Other Specialized Dojo Widgets in Java

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Form follows function that has been misunderstood Form and function should be one Frank Floyd Wright
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he problem with the standard widgets available in the HTML toolkit (such as text boxes, radio buttons, and so on) isn t that they are ineffective themselves: It s that there just aren t enough of themThere are certain functions for which the standard widgets are a perfect fit And in those functions they find their proper homesThe purpose of a widget is to represent some piece of data or process to the userThe degree to which the widget corresponds to the user s model of that data or process determines it success When widget form and function correspond, the user interface can seem to become almost transparent, and users no longer perceive themselves as working through widgets but as working with their content directlyThis chapter describes a number of Dojo widgets that each perform a specialized function to which they are perfectly matched
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91 What Are Specialized Widgets
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The widgets described in this chapter each have some unique functionThey are not necessarily the most advanced or complicated of the Dojo widgets, but because of their uniqueness they have been grouped togetherThere is no other unifying theme to tie them together as there was with the form widgets described in 7, Dojo Form Widgets, or the layout widgets described in 8, Dojo Layout Widgets However, we re not entering terra incognita here Although the specific function of the widgets might be unique, they way we construct them and use them will be quite
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Other Specialized Dojo Widgets
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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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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
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Items that can appear on a Menu
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PopupMenuItem widgets might have children that are any of the following: - MenuItem - MenuSeparator - PopupMenuItem
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Components of a Menu widget
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921 dijitMenu
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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
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922 dijitMenuItem
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