目的：在aspx页面的一个文本框失去焦点时，触发一个查询TABLE的动作。
1. page_load 添加 txtInternal.Attributes["onfocus"] = "MyJsFunc()";
2. 页面javascript添加：
<script ...>
...
function MyJsFunc()
{
var txt = document.getElementById("txtLotID").value;
PageMethods.MyMethod(txt,OnSuccess);
}
function OnSuccess(value)
{
document.getElementById("txtInternal").innerText=value;
//$get('<%= Label1.ClientID %>').innerText = result=="false" ? "该用户已注册" : "OK";
}
...
<script>
3. html添加：在div标签里头，form外头
<div>
<asp:ScriptManager ID="ScriptManager1" runat="server" EnablePageMethods="true"></asp:ScriptManager>
<form>
</form>
</div>
4.aspx.cs文件：
[System.Web.Services.WebMethod] //要在客户端使用服务器方法，必须加上这个Attribute
public static string MyMethod(string str_lotid) //方法必须是static
{
LabelView labelview = new LabelView();
labelview.LotID = str_lotid;
HttpResponse resp = System.Web.HttpContext.Current.Response;
ProcessGetLabelViewByLotID getLabelbylotid = new ProcessGetLabelViewByLotID();
getLabelbylotid.LabelView = labelview;
try
{
getLabelbylotid.Invoke();
}
catch (Exception ex)
{
string str_url;
str_url = "ErrorPage.aspx?ErrorMessage=" + HttpUtility.UrlEncode(ex.Message);//Server.urlencode(ex.Message);
resp.Redirect(str_url);
}
string str = getLabelbylotid.LabelView.PartName.ToString();
return str;
}
备注：一定要有OnSuccess
