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if (validCredentials == false){ $get("loginStatus").innerHTML = "Login failed."; } } function onLoginFailed(error, userContext, methodName){ alert(error.get_message()); } //--> </script>
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When the page loads, you B set the default callback function for the service s login method. This isn t a requirement, and it can be overwritten when you call the function this is just another approach for setting the callback. Next, the loginUser function is called when the Login button on the form is clicked. You C retrieve the user credentials and then call the D login method to validate them. If the call succeeds, regardless of whether the credentials are valid, the callback function E onLoginCompleted is called. Passed into the function s first parameter is a Boolean value that indicates if the credentials are valid. Because you specified a URL in the fifth parameter, the user is redirected to that address if validation is successful. If something goes wrong during validation, such as an error on the server, then the F failed callback function is called. We briefly mentioned the login method used to validate the user credentials. Listing 5.23 shows the structure of the method along with brief comments for each parameter.
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Where are the services
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You re calling the authentication service, but where exactly is it The profile and authentication services are built into the framework. In the case of the authentication service, a class called Sys.Services._AuthenticationService contains the implementation for the service. The leading underscore indicates that the class is treated like a private member (there are no real private classes in JavaScript). You interact with this class through the Sys.Services.AuthenticationService variable. This abstraction between the object and the actual implementation class provides a singleton-like access point to the service.
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Listing 5.23 Structure of the login method in the authentication service
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public Object login(Object username, Object password, Object isPersistent, Object customInfo, Object redirectUrl, Object loginCompletedCallback, Object failedCallback, Object userContext); // // // // // // // // username to validate password to validate remember me reserved for future redirect on auth call on success call on failure user context
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This gives you a brief introduction to how the authentication service can be called from JavaScript. Now that you re validating a user and redirecting them to a secure (authenticated users only) page, we can look at another service that adds interaction and personalization for users: profile.
In ASP.NET 2.0, the profile provider stores and retrieves information about a site s users, much like session. However, with profile, because the information is saved to a database, the data is persisted and can be retrieved and configured at any time. This differs from session, where information is erased once the user logs off the site or their session expires. Adding properties to a user profile is as easy as updating web.config with a few extra lines, as shown in listing 5.24.
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Listing 5.24 Adding properties to the users profile
<profile enabled="true"> <properties> <add name="Address1" /> <add name="Address2" /> <add name="City" /> <add name="State" /> <add name="Zip" /> </properties> </profile>
In this example, you add properties that relate to an individual s home address. By default, each property is of type string. The goal in this section will be to read from and update this profile information from the browser in a seamless and nonintrusive manner. Contact information page The contact page we discussed earlier is the perfect candidate for integrating with the profile service. Here, you ll provide a form for the user to update and read their information from their profile, all without the cost of a postback. Figure 5.13 shows the contact form when it s first loaded.
Figure 5.13 The contact information page gives the user a form for reading and updating their profile information.
Using ASP.NET application services
At the top of the page is a link for logging out. When clicked, it logs out the authenticated user and directs them back to the login page:
function logoutUser(){ Sys.Services.AuthenticationService.logout(null, onLogoutCompleted, onLogoutFailed, null); }
The logout function of the authentication service is straightforward. The first parameter optionally takes in the URL for redirecting the user on success. If null is passed, the loginUrl specified in the web.config is used. The callback pattern for success and failure continues with the second and third parameters. The user context is available in the last parameter. Reading from profile To read from a user s profile, you call the service s load function and populate the elements on the page with the results; see listing 5.25.
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