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ajax - 输入字段未更新

转载 作者:行者123 更新时间:2023-12-01 09:34:59 25 4
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这是完整的源代码:http://www.sendspace.com/file/lwxpyf

我遇到了无法解决的 JSF 页面问题。我有一个 JSF 页面,用于将应用程序设置存储到数据库表中。这是JSF页面的源代码:

<?xml version='1.0' encoding='UTF-8' ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:ui="http://java.sun.com/jsf/facelets">
<h:head>
<ui:insert name="header">
<ui:include src="header.xhtml"/>
</ui:insert>
</h:head>
<h:body>

<h1><img src="resources/css/images/icon.png" alt="NVIDIA.com" /> Settings Center</h1>
<!-- layer for black background of the buttons -->
<div id="toolbar" style="margin: 0 auto; width:1180px; height:30px; position:relative; background-color:black">
<!-- Include page Navigation -->
<ui:insert name="Navigation">
<ui:include src="Navigation.xhtml"/>
</ui:insert>

</div>

<div id="greenBand" class="ui-state-default ui-corner-allh" style="position:relative; top:35px; left:0px;">
<h:graphicImage alt="Application Settings" style="position:relative; top:-20px; left:9px;" value="resources/images/logo_application_settings.png" />
</div>
<div id="main" style="margin: 0 auto; width:1190px; height:700px; position:absolute; background-color:transparent; top:105px">

<div id="mainpage" style="margin: 0 auto; width:1190px; height:500px; position:absolute; background-color:transparent; top:80px">
<h:form>
<div id="settingsdiv" style="width:550px; height:400px; position:absolute; background-color:r; top:20px; left:1px">

<h:panelGrid columns="2">
<h:panelGroup>User Session Timeout</h:panelGroup>
<h:panelGroup>
<h:selectOneMenu value="#{ApplicationController.settings['SessionTTL']}">
<f:selectItem itemValue="#{ApplicationController.settings['SessionTTL']}" itemLabel="#{ApplicationController.settings['SessionTTL']}" />
<f:selectItem itemValue="two" itemLabel="Option two" />
<f:selectItem itemValue="three" itemLabel="Option three" />
<f:selectItem itemValue="custom" itemLabel="Define custom value" />
<f:ajax render="input" />
</h:selectOneMenu>&nbsp;
<h:panelGroup id="input">
<h:inputText value="#{ApplicationController.settings['SessionTTL']}" rendered="#{ApplicationController.settings['SessionTTL'] == 'custom'}" required="true" />
</h:panelGroup>
</h:panelGroup>

<h:panelGroup>Maximum allowed users</h:panelGroup>
<h:panelGroup>
<h:selectOneMenu value="#{ApplicationController.settings['MaxUsersActive']}">
<f:selectItem itemValue="#{ApplicationController.settings['MaxUsersActive']}" itemLabel="#{ApplicationController.settings['MaxUsersActive']}" />
<f:selectItem itemValue="two" itemLabel="Option two" />
<f:selectItem itemValue="three" itemLabel="Option three" />
<f:selectItem itemValue="custom" itemLabel="Define custom value" />
<f:ajax render="inputl" />
</h:selectOneMenu>&nbsp;
<h:panelGroup id="inputl">
<h:inputText value="#{ApplicationController.settings['MaxUsersActive']}" rendered="#{ApplicationController.settings['MaxUsersActive'] == 'custom'}" required="true" />
</h:panelGroup>
</h:panelGroup>
</h:panelGrid>



</div>

<div id="settingsonediv" style="width:350px; height:400px; position:absolute; background-color:transparent; top:20px; left:400px">



</div>

<div id="settingstwodiv" style="width:150px; height:60px; position:absolute; background-color:transparent; top:380px; left:800px">

<h:commandButton value="Save Settings" action="#{ApplicationController.updateDBSettings}">
<f:ajax render="@form" execute="@form"></f:ajax>
</h:commandButton>

