js小问题

Question

html
---------------
            <asp:TextBox ID="zd" runat="server"  Text="123"></asp:TextBox>
            <img src="images/b249.jpg" onclick="dd();">
            <span id="user_explain"></span>
---------------
js部分
function dd()
{
    
            
    var theName = document.getElementById("zd").value;
    
    if(theName=="123")
    {
    
    var url = "../Ajax/Ajax.aspx?UserName=" + escape(theName);

xmlHttp.open("GET", url, true);

xmlHttp.onreadystatechange = getResult;

xmlHttp.send(null);

    
    }
}function getResult()
 {
 
    
   if (xmlHttp.readyState == 4)
     {
     
        if(xmlHttp.status==200)
        {
       
            if(xmlHttp.responseText=="false")
            {
             
           
               document.getElementById("user_explain").innerHTML='<span style="font-size:12px;color:Red">成功！</span>';
            }
            else if(xmlHttp.responseText=="true")
            {
            
               document.getElementById("user_explain").innerHTML='<span style="font-size:12px;color:Green">失败！</span>';
            }
        
        }}--------------处理页面----------------
 protected void Page_Load(object sender, EventArgs e)
    {
        if (!this.Page.IsPostBack)
        {
            string a = Request.QueryString["UserName"].ToString();
            if(a=="123")
            {
                Response.Write("true");
                 Response.End();
            }
            else
            {
                
                 Response.Write("false");
                 Response.End();
            }        }
    }
------------------想在页面部分显示成功或失败，但是没有反映，我也看不出来是什么地方错了

Answer 1

用的是IE吗?如果是IE的话有脚本错误的时候下面会报的.
如果没报的话,建议你在页面生成之后看页面生成之后的代码,看看是不是控件名字变了.

Answer 2

试了一下没问题。怀疑是：var url = "../Ajax/Ajax.aspx?UserName=" + escape(theName); 
这里的路径问题。

Answer 3

var url = "../Ajax/Ajax.aspx?UserName=" + escape(theName); 
这里的 "../Ajax/Ajax.aspx?UserName="  改成aspx同名文件名试试。如"Default.aspx?UserName="

Answer 4

protected void Page_Load(object sender, EventArgs e) 
    { 
        if (!this.Page.IsPostBack) 
        { 
            string a = Request.QueryString["UserName"].ToString(); 
            if(a=="123") 
            { 
                Response.Write("true"); 
                Response.End(); 
            } 
            else 
            { 
                
                Response.Write("false"); 
                Response.End(); 
            }         } 
    } 
------------------ 这段代码能执行不？

Answer 5

var theName = document.getElementById("zd").value; 
===========
这个取到值了吗？alert一下。如果是vs2005，没取道值，
就改成var theName = document.getElementById("<%=zd.ClientID %>").value; 

Answer 6

你对照这个修改下你的，下面这个测试没问题   
 <script>
    function check_brow()
    {
        var obj=null;
        try
        {
            obj=new ActiveXObject("MSXML2.XMLHTTP");
        }
        catch(e)
        {
            try
            {
                obj=new ActiveXObject("Microsoft.XMLHTTP");
            }
            catch(oc)
            {
                obj=null;
            }
        }
        if ( !obj && typeof XMLHttpRequest != "undefined" )
        {
            obj=new XMLHttpRequest()
        }
        return obj; 
    }
    function bb()
    {
        var name=document.getElementById("TextBox1").value;       
        var url="Default2.aspx?name="+escape(name);
        var xmlhttp=new check_brow();
        xmlhttp.open("get",url,true);
        xmlhttp.onreadystatechange= function()
        {
            if(xmlhttp.readyState==4)
            {
                var result=xmlhttp.responseText;
                alert(result);
            }
        }
        xmlhttp.send(null);    }    </script>
后台
 protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            string name = Request.QueryString["name"];
            if (name + "a" != "a")
            {
                Response.Clear();
                if (name == "123")
                {
                    Response.Write("true");
                }
                else
                {
                    Response.Write("false");                   
                } 
                Response.Flush();
                Response.End();
            }
        }
    }

Answer 7

http://www.code2us.com/CollectBrowse.aspx?ID=87