基于ASP.NET AJAX框架实现表单验证编程（实践篇）

function OnClickLogin() 
{ 
SetDefaultLoginCompletedCallBack(); 
SetDefaultLogoutCompletedCallBack(); 
SetDefaultFailedCallBack(); 
Sys.Services.AuthenticationService.login(username.value, 
password.value, false,null,null,null,null,"User Context"); 
} 
function OnClickLogout() 
{ 
Sys.Services.AuthenticationService.logout(null, 
null, null, null); 
} 
function OnFailed(error, 
userContext, methodName) 
{ 
DisplayInformation("error:message = " + 
error.get_message()); 
DisplayInformation("error:timedOut = " + 
error.get_timedOut()); 
DisplayInformation("error:statusCode = " + 
error.get_statusCode()); 
} 
function OnLoginCompleted(validCredentials, 
userContext, methodName) 
{ 
password.value = ""; 
if (validCredentials == true) 
{ 
username.value = ""; 
buttonLogin.style.visibility = "hidden"; 
usernameEntry.style.visibility = "hidden"; 
passwordEntry.style.visibility = "hidden"; 
textNotLoggedIn.style.visibility = "hidden"; 
buttonLogout.style.visibility = "visible"; 
textLoggedIn.style.visibility = "visible"; 
DisplayInformation(""); 
} 
else 
{ 
textLoggedIn.style.visibility = "hidden"; 
textNotLoggedIn.style.visibility = "visible"; 
DisplayInformation( 
"Login Credentials Invalid. Could not login"); 
} 
} 
function OnLogoutCompleted(result) 
{ 
usernameEntry.style.visibility = "visible"; 
passwordEntry.style.visibility = "visible"; 
textNotLoggedIn.style.visibility = "visible"; 
buttonLogin.style.visibility = "visible"; 
buttonLogout.style.visibility = "hidden"; 
textLoggedIn.style.visibility = "hidden"; 
} 
function DisplayInformation(text) 
{ 
//…………（省略：负责在页面下方提示行是显示相应信息） 
} 
if (typeof(Sys) !== "undefined") Sys.Application.notifyScriptLoaded();