</div>


</h:form>
</div>
</div>

</h:body>
</html>

这是托管 bean:

import java.io.Serializable;
import javax.enterprise.context.SessionScoped;
// or import javax.faces.bean.SessionScoped;
import javax.inject.Named;
/* include SQL Packages */
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.HashMap;
import javax.annotation.PostConstruct;
import javax.sql.DataSource;
import javax.annotation.Resource;
import javax.faces.context.FacesContext;
import javax.inject.Inject;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
// or import javax.faces.bean.ManagedBean;

import org.glassfish.osgicdi.OSGiService;

@Named("ApplicationController")
@SessionScoped
public class Application implements Serializable {

/* This Hash Map will be used to store setting and value */
private HashMap<String, String> settingsMap = null;

public Application(){
}

/* Call the Oracle JDBC Connection driver */
@Resource(name = "jdbc/Oracle")
private DataSource ds;


/* Hash Map
* Send this hash map with the settings and values to the JSF page
*/
public HashMap<String, String> getsettings(){
return settingsMap;
}

/* Get a Hash Map with settings and values. The table is genarated right
* after the constructor is initialized.
*/
@PostConstruct
public void initSettings() throws SQLException
{
settingsMap = new HashMap<String, String>();

if(ds == null) {
throw new SQLException("Can't get data source");
}
/* Initialize a connection to Oracle */
Connection conn = ds.getConnection();

if(conn == null) {
throw new SQLException("Can't get database connection");
}
/* With SQL statement get all settings and values */
PreparedStatement ps = conn.prepareStatement("SELECT * from GLOBALSETTINGS");

try
{
//get data from database
ResultSet result = ps.executeQuery();
while (result.next())
{
settingsMap.put(result.getString("SettingName"), result.getString("SettingValue"));
}
}
finally
{
ps.close();
conn.close();
}
}

/* JSF returns the updated values into the HashMap */

/* Update Settings Values */
public void updateDBSettings() throws SQLException {

String SQL_Statement = null;

if (ds == null) throw new SQLException();
Connection conn = ds.getConnection();
if (conn == null) throw new SQLException();

try {
conn.setAutoCommit(false);
boolean committed = false;
try {
/* Insert the new settings values with one SQL statement */
SQL_Statement = "UPDATE GLOBALSETTINGS " +
"SET \"SettingValue\" = " +
"CASE " +
"WHEN \"SettingName\" = 'SessionTTL' THEN ? " +
"WHEN \"SettingName\" = 'MaxUsersActive' THEN ? " +
"END " +
"WHERE \"SettingName\" IN ('SessionTTL', 'MaxUsersActive')";
/* Exete thre SQL statement */
PreparedStatement updateQuery = conn.prepareStatement(SQL_Statement);
updateQuery.setString(1, settingsMap.get("SessionTTL"));
updateQuery.setString(2, settingsMap.get("MaxUsersActive"));

updateQuery.executeQuery();
conn.commit();
committed = true;
} finally {
if (!committed) conn.rollback();
}
}
finally {
/* Release the resource after all SQL queries are executed */
conn.close();
}
/* Refresh Hash Map
* Get again settings from Oracle
*/
initSettings();

}


}

这是我面临的问题:

当我打开 JSF 页面时,我会看到以下菜单:

enter image description here

然后我从菜单中选择自定义:

enter image description here

我在菜单旁边看到了这个输入字段:

enter image description here

然后我从键盘输入自定义值:

enter image description here

但是当我点击保存按钮时,我得到了这个。我可以看到数据库字段已更新,但值是“自定义”

enter image description here

当我输入相同的两次值时,我得到这个:

enter image description here

似乎当我单击 custom 并输入自定义值时,HashMap 没有更新。奇怪的是,当我再次执行此操作时,HashMap 已更新并且值正确。我该如何解决这个问题?

