reply
  

  Gaset

  Member

  30 Points

  87 Posts

  Re: Extended GridView lacks Theme!

  Jan 31, 2008 11:48 AM|LINK

   Hi,

   

  I currently have a problem with disabling header (or some controls in header) when grid is empty. Actual behavior is that, when grid is empty, setting HeaderRow.Enabled to false does not disable it on first post-back, but only on the second. I cannot figure out what the problem is.