asp.net中通过form表单submit提交到后台的实例

本文介绍了一个使用图片点击事件触发表单提交的登录页面实现方法,并详细展示了前后端代码。前端利用HTML与JavaScript实现用户输入及表单提交,而后端通过读取请求参数完成登录验证。

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转自:

http://www.cnblogs.com/jianglan/archive/2011/10/14/2212558.html

前台<body>中的代码:

?
< body >
     < div  id = "top" > </ div >
         < form  id = "login"  name = "login"  action = "?Action=Login"  method = "post" >
             < div  id = "center" >
             < div  id = "center_left" ></ div >
             < div  id = "center_middle" >
                 < div  class = "user" >
                     < label >用户名:
                         < input  type = "text"  name = "UserName"  id = "UserName"  />
                     </ label >
                 </ div >
                 < br  />
                 < div  class = "user" >
                     < label >密 码:
                         < input  type = "password"  name = "UserPassword"  id = "UserPassword"  />
                     </ label >
                 </ div >
             </ div >
             < div  id = "center_middle_right" ></ div >
             < div  id = "center_submit" >
                 < div  class = "button" > < img  alt = ""  id = "loginin"  src = "images/dl.gif"  width = "57"  height = "20"  onclick = "document.login.submit()" /> </ div >
                 < div  class = "button" > < img  alt = ""  id = "loginreset"  src = "images/cz.gif"  width = "57"  height = "20"  onclick = "document.login.reset()" /> </ div >
             </ div >
             < div  id = "center_right" ></ div >
             </ div >
         </ form >
     < div  id = "footer" ></ div >
</ body >

通过图片的点击事件,执行form.submit()传递form中的参数。

后台cs代码:

?
protected  string  Action = "" ;
    myBaseClass myData = new  myBaseClass();
    protected  class  UserLoginInfo
    {
        public  string  UserName = "" ;
        public  string  UserPassword = "" ;
    }
    protected  UserLoginInfo _UserLoginInfo = new  UserLoginInfo(); //创建对象
 
    protected  void  Page_Load( object  sender, EventArgs e)
    {
        Init_WebControls();
    }
 
    public  void  Init_WebControls()
    {
        try
        {
            if  (! string .IsNullOrEmpty(Request.QueryString[ "Action" ])) //获取form的Action中的参数
            {
                Action = Request.QueryString[ "Action" ].Trim().ToLower(); //去掉空格并变小写
            }
            switch  (Action)
            {
                case  "login" :
                    if  (! string .IsNullOrEmpty(Request.Form[ "UserName" ]) && ! string .IsNullOrEmpty(Request.Form[ "UserPassWord" ])) //获取form中的参数
                    {
                        _UserLoginInfo.UserName = Request.Form[ "UserName" ].ToString();
                        _UserLoginInfo.UserPassword = Request.Form[ "UserPassWord" ].ToString();
                        string  user = "select 管理员名称,密码 from T_管理员表 where 管理员名称='"  + _UserLoginInfo.UserName + "' and 密码='"  + _UserLoginInfo.UserPassword + "'" ;
                        if  (myData.readDataSet(user).Tables[0].Rows.Count == 1)
                        {
                            Response.Redirect( "Main.aspx" , false ); //防止Response.End 方法终止页的执行
                        }
                        else
                        {
                            Response.Write( "<Script Language=JavaScript>alert('密码或用户名错误,请重试!');</Script>" );
 
                        }
                    }
                    break ;
            }
        }
        catch  (Exception ex)
        {
            throw  new  Exception(ex.Message);
        }
    }
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