最好的祝福

编辑

我怀疑是 JSF 版本导致了这个问题。这是 faces-config.xml

的内容
 <?xml version="1.0"?>
<faces-config xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-facesconfig_2_0.xsd"
version="2.0">
<managed-bean>
<description>comment</description>
<managed-bean-name>ApplicationController</managed-bean-name>
<managed-bean-class>com.DX_57.SM_57.Application</managed-bean-class>
<managed-bean-scope>request</managed-bean-scope>
</managed-bean>
<managed-bean>
<description>comment</description>
<managed-bean-name>DashboardController</managed-bean-name>
<managed-bean-class>com.DX_57.SM_57.Dashboard</managed-bean-class>
<managed-bean-scope>request</managed-bean-scope>
</managed-bean>
<managed-bean>
<description>comment</description>
<managed-bean-name>DatabaseController</managed-bean-name>
<managed-bean-class>com.DX_57.SM_57.Database</managed-bean-class>
<managed-bean-scope>request</managed-bean-scope>
</managed-bean>
<managed-bean>
<description>comment</description>
<managed-bean-name>GeneralController</managed-bean-name>
<managed-bean-class>com.DX_57.SM_57.General</managed-bean-class>
<managed-bean-scope>request</managed-bean-scope>
</managed-bean>
<managed-bean>
<description>comment</description>
<managed-bean-name>GlassfishController</managed-bean-name>
<managed-bean-class>com.DX_57.SM_57.Glassfish</managed-bean-class>
<managed-bean-scope>request</managed-bean-scope>
</managed-bean>
<managed-bean>
<description>comment</description>
<managed-bean-name>LinuxController</managed-bean-name>
<managed-bean-class>com.DX_57.SM_57.Linux</managed-bean-class>
<managed-bean-scope>request</managed-bean-scope>
</managed-bean>
<managed-bean>
<description>comment</description>
<managed-bean-name>LinuxConfigurationController</managed-bean-name>
<managed-bean-class>com.DX_57.SM_57.LinuxConfiguration</managed-bean-class>
<managed-bean-scope>request</managed-bean-scope>
</managed-bean>
<managed-bean>
<description>comment</description>
<managed-bean-name>LogController</managed-bean-name>
<managed-bean-class>com.DX_57.SM_57.Log</managed-bean-class>
<managed-bean-scope>request</managed-bean-scope>
</managed-bean>
<managed-bean>
<description>comment</description>
<managed-bean-name>OracleController</managed-bean-name>
<managed-bean-class>com.DX_57.SM_57.Oracle</managed-bean-class>
<managed-bean-scope>request</managed-bean-scope>
</managed-bean>
<managed-bean>
<description>comment</description>
<managed-bean-name>UpdatesController</managed-bean-name>
<managed-bean-class>com.DX_57.SM_57.Updates</managed-bean-class>
<managed-bean-scope>request</managed-bean-scope>
</managed-bean>
</faces-config>

这是beans.xml的内容

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/beans_1_0.xsd">
</beans>

这是web.xml

的内容
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
<context-param>
<param-name>javax.faces.PROJECT_STAGE</param-name>
<param-value>Development</param-value>
</context-param>
<servlet>
<servlet-name>Faces Servlet</servlet-name>
<servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>Faces Servlet</servlet-name>
<url-pattern>*.jsf</url-pattern>
</servlet-mapping>

<welcome-file-list>
<welcome-file>index.html</welcome-file>
</welcome-file-list>
</web-app>

应该如何更改它们才能使用最新的 JSF 版本?

