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RichFaces - 输入组件

到目前为止，我们已经了解了很多有关 RichFaces 的不同 AJAX 组件以及名为"Skin"的新功能。在本章中，我们将学习 RichFaces 提供的不同"Rich"组件，以便开发现代 Web 应用程序。以下是"RichFaces"提供的不同输入组件。

<rich:inplaceInput>

Rich inplaceInput 提供了创建可编辑文本框(而不是普通输入文本框)的机会。在下面的示例中，我们将使用此组件创建一个可编辑文本框。创建一个 xhtml 文件并将其命名为"richinplaceInput.xhtml"。在该文件中写入以下代码。

<?xml version = "1.0" encoding = "UTF-8"?>  
<!DOCTYPE html> 
<html xmlns = "http://www.w3.org/1999/xhtml"   
   xmlns:h = "http://java.sun.com/jsf/html"   
   xmlns:f = "http://java.sun.com/jsf/core"   
   xmlns:ui = "http://java.sun.com/jsf/facelets"   
   xmlns:a4j = "http://richfaces.org/a4j"   
   xmlns:rich = "http://richfaces.org/rich"> 
   
   <h:head> 
      <title>TODO supply a title</title> 
   </h:head> 
    
   <h:body> 
      <f:view></f:view>   
      <h:form>   
         <rich:inplaceInput  value = "#{managedBean.message}"   
            defaultLabel = "Enter Your Name"/> 
      </h:form>  
   </h:body>
   
</html>

保存此文件并运行。以下是浏览器中的输出。

输入您的姓名

继续在该文本框中输入您选择的任何内容并按回车键。此标签还提供内联编辑选项。编辑后将输出以下内容。

内联编辑选项

<rich: inplaceSelect>

这是 RichFaces 提供的另一个输入标记，用户可以从下拉列表中选择一个输入值，该列表也是内联的并且本质上是可编辑的。我们需要从内部 bean 类填充下拉列表。请创建一个"xhtml"文件并将其命名为"richinplaceSelectExample.xhtml"。将以下代码片段放入该文件中。

<?xml version = "1.0" encoding = "UTF-8"?> 
<!DOCTYPE html> 
<html xmlns = "http://www.w3.org/1999/xhtml"   
   xmlns:h = "http://java.sun.com/jsf/html"   
   xmlns:f = "http://java.sun.com/jsf/core"   
   xmlns:ui = "http://java.sun.com/jsf/facelets"   
   xmlns:a4j = "http://richfaces.org/a4j"   
   xmlns:rich = "http://richfaces.org/rich"> 
   
   <h:head> 
      <title>TODO supply a title</title>
   </h:head> 
    
   <h:body> 
      <h:form> 
         <rich:inplaceSelect value = "#{subject.subjectName}" defaultLabel = "Click to Select Country">
            <f:selectItems value = "#{subject.SubJectList()}"></f:selectItems>   
         </rich:inplaceSelect> 
      </h:form>     
   </h:body>
   
</html>

在上面的例子中，我们将从后端填充下拉选项。这是名为"subject.java"的 bean 类。

import java.util.ArrayList; 
import java.util.List; 
import javax.faces.bean.ManagedBean; 
import javax.faces.bean.ManagedProperty; 
import javax.faces.bean.RequestScoped;   

@ManagedBean 
@RequestScoped 

public class Subject { 
   String SubjectName;  
   public Subject() { 
   }  
   public Subject(String SubjectName) { 
      this.SubjectName = SubjectName; 
   } 
   public List<String> SubJectList() {  
      //要呈现的列表
      ArrayList<String> list = new ArrayList<>();   
      
      list.add("JAVA");   
      list.add("DOTNET");   
      list.add("COBOL");   
      list.add("AJAX");   
      list.add("JAVA SCRIPT");   
      return list;   
   }    
   public String getSubjectName() { 
      return SubjectName; 
   } 
   public void setSubjectName(String SubjectName) { 
      this.SubjectName = SubjectName; 
   } 
}

