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Portlet Modes
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The Portlet 10 and 20 standards define three portlet modes that a compliant portlet container must support: javaxportletPortletModeVIEW, javaxportletPortletModeEDIT, and javaxportletPortletModeHELP Portal vendors and portlet developers may supply custom modes as well VIEW mode refers to the rendered portlet markup that is encountered by the user under normal circumstances Perhaps a clearer name would be normal mode or typical mode, because the word view is also used by developers to review to the view concern of the MVC design pattern EDIT mode refers to the rendered portlet markup that is encountered by the user when selecting custom values for portlet preferences Perhaps a clearer name would be preferences mode Finally, HELP mode refers to the rendered portlet markup that is encountered by the user when seeking help regarding the usage and/or functionality of the portlet Screenshots of a portlet in VIEW, EDIT, and HELP modes are shown in Figures A-1, A-2, and A-3, respectively
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FIGURE A-1 Portlet in VIEW mode
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FIGURE A-2 Portlet in EDIT mode
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Appendix:
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JSF Portlets
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FIGURE A-3 Portlet in HELP mode
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Portlet Window States
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Portals typically manifest the rendered markup of a portlet in a rectangular section of the browser known as a portlet window The Portlet 10 and 20 standards define three window states that a compliant portlet container must support: javaxportletWindowStateNORMAL, javaxportletWindowStateMAXIMIZED, and javaxportletWindowStateMINIMIZED The NORMAL window state refers to the way in which the portlet container displays the rendered markup of a portlet when it can appear on the same portal page as other portlets The MAXIMIZED window state refers to the way in which the portlet container displays the rendered markup of a portlet when it is the only portlet on a page, or when the portlet is to be rendered more prominently than other portlets on a page Finally, the MINIMIZED window state refers to the way in which the portlet container displays a portlet when the markup is not to be rendered
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PART III
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Portlet Preferences
Developers often have the requirement to provide the end user with the ability to personalize the portlet behavior in some way To meet this requirement, the Portlet 10 and 20 standards provide the ability to define preferences for each portlet Preference names and default values can be defined in the WEB-INF/portletxml configuration file Portal end users start out interacting with the portlet user interface in portlet VIEW mode but can switch to portlet EDIT mode in order to select custom preference values
Example Usage
The following example shows how to specify portlet preference names and associated default values in the WEB-INF/portletxml configuration file:
<portlet-app> <portlet> <portlet-preferences> <preference> <name>datePattern</name> <value>MM/dd/yyyy</value> </preference> <preference> <name>unitedStatesPhoneFormat</name> <value>###-###-####</value> </preference> </portlet-preferences> </portlet> </portlet-app>
Part III:
JavaSer ver Faces Tools and Libraries
Inter-Portlet Communication
Inter-portlet communication (IPC) is a technique whereby two or more portlets on a portal page share data in some way In a typical IPC use case, user interactions with one portlet affect the rendered markup of another portlet The Portlet 20 standard provides two techniques to achieve IPC: Public Render Parameters and Server-Side Events The Public Render Parameters technique provides a way for portlets to share data by setting public/shared parameter names in a URL controlled by the portal While this approach is relatively easy to implement, one drawback is that only small amounts of data can be shared Typically, the kind of data that is shared is simply the value of a database primary key The Server-Side Events technique provides a way for portlets to share data using an event-listener design When using this form of IPC, the portlet container acts as broker and distributes events and payload (data) to portlets One requirement of this approach is that the payload must implement the javaioSerializable interface, since it might be sent to a portlet in another WAR running in a different classloader It could be argued that the Portlet 20 approaches for IPC have a common drawback in that they can lead to a potentially disruptive end-user experience This is because they cause either an HTTP GET or an HTTP POST, which results in a full-page refresh Technologies such as ICEfaces Ajax Push can be used to solve this problem See the later section in this appendix ICEfaces Ajax Push and Inter-Portlet Communication for more details Figure A-4 shows a high-level overview of inter-portlet communication Liferay Portal is the most popular and widely downloaded open source portal available The product supports the Portlet 20 standard and includes a built-in Content Management System (CMS) It also ships with over 60 out-of-the-box portlets, including social networking portlets such as Friends, Message Forums, Shared Calendar, Wiki, and Blogs The project home page can be found at wwwliferaycom Liferay, Inc, was of the first portal vendors to provide support for JSF portlets back in May 2005 Since then Liferay has provided support for JSF portlets running technologies including Mojarra, MyFaces, Facelets, and ICEfaces A listing of sample JSF portlets can be found by searching for JSF at wwwliferaycom/web/guest/downloads/community_plugins Figure A-5 shows the Liferay portal in action
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