HtmlButton.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / UI / HtmlControls / HtmlButton.cs / 1 / HtmlButton.cs
                        

                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

/* 
 * HtmlButton.cs 
 *
 * Copyright (c) 2000 Microsoft Corporation 
 */

namespace System.Web.UI.HtmlControls {
    using System.ComponentModel; 
    using System;
    using System.Collections; 
    using System.Web; 
    using System.Web.UI;
    using System.Security.Permissions; 


    /// 
    /// The  
    /// class defines the methods, properties and events for the
    ///  
    /// control. This 
    /// class allows programmatic access to the HTML <button> element
    /// on the server. 
    /// 
    [
    DefaultEvent("ServerClick"),
    SupportsEventValidation, 
    ]
    [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)] 
    [AspNetHostingPermission(SecurityAction.InheritanceDemand, Level=AspNetHostingPermissionLevel.Minimal)] 
    public class HtmlButton : HtmlContainerControl, IPostBackEventHandler {
 
        private static readonly object EventServerClick = new object();


        /* 
         *  Creates an intrinsic Html BUTTON control.
         */ 
 
        /// 
        /// Initializes a new instance of a  class. 
        /// 
        public HtmlButton() : base("button") {
        }
 

        ///  
        ///    Gets or sets whether pressing the button causes page validation to fire. This defaults to True so that when 
        ///          using validation controls, the validation state of all controls are updated when the button is clicked, both
        ///          on the client and the server. Setting this to False is useful when defining a cancel or reset button on a page 
        ///          that has validators.
        /// 
        [
        WebCategory("Behavior"), 
        DefaultValue(true),
        ] 
        public virtual bool CausesValidation { 
            get {
                object b = ViewState["CausesValidation"]; 
                return((b == null) ? true : (bool)b);
            }
            set {
                ViewState["CausesValidation"] = value; 
            }
        } 
 

        [ 
        WebCategory("Behavior"),
        DefaultValue(""),
        WebSysDescription(SR.PostBackControl_ValidationGroup)
        ] 
        public virtual string ValidationGroup {
            get { 
                string s = (string)ViewState["ValidationGroup"]; 
                return((s == null) ? String.Empty : s);
            } 
            set {
                ViewState["ValidationGroup"] = value;
            }
        } 

 
        ///  
        /// Occurs when the user clicks an  control on the
        ///    browser. 
        /// 
        [
        WebCategory("Action"),
        WebSysDescription(SR.HtmlControl_OnServerClick) 
        ]
        public event EventHandler ServerClick { 
            add { 
                Events.AddHandler(EventServerClick, value);
            } 
            remove {
                Events.RemoveHandler(EventServerClick, value);
            }
        } 

 
        ///  
        protected internal override void OnPreRender(EventArgs e) {
            base.OnPreRender(e); 
            if (Page != null && Events[EventServerClick] != null)
                Page.RegisterPostBackScript();
        }
 
        /*
         * Override to generate postback code for onclick. 
         */ 

        ///  
        /// 
        /// 
        protected override void RenderAttributes(HtmlTextWriter writer) {
 
            bool submitsProgramatically = (Events[EventServerClick] != null);
            if (Page != null && submitsProgramatically) { 
                Util.WriteOnClickAttribute( 
                        writer, this, false, true,
                        (CausesValidation && Page.GetValidators(ValidationGroup).Count > 0), 
                        ValidationGroup);
            }

            base.RenderAttributes(writer); 
        }
 
 
        /// 
        /// Raises the  
        /// event.
        /// 
        protected virtual void OnServerClick(EventArgs e) {
            EventHandler handler = (EventHandler)Events[EventServerClick]; 
            if (handler != null) handler(this, e);
        } 
 
        /*
         * Method of IPostBackDataHandler interface to raise events on post back. 
         * Button fires an OnServerClick event.
         */

        ///  
        /// 
        ///  
        void IPostBackEventHandler.RaisePostBackEvent(string eventArgument) { 
            RaisePostBackEvent(eventArgument);
        } 


        /// 
        ///  
        /// 
        protected virtual void RaisePostBackEvent(string eventArgument) { 
            ValidateEvent(UniqueID, eventArgument); 

            if (CausesValidation) { 
                Page.Validate(ValidationGroup);
            }
            OnServerClick(EventArgs.Empty);
        } 
    }
}

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