JSF - h:selectOneListbox

h:selectOneListbox 标签呈现指定大小的"select"类型的 HTML 输入元素。

JSF 标签

<h:selectOneListbox value = "#{userData.data}"> 
   <f:selectItem itemValue = "1" itemLabel = "Item 1" /> 
   <f:selectItem itemValue = "2" itemLabel = "Item 2" /> 
</h:selectOneListbox>   

渲染输出

<select name = "j_idt6:j_idt8" size = "2">  
   <option value = "1">Item 1</option> 
   <option value = "2">Item 2</option> 
</select>

标签属性

示例应用程序

让我们创建一个测试 JSF 应用程序来测试上述标记。

UserData.java

package com.tutorialspoint.test;

import java.io.Serializable;

import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;

@ManagedBean(name = "userData", eager = true)
@SessionScoped
public class UserData implements Serializable {
   private static final long serialVersionUID = 1L;
   public String data = "1";

   public String getData() {
      return data;
   }

   public void setData(String data) {
      this.data = data;
   }
}

home.xhtml

<?xml version = "1.0" encoding = "UTF-8"?> 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"  
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 

<html xmlns = "http://www.w3.org/1999/xhtml" 
   xmlns:f = "http://java.sun.com/jsf/core"     
   xmlns:h = "http://java.sun.com/jsf/html"> 
   
   <head> 
      <title>JSF Tutorial!</title> 
   </head> 
   
   <h:body> 
      <h2>h::selectOneListbox example</h2> 
      <hr /> 
      
      <h:form> 
         <h3>List Box</h3>  
         <h:selectOneListbox value = "#{userData.data}"> 
            <f:selectItem itemValue = "1" itemLabel = "Item 1" /> 
            <f:selectItem itemValue = "2" itemLabel = "Item 2" /> 
            <f:selectItem itemValue = "3" itemLabel = "Item 3" /> 
            <f:selectItem itemValue = "4" itemLabel = "Item 4" /> 
            <f:selectItem itemValue = "5" itemLabel = "Item 5" />     
         </h:selectOneListbox>  
         <h:commandButton value = "Submit" action = "result" /> 
      </h:form>    
   
   </h:body>
</html>

result.xhtml

<?xml version = "1.0" encoding = "UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns = "http://www.w3.org/1999/xhtml"
   xmlns:f = "http://java.sun.com/jsf/core"    
   xmlns:h = "http://java.sun.com/jsf/html"
   xmlns:ui = "http://java.sun.com/jsf/facelets">
   
   <head>
      <title>JSF Tutorial!</title>
   </head>
   
   <h:body>
      <h2>Result</h2>
      <hr />
      #{userData.data}
   </h:body>
</html>  

完成所有更改后，让我们像在 JSF - 第一个应用程序章节中一样编译并运行应用程序。如果您的应用程序一切正常，这将产生以下结果。

选择任意选项并按提交按钮。我们已选择第 3 项。您将看到所选结果。

jsf_basic_tags.html