Js代碼

1. onclick="if(!comfirm('確認(rèn)刪除么？')) return false;"  

onclick="if(!comfirm('確認(rèn)刪除么？')) return false;"

同樣的，RichFaces的a:commandLink與a:commandButton也是一樣操作

但是對于seam的s:link與s:button就不用，按照以前一樣的方式

Js代碼

1. onclick="return confirm('確認(rèn)刪除？');"  

1) When using a jsp:include within the f:view tags, must include f:subview in the included file (or around the jsp:include tag).

當(dāng)在f:view中使用jsp:include標(biāo)簽插入一個文件時，必須用f:subview把jsp:include包起來

2) In the include file, cannot have any HTML. All HTML tags must be wrapped in f:verbatim tags.

在被插入的文件中，不能有任何的html標(biāo)簽，如果必須使用html標(biāo)簽，必須用f:verbatim將它包起來。

3) Within main f:view tags however, it is not necessary to wrap everything in f:verbatim tags (it's not bad either). Just HTML that appears as children to other JSF components (i.e. t:newspaperTable).

在主f:view中，沒有必要用f:verbatim將html標(biāo)簽包起來（當(dāng)然包起來也可以）。當(dāng)html標(biāo)簽出現(xiàn)在子視圖或其它JSF部件標(biāo)簽中時，就要用f:verbatim包起來。

10.JSF的緩存能力好像太強了，有時停止了服務(wù)器，改動了jsp頁面中的jsf標(biāo)簽，再啟動服務(wù)器，但到該頁面時，還是原來的內(nèi)容，需要手動刷新一下。有時需要先轉(zhuǎn)到別的頁面，再回來刷新一下才能看到更新的內(nèi)容。

Myfaces1.4 + tomahawk-1.1.3 + tomcat5.x + JDK5

下載：http://myfaces.apache.org

2.     問題描述

假設(shè)場景，首先顯示用戶列表（用dataTable來實現(xiàn)列表顯示），然后可以點擊用戶的名字導(dǎo)航到用戶詳細(xì)信息頁面。

3.     嘗試實現(xiàn)以及出現(xiàn)的問題

UserInfo.java

package com.wide.jsf.model;

/**

 * 用戶信息

 *

 * @author cydooo

 *

 */

public class UserInfo {

    private Long userId;

    private String username;

    private String userdesc;

    public UserInfo() {

    }

    public UserInfo(Long userId, String username) {

        this.userId = userId;

        this.username = username;

    }

    public UserInfo(Long userId, String username, String userdesc) {

        this(userId, username);

        this.userdesc = userdesc;

    }

    //省略getter和setter

}
 

UserInfoAction.java

package com.wide.jsf.web;

import java.util.Arrays;

import java.util.List;

import javax.faces.context.FacesContext;

import com.wide.jsf.model.UserInfo;

public class UserInfoAction {

    /*

     * 用于顯示詳細(xì)信息

     */

    private UserInfo userInfo;

    /*

     * 用于顯示用戶列表

     */

    private List<UserInfo> userInfos;

    public UserInfo getUserInfo() {

       return userInfo;

    }

    public void setUserInfo(UserInfo userInfo) {

       this.userInfo = userInfo;

    }

    public List<UserInfo> getUserInfos() {

       return userInfos;

    }

    public void setUserInfos(List<UserInfo> userInfos) {

       this.userInfos = userInfos;

    }

    public String listUser() {

       userInfos = Arrays.asList(new UserInfo[] { new UserInfo(1L, "Tom"),new UserInfo(2L, "John"), new UserInfo(3L, "Lily") });

         return "listUser";

    }

    public String showDetail() {

       FacesContext context = FacesContext.getCurrentInstance();

       Long userId = Long.parseLong((String) context.getExternalContext()

              .getRequestParameterMap().get("userId"));

       System.out.println("==>" + userId);

       switch (userId.intValue()) {

       case 1:

           userInfo = new UserInfo(1L, "Tom", "I am Tom");

           break;

       case 2:

           userInfo = new UserInfo(2L, "John", "I am John");

           break;

       case 3:

           userInfo = new UserInfo(3L, "Lily", "I am Lily");

       }

       return "userdetail";