我们通过列表传递的所有主题名称都将显示在下拉菜单中。以下是运行此应用程序后的输出。

下拉菜单

<rich:SuggestionBox>

<rich:SuggestionBox> 用于根据输入文本框中提供的输入向用户提供建议。此标记在内部创建一个 JS 事件并调用所需的 istener 类以从后端提供建议。不幸的是，此 suggestionsBox 和 ComboBox 都合并为 RichFaces 4 中名为"<rich:autocomplete>"的单独标记，但是，如果您使用的是 RichFaces 3，则可以使用此标记，如下所示。

<h:inputText id = "city" value = "#{capitalsBean.capital}" /> 
<rich:suggestionbox for = "city" var = "result" 
   suggestionAction = "#{capitalsBean.autocomplete}"> 
   
   <h:column> 
      <h:outputText value = "#{result.name}" /> 
   </h:column> 
</rich:suggestionbox>

其中"capitalsBean"将是一个具有不同参数的 Java 类，名为"autocomplete"的侦听器类将在运行时设置"capital"实例变量的值并提供所需的输出。强烈建议使用 RichFaces 4"autocomplete"，而不是使用此标记，因为设计人员不再支持此标记。

<rich:comboBox>

<rich:comboBox> 的工作原理与 <rich:suggestionBox> 完全相似，但是，此标记不是调用侦听器类，而是将一些建议预先呈现到客户端浏览器中，这些建议彼此交互并提供所需的输出。与 <rich:sugegstionBox> 一样，此功能在新版本中也已弃用，另一个名为"<rich:autocomplete>"的标记如下代码所示。

创建一个单独的文件，并将其命名为"richAutoComplete.xhtml"。将以下代码放入该文件中。

<?xml version = "1.0" encoding = "UTF-8"?>  
<!DOCTYPE html> 
<html xmlns = "http://www.w3.org/1999/xhtml"   
   xmlns:h = "http://java.sun.com/jsf/html"   
   xmlns:f = "http://java.sun.com/jsf/core"   
   xmlns:ui = "http://java.sun.com/jsf/facelets"   
   xmlns:a4j = "http://richfaces.org/a4j"   
   xmlns:rich = "http://richfaces.org/rich"> 
   
   <h:head></h:head> 
   
   <h:body> 
      <h:form id = "form"> 
         <h:form id = "form"> 
            <rich:autocomplete mode = "cachedAJAX" minChars = "2" 
            autocompleteMethod = "#{autoComplete.SubJectList()}" /> 
         </h:form> 
      </h:form> 
   </h:body>
   
</html>

在上面的例子中，我们通过 RichFaces 的自动完成功能填充主题列表。创建另一个 Java 类并将其命名为"autoComplete.java"。

import java.util.ArrayList; 
import java.util.List; 
import javax.faces.bean.ManagedBean; 
import javax.faces.bean.RequestScoped;  

@ManagedBean 
@RequestScoped 

public class autoComplete { 
   public autoComplete(){} 
   private List<String> autoCompleteList=new ArrayList<>(); 
   
   public List<String> SubJectList() {   
      //ArrayList<String> list = new ArrayList<>();   
      autoCompleteList.add("JAVA");   
      autoCompleteList.add("DOTNET");   
      autoCompleteList.add("COBOL");   
      autoCompleteList.add("AJAX");   
      autoCompleteList.add("JAVA SCRIPT");   
      return autoCompleteList;   
   }   
   public List<String> getAutoCompleteList() {
      return autoCompleteList; 
   }  
   public void setAutoCompleteList(List<String> autoCompleteList) { 
      this.autoCompleteList = autoCompleteList; 
   } 
}

上述文件充当 bean 类，SubjectList() 是方法，它实际上将响应呈现给浏览器。在 <SuggestionBox>、<ComboBox> 标签中，我们需要实现侦听器类，但是，对于 <autocomplete> 标签，此侦听器类的创建已自动完成，这对开发人员来说更容易。上述代码将在浏览器中产生以下输出。

