Question

Ajax调用后台方法,获得返回值的后台代码

Answer 1

前台，后台，JS，代码如下：

js
<script type="text/javascript">

//ajax验证登陆名是否存在
var xmlHttp;
//创建XMLHttpRequest对象
function createXMLHttpRequest()
{
try
{
xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
}
catch(e)
{
xmlHttp=new XMLHttpRequest();
}
}
function checkResult()
{
if(xmlHttp.readyState==4)
{

if(xmlHttp.status==200)
{
var result=xmlHttp.responseText;
var div_show=document.getElementById("nickNameValidMsg");
if(result=="1")
{
div_show.innerText="此商户名已被注册！";
}
if(result=="0")
{
div_show.innerText="此商户名可用！";
}
}
}
}

function num()
{
var div_show=document.getElementById("nickNameValidMsg");
var name=document.getElementById("txtBusiness_Name").value;
if(name!="")
{
createXMLHttpRequest(); //创建XMLHttpRequest对象
xmlHttp.onreadystatechange=checkResult;
xmlHttp.open("get","Disposal.aspx?name="+escape(name),true);//解决乱码用escape
xmlHttp.send();
}
else
{
div_show.innerText="请输入商户名";
}
}
</script>

控件
<div class="ListContentRowsLi" style="width:auto">
<asp:TextBox ID="txtBusiness_Name" CssClass="loginText_Code" runat="server" onblur="num();"></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ControlToValidate="txtBusiness_Name" ErrorMessage="*" ValidationGroup="a" ></asp:RequiredFieldValidator>
<asp:Label ID="nickNameValidMsg" runat="server" ></asp:Label>
</div>

新的页面 后台

//检查商户名是否存在
protected void Page_Load(object sender, EventArgs e)
{

string name = Server.UrlDecode(Request.QueryString["name"]);//商户名称

if (Business.IsYesBusiness(name))//判断返回是true，还是false
{
Response.Write("1");
Response.End();
}
else
{
Response.Write("0");
Response.End();
}
}