WebContorl示例--ASCII TextBox

AsciiTextBox代码

using  System;
using  System.Collections.Generic;
using  System.ComponentModel;
using  System.Text;
using  System.Web;
using  System.Web.UI;
using  System.Web.UI.WebControls;

[assembly: WebResource( " WebUIControl.Js.CheckAsciiTextBox.js " ,  " application/x-javascript " )]
namespace  WebUIControl
{
    [DefaultProperty( " Text " )]
    [ToolboxData( " <{0}:AsciiTextBox runat=server></{0}:AsciiTextBox> " )]
     public   class  AsciiTextBox : TextBox
    {
         protected   override   void  OnInit(EventArgs e)
        {
             base .OnInit(e);
             if  ( ! Page.ClientScript.IsClientScriptIncludeRegistered(Page.GetType(),  " AsciiTextBox " ))
            {
                 string  webUrl  =  Page.ClientScript.GetWebResourceUrl(GetType(),  " WebUIControl.Js.CheckAsciiTextBox.js " );
                Page.ClientScript.RegisterClientScriptInclude(Page.GetType(),  " CheckAsciiTextBox " , webUrl);
            }

        }

 

        protected override void OnLoad(EventArgs e)
        {
            base.OnLoad(e);

　　　　　　　//禁用输入法
            this.Attributes.Add("style", "ime-mode:disabled");

　　　　　　　//在TextBox失去焦点时触发事件
             this .Attributes.Add( " onblur " ,  " return CheckAsciiTextBox(' "   +   this .ID  +   " ') " );
        }

    }
}

 

 

 

js代码

// 作为嵌入的资源
function  CheckAsciiTextBox(id)
{
     var  tmp  =   "" ;

    //按ID取得页面控件
     var  input  =  document.getElementById(id);
     for ( var  i = 0 ;i < input.value.length;i ++ )
    {

        //判断字符串，注意charCodeAt和charAt的区别
         if (input.value.charCodeAt(i) > 255 )
        {
            tmp  +=  input.value.charAt(i);
        }
    }
    
     if (tmp  !=   "" )
    {

        //提示用户
        alert( " Contains the following illegal characters\ ""  + tmp +  " \ "" );

        //设置控件获取焦点
        input.focus();
    }
    
     return   false ;
}