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familiar All the widgets in this chapter are descendents of digit_Widget and inherit all the operations of that mother of all widgets This chapter takes the same approach to describing these widgets as have the previous two chapters: Each widget will be described using the same standard layout as introduced in 7 except with the first widget covered in this chapter; it has a little more detail to be included

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Finally, on occasion we shall need to produce a nonce, a cryptographic term that stands for number used once, but which can actually be any kind of random or time-dependent string For server-side coding, we can just use code from the Apache Commons Lang component6

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Like the animals in Animal Farm, all widgets are equal, but some are more equal than othersThat is, some widgets will probably be used much more often than others For this reason and because of involvement of multiple component widgets, some extra time is spent describing the Menu widget One of the most often used features on a web page is navigation Menus are used for executing commands and providing links to other web sites and documents, and they appear on almost every web page on the Net, so you would expect Dojo to have numerous options for creating menus And you would be right The Dojo Menu widget is really a collection of widgets working togetherThe base class for building menus is dijitMenu A Menu widget can have MenuItem widgets as children in addition to two other widgets, dijitMenuSeparator and dijitPopupMenuItem Figure 91 shows the relationship of the components to each other

thisdataGridCourseDatesDataSource = selectedCourseCourseDates; }

The user of the application can add course dates by clicking the button Add Date, the Click event handler of which is shown inListing 15-14, OnAddDate Similar to Listing 15-13, the current selected course is selected from the datagrid dataGridCourses A new form AddDateForm is shown to the user, enabling him to enter the data for the new data, such as the start date, the location, the maximum attendee count, and so on When the user clicks the OK button, the course date is added to the course via the AddCourseDate method

public static String randomCharString() { return RandomStringUtilsrandomAlphabetic(32); }

PopupMenuItem widgets might have children that are any of the following: - MenuItem - MenuSeparator - PopupMenuItem

private void OnAddDate(object sender, SystemEventArgs e) { Course selectedCourse = (Course)courses[thisdataGridCoursesCurrentRowIndex]; AddDateForm form = new AddDateForm(selectedCourse); if (formShowDialog() == DialogResultOK) { selectedCourseAddCourseDate(formCourseDate); thisdataGridCourseDatesDataSource = null; thisdataGridCourseDatesDataSource = selectedCourseCourseDates; } }

The dijitMenu widget is the container for menu elements It is typically displayed either by linking it to a button on a Toolbar widget or by associating it with some other element that can be right-clicked to display the menu Also by using a mouseover event, the menu could be displayed when the user rolls over some other widget on the pageThis is a typical technique employed on some sites

On the other hand, we ll have to whip up our own implementation for client-side coding, because there s no GWT version of RandomStringUtils In any case, it s easy to come up with something like the following

Listing 15-15 shows the handler for the Click event from the Save Course button:OnSaveCourses (see Listing 15-8) Here the serviced component UpdateCourse-Control is used to save the course changes (including the added dates) to the database

The dijitMenuItem widget represents a command or link available on a menu By activating the item, the user selects some function to be performed Menu items can have a text label, an icon, or bothTables 91 and 92 that follow describe the properties and method of this widget

private void OnSaveCourses(object sender, SystemEventArgs e) { Course selectedCourse = (Course)courses[thisdataGridCoursesCurrentRowIndex]; using (UpdateCourseControl cc = new UpdateCourseControl()) { ccAddOrUpdateCourse(selectedCourse); } }

public static String randomCharString() { String r = ""; for (int i = 0; i < 32; i++) { r += (char) ('A' + RandomnextInt(26)); } return r; }

The text containing the displayed label for the item If the menu item should also have an icon displayed with it, this property contains the value for the CSS class describing the icon This property shows whether the item has been deactivated or not Disabled items still display, but clicking them does not trigger their onClick() method

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