Re: CustomDataGrid Child controls event problem - weird!?!

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From: Elmer Carķas (elmer_carias_at_hotmail.com)
Date: 12/21/04 

Date: Tue, 21 Dec 2004 09:22:51 -0600

try with that

public override void DataBind()

{

base.DataBind();

firstButton = new ImageButton();

firstButton.CommandName = "First";

firstButton.ImageUrl = firstButtonURL;

firstButton.Command += new CommandEventHandler(OnPageButton_Command);

prevButton = new ImageButton();

prevButton.CommandName = "Prev";

prevButton.ImageUrl = prevButtonURL;

prevButton.Command += new CommandEventHandler(OnPageButton_Command);

nextButton = new ImageButton();

nextButton.CommandName = "Next";

nextButton.ImageUrl = nextButtonURL;

nextButton.Command += new CommandEventHandler(OnPageButton_Command);

lastButton = new ImageButton();

lastButton.CommandName = "Last";

lastButton.ImageUrl = lastButtonURL;

lastButton.Command += new CommandEventHandler(this.OnPageButton_Command);

this.Controls.Add(firstButton);

this.Controls.Add(prevButton);

this.Controls.Add(nextButton);

this.Controls.Add(lastButton);

}

Delete the method CreateChildControls and use DataBind, i hope that can
helps you

