如何使用AJAX数据验证创建JSF表单 [英] How to create JSF form with AJAX data validation
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问题描述
我正在研究一个JSF表单原型，以使用AJAX数据验证将数据插入数据库表中.这是JSF页面:
I'm working on a JSF form prototype for inserting data into database table using AJAX data validation This is the JSF page:
<?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" /> History 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="logodiv" style="position:relative; top:35px; left:0px;">
<h:graphicImage alt="Demo Insert Form" style="position:relative; top:-20px; left:9px;" value="resources/images/logo_databasez.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">
<div id="settingsHashMap" style="width:350px; height:400px; position:absolute; background-color:r; top:20px; left:1px">
<h:form>
<div id="settingsdiv" style="width:750px; height:400px; position:absolute; background-color:r; top:20px; left:1px">
<h:panelGrid columns="2">
<h:panelGroup>Session ID</h:panelGroup>
<h:panelGroup>
<h:inputText id="sessionid" value="#{DatabaseController.formMap['sessionid']}" >
<f:validateLength minimum="0" maximum="15"/>
<f:ajax render="sessionidvalidate" event="blur"/>
</h:inputText>
<h:outputText id="sessionidvalidate" rendered="#{DatabaseController.validateSessionid}" value="session is already registered" />
</h:panelGroup>
<h:panelGroup>User ID</h:panelGroup>
<h:panelGroup>
<h:inputText id="userid" value="#{DatabaseController.formMap['userid']}" >
<f:validateLength minimum="0" maximum="15"/>
</h:inputText>
</h:panelGroup>
<h:panelGroup>Login Time</h:panelGroup>
<h:panelGroup>
<h:inputText id="logintime" value="#{DatabaseController.formMap['logintime']}" >
<f:validateLength minimum="0" maximum="35"/>
</h:inputText>
</h:panelGroup>
<h:panelGroup>Last Refresh Time</h:panelGroup>
<h:panelGroup>
<h:inputText id="lastrefreshtime" value="#{DatabaseController.formMap['lastrefreshtime']}" >
<f:validateLength minimum="0" maximum="35"/>
</h:inputText>
</h:panelGroup>
<h:panelGroup>User IP</h:panelGroup>
<h:panelGroup>
<h:inputText id="userip" value="#{DatabaseController.formMap['userip']}" >
<f:validateLength minimum="0" maximum="15"/>
</h:inputText>
</h:panelGroup>
</h:panelGrid>
</div>
<div id="settingstwodiv" style="width:150px; height:60px; position:absolute; background-color:transparent; top:380px; left:800px">
<h:commandButton value="Create User" action="#{DatabaseController.saveData}"/>
</div>
</h:form>
</div>
</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.sql.Timestamp;
import java.text.ParseException;
import java.text.SimpleDateFormat;
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;
// Demo Insert Form
@Named("DatabaseController")
@SessionScoped
public class Database implements Serializable {
private HashMap<String, String> formMap = new HashMap<>();
public Database() {
}
/* Call the Oracle JDBC Connection driver */
@Resource(name = "jdbc/Oracle")
private DataSource ds;
public HashMap<String, String> getformMap() {
return formMap;
}
/*
CREATE TABLE ACTIVESESSIONS(
SESSIONID VARCHAR2(30 ) NOT NULL,
USERID VARCHAR2(30 ) NOT NULL,
LOGINTIME TIMESTAMP(6),
LASTREFRESHTIME TIMESTAMP(6),
USERIP VARCHAR2(30 )
)
/
*/
@PostConstruct
public void hashMapGenerate() {
/* Initialize the hashmap */
formMap.put("sessionid", null);
formMap.put("userid", null);
formMap.put("logintime", null);
formMap.put("lastrefreshtime", null);
formMap.put("userip", null);
}
public int saveData() throws SQLException, java.text.ParseException {
// formMap = new HashMap<String, String>();
String SqlStatement = null;
if (ds == null) {
throw new SQLException();
}
Connection conn = ds.getConnection();
if (conn == null) {
throw new SQLException();
}
PreparedStatement ps = null;
/*
CREATE TABLE ACTIVESESSIONS(
SESSIONID VARCHAR2(30 ) NOT NULL,
