|
code
newsgroups
|
|||||||||||||||||||||||
|
|||||||||||||||||||||||
dynamic textbox empty stringtwo register the control, that the don't get lost on the postback! private void registerDynConrol(System.Web.UI.Control control) { ArrayList dynCtlArray = (ArrayList) this.ViewState["dynCtlArray"]; if(dynCtlArray == null) { dynCtlArray = new ArrayList(); this.ViewState.Add("dynCtlArray", dynCtlArray); } dynCtlArray.Add(new Triplet(control.Parent.ID,conntrol.GetType() ..FullName, control.ID)); } and i override the LoadViewState method: protected override void LoadViewState(object savedState) { base.LoadViewState (savedState); ArrayList dynCtlArray = (ArrayList) this.ViewState["dynCtlArray"]; if(dynCtlArray != null) { Control parent; Control control = new Control(); foreach(Triplet ctlInfo in dynCtlArray) { parent = Page.FindControl(ctlInfo.First.ToString()); Type type = Type.GetType("System.Web.UI.WebControls.TextBox, System.Web,Version=1.0.5000.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a", true); control = (Control) Activator.CreateInstance(type); control.ID = ctlInfo.Third.ToString(); parent.Controls.Add(control); string s = ((TextBox) control).Text; } } } this two methods work properly and after the postback, the textbox is stil there INCLUDING the text, which I wrote in before the postback! the only problem is, that i can not read this string out during the LoadViewState- methode: string s = ((TextBox) control).Text; this string s is always "" (empty)!! and I have no clue why? although the string is visible in the textbox, which i recreated in the LoadViewState- methode! thanks for any help You don't need to get low down with LoadViewState. Here's a sample to do
it another way: <%@ Page Language="C#" %> <script runat="server"> ArrayList DynamicControls { get { if (ViewState["DynamicControls"] == null) { ViewState["DynamicControls"] = new ArrayList(); } return (ArrayList)ViewState["DynamicControls"]; } } protected void Page_Load(object sender, EventArgs e) { if (IsPostBack) { for (int i = 0; i < DynamicControls.Count; i++) { string s = (string)DynamicControls[i]; Control c = null; switch (s) { case "t": c = new TextBox(); break; case "d": c = new DropDownList(); break; case "l": c = new Label(); break; } if (c != null) { _ph.Controls.Add(c); } } } } protected void _button1_Click(object sender, EventArgs e) { TextBox t = new TextBox(); _ph.Controls.Add(t); DynamicControls.Add("t"); } protected void _button2_Click(object sender, EventArgs e) { DropDownList d = new DropDownList(); _ph.Controls.Add(d); d.Items.Add("Red"); d.Items.Add("Green"); d.Items.Add("Blue"); DynamicControls.Add("d"); } protected void _button3_Click(object sender, EventArgs e) { Label l = new Label(); _ph.Controls.Add(l); l.Text = DateTime.Now.ToString(); DynamicControls.Add("l"); } </script> <html xmlns="http://www.w3.org/1999/xhtml" > <head runat="server"> <title>Untitled Page</title> </head> <body> <form id="form1" runat="server"> <div> <asp:Button runat=server ID=_button1 Text="Add TextBox" OnClick="_button1_Click" /> <asp:Button runat=server ID=_button2 Text="Add DropDownList" OnClick="_button2_Click" /> <asp:Button runat="server" ID="_button3" Text="Add Label" OnClick="_button3_Click" /> <br /> <asp:PlaceHolder runat="server" ID="_ph"></asp:PlaceHolder> </div> </form> </body> </html> -Brock DevelopMentor http://staff.develop.com/ballen Show quoteHide quote > I create throug LinkButton several dynamic textboxes. I've got two > methods two register the control, that the don't get lost on the > postback! > > private void registerDynConrol(System.Web.UI.Control control) > { > ArrayList dynCtlArray = (ArrayList) this.ViewState["dynCtlArray"]; > if(dynCtlArray == null) > { > dynCtlArray = new ArrayList(); > this.ViewState.Add("dynCtlArray", dynCtlArray); > } > dynCtlArray.Add(new Triplet(control.Parent.ID,conntrol.GetType() > .FullName, control.ID)); > } > > and i override the LoadViewState method: > > protected override void LoadViewState(object savedState) > { > base.LoadViewState (savedState); > ArrayList dynCtlArray = (ArrayList) this.ViewState["dynCtlArray"]; > if(dynCtlArray != null) > { > Control parent; > Control control = new Control(); > foreach(Triplet ctlInfo in dynCtlArray) > { > parent = Page.FindControl(ctlInfo.First.ToString()); > Type type = Type.GetType("System.Web.UI.WebControls.TextBox, > System.Web,Version=1.0.5000.0, Culture=neutral, > PublicKeyToken=b03f5f7f11d50a3a", true); > control = (Control) Activator.CreateInstance(type); > control.ID = ctlInfo.Third.ToString(); > parent.Controls.Add(control); > string s = ((TextBox) control).Text; > } > } > } > this two methods work properly and after the postback, the textbox is > stil > there INCLUDING the text, which I wrote in before the postback! the > only > problem is, that i can not read this string out during the > LoadViewState- > methode: > string s = ((TextBox) control).Text; > this string s is always "" (empty)!! and I have no clue why? although > the > string is visible in the textbox, which i recreated in the > LoadViewState- > methode! > thanks for any help > 
Other interesting topics
Protected Shadows With Events.
Page.RegisterClientScriptBlock() is not working ..... :-( How do I access HTML controls from the code behind? e.Item.Cells.Count in UpdateCommand event of Datagrid Binding Data to IE Treeview control How to filter two combos on grid clientside How do I create an "event" to deal with textarea and DataGrid? Can a User Control display a pdf or static html file? ASP.NET Book Recommendation Datagrid problems |
|||||||||||||||||||||||
