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java - 基于 selectOneMenu 值更新 JSF 数据表

转载 作者:行者123 更新时间:2023-11-30 09:57:41 26 4
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我正在尝试创建一个 JSF 页面,用户可以在其中选择两个 selectOneMenu 组件中的值。这些选择中的值随后将传递给 SQL 查询以更新页面上显示的表格。

我已经将每个选择项绑定(bind)到支持 bean 中的适当变量,但是在更改 selectOneMenu 中选择的值之后,支持 bean 中的绑定(bind)属性不会更改,并且执行了查询但没有'不返回任何结果。 (顺便说一句,在页面最初显示时,getter 似乎也被调用了两次)。

我不能使用任何其他第三方组件(例如 RichFaces 等)来实现此实现。

感谢任何对此的见解!

代码如下:

笔记.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@ taglib uri="http://java.sun.com/jsf/html" prefix="h"%>
<%@ taglib uri="http://java.sun.com/jsf/core" prefix="f"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title></title>
</head>
<body>

<f:view>

<h:form id="notelistform">
<f:subview id="loginbar">
<jsp:include page="/jsp/loginbar.jsp" />
</f:subview>

<h:outputText value="Worktype:" />
<h:selectOneMenu value="#{pc_noteListBacker.worktype}"
title="worktype" id="worktypeList" onchange="submit()">
<f:selectItems value="#{pc_noteListBacker.selectWorktypes}" />
<f:valueChangeListener
type="<package>.web.backer.note.NoteListBacker" />

</h:selectOneMenu>

<h:outputText value="Product:" />
<h:selectOneMenu value="#{pc_noteListBacker.product}" title="product"
id="productList" onchange="submit()">
<f:selectItems value="#{pc_noteListBacker.selectProducts}" />
<f:valueChangeListener
type="<package>.web.backer.note.NoteListBacker" />
</h:selectOneMenu>


<h:dataTable id="notelisttable" value="#{pc_noteListBacker.noteList}"
var="item" bgcolor="#F1F1F1" border="10" cellpadding="5"
cellspacing="3" first="0" width="80%" dir="LTR" frame="hsides"
rules="all" summary="Status and notes note table display."
binding="#{pc_noteListBacker.noteListTable}">


<h:column>
<f:facet name="header">
<h:outputText value="Note ID" />
</f:facet>
<h:outputText value="#{item.noteId}"></h:outputText>
</h:column>


<h:column>
<f:facet name="header">
<h:outputText value="Note Category" />
</f:facet>
<h:outputText value="#{item.noteCategory}"></h:outputText>
<f:facet name="footer">
<h:commandButton value="Add" action="#{pc_noteListBacker.insert}">
</h:commandButton>
</f:facet>
</h:column>

<h:column>
<f:facet name="header">
<h:outputText value="Note Subcategory" />
</f:facet>
<h:outputText value="#{item.noteSubCategory}"></h:outputText>
</h:column>


<h:column>
<f:facet name="header">
<h:outputText value="Note" />
</f:facet>
<h:outputText value="#{item.note}"></h:outputText>
</h:column>



<h:column>
<h:commandButton value="Edit" action="#{pc_noteListBacker.edit}">
</h:commandButton>
</h:column>
<h:column>
<h:commandButton value="Delete" action="#{pc_noteListBacker.delete}"></h:commandButton>
</h:column>
</h:dataTable>

</h:form>

NoteListBacker.java

 package <package>.web.backer.note;

import java.util.List;
import java.util.ArrayList;

import javax.faces.component.UIComponent;
import javax.faces.component.UIComponentBase;
import javax.faces.component.UIData;
import javax.faces.context.FacesContext;
import javax.faces.event.AbortProcessingException;
import javax.faces.event.ValueChangeEvent;
import javax.faces.event.ValueChangeListener;
import javax.faces.model.ListDataModel;
import javax.faces.model.SelectItem;
import javax.swing.JOptionPane;


public class NoteListBacker implements ValueChangeListener {

private UIData noteListTable;

private Note note;