Atte. Elmer Carķas
El Salvador, CA
elmer_carias@hotmail.com

"YunusEmre" <emrenews-maillist@yahoo.com> wrote in message
news:urdAXU25EHA.1296@TK2MSFTNGP10.phx.gbl...
> after some more work on the code I came to realize that the call to the
> DataBind() method causes the controls collection of the grid to be
cleared.
> And controls that I put there are also gone. If they are to be cleared
> everytime DataBind() is called, how can I add any other controls that I
need
> on the control?
>
>
> "YunusEmre" <emrenews-maillist@yahoo.com> wrote in message
> news:utXf66u5EHA.2452@TK2MSFTNGP14.phx.gbl...
> > Hi,
> >
> > I am trying to build a Custom Web Control that extends the DataGrid
> > control but I am having problems with the events of the child controls.
As
> > you can see in the following code I have four ImageButtons that I am
> > willing to add to the grid. They will function as page navigators
(First,
> > Previous, Next, Last).
> >
> > I put this control on an aspx page. Set the properties of the control to
> > allow paging, give it the image URLs for the page navigation buttons,
> > write the code to bind data and run. Sth weird happens. The aspx page
uses
> > GridLayout. MyGrid is in the middle of the page. When the application
> > starts the grid is in place, the data is on the grid but the buttons are
> > not there. Even if I force them to render by overriding the "render"
> > method they don't respond. After I click on another button on the page
> > (which has no relation with the grid) or one the buttons that I forced
to
> > render in the overridden render method, my page navigation buttons
appear
> > at the beginning of the page, at the upper left corner of the page. I
> > click one of those on the corner or one of those that are rendered by
me,
> > it does its stuff and they disappear again.
> >
> > I have read many posts on child controls not firing events but I guess
> > this one is weird.
> >
> > 1) How can I get the buttons running everytime on the page
> >
> > 2) How can I place them just above the grid.
> >
> > Here is the code for my customwebcontrol
> >
> > ================================================
> >
> > using System;
> >
> > using System.Data;
> >
> > using System.Drawing;
> >
> > using System.IO;
> >
> > using System.Web.UI;
> >
> > using System.Web.UI.WebControls;
> >
> > using System.ComponentModel;
> >
> >
> >
> > namespace MyGridPrj
> >
> > {
> >
> > [ToolboxData("<{0}:MyGrid runat=server></{0}:MyGrid>"),
> >
> > ToolboxBitmap(@"D:\MyGrid\MyGrid.bmp")]
> >
> > public class MyGrid : System.Web.UI.WebControls.DataGrid,
> > System.Web.UI.INamingContainer
> >
> > {
> >
> >
> > protected override void CreateChildControls()
> >
> > {
> >
> > this.Controls.Clear();
> >
> > base.CreateChildControls ();
> >
> > firstButton = new ImageButton();
> >
> > firstButton.CommandName = "First";
> >
> > firstButton.ImageUrl = firstButtonURL;
> >
> > firstButton.Command += new CommandEventHandler(OnPageButton_Command);
> >
> > prevButton = new ImageButton();
> >
> > prevButton.CommandName = "Prev";
> >
> > prevButton.ImageUrl = prevButtonURL;
> >
> > prevButton.Command += new CommandEventHandler(OnPageButton_Command);
> >
> > nextButton = new ImageButton();
> >
> > nextButton.CommandName = "Next";
> >
> > nextButton.ImageUrl = nextButtonURL;
> >
> > nextButton.Command += new CommandEventHandler(OnPageButton_Command);
> >
> > lastButton = new ImageButton();
> >
> > lastButton.CommandName = "Last";
> >
> > lastButton.ImageUrl = lastButtonURL;
> >
> > lastButton.Command += new
CommandEventHandler(this.OnPageButton_Command);
> >
> > this.Controls.Add(firstButton);
> >
> > this.Controls.Add(prevButton);
> >
> > this.Controls.Add(nextButton);
> >
> > this.Controls.Add(lastButton);
> >
> > }
> >
> > // I have declared this dataSourceTable thing because I want to force
the
> > user of the component to bind a dataTable to the grid, so I manually
bind
> > it to the DataSource property of the base DataGrid class and so I can
use
> > a DataView object to sort,filter ans do stuff like that on the grid. But
> > that is a future concern... First I have to get these buttons running.
> >
> > private static DataTable dataSourceTable;
> >
> > public DataTable DataSourceTable{
> >
> > get
> >
> > {
> >
> > return dataSourceTable;
> >
> > }
> >
> > set
> >
> > {
> >
> > dataSourceTable = value;
> >
> > this.DataSource = dataSourceTable;
> >
> > }
> >
> > }
> >
> >
> >
> > #region Page Navigation Button Declarations
> >
> > private ImageButton firstButton;
> >
> > private string firstButtonURL;
> >
> > [Bindable(true), Category("Paging"), Description("URL of the image to
show
> > as a first page button")]
> >
> > public string FirstButtonURL {
> >
> > get{ return this.firstButtonURL; }
> >
> > set{ this.firstButtonURL = value; }
> >
> > }
> >
> > private ImageButton prevButton;
> >
> > private string prevButtonURL;
> >
> > [Bindable(true), Category("Paging"), Description("URL of the image to
show
> > as a previous page button")]
> >
> > public string PrevButtonURL {
> >
> > get{ return this.prevButtonURL; }
> >
> > set{ this.prevButtonURL = value; }
> >
> > }
> >
> > private ImageButton nextButton;
> >
> > private string nextButtonURL;
> >
> > [Bindable(true), Category("Paging"), Description("URL of the image to
show
> > as a next page button")]
> >
> > public string NextButtonURL {
> >
> > get{ return this.nextButtonURL; }
> >
> > set{ this.nextButtonURL = value; }
> >
> > }
> >
> > private ImageButton lastButton;
> >
> > private string lastButtonURL;
> >
> > [Bindable(true), Category("Paging"), Description("URL of the image to
show
> > as a last page button")]
> >
> > public string LastButtonURL {
> >
> > get{ return this.lastButtonURL; }
> >
> > set{ this.lastButtonURL = value; }
> >
> > }
> >
> > #endregion
> >
> >
> > protected void OnPageButton_Command(object source,
> > System.Web.UI.WebControls.CommandEventArgs e)
> >
> > {
> >
> > switch (e.CommandName) {
> >
> > case "First" : { this.CurrentPageIndex = 0;
> >
> > break;}
> >
> > case "Prev" : { if (this.CurrentPageIndex>0) this.CurrentPageIndex =
> > this.CurrentPageIndex-1;
> >
> > break;}
> >
> > case "Next" : { if (this.CurrentPageIndex<this.PageCount-1)
> > this.CurrentPageIndex = this.CurrentPageIndex+1;
> >
> > break;}
> >
> > case "Last" : { this.CurrentPageIndex = this.PageCount-1;
> >
> > break;}
> >
> > }
> >
> > DataSource = dataSourceTable;
> >
> > DataBind();
> >
> > }
> >
> > }
> >
> >
> >
> > ================================================
> >
> >
>
>

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