Subject List

<rich:inputNumberSlider>

这是一个非常简单的标签，可帮助开发人员根据数字间隔创建数字滑块。创建"inputNumberSlider.xhtml"文件并将以下代码放入其中。

<?xml version = "1.0" encoding = "UTF-8"?>  
<!DOCTYPE html> 
<html xmlns = "http://www.w3.org/1999/xhtml"   
   xmlns:h = "http://java.sun.com/jsf/html"   
   xmlns:f = "http://java.sun.com/jsf/core"   
   xmlns:ui = "http://java.sun.com/jsf/facelets"   
   xmlns:a4j = "http://richfaces.org/a4j"
   xmlns:rich = "http://richfaces.org/rich"> 
   
   <h:head></h:head> 
   
   <h:body> 
      <h:form>   
         <h:outputText value = "Slide Bar example"></h:outputText>   
         <rich:inputNumberSlider    
            minValue = "1"   
            maxValue = "10"   
            showArrows = "false"   
            showTooltip = "false"   
            step = "1">   
         </rich:inputNumberSlider>   
      </h:form>  
   </h:body>
   
</html>

在上面的例子中，属性非常具有描述性。上面的代码将在浏览器中产生以下输出。

Slide Bar Example

<rich:Calendar>

顾名思义，此标签将有助于在浏览器中创建日历。创建一个单独的文件并将其命名为"richCalendar.xhtml"。将以下代码放入其中。

<?xml version = "1.0" encoding = "UTF-8"?>  
<!DOCTYPE html> 
<html xmlns = "http://www.w3.org/1999/xhtml"   
   xmlns:h = "http://java.sun.com/jsf/html"   
   xmlns:f = "http://java.sun.com/jsf/core"   
   xmlns:ui = "http://java.sun.com/jsf/facelets"   
   xmlns:a4j = "http://richfaces.org/a4j"   
   xmlns:rich = "http://richfaces.org/rich"> 
   
   <h:head></h:head> 
   
   <h:body> 
      <h:form>   
         <h1>Calendar</h1>   
         <rich:calendar value = "#{calendarBean.selectedDate}"   
            locale = "#{calendarBean.locale}"   
            popup = "#{calendarBean.popup}"   
            datePattern = "#{calendar.pattern}"   
            style = "width:200px">
         </rich:calendar>   
      </h:form> 
   </h:body>
   
</html>

我们需要创建另一个名为"calendarBean.java"的类，以便保存所有日历值，例如日期、区域设置、日期模式等。以下是"calendarBean.java"的代码。

import java.text.DateFormat; 
import java.util.Date; 
import java.util.Locale; 
  
import javax.faces.event.ValueChangeEvent; 
  
public class CalendarBean { 
   private static final String[] WEEK_DAY_LABELS = new String[] { 
      "Sun *", "Mon +", "Tue +", "Wed +", "Thu +", "Fri +", "Sat *" }; 
   
   private Locale locale; 
   private boolean popup; 
   private boolean readonly; 
   private boolean showInput; 
   private boolean enableManualInput;     
   private String pattern; 
   private Date currentDate; 
   private Date selectedDate; 
   private String jointPoint; 
   private String direction; 
   private String boundary; 
   private boolean useCustomDayLabels; 
  