private NoteCategory noteCategory;

private NoteSubCategory noteSubCategory;

private NoteDao nDao;

private SybaseSqlDao sybaseDao;

private List<Note> noteList;

private List<SelectItem> selectWorktypes;

private List<SelectItem> selectProducts;

private String worktype;

private List<String> worktypeList;

private String product;

private List<Product> productList;

private int noteId;

public NoteListBacker() {

nDao = new NoteDao();
sybaseDao = new SybaseSqlDao();
selectWorktypes = new ArrayList<SelectItem>();
selectProducts = new ArrayList<SelectItem>();
noteList = new ArrayList<Note>();
note = new Note();
worktypeList = new ArrayList<String>();
productList = new ArrayList<Product>();
}

public String insert() {
return "success";
}

public String save() {
return "notes";
}

public String edit() {
return "success";
}

public String update() {
return "notes";
}

public String delete() {
Note delNote = (Note) noteListTable.getRowData();
nDao.deleteNote(delNote);
return "notes";
}

public String cancel() {
return "notes";
}

public Note getNote() {
return note;
}

public void setNote(Note note) {
this.note = note;
}

public NoteDao getNDao() {
return nDao;
}

public UIData getNoteListTable() {
return noteListTable;
}

public void setNoteListTable(UIData noteListTable) {
this.noteListTable = noteListTable;
}

public List<Note> getNoteList() {


noteList = nDao.selectNotes(worktype, product); //
return noteList;
}

public void setNoteList(List<Note> noteList) {
this.noteList = noteList;
}

public void setNDao(NoteDao dao) {
nDao = dao;
}

public String getProduct() {
return product;
}

public void setProduct(String product) {
this.product = product;
}

public String getWorktype() {
return worktype;
}

public void setWorktype(String worktype) {
this.worktype = worktype;
}

public NoteCategory getNoteCategory() {
return noteCategory;
}

public void setNoteCategory(NoteCategory noteCategory) {
this.noteCategory = noteCategory;
}

public NoteSubCategory getNoteSubCategory() {
return noteSubCategory;
}

public void setNoteSubCategory(NoteSubCategory noteSubCategory) {
this.noteSubCategory = noteSubCategory;
}

public int getNoteId() {
return noteId;
}

public void setNoteId(int noteId) {
this.noteId = noteId;
}

public SybaseSqlDao getSybaseDao() {
return sybaseDao;
}

public void setSybaseDao(SybaseSqlDao sybaseDao) {
this.sybaseDao = sybaseDao;
}

public List<SelectItem> getSelectWorktypes() {
selectWorktypes.clear();

worktypeList = this.getWorktypeList();

for (String strt : worktypeList) {

SelectItem si = new SelectItem();
si.setValue(strt);
si.setLabel(strt);
si.setDescription(strt);
selectWorktypes.add(si);
}

return selectWorktypes;
}

public void setSelectWorktypes(List<SelectItem> selectWorktypes) {

this.selectWorktypes = selectWorktypes;
}

public List<String> getWorktypeList() {

worktypeList = sybaseDao.selectWorktypes();
return worktypeList;
}

public void setWorktypeList(List<String> worktypeList) {
this.worktypeList = worktypeList;
}

public List<Product> getProductList() {

productList = sybaseDao.selectProducts();
return productList;
}

public void setProductList(List<Product> productList) {
this.productList = productList;
}

public List<SelectItem> getSelectProducts() {
selectProducts.clear();

productList = this.getProductList();

for (Product prod : productList) {

SelectItem si = new SelectItem();
si.setValue(prod);
si.setLabel(prod.toString());
si.setDescription(prod.toString());
selectProducts.add(si);
}

return selectProducts;
}

public void setSelectProducts(List<SelectItem> selectProducts) {
this.selectProducts = selectProducts;
}

public void processValueChange(ValueChangeEvent arg0) {

if (arg0.getComponent().getId().equalsIgnoreCase("productList")) {
this.setProduct(arg0.getNewValue().toString());

