HtmlInputButton.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 / HtmlInputButton.cs / 1 / HtmlInputButton.cs

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

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

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

///  
///     
///       The  class defines the methods,
///       properties, and events for the HTML Input Button control. This class allows 
///       programmatic access to the HTML <input type=
///       button>, <input type=
///       submit>,and <input
///       type= 
///       reset> elements on
///       the server. 
///     
/// 
    [ 
    DefaultEvent("ServerClick"),
    SupportsEventValidation,
    ]
    [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)] 
    [AspNetHostingPermission(SecurityAction.InheritanceDemand, Level=AspNetHostingPermissionLevel.Minimal)]
    public class HtmlInputButton : HtmlInputControl, IPostBackEventHandler { 
 
        private static readonly object EventServerClick = new object();
 
        /*
         *  Creates an intrinsic Html INPUT type=button control.
         */
 
        /// 
        /// Initializes a new instance of a  class using 
        ///    default values. 
        /// 
        public HtmlInputButton() : base("button") { 
        }

        /*
         *  Creates an intrinsic Html INPUT type=button,submit,reset control. 
         */
 
        ///  
        /// Initializes a new instance of a  class using the
        ///    specified string. 
        /// 
        public HtmlInputButton(string type) : base(type) {
        }
 

        ///  
        ///    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 an HTML Input Button control is clicked 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) {
            RenderAttributesInternal(writer); 
            base.RenderAttributes(writer);  // this must come last because of the self-closing / 
        }
 
        // VSWhidbey 80882: It needs to be overridden by HtmlInputSubmit
        internal virtual void RenderAttributesInternal(HtmlTextWriter writer) {
            bool submitsProgramatically = Events[EventServerClick] != null;
            if (Page != null) { 
                if (submitsProgramatically) {
                    Util.WriteOnClickAttribute( 
                            writer, this, false /* submitsAutomatically */, submitsProgramatically, 
                            (CausesValidation && Page.GetValidators(ValidationGroup).Count > 0),
                            ValidationGroup); 
                }
                else {
                    Page.ClientScript.RegisterForEventValidation(UniqueID);
                } 
            }
        } 
 

        ///  
        /// Raises the  event.
        /// 
        protected virtual void OnServerClick(EventArgs e) {
            EventHandler handler = (EventHandler)Events[EventServerClick]; 
            if (handler != null) handler(this, e);
        } 
 
        /*
         * Method of IPostBackEventHandler 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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