RichFaces - 輸入元件



到目前為止,我們已經學習了大量關於 RichFaces 不同 AJAX 元件以及一個名為“Skin”的新功能的知識。在本章中,我們將學習 RichFaces 提供的不同“Rich”元件,以便開發現代 Web 應用程式。“RichFaces”提供的不同輸入元件如下所示。

<rich:inplaceInput>

Rich inplaceInput 提供了一個機會,可以建立一個可編輯的文字框,而不是普通的輸入文字框。在下面的示例中,我們將使用此元件建立一個可編輯的文字框。建立一個 xhtml 檔案並將其命名為“richinplaceInput.xhtml”。在該檔案中寫入以下程式碼。

<?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>

儲存此檔案並執行它。瀏覽器中將顯示以下輸出。

Enter Your Name

繼續並在該文字框中鍵入您選擇的任何內容,然後按 Enter 鍵。此標籤還提供內聯編輯選項。編輯後將顯示以下輸出。

Inline Edit Option

<rich: inplaceSelect>

這是 RichFaces 提供的另一個輸入標記,使用者可以在其中從下拉列表中選擇一個輸入值,該下拉列表本質上也是內聯且可編輯的。我們需要從內部 bean 類填充下拉列表。請建立一個“xhtml”檔案並將其命名為“richinplaceSelectExample.xhtml”。將以下程式碼段放在該檔案中。

<?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>        

在上面的示例中,我們將從後端填充下拉選項。以下是名為“subject.java”的 bean 類。

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() {  
      //this list to be rendered
      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; 
   } 
}     

我們透過列表傳遞的所有科目名稱都將在下拉選單中顯示。執行此應用程式後將顯示以下輸出。

Dropdown Menu

<rich:SuggestionBox>

<rich:SuggestionBox> 用於根據輸入文字框中提供的輸入向用戶提供建議。此標籤在內部建立一個 JS 事件並呼叫所需的監聽器類以從後端提供建議。不幸的是,此 suggestionBox 和 ComboBox 都合併到 RichFaces 4 中名為“<rich:autocomplete>”的單獨標籤中,但是,如果您使用的是 RichFaces 3,則可以使用如下所示的標籤。

<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”將是一個具有不同引數的 Java 類,而名為“autocomplete”的監聽器類將在執行時設定“capital”例項變數的值並提供所需的輸出選擇。強烈建議使用 RichFaces 4 的“autocomplete”而不是使用此標籤,因為設計人員不再支援此標籤。

<rich:comboBox>

<rich:comboBox> 的工作原理與 <rich:suggestionBox> 完全相同,但是,此標籤不是呼叫監聽器類,而是將一些建議預渲染到客戶端瀏覽器中,這些建議相互互動並提供所需的輸出。與 <rich:sugegstionBox> 一樣,此功能在新版本中也已棄用,並使用另一個名為“<rich:autocomplete>”的標籤,如下面的程式碼中所述。

建立一個單獨的檔案並將其命名為“richAutoComplete.xhtml”。將以下程式碼放在該檔案中。

<?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>

在上面的示例中,我們透過 RichFaces 的自動完成功能填充科目列表。建立另一個 Java 類並將其命名為“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; 
   } 
}     

上述檔案充當 bean 類,而 SubjectList() 是實際將響應呈現到瀏覽器的方法。在 <SuggestionBox>、<ComboBox> 標籤中,我們需要實現監聽器類,但是,對於 <autocomplete> 標籤,此監聽器類的建立已自動化,這使得開發人員更容易操作。上面的程式碼段將在瀏覽器中產生以下輸出。

Subject List

<rich:inputNumberSlider>

這是一個非常簡單的標籤,可以幫助開發人員根據數字間隔建立數字滑塊。建立“inputNumberSlider.xhtml”檔案並將以下程式碼放在其中。

<?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>  

在上面的示例中,屬性非常具有描述性。上面的程式碼段將在瀏覽器中產生以下輸出。

Slide Bar Example

<rich:Calendar>

顧名思義,此標籤將幫助在瀏覽器中建立日曆。建立一個單獨的檔案並將其命名為“richCalendar.xhtml”。將以下程式碼放在其中。

<?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>              

我們需要建立另一個名為“calendarBean.java”的類來儲存所有日曆值,例如日期、區域設定、日期模式等。以下是“calendarBean.java”的程式碼。

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; 
   } 
} 

上面的程式碼段將在瀏覽器中生成以下輸出。

Calender Example

<rich:InputNumberSpinner>

此標籤可以幫助開發人員建立一個微調器來填充 bean 的例項。以下是一個示例,將幫助您詳細瞭解 Spinner 標籤。請建立一個單獨的 xhtml 檔案並將其命名為“InputNumberSpinner.xhtml”,並將以下程式碼放在其中。

<?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>     

上面的程式碼段將在瀏覽器中產生以下輸出。

Rich Input Number Spinner
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