    }

}
 

Backingbean和navigation的配置

<managed-bean>

       <managed-bean-name>userInfoAction</managed-bean-name>

       <managed-bean-class>

           com.wide.jsf.web.UserInfoAction

       </managed-bean-class>

       <managed-bean-scope>request</managed-bean-scope>

    </managed-bean>

    <navigation-rule>

       <from-view-id>/listUser.jsp</from-view-id>

       <navigation-case>

           <from-outcome>userdetail</from-outcome>

           <to-view-id>/userdetail.jsp</to-view-id>

       </navigation-case>

    </navigation-rule>

    <navigation-rule>

       <from-view-id>/userdetail.jsp</from-view-id>

    </navigation-rule>
 

Jsp頁面內(nèi)容

A． listUser.jsp

<%@ taglib uri="http://java.sun.com/jsf/core" prefix="f"%>

<%@ taglib uri="http://java.sun.com/jsf/html" prefix="h"%>

<%@ page contentType="text/html; UTF-8" pageEncoding="UTF-8"%>

<f:view>

<html>

  <head>

    <title>userlist</title>

  </head>

  <body>

    <h:form>

       <h:dataTable var="user" value="#{userInfoAction.userInfos}">

           <h:column>

              <h:commandLink value="#{user.username}" action="#{userInfoAction.showDetail}">

                  <f:param value="#{user.userId}" name="userId"/>

              </h:commandLink>

           </h:column>

       </h:dataTable>

    </h:form>

  </body>

</html>

</f:view>
 

B. userdetail.jsp

<%@ taglib uri="http://java.sun.com/jsf/core" prefix="f"%>

<%@ taglib uri="http://java.sun.com/jsf/html" prefix="h"%>

<%@ page contentType="text/html; UTF-8" pageEncoding="UTF-8"%>

<f:view>

<html>

  <head>

    <title>userDetail</title>

  </head>

  <body>

    <h:form>

    <h:outputText value="#{userInfoAction.userInfo.userdesc}"/>

    </h:form>

  </body>

</html>

</f:view>
 

編碼結(jié)束，啟動tomcat測試，進(jìn)入userlist頁面之后，我們可以看到用戶列表，但點擊用戶查看詳細(xì)信息的時候，發(fā)現(xiàn)并沒有調(diào)用showDetail方法。

4.     解決辦法

A．                        將<managed-bean-scope>request</managed-bean-scope>改為<managed-bean-scope>session</managed-bean-scope>。這是最簡單的做法，改了之后重起Tomcat之后馬上就看到效果了。但是很明顯的使用session scope不好，比如這個例子，用戶列表在當(dāng)前seesion有效的情況下將一直保留，多窗口瀏覽器中也容易發(fā)生意想不到的問題。沒有必要不要用session。

B．                        將用戶列表綁定到dataTable控件。

首先修改UserInfo類，讓他實現(xiàn)Serializable接口，其他代碼完全一樣，實現(xiàn)Serializable接口是必須的，否則會拋出java.io.NotSerializableException異常。

public class UserInfo implements Serializable{…}
 

UserInfoAction.java的修改

package com.wide.jsf.web;

import java.util.Arrays;

import java.util.List;

import javax.faces.component.html.HtmlDataTable;

import javax.faces.context.FacesContext;

import com.wide.jsf.model.UserInfo;

public class UserInfoAction {

    /*

     * 用于顯示詳細(xì)信息

     */

    private UserInfo userInfo;

    /*

     * 綁定用戶列表

     */

    private HtmlDataTable dataTable = new HtmlDataTable();

    public UserInfo getUserInfo() {

       return userInfo;

    }

    public void setUserInfo(UserInfo userInfo) {

       this.userInfo = userInfo;

    }

    public String listUser() {

       List<UserInfo> userInfos = Arrays.asList(new UserInfo[] { new UserInfo(1L, "Tom"),

              new UserInfo(2L, "John"), new UserInfo(3L, "Lily") });

       dataTable.setValue(userInfos);

       return "listUser";

    }

    public String showDetail() {

       FacesContext context = FacesContext.getCurrentInstance();

       Long userId = Long.parseLong((String) context.getExternalContext()

              .getRequestParameterMap().get("userId"));

       System.out.println("==>" + userId);

       switch (userId.intValue()) {

       case 1:

           userInfo = new UserInfo(1L, "Tom", "I am Tom");

           break;

       case 2:

           userInfo = new UserInfo(2L, "John", "I am John");

           break;

       case 3:

           userInfo = new UserInfo(3L, "Lily", "I am Lily");

       }

       return "userdetail";

    }

    public HtmlDataTable getDataTable() {

       return dataTable;

    }

    public void setDataTable(HtmlDataTable dataTable) {

       this.dataTable = dataTable;

    }

}
 

listUser.jsp的修改

<%@ taglib uri="http://java.sun.com/jsf/core" prefix="f"%>

<%@ taglib uri="http://java.sun.com/jsf/html" prefix="h"%>

<%@ page contentType="text/html; UTF-8" pageEncoding="UTF-8"%>

<f:view>

<html>

  <head>

    <title>userlist</title>

  </head>

  <body>

    <h:form>

       <h:dataTable var="user" binding="#{userInfoAction.dataTable}">

           <h:column>

              <h:commandLink value="#{user.username}" action="#{userInfoAction.showDetail}">

                  <f:param value="#{user.userId}" name="userId"/>

              </h:commandLink>

           </h:column>

       </h:dataTable>

    </h:form>

  </body>

</html>

</f:view>
 

重起Tomcat一切OK，不需要非得在session scope下了。

本文來自CSDN博客，轉(zhuǎn)載請標(biāo)明出處：http://blog.csdn.net/pengrg166/archive/2007/01/22/1490174.aspx