USERID VARCHAR2(30 ) NOT NULL,
LOGINTIME TIMESTAMP(6),
LASTREFRESHTIME TIMESTAMP(6),
USERIP VARCHAR2(30 )
)
/
*/
try {
conn.setAutoCommit(false);
boolean committed = false;
try { /* insert into Oracle the default system(Linux) time */
SqlStatement = "INSERT INTO ACTIVESESSIONS"
+ " (SESSIONID, USERID, LOGINTIME, LASTREFRESHTIME, USERIP)"
+ " VALUES (?, ?, ?, ?, ?)";
ps = conn.prepareStatement(SqlStatement);
ps.setString(1, formMap.get("sessionid"));
ps.setString(2, formMap.get("userid"));
ps.setTimestamp(3, toTimeStamp(formMap.get("logintime")));
ps.setTimestamp(4, toTimeStamp(formMap.get("lastrefreshtime")));
ps.setString(5, formMap.get("userip"));
ps.executeUpdate();
conn.commit();
committed = true;
}
finally
{
if (!committed) {
conn.rollback();
}
}
} finally {
/* Release the resources */
ps.close();
conn.close();
}
return 0;
}
private Timestamp toTimeStamp(String s) throws java.text.ParseException
{
Timestamp ts = null;
java.util.Date date = null;
if (s == null || s.trim().isEmpty()) return ts;
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss.S");
date = (java.util.Date) sdf.parse(s);
ts = new Timestamp(date.getTime());
return ts;
}
/* Validators section */
public boolean getvalidateSessionid(){
//do SQL query
return true;
}
}
我在实施表单验证时遇到困难.我想传递使用者输入的字符串，并将其检查到数据库中，该值是否已进入数据库表中.在这里，我正在调用Java方法来检查值:
I'm having difficulties in implementing the form validation. I want to pass the String entered by the used and check it into database is this value already into the database table. Here I'm calling the Java method to check the value:
<h:panelGroup>
<h:inputText id="sessionid" value="#{DatabaseController.formMap['sessionid']}" >
<f:validateLength minimum="0" maximum="15"/>
<f:ajax render="sessionidvalidate" event="blur"/>
</h:inputText>
<h:outputText id="sessionidvalidate" rendered="#{DatabaseController.validateSessionid}" value="session is already registered" />
</h:panelGroup>
如何将插入的值发送到Java方法?
How I can send the inserted value to the Java method?
最良好的祝愿
推荐答案
您需要创建一个Validator.
开球示例:
@FacesValidator("sessionIdValidator")
public class SessionIdValidator implements Validator {
@Override
public void validate(FacesContext context, UIComponent component, Object value) throws ValidatorException {
// ...
if (yourDataService.existSessionId(value)) {
throw new ValidatorException(new FacesMessage(FacesMessage.SEVERITY_ERROR,
"Session ID is already in use, please choose another.", null));
}
}
}
按以下方式使用它:
<h:inputText id="sessionid" value="#{DatabaseController.formMap['sessionid']}">
<f:validateLength minimum="0" maximum="15" />
<f:validator validatorId="sessionIdValidator" />
<f:ajax event="blur" render="sessionidMessage" />
</h:inputText>
<h:message id="sessionidMessage" for="sessionid" />
请注意，您应该使用<h:message>来显示验证消息.您认为没有任何人.将其应用于所有其他字段:
Note that you should use a <h:message> to show validation messages. You haven't any one in your view. Apply the same for all your other fields:
<h:inputText id="userid" value="#{DatabaseController.formMap['userid']}">
<f:validateLength minimum="0" maximum="15" />
<f:ajax event="blur" render="useridMessage" />
</h:inputText>
<h:message id="useridMessage" for="userid" />
如果要在验证器中使用@Resource或@EJB或@Inject，则将@FacesValidator批注替换为@ManagedBean或(由于某种原因，您似乎使用了CDI)@Named:
If you want to use @Resource or @EJB or @Inject in the validator, then replace the @FacesValidator annotation by @ManagedBean or (as you seem to use CDI for some reason) @Named:
@Named
public class SessionIdValidator implements Validator {
@Resource
private DataSource dataSource;
@Inject
private YourDataService yourDataService;
// ...
}
并按如下方式使用它
<f:validator binding="#{sessionIdValidator}" />
这篇关于如何使用AJAX数据验证创建JSF表单的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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