[CLOSED] panel-derived custom class with child window - clent rendering order/method

  1. #1

    [CLOSED] panel-derived custom class with child window - clent rendering order/method

    The situation: I have a custom panel that needs its own popup form window. If I was doing this all inline, then I'd just set the window up at the top of the code and then it would be there when the panel is created so I can set up references on the client side. However, I haven't figured out a good way to set it up in the custom class so I can have the window already in existence when the panel's JS constructor fires.

    If I add the window to the panel's Controls collection, it gets rendered after the panel.

    Another possibility is outputting the window to the panel's ConfigOptions, but I can't figure out the necessary options to get that to serialize properly. (I would say this would be the preferred implementation if it's feasible)

    I could always work around by adding a getWindow() JS method that can find the window and reference that since I won't actually need the window until later, but I guess I'm a stickler for trying to do things the 'right' way (assuming I've even determined what that is).

    Any suggestions?
    Last edited by geoffrey.mcgill; Jan 19, 2015 at 5:00 AM.
  2. #2

    What about to add Window to the Form.Controls instead Controls collection of the custom class?
    this.Form.Controls.AddAt(0, myWindow);
    Vladimir Shcheglov
    Sr. Developer
  3. #3
    Well, the class doesn't have a .Form property. Using this.ParentForm.Controls yields the same result as using this.Page.Controls or this.Page.Form.Controls - "The control collection cannot be modified during DataBind, Init, Load, PreRender or Unload phases." and in the constructor, this.Page is null so I can't do anything outside the class there. Also, if I try one of the custom ClientInit event methods, ASP.NET errors out with "Collection was modified; enumeration operation may not execute." (I assume that this is what the friendly debug error on the built-in methods was preventing against.) Basically, it seems to be a big no-no to modify the Controls collection of anything the class doesn't own.

    After poking at it a little further, this seems like it will work:
    I'm not sure that it's feasible in all cases, but I think I should be able to get away with it in this case since I can just attach the handlers to the form buttons when the custom panel constructor fires.

    Is there a way in the .ToScript() method parameters (or on the class itself) to tell it not to include the Ext.net.ResourceMgr.destroyCmp(...); in front? If so, then I could also feed the output to the ConfigOptions.
  4. #4

    What about the following sample? You can always to get window like
    Here is the sample
    <%@ Page Language="C#" %> 
    <%@ Register Assembly="Ext.Net" Namespace="Ext.Net" TagPrefix="ext" %>
    <%@ Import Namespace="System.ComponentModel" %> 
    <script runat="server">
        public class CustomPanel : Ext.Net.Panel
            private Ext.Net.Window myWindow;
            [ConfigOption("myWindow", typeof(LazyControlJsonConverter))]                
            public virtual Ext.Net.Window MyWindow
                    if (this.myWindow == null)
                        this.myWindow = new Ext.Net.Window() { LazyMode = LazyMode.Instance };
                    return this.myWindow;
            public override ConfigOptionsCollection ConfigOptions
                    ConfigOptionsCollection options = base.ConfigOptions;
                    options.Add("myWindow", new ConfigOption("myWindow", new SerializationOptions("myWindow", typeof(LazyControlJsonConverter)), null, this.MyWindow));
                    return options;
        protected void Page_Load( object sender, EventArgs e )
            this.Form.Controls.Add(new CustomPanel()
                ID = "Panel1",
                Title = "CustomPanel",
                MyWindow = 
                    Title = "MyWindow",
                    Hidden = false    
    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
    <html xmlns="http://www.w3.org/1999/xhtml">
    <head id="Head1" runat="server">
        <form id="Form1" runat="server">
            <ext:ResourceManager ID="ResourceManager1" runat="server" />
    Last edited by geoffrey.mcgill; Jan 19, 2015 at 12:08 AM.
    Vladimir Shcheglov
    Sr. Developer
  5. #5
    Thank you - that allows me to output it in the ConfigOptions just fine, which is exactly what I was hoping for. Hopefully someday I'll understand all the json converters and serialization options.

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