初试JSF(2)

xml 代码

Listing 3-8. Example of How to Convert a Text Value to a Date/Time Format
<h:outputText value="#{user.startDate}">
<f:convertDateTime type="date" dateStyle="medium"/>
h:outputText>

Jsf 关于日期的格式

Table 3-1. All the Built-in Types for Converting a Date/Time

short   8/24/06
medium    August 24, 2006
long         August 24, 2006
full           Thursday, August 24, 2006

在JSF中 有4中基本类型的事件:

• Value-change events
• Action events
• Data model events
• Phase events

他的生命周期

1. Restore view
2. Apply request values
3. Process validations
4. Update model values
5. Invoke application
6. Render response

一个JSF页面:

xml 代码

<%@ taglib uri="http://java.sun.com/jsf/html" prefix="h" %>
<%@ taglib uri="http://java.sun.com/jsf/core" prefix="f" %>
<f:view>
<h:dataTable var="house" value="#{houses}" rendered="#{houses.rowCount>0}">
<h:column>
<f:facet name="header">
<h:outputText value="Address"/>
f:facet>
<h:outputText value="#{house.address}"/>
h:column>
h:dataTable>
f:view>

注:<h:datatable> 标记data table,为我们显示一个Table; <f:facet>可以命名一个header or footer. #{houses}中的houses不是一个list 而是Data Model</f:facet></h:datatable>

它所生成的Jsp代码(假设有2条数据.)

xml 代码

Listing 3-14. The Generated Output of the Code from Listing 3-13
<table>
<thead>
<tr><th>Addressth>tr>thead>
<tbody id="_id0:tbody_element">
<tr><td>Our New Housetd>tr>
<tr><td>Our 2nd Housetd>tr>tbody>table>

 

 An Example Using Quotations

value = "#{houses.name.equals('test')}"
or
value = '#{houses.name.equals("test")}'

相比之下,我更喜欢前者,因为他看上去更标准化.

Jsf的导航系统中,支持最匹配原则.

xml 代码

Listing 3-20. The JSP for the Add Page
<%@ taglib uri="http://java.sun.com/jsf/html" prefix="h" %>
<%@ taglib uri="http://java.sun.com/jsf/core" prefix="f" %>
<%@ taglib uri="http://myfaces.apache.org/tomahawk" prefix="t" %>
<f:view>
<h1>Add a garage sale to your areah1>
<div class="entry errors"><h:messages globalOnly="true"/>div>
<h:form>
<h:panelGrid columns="2" cellpadding="5" border="0">
<h:outputText value="Address:"/>
<h:inputText value="#{garageSale.house.address}" size="25"/>
CHAPTER 3 n JSF FUNDAMENTALS 79
<h:outputText value="City:"/>
<h:inputText value="#{garageSale.house.city}" size="25"/>
<h:outputText value="State:"/>
<h:inputText value="#{garageSale.house.state}" size="25"/>
<h:outputText value="Start Time:"/>
<t:inputDate value="#{garageSale.house.startTime}" type="both"/>
<h:outputText value="End Time:"/>
<t:inputDate value="#{garageSale.house.endTime}" type="both"/>
<f:facet name="footer">
<h:commandButton type="submit" value="Add House" action="#{garageSale.addHouse}"/>
f:facet>
h:panelGrid>
h:form>
f:view>

其中就用到了tomahawk 包中的日期标签.