EDIT 2 我在 Firefox 中禁用了 JavaScript。我测试了代码。事实证明它有效,但我每次都必须点击保存按钮:

enter image description here

我选择自定义并点击保存按钮

enter image description here

enter image description here

当我单击“保存”按钮时,会出现自定义字段。

enter image description here

当我输入自定义值并单击“保存”按钮时,该字段会更新。

我想它不会工作,因为数据没有从 JavaScrips 发送回服务器

EDIT 3 来自 firebug 的调试信息:

我从菜单中选择自定义:

<update id="j_idt5:input"><![CDATA[<span id="j_idt5:input"><input type="text" name="j_idt5:j_idt15" value="custom" /></span>]]></update>

我输入自定义值:

<?xml version='1.0' encoding='UTF-8'?>
<partial-response><changes><update id="j_idt5"><![CDATA[
<form id="j_idt5" name="j_idt5" method="post" action="/SM_57-1.0-SNAPSHOT/Application.jsf" enctype="application/x-www-form-urlencoded">
<input type="hidden" name="j_idt5" value="j_idt5" />
<table>
<tbody>
<tr>
<td>User Session Timeout</td>
<td><select id="j_idt5:j_idt10" name="j_idt5:j_idt10" size="1" onchange="mojarra.ab(this,event,'valueChange',0,'j_idt5:input')"> <option value="custom" selected="selected">custom</option>
<option value="two">Option two</option>
<option value="three">Option three</option>
<option value="custom" selected="selected">Define custom value</option>
</select><span id="j_idt5:input"><input type="text" name="j_idt5:j_idt15" value="custom" /></span></td>
</tr>
<tr>
<td>Maximum allowed users</td>
</tr>
</tbody>
</table>
<input id="j_idt5:j_idt18" type="submit" name="j_idt5:j_idt18" value="Save Settings" onclick="mojarra.ab(this,event,'action','@form','@form');return false" />
</form>]]></update><update id="javax.faces.ViewState"><![CDATA[-8356663926661541536:7758149566419150570]]></update></changes></partial-response>

我点击保存按钮:

<?xml version='1.0' encoding='UTF-8'?>
<partial-response><changes><update id="j_idt5"><![CDATA[
<form id="j_idt5" name="j_idt5" method="post" action="/SM_57-1.0-SNAPSHOT/Application.jsf" enctype="application/x-www-form-urlencoded">
<input type="hidden" name="j_idt5" value="j_idt5" />
<table>
<tbody>
<tr>
<td>User Session Timeout</td>
<td><select id="j_idt5:j_idt10" name="j_idt5:j_idt10" size="1" onchange="mojarra.ab(this,event,'valueChange',0,'j_idt5:input')"> <option value="wdwdew" selected="selected">wdwdew</option>
<option value="two">Option two</option>
<option value="three">Option three</option>
<option value="custom">Define custom value</option>
</select><span id="j_idt5:input"></span></td>
</tr>
<tr>
<td>Maximum allowed users</td>
</tr>
</tbody>
</table>
<input id="j_idt5:j_idt18" type="submit" name="j_idt5:j_idt18" value="Save Settings" onclick="mojarra.ab(this,event,'action','@form','@form');return false" />
</form>]]></update><update id="javax.faces.ViewState"><![CDATA[-8356663926661541536:7758149566419150570]]></update></changes></partial-response>

最佳答案

您已经在 faces-config.xml 中重新定义了 bean。您的托管 bean 被重新定义为请求范围的 bean:

<managed-bean>
<description>comment</description>
<managed-bean-name>ApplicationController</managed-bean-name>
<managed-bean-class>com.DX_57.SM_57.Application</managed-bean-class>
<managed-bean-scope>request</managed-bean-scope>
</managed-bean>

faces-config.xml 文件中的托管 bean 配置比注解具有 优先级。您的 ApplicationController bean 实际上是一个请求范围的 JSF 托管 bean,而不是像您通过注释声明的 session 范围的 CDI 托管 bean。在每一个 ajax 请求中,都会创建一个全新的请求。先前请求中所做的所有更改都被“遗忘”。

你有两个选择:

  • faces-config.xml 中删除 bean 配置。
  • 将托管 bean 范围更改为 view(请注意,管理 bean 实例的仍然是 JSF,而不是 CDI,并且 CDI 没有合适的 @ViewScoped 注释)。

关于ajax - 输入字段未更新,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/9761568/

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