}
if (arg0.getComponent().getId().equalsIgnoreCase("worktypeList")) {
this.setWorktype(arg0.getNewValue().toString());
}

}

}

faces-config.xml

 <?xml version="1.0"?>

<!DOCTYPE faces-config PUBLIC
"-//Sun Microsystems, Inc.//DTD JavaServer Faces Config 1.0//EN"
"http://java.sun.com/dtd/web-facesconfig_1_0.dtd">

<faces-config>

<lifecycle>
<phase-listener>
<package>.utils.NoCachePhaseListener
</phase-listener>
</lifecycle>

<managed-bean>
<managed-bean-name>pc_userBacker</managed-bean-name>
<managed-bean-class>
<package>.web.backer.UserBacker
</managed-bean-class>
<managed-bean-scope>session</managed-bean-scope>
</managed-bean>

<managed-bean>
<managed-bean-name>pc_noteCategoryListBacker</managed-bean-name>
<managed-bean-class>
<package>.web.backer.note.NoteCategoryListBacker
</managed-bean-class>
<managed-bean-scope>request</managed-bean-scope>
</managed-bean>

<managed-bean>
<managed-bean-name>
pc_noteSubCategoryListBacker
</managed-bean-name>
<managed-bean-class>
<package>.web.backer.note.NoteSubCategoryListBacker
</managed-bean-class>
<managed-bean-scope>request</managed-bean-scope>
</managed-bean>

<managed-bean>
<managed-bean-name>pc_noteListBacker</managed-bean-name>
<managed-bean-class>
<package>.web.backer.note.NoteListBacker
</managed-bean-class>
<managed-bean-scope>session</managed-bean-scope>
</managed-bean>

<managed-bean>
<managed-bean-name>pc_statusListBacker</managed-bean-name>
<managed-bean-class>
<package>.web.backer.status.StatusListBacker
</managed-bean-class>
<managed-bean-scope>request</managed-bean-scope>
</managed-bean>

<managed-bean>
<managed-bean-name>pc_statusReasonBacker</managed-bean-name>
<managed-bean-class>
<package>.web.backer.status.StatusReasonBacker
</managed-bean-class>
<managed-bean-scope>request</managed-bean-scope>
</managed-bean>


<!-- Notes -->
<navigation-rule>
<from-view-id>/jsp/notes/notes.jsp</from-view-id>
<navigation-case>
<from-action>#{pc_noteListBacker.edit}</from-action>
<from-outcome>success</from-outcome>
<to-view-id>/jsp/notes/noteedit.jsp</to-view-id>
</navigation-case>
<navigation-case>
<from-action>#{pc_noteListBacker.insert}</from-action>
<from-outcome>success</from-outcome>
<to-view-id>/jsp/notes/notenew.jsp</to-view-id>
</navigation-case>


</navigation-rule>


<!-- Note Categories -->
<navigation-rule>
<from-view-id>/jsp/notes/notecategories.jsp</from-view-id>
<navigation-case>
<from-action>#{pc_noteCategoryListBacker.edit}</from-action>
<from-outcome>success</from-outcome>
<to-view-id>/jsp/notes/notecategoryedit.jsp</to-view-id>
</navigation-case>
<navigation-case>
<from-action>
#{pc_noteCategoryListBacker.insert}
</from-action>
<from-outcome>success</from-outcome>
<to-view-id>/jsp/notes/notecategorynew.jsp</to-view-id>
</navigation-case>


</navigation-rule>

<!-- Note Subcategories -->
<navigation-rule>
<from-view-id>/jsp/notes/notesubcategories.jsp</from-view-id>
<navigation-case>
<from-action>
#{pc_noteSubCategoryListBacker.edit}
</from-action>
<from-outcome>success</from-outcome>
<to-view-id>/jsp/notes/notesubcategoryedit.jsp</to-view-id>
</navigation-case>
<navigation-case>
<from-action>
#{pc_noteSubCategoryListBacker.insert}
</from-action>
<from-outcome>success</from-outcome>
<to-view-id>/jsp/notes/notesubcategorynew.jsp</to-view-id>
</navigation-case>
</navigation-rule>