   public Locale getLocale() { 
      return locale; 
   }
   public void setLocale(Locale locale) { 
      this.locale = locale; 
   } 
   public boolean isPopup() { 
      return popup; 
   } 
   public void setPopup(boolean popup) { 
      this.popup = popup; 
   } 
   public String getPattern() { 
      return pattern; 
   } 
   public void setPattern(String pattern) { 
      this.pattern = pattern; 
   } 
   public CalendarBean() { 
      locale = Locale.US; 
      popup = true; 
      pattern = "MMM d, yyyy"; 
      jointPoint = "bottomleft"; 
      direction = "bottomright"; 
      readonly = true; 
      enableManualInput = false; 
      showInput = true; 
      boundary = "inactive"; 
   } 
   public boolean isShowInput() { 
      return showInput;
   } 
   public void setShowInput(boolean showInput) { 
      this.showInput = showInput; 
   } 
   public boolean isEnableManualInput() { 
      return enableManualInput; 
   } 
   public void setEnableManualInput(boolean enableManualInput) { 
      this.enableManualInput = enableManualInput; 
   } 
   public boolean isReadonly() { 
      return readonly; 
   } 
   public void setReadonly(boolean readonly) { 
      this.readonly = readonly; 
   } 
   public void selectLocale(ValueChangeEvent event) { 
      String tLocale = (String) event.getNewValue(); 
      if (tLocale != null) { 
         String lang = tLocale.substring(0, 2); 
         String country = tLocale.substring(3); 
         locale = new Locale(lang, country, ""); 
      } 
   } 
   public boolean isUseCustomDayLabels() { 
      return useCustomDayLabels; 
   } 
   public void setUseCustomDayLabels(boolean useCustomDayLabels) { 
      this.useCustomDayLabels = useCustomDayLabels; 
   } 
   public Object getWeekDayLabelsShort() { 
      if (isUseCustomDayLabels()) { 
         return WEEK_DAY_LABELS; 
      } else { 
         return null; 
      } 
   } 
   public String getCurrentDateAsText() { 
      Date currentDate = getCurrentDate(); 
      if (currentDate ! =  null) { 
         return DateFormat.getDateInstance(DateFormat.FULL).format(currentDate); 
      } 
      return null; 
   } 
   public Date getCurrentDate() { 
      return currentDate; 
   } 
   public void setCurrentDate(Date currentDate) { 
      this.currentDate = currentDate; 
   } 
   public Date getSelectedDate() { 
      return selectedDate; 
   } 
   public void setSelectedDate(Date selectedDate) { 
      this.selectedDate = selectedDate; 
   } 
   public String getJointPoint() { 
      return jointPoint; 
   } 
   public void setJointPoint(String jointPoint) { 
      this.jointPoint = jointPoint; 
   } 
   public void selectJointPoint(ValueChangeEvent event) { 
      jointPoint = (String) event.getNewValue(); 
   } 
   public String getDirection() { 
      return direction; 
   } 
   public void setDirection(String direction) { 
      this.direction = direction; 
   } 
   public void selectDirection(ValueChangeEvent event) { 
      direction = (String) event.getNewValue(); 
   } 
   public String getBoundary() { 
      return boundary; 
   } 
   public void setBoundary(String boundary) { 
      this.boundary = boundary; 
   } 
}

上述代码将在浏览器中生成以下输出。

Calender 示例

<rich:InputNumberSpinner>

此标记可帮助开发人员创建一个微调器来填充 bean 的实例。以下示例将帮助您详细了解 Spinner 标记。请创建一个单独的 xhtml 文件并将其命名为"InputNumberSpinner.xhtml"，然后将以下代码放入其中。

<?xml version = "1.0" encoding = "UTF-8"?> 
<!DOCTYPE html> 
<html xmlns = "http://www.w3.org/1999/xhtml"   
   xmlns:h = "http://java.sun.com/jsf/html"   
   xmlns:f = "http://java.sun.com/jsf/core"   
   xmlns:ui = "http://java.sun.com/jsf/facelets"   
   xmlns:a4j = "http://richfaces.org/a4j"   
   xmlns:rich = "http://richfaces.org/rich"> 
   
   <h:head> 
      <title>Number Slider Example</title> 
   </h:head>
   
   <h:body> 
      <h:form>   
         <h:outputText value = "Select a Date"></h:outputText>
         <br/>
         <br/>   
         
         <rich:inputNumberSpinner   
            minValue = "1"   
            maxValue = "31"   
            step = "1">   
         </rich:inputNumberSpinner>  
      </h:form>   
   </h:body>
   
</html>

上述代码将在浏览器中产生以下输出。

Rich Input Number Spinner
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