RichFaces组件：数据迭代与菜单组件详解

### RichFaces组件：数据迭代与菜单组件详解 在Web开发中，RichFaces提供了丰富的组件来满足各种需求，本文将详细介绍RichFaces的数据迭代组件和菜单组件。 #### 数据迭代组件概述 RichFaces的数据迭代组件涵盖了从基础到复杂的多种类型。基础的 `<a4j:repeat>` 组件不会生成任何标记，而复杂的 `<rich:extendedDataTable>` 则能实现强大的数据展示功能。这些组件都具备部分表格更新的独特特性，允许指定要更新的特定行。组件的外观和感觉可以通过皮肤进行高度定制。 #### 菜单组件介绍 RichFaces的菜单组件丰富多样，包括工具栏、下拉菜单和面板菜单等。虽然上下文菜单未包含在RichFaces 4.0最终版本中，但预计会在后续的4.x更新中添加。 ### 使用 `<rich:toolbar>` `<rich:toolbar>` 用于创建一个水平栏，可以容纳任何JSF组件，包括动作组件。以下是一个简单的示例： ```xml <h:form> <rich:toolbar> <a4j:commandLink id="nyc" value="New York City" actionListener="#{toolbarBean.cityListener}" /> <a4j:commandLink id="sf" value="San Francisco" actionListener="#{toolbarBean.cityListener}" /> <a4j:commandLink id="la" value="Los Angeles" actionListener="#{toolbarBean.cityListener}" /> </rich:toolbar> </h:form> <rich:panel> <a4j:outputPanel ajaxRendered="true"> <h:panelGrid rendered="#{toolbarBean.nyc}"> New York City is the most populous city in the United States, with its metropolitan area ranking among the largest urban areas in the world. For more than a century, it has been one of the world's major centers of commerce and finance. New York City is rated as an alpha world city for its global influences in media, politics, education, entertainment, arts and fashion. The city is also a major center for foreign affairs, hosting the headquarters of the United Nations. </h:panelGrid> <h:panelGrid rendered="#{toolbarBean.sf}"> San Francisco is the fourth most populous city in California and the 14th most populous city in the United States. San Francisco is a popular international tourist destination renowned for its steep rolling hills, an eclectic mix of Victorian and modern architecture, and famous landmarks, including the Golden Gate Bridge, Alcatraz Island, the cable cars, Coit Tower, and Chinatown. </h:panelGrid> <h:panelGrid rendered="#{toolbarBean.la}"> Los Angeles is the largest city in the state of California and the second-largest in the United States. Los Angeles is one of the world's centers of culture, technology, media, business, and international trade. </h:panelGrid> </a4j:outputPanel> </rich:panel> ``` 对应的Bean代码如下： ```java @ManagedBean @ViewScoped public class ToolbarBean implements Serializable { private boolean nyc = true; private boolean sf = false; private boolean la = false; public void cityListener(ActionEvent event){ if (event.getComponent().getId().equals("nyc")) nyc = true; else nyc = false; if (event.getComponent().getId().equals("sf")) sf = true; else sf = false; if (event.getComponent().getId().equals("la")) la = true; else la = false; } // Getters and setters } ``` #### 工具栏的属性和功能 - **宽度和高度属性**：组件提供了 `width` 和 `height` 属性，可用于简单定义基本属性，而无需使用CSS。默认情况下，宽度设置为100%。 - **分隔符**：工具栏上的项目之间可以指定分隔符，有四种内置分隔符可供选择：`none`、`line`、`square` 和 `disc`。也可以使用自定义分隔符图像或创建名为 `itemSeparator` 的facet来放置自定义分隔符。 ```xml <rich:toolbar height="24px" itemSeparator="line"> ``` ```xml <rich:toolbar itemSeparator="/img/ico.gif"> ``` ```xml <rich:toolbar height="24px"> <f:facet name="itemSeparator"> <h:outputText value="|"/> </f:facet> ... <rich:toolbar> ``` - **项目分组**：可以对工具栏上的项目进行分组，并为组指定不同的分隔符和位置。 ```xml <h:form> <rich:toolbar itemSeparator="disc" height="24px"> <a4j:commandLink id="nyc" value="New York City" actionListener="#{toolBarBean.cityListener}" /> <rich:toolbarGroup itemSeparator="square" location="right"> <a4j:commandLink id="sf" value="San Francisco" actionListener="#{toolBarBean.cityListener}" /> <a4j:commandLink id="la" value="Los Angeles" actionListener="#{toolBarBean.cityListener}" /> </rich:toolbarGroup> </rich:toolbar> <h:form> ``` - **放置其他JSF组件**：可以在工具栏中放置任何JSF组件，如图片。 ```xml <rich:panel> <rich:toolbar itemSeparator="line" height="24px"> <h:graphicImage value="/images/states/flag_california.gif" width="24" height="21"/> <h:graphicImage value="/images/states/flag_newyork.gif" width="24" height="21"/> <h:graphicImage value="/images/states/flag_florida.gif" width="24" height="21"/> <h:graphicImage value="/images/states/flag_massachusetts.gif" width="24" height="21"/> </rich:toolbar> </rich:panel> ``` - **附加弹出面板**：可以将 `<rich:popupPanel>` 附加到 `<rich:toolbar>` 上，并在相应的链接点击时激活。 ```xml <rich:toolbar height="24px"> <h:outputLink value="#" id="ll"> <rich:componentControl event="click" operation="show" target="loginPane"> <a4j:param name="event" value="event" noEscape="true" /> <rich:hashParam> <a4j:param noEscape="true" name="top" value="jQuery(#{rich:element('ll')}.parentNode).offset().top + jQuery(#{rich:element('ll')}.parentN ```