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POHow to add dynamically created buttons to a dynamically created table?
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  1. POHow to add dynamically created buttons to a dynamically created table?
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    copied!<p>A question has been really bugging me lately. I hope you would help me.</p> <p>I want to create a table after a user clicks a button. On each row in the first cell I want to add a button. Unfortunately, the table buttons fail to fire an event. Could you tell me how to do it or where my mistake is? I have used <a href="http://www.codeproject.com/kb/aspnet/dynamiccontrolsByLeon.aspx" rel="nofollow">this article</a> to create the following example code.</p> <pre><code>&lt;asp:PlaceHolder ID="placeHolderForTable" runat="server"&gt; &lt;/asp:PlaceHolder&gt; &lt;asp:Button ID="btnCreateTbl" runat="server" Text="Create Table"/&gt; &lt;asp:Label ID="lblResult" runat="server" /&gt; </code></pre> <p>Code:</p> <pre><code>private struct ControlInfo { public string ID; public string Type; public int Border; public HtmlTableRow[] TblRows; public HtmlTableCell[] TblCells; public int Width; public int Height; } protected void Page_Load(object sender, EventArgs e) { btnCreateTbl.Click+=new EventHandler(BtnClick); if (this.IsPostBack) this.RecreatePersistedControls(); }//end Page_Load //Call CreateControl for each persisted control private void RecreatePersistedControls() { ArrayList al = (ArrayList)this.Session["DynamicControls"]; if (al != null) foreach (ControlInfo ci in al) this.CreateControl(ci); }//end RecreatePersisterdControls method //Create control specified by ControlInfo structure private Control CreateControl(ControlInfo ci) { Control ctl = null; switch (ci.Type) { case "Button": ctl = new Button(); ctl.ID = ci.ID; ((Button)ctl).Text = "Edit"; ((Button)ctl).Click+=new EventHandler(this.DoNothing); if (this.placeHolderForTable.FindControl("tblResult") != null) { for (int r = 0; r &lt; ci.Height; r++) { if (this.placeHolderForTable.FindControl("tblResult").FindControl("tr" + (r + 1)) != null &amp;&amp; (r+1).ToString()==ci.ID[7].ToString()) if (this.placeHolderForTable.FindControl("tblResult").FindControl("tr" + (r + 1)).FindControl("td" + (r + 1) + "1") != null) if(this.placeHolderForTable.FindControl("tblResult").FindControl("tr" + (r + 1)).FindControl("td" + (r + 1) + "1").FindControl(ctl.ID)==null) this.placeHolderForTable.FindControl("tblResult").FindControl("tr" + (r + 1)).FindControl("td" + (r + 1) + "1").Controls.Add(ctl); } } break; case "HtmlTable": ctl = new HtmlTable(); ctl.ID = ci.ID; ((HtmlTable)ctl).Border = ci.Border; for (int r = 0; r &lt; ci.Height; r++) { HtmlTableRow row = ci.TblRows[r]; row.ID = "tr" + (r + 1); for (int c = r * ci.Width; c &lt; r * ci.Width+2; c++) { ci.TblCells[c].ID="td"+(r+1)+(c%2+1); row.Cells.Add(ci.TblCells[c]); } ((HtmlTable)ctl).Rows.Add(row); } if(this.placeHolderForTable.FindControl(ctl.ID)==null) this.placeHolderForTable.Controls.Add(ctl); break; default: return null; } return ctl; }//end CreateControl method //Create ControlInfo structure and persist it to Session private ControlInfo PersistControl(string id, string type, int border, HtmlTableRow[] tblRows, HtmlTableCell[] tblCells, int width, int height) { ControlInfo ci = new ControlInfo(); ci.ID = id; ci.Type = type; ci.Border = border; ci.TblRows = tblRows; ci.TblCells = tblCells; ci.Width = width; ci.Height = height; ArrayList al = (ArrayList)this.Session["DynamicControls"]; if (al == null) al = new ArrayList(); al.Add(ci); this.Session["DynamicControls"] = al; return ci; }//end PersistControl method private void BtnClick(object sender, EventArgs e) { int cellIx=0,rowIx=0; HtmlTableRow tr1 = new HtmlTableRow(); HtmlTableCell td11 = new HtmlTableCell(); tr1.Cells.Add(td11); HtmlTableCell td12 = new HtmlTableCell(); td12.InnerText = "td12"; tr1.Cells.Add(td12); HtmlTableRow tr2 = new HtmlTableRow(); HtmlTableCell td21 = new HtmlTableCell(); tr2.Cells.Add(td21); HtmlTableCell td22 = new HtmlTableCell(); tr2.Cells.Add(td22); td22.InnerText = "td22"; HtmlTableRow []arrRows=new HtmlTableRow[2]; arrRows[rowIx++]=tr1; arrRows[rowIx++]=tr2; HtmlTableCell []arrCells=new HtmlTableCell[4]; arrCells[cellIx++]=td11; arrCells[cellIx++]=td12; arrCells[cellIx++]=td21; arrCells[cellIx++]=td22; ControlInfo ci = PersistControl("tblResult", "HtmlTable", 3, arrRows, arrCells, 2, 2); HtmlTable tblResult = (HtmlTable)CreateControl(ci); ci = PersistControl("btnEdit1", "Button", 0, arrRows, arrCells, 2, 2); Button btnEdit1 = (Button)CreateControl(ci); ci = PersistControl("btnEdit2", "Button", 0, arrRows, arrCells, 2, 2); Button btnEdit2 = (Button)CreateControl(ci); } public void DoNothing(object sender, EventArgs e) { lblResult.Text = (sender as HtmlButton).ID + " done"; } </code></pre>
 

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