asp.net 指定字元 輸入的字元、 、

 給 控制項加一些功能。(只能在 ie 下、 瀏覽   )

例如 textBox控制項、 、 、 、

大致 就是：加了個屬性  CheckCode  ，又給 textBox 加了onkeypress 事件 、 把指令碼寫入一個 Sring 、、
   Page.ClientScript.RegisterClientScriptBlock(this.GetType(),"key1",ScriptString,true); 實行 指令碼、 、 、

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using System.Web;
using System.ComponentModel;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace My_CustomWebContrls
{
     [DefaultProperty("Text"),
    ToolboxData("<{0}:MytextBox runat='server' Text=''></{0}:MytextBox>")]                          

   public class MytextBox:TextBox
    {
            public MytextBox()
            {
                this.Load+=new EventHandler(MytextBox_Load);
            }
        
           public String CheckCode { get; set; }
            void  MytextBox_Load(object sender, EventArgs e)
            {

                if (this.Page.ClientScript.IsClientScriptBlockRegistered("key1")) {
                    return;
                }

                Page.ClientScript.RegisterClientScriptBlock(this.GetType(),"key1",ScriptString,true);
                 this.Attributes.Add("onkeypress","return checkinput('"+CheckCode+"')");
            }

            String temp = String.Empty;
            public String ScriptString {

                get {
                    temp += "function checkinput(code) {";
                    temp += "for (var i = 0; i < code.length; i++) {";
                    temp += "if (code.charCodeAt(i) == event.keyCode) {";
                    temp += "return true;}}";
                   
                    temp += "return false;}";
                    return temp;
                }
            }
}
}