ServerControl : RequestProcesser v2

using System;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Security.Permissions;
using System.ComponentModel;
using System.Text;


namespace Bruce.Web.Controls
{
    [AspNetHostingPermission(SecurityAction.Demand, Level = AspNetHostingPermissionLevel.Minimal)]
    [AspNetHostingPermission(SecurityAction.InheritanceDemand, Level = AspNetHostingPermissionLevel.Minimal)]
    [ToolboxData("<{0}:RequestProcesser ID=\"RequestProcesser\" runat=\"server\"></{0}:RequestProcesser>")]
    public class RequestProcesser : CompositeControl
    {
        /// <summary>
        /// JavaScript物件名稱
        /// </summary>
        private string ObjectName = "__RequestProcesser";

        [Browsable(false)]
        [PersistenceMode(PersistenceMode.InnerProperty)]
        public ProcesserAction Action { get; set; }


        [Browsable(false)]
        [PersistenceMode(PersistenceMode.InnerProperty)]
        public ITemplate ContentTemplate { get; set; }


        protected override void OnPreRender(EventArgs e)
        {
            ScriptManager sm = ScriptManager.GetCurrent(this.Page);
            if (sm == null)
            {
                #region OnBeginRequest
                string script = string.IsNullOrEmpty(this.Action.OnBeginRequest.Text.Trim())
                    ? "document.getElementById('" + this.ClientID + "').style.display = 'block';"
                    : string.Format(@"
if((function(){{
{0}
}})() == false){{
    return false;
}}else{{
    document.getElementById('{1}').style.display = 'block';
    return true;
}}", this.Action.OnBeginRequest.Text.Trim(), this.ClientID);
                this.Page.ClientScript.RegisterOnSubmitStatement(this.Page.GetType(), "OnBeginRequest", script);
                #endregion
            }
            else
            {
                StringBuilder script = new StringBuilder();
                script.AppendFormat("var {0} = {{}};{1}", this.ObjectName, Environment.NewLine);

                #region OnBeginRequest

                script.AppendFormat(@"{0}.OnBeginRequest = function() {{
    if((function(){{
{1}
}})() == false){{
        return false;
    }}else{{
        document.getElementById('{2}').style.display = 'block';
        return true;
    }}
}};
//Sys.WebForms.PageRequestManager.getInstance().add_beginRequest({0}.OnBeginRequest);
",
this.ObjectName,
this.Action == null || this.Action.OnBeginRequest == null ? string.Empty : this.Action.OnBeginRequest.Text.Trim(),
this.ClientID);
                this.Page.ClientScript.RegisterOnSubmitStatement(this.Page.GetType(), "OnBeginRequest", "return " + ObjectName + ".OnBeginRequest();");

                #endregion

                #region OnEndRequest
                script.AppendFormat(@"{0}.OnEndRequest = function() {{
    document.getElementById('{1}').style.display = 'none';
    (function(){{
{2}
}})();
}};
Sys.WebForms.PageRequestManager.getInstance().add_endRequest({0}.OnEndRequest);
",
 this.ObjectName,
 this.ClientID,
 this.Action == null || this.Action.OnEndRequest == null ? string.Empty : this.Action.OnEndRequest.Text.Trim());
                #endregion

                this.Page.ClientScript.RegisterStartupScript(this.Page.GetType(), "Processing", script.ToString(), true);
            }


            this.Style["display"] = "none";

            base.OnPreRender(e);
        }

        protected override void CreateChildControls()
        {
            Controls.Clear();
            if (ContentTemplate != null)
            {
                ContentTemplate.InstantiateIn(this);
            }
        }

        public override void DataBind()
        {
            CreateChildControls();
            ChildControlsCreated = true;
            base.DataBind();
        }
    }

    [DesignTimeVisible(false)]
    public class ProcesserAction
    {
        [PersistenceMode(PersistenceMode.InnerProperty),]
        public Literal OnBeginRequest { get; set; }
        [PersistenceMode(PersistenceMode.InnerProperty)]
        public Literal OnEndRequest { get; set; }
    }
}