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It can be argued that moving state away from the server helps provide more scalable systems With fully stateless servers, should you find a bottleneck in server-side processing, you could easily add more servers With this, clients could connect to any available server, because all the required data would be provided by the client; the server wouldn t have to remember anything Because of this, we shall be opting for stateless (or, as-little-state-as-possible) serverside coding This automatically implies that the client-side code will have to identify itself before asking for any processing The server-side code will have first to validate whether the user is a valid one, and authorize to perform whichever process he might ask, and if everything is OK then proceed with the request and send back the produced results To enhance security, both sides (client and server) will have to share a secret ; that is, information known only to both of them A client-side easy secret is the user password; however, we cannot just send it over the web connection, for that would be quite risky We shall recur to creating a special session key that will be used for identification and also for encryption and hashing; we shall see this next Remembering the secret for each client-side user can be done either with a database or by using HTML sessions We ll use the first solution (so our servers won t be 100% state free) but that s the only state data that will be kept at the server

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The dijitMenuSeparator widget is used to organize the display of menu items It creates a gray horizontal line in the list of menu items that separates groups of related menu items It can t receive focus and isn t clickable It does provide a class, dijitMenuSeparatorTop, which can be used to style the link, perhaps changing the color or making it larger for example See Figure 92 for an example of a menu with two separators

[XmlType(Namespace= "http://christiannagelcom/2005/04/CourseManagement/Types")] public class Company { public string Name; public string Street; public string ZIP; public string City; public string Country; } [XmlType(Namespace= "http://christiannagelcom/2005/04/CourseManagement/Types")] public class Person { public string FirstName; public string LastName; public string Title; public string Email; public string Phone; public string Fax; }

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In this section let s consider common operations (such as logging in or changing your password) that require extra care to avoid security risks

9

The Web service method GetCourses is shown in Listing 15-17 This method returns a Course array and requires a string for the category ID as an argument The attribute [XmlElement("Category")] is applied to the argument so that in the XML representation, the argument shows up as Category With the Course array, CourseDate types are included The attribute [XmlInclude] is used to allow the SOAP request to include the Course and CourseDate data types With the implementation of the Web service method, the serviced component QueryCourseControl is used to get an ArrayList of all courses returned The helper method GetCourseArray converts the ArrayList object to a simple Course array type that is returned from the Web service

We ll start with a typical what s wrong with this picture puzzle and consider the following code, taken from the Login Presenter we saw back in 4, Working with Browsers Remember the somewhat meaningless getSomething() call Let s now figure out what it should do (We should point out that we still haven t said what the servlet should return, but that s not the problem here7)

The dijitPopupMenuItem widget allows nested menus to be added to a menuThis widget can then act as a container for other menu elements including MenuItem widgets, MenuSeparator widgets, and even additional PopupMenuItem widgets, which provide the ability to have as many levels of nested menus as desired The standard technique for specifying a popup menu is to include a <SPAN> child element as the label for the popup and then to include a tag representing the widget to be shown when the popup is activated In the case of submenus, the popup widget would be a digitMenu as shown in the following code sample

[WebMethod] [XmlInclude(typeof(Course))] [XmlInclude(typeof(CourseDate))] [return: XmlArrayItem("Course")] [return: XmlArray("CoursesList")] public Course[] GetCourses([XmlElement("Category")] string categoryId) { ArrayList coursesCollection = null; DateTime beginDate = DateTimeToday; DateTime endDate = DateTimeToday + TimeSpanFromDays(200); using (QueryCourseControl queryControl = new QueryCourseControl()) {

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<div dojoType="dijitPopupMenuItem"> <span>Submenu Label</span> <div dojoType="dijitMenu" id="submenu1" style="display: none;"> <div dojoType="dijitMenuItem" onClick="sub1Action()"> Submenu Item One Label</div> <div dojoType="dijitMenuItem" onClick="sub2Action()"> Submenu Item Two Label</div> </div> </div>

loginDisplaysetLoginCallback(new SimpleCallback<Object>() { @Override public void goBack(final Object result) { final String name = LoginFormPresenterthisgetDisplay() getName(); final String pass = LoginFormPresenterthisgetDisplay() getPassword(); loginServicegetSomething(name, pass, new AsyncCallback<String>() { }); } });

EntitiesCategory category = new EntitiesCategory(); categoryId = categoryId; coursesCollection = queryControlGetCourses( CourseSelectionByCategoryAndDates( category, beginDate, endDate)); } return GetCourseArray(coursesCollection); }

The general discussion of the dijitMenu widget is now complete, so let s continue with the standard presentation of the specialized widgets covered in this chapter

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