<!-- Statuses -->
<navigation-rule>
<from-view-id>/jsp/statuses/statuses.jsp</from-view-id>
<navigation-case>
<from-action>#{pc_statusListBacker.edit}</from-action>
<from-outcome>success</from-outcome>
<to-view-id>/jsp/statuses/statusedit.jsp</to-view-id>
</navigation-case>
<navigation-case>
<from-action>#{pc_statusListBacker.insert}</from-action>
<from-outcome>success</from-outcome>
<to-view-id>/jsp/statuses/statusnew.jsp</to-view-id>
</navigation-case>
</navigation-rule>

<!-- Status Reasons -->
<navigation-rule>
<from-view-id>/jsp/statuses/statusreasons.jsp</from-view-id>
<navigation-case>
<from-action>#{pc_statusReasonBacker.edit}</from-action>
<from-outcome>success</from-outcome>
<to-view-id>/jsp/statuses/statusreasonedit.jsp</to-view-id>
</navigation-case>
<navigation-case>
<from-action>#{pc_statusReasonBacker.insert}</from-action>
<from-outcome>success</from-outcome>
<to-view-id>/jsp/statuses/statusreasonnew.jsp</to-view-id>
</navigation-case>
</navigation-rule>

<!-- static and general actions-->
<!-- what page the action is coming from doesn't matter here -->
<navigation-rule>

<navigation-case>
<from-outcome>login</from-outcome>
<to-view-id>/login.jsp</to-view-id>
</navigation-case>

<navigation-case>
<from-outcome>menu</from-outcome>
<to-view-id>/menu.jsp</to-view-id>
</navigation-case>

<!-- Notes -->
<navigation-case>
<from-outcome>notes</from-outcome>
<to-view-id>/jsp/notes/notes.jsp</to-view-id>
</navigation-case>


<!-- Note Categories -->
<navigation-case>
<from-outcome>notecategories</from-outcome>
<to-view-id>/jsp/notes/notecategories.jsp</to-view-id>
</navigation-case>

<!-- Note Subcategories -->
<navigation-case>
<from-outcome>notesubcategories</from-outcome>
<to-view-id>/jsp/notes/notesubcategories.jsp</to-view-id>
</navigation-case>

<!-- Statuses -->
<navigation-case>
<from-outcome>statuses</from-outcome>
<to-view-id>/jsp/statuses/statuses.jsp</to-view-id>
</navigation-case>



<!-- Status Reasons -->
<navigation-case>
<from-outcome>statusreasons</from-outcome>
<to-view-id>/jsp/statuses/statusreasons.jsp</to-view-id>
</navigation-case>


</navigation-rule>
</faces-config>

最佳答案

我只看了一眼代码,但我猜这部分问题可能出在这里:

public void processValueChange(ValueChangeEvent arg0) {
if (arg0.getComponent().getId().equalsIgnoreCase("productList")) {
this.setProduct(arg0.getNewValue().toString());

}
if (arg0.getComponent().getId().equalsIgnoreCase("worktypeList")) {
this.setWorktype(arg0.getNewValue().toString());
}
}

如果您阅读 valueChangeListener 的文档type属性,它是这样说的:

Fully qualified Java class name of a ValueChangeListener to be created and registered.

这意味着您将至少拥有三个 <package>.web.backer.note.NoteListBacker 实例- 两个创建为监听器,第三个创建为托管 bean。最后一个是表绑定(bind)的唯一一个,监听器中的任何状态更改都是无关紧要的。

修复:

  1. 没有NoteListBacker实现 ValueChangeListener ;没有意义。
  2. 要么绑定(bind)selectOneMenuvalueChangeListener属性为 #{pc_noteListBacker.valueChange}方法(有关详细信息,请参阅文档)有一个单独的 ValueChangeListener查找 pc_noteListBacker 的实现直接从 session 使用 FacesContext .

关于java - 基于 selectOneMenu 值更新 JSF 数据表,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/1590484/

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