rmack005 / ModernButton.cs
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ASP.Net Button control that renders with Button tag instead of input

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using System;

using System.ComponentModel;

using System.Web;

using System.Web.UI;

using System.Linq;

 

namespace Public.Html.Controls

{

    public enum ButtonType

    {

        Submit,

        Reset,

        Button

    } ;

 

    [ToolboxData("<{0}:Button runat=server></{0}:Button>")]

    [ParseChildren(false)]

    [PersistChildren(true)]

    public class Button : System.Web.UI.WebControls.WebControl, IPostBackDataHandler

    {

        //Fields

        private static readonly object EventClick = new object();

        private static readonly object EventCommand = new object();

        private static readonly object EventValueChanged = new object();

 

        //Events        

        public event EventHandler Click

        {

            add { Events.AddHandler(EventClick, value); }

            remove { Events.RemoveHandler(EventClick, value); }

        }

 

        public event EventHandler ValueChanged

        {

            add { Events.AddHandler(EventValueChanged, value); }

            remove { Events.RemoveHandler(EventValueChanged, value); }

        }

 

        public event System.Web.UI.WebControls.CommandEventHandler Command

        {

            add { Events.AddHandler(EventCommand, value); }

            remove { Events.RemoveHandler(EventCommand, value); }

        }

 

        public Button()

            : base(HtmlTextWriterTag.Button)

        {

        }

 

        #region Properties

 

        [Category("Behavior")]

        [DefaultValue("")]

        public string CommandArgument

        {

            get

            {

                return ViewState["CommandArgument"] as string ?? string.Empty;

            }

            set

            {

                ViewState["CommandArgument"] = value;

            }

        }

 

        [Category("Behavior")]

        [DefaultValue("")]

        public string CommandName

        {

            get

            {

                return ViewState["CommandName"] as string ?? string.Empty;

            }

            set

            {

                ViewState["CommandName"] = value;

            }

        }

 

        [Category("Behavior")]

        [DefaultValue("")]

        public virtual string PostBackUrl

        {

            get

            {

                return ViewState["PostBackUrl"] as string ?? string.Empty;

            }

            set

            {

                ViewState["PostBackUrl"] = value;

            }

        }

 

        [Category("Validation")]

        [DefaultValue(true)]

        public virtual bool CausesValidation

        {

            get

            {

                var causesValidation = ViewState["CausesValidation"];

                return (causesValidation == null) ? true : (bool)causesValidation;

            }

            set

            {

                ViewState["CausesValidation"] = value;

            }

        }

 

        [Category("Validation")]

        [DefaultValue("")]

        public virtual string ValidationGroup

        {

            get

            {

                return ViewState["ValidationGroup"] as string ?? string.Empty;

            }

            set

            {

                ViewState["ValidationGroup"] = value;

            }

        }

 

        [Category("Behavior")]

        [DefaultValue("")]

        public string Value

        {

            get

            {

                return ViewState["Value"] as string ?? string.Empty;

            }

            set { ViewState["Value"] = value; }

        }

 

        [Category("Behavior")]

        [DefaultValue(ButtonType.Button)]

        [Description("Defines the type of the button.")]

        public ButtonType ButtonType

        {

            get

            {

                var obj = ViewState["ButtonType"];

                return (obj == null) ? ButtonType.Button : (ButtonType) obj;

            }

            set { ViewState["ButtonType"] = value; }            

        }

 

        #endregion

 

        #region Methods

 

        protected override void AddAttributesToRender(HtmlTextWriter writer)

        {

            base.AddAttributesToRender(writer);

 

            if(!string.IsNullOrEmpty(Value))

                writer.AddAttribute(HtmlTextWriterAttribute.Value, Value);

 

            writer.AddAttribute(HtmlTextWriterAttribute.Type, ButtonType.ToString().ToLower());

 

            var postBackOptions = GetPostBackOptions();

 

            if(postBackOptions == null)

                throw new Exception("postBackOptions must not be null");

 

            if (postBackOptions.TargetControl == this)

            {

                writer.AddAttribute(HtmlTextWriterAttribute.Name, ClientID);

            }

 

            if (Page != null)

            {

                Page.ClientScript.RegisterForEventValidation(postBackOptions);

            }

        }

 

        protected virtual PostBackOptions GetPostBackOptions()

        {

            var options = new PostBackOptions(this, string.Empty) { ClientSubmit = false };

 

            if (Page != null)

            {

                if (CausesValidation && (Page.GetValidators(ValidationGroup).Count > 0))

                {

                    options.PerformValidation = true;

                    options.ValidationGroup = ValidationGroup;

                }

 

                if (!String.IsNullOrEmpty(PostBackUrl))

                {

                    options.ActionUrl = HttpUtility.UrlPathEncode(ResolveClientUrl(PostBackUrl));

                }

            }

 

            return options;

        }

 

        protected void OnClick()

        {

            var handler = (EventHandler)Events[EventClick];

            if (handler != null) handler(this, new EventArgs());

        }

 

        protected void OnValueChanged()

        {

            var handler = (EventHandler)Events[EventValueChanged];

            if (handler != null) handler(this, new EventArgs());

        }

 

        protected void OnCommand(string commandName, string commandArgument)

        {

            var handler = (System.Web.UI.WebControls.CommandEventHandler)Events[EventCommand];

            var args = new System.Web.UI.WebControls.CommandEventArgs(commandName, commandArgument);

 

            if (handler != null) handler(this, args);

 

            RaiseBubbleEvent(this, args);

        }

 

        protected override void OnPreRender(EventArgs e)

        {

            base.OnPreRender(e);

 

            if (Page != null)

                Page.RegisterRequiresPostBack(this);

        }

 

        protected override void LoadControlState(object savedState)

        {

            var pair = savedState as Pair;

            var str = savedState as string;

 

            if(pair != null)

            {

                base.LoadControlState(pair.First);

                Value = (string) pair.Second;

            }

 

            if(str != null)

            {

                Value = str;

            }

        }

 

        protected override object SaveControlState()

        {

            var baseState = base.SaveControlState();

 

            if (baseState == null)

                return string.IsNullOrEmpty(Value) ? null : Value;

            

            return new Pair(baseState, Value);

        }

 

        #endregion

 

        #region IPostBackDataHandler

 

        public bool LoadPostData(string postDataKey, System.Collections.Specialized.NameValueCollection postCollection)

        {

            if (string.IsNullOrEmpty(postDataKey))

                throw new ArgumentOutOfRangeException("postDataKey");

 

            if (postCollection == null)

                throw new ArgumentNullException("postCollection");

 

            if (postCollection.AllKeys.Contains(ClientID))

            {

                var existingValue = Value;

                Value = postCollection[ClientID];

 

                OnClick();

 

                if(!string.IsNullOrEmpty(CommandName))

                    OnCommand(CommandName, CommandArgument);

 

                return (existingValue.Equals(Value, StringComparison.Ordinal));

            }

 

            return false;

        }

 

        public void RaisePostDataChangedEvent()

        {

            OnValueChanged();

        }

 

        #endregion

    }

}
nottrobin commented

How do I use this?

I included this class in my project, but I can't work out how to reference a Public.Html.Controls.Button rather than a System.Web.UI.WebControls.Button inside my .ascx file - asp:button always seems to create a System.Web.UI.WebControls.Button.

jdnichollsc commented

Server Error in '/' Application.

Page.IsValid cannot be called before validation has taken place. It should be queried in the event handler for a control that has CausesValidation=True and initiated the postback, or after a call to Page.Validate.

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