如何用js调用服务器端方法。首先服务器端方法的格式如下
[System.Web.Services.WebMethod]
public static void serverMethod(string url)
{
WebClient wc = new WebClient();
StringBuilder postData = new StringBuilder();
postData.Append("multigateway=" + m_username);
//下面是GB2312编码
byte[] sendData = Encoding.GetEncoding("GB2312").GetBytes(postData.ToString());
wc.Headers.Add("Content-Type", "application/x-www-form-urlencoded");
wc.Headers.Add("ContentLength", sendData.Length.ToString());
byte[] recData = wc.UploadData(url, "POST", sendData);
}
标记为红色的很重要，是服务器方法的强制要求，这样才能被客户端直接调用
客户点js调用如下
<script type="text/javascript">
function CallServerMethod(para) {
PageMethods.SetMultiGatwayMessage(para，onsuccess);
}
function onsuccess(callbackValue) //调用完后台方法后回调函数，获取后台返回的参数
{
}
</script>
最后前端网页中千万别忘记添加ScriptManager 并把enablePageMethods属性设为true
<body>
<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server" EnablePageMethods="true"></asp:ScriptManager>
</div>
</form>
</body>