提问人：JakoBolt 提问时间：1/7/2023 最后编辑：JakoBolt 更新时间：1/8/2023 访问量：53
参数在使用 <p：commandButton> 时变为 null （Mojarra 2.3）
parameter goes null when using <p:commandButton> (Mojarra 2.3)
问：
xhtml 文件正在获取一个 Integer 参数，该参数另存为 deck_id。在该 xhtml 文件中，它被正常使用，并且与标头中一样工作，但是当我想将其与 <p：commandbutton> 结合使用时，参数变为 null。我不知道为什么，也不知道如何解决它。 由于我是编程新手，这是我的第一个项目，我现在迷路了，几个小时的谷歌也无济于事。
该deck_id在 #{deckListController.getDeckByDeckId（deck_id）.name} 中工作正常，但在 <p：commandButton oncomplete=“PF（'newCardDialog'）.show（）” icon=“pi pi-plus” value=“新卡” title=“新”>
-->通过按下“新建卡”按钮，我刚刚添加了一个函数，该函数在控制台中打印deck_id（如您在newCardDialog中看到的那样），它打印0，但它应该是给定卡组的ID。
XHTML 文件组 - 详细信息视图
<ui:param name="deck_id" value="#{param['deck_id']}"/>
<ui:define name="content">
<h1>Cards of
#{deckListController.getDeckByDeckId(deck_id).name}</h1>
<div class="deck-detail">
<!-- TODO: ADD NEW CARD -->
<h:form id="newCardForm">
<div class="txt-r">
<!-- TODO: only see for the creator of the deck -->
<!-- one Problem -> deckId somehow is null -> exception becaus of unboxing null is wrong -->
<p:commandButton oncomplete="PF('newCardDialog').show()"
icon="pi pi-plus" value="new card" title="New">
<!-- rendered="#{deckListController.getDeckByDeckId(param['deck_id']).createUser == sessionInfoBean.currentUser}"> -->
</p:commandButton>
<p:commandButton oncomplete="PF('deckEditDialog').show()"
icon="pi pi-pencil" value="edit deck" title="Edit" styleClass="btn-light">
<f:setPropertyActionListener
value="#{deckListController.getDeckByDeckId(deck_id)}"
target="#{deckDetailController.deck}" />
</p:commandButton>
</div>
<br />
<!-- new Card dialog -->
<p:dialog header="Create new Card" id="newCardDialog"
widgetVar="newCardDialog" modal="true" showEffect="fade"
hideEffect="fade" resizable="false" width="400">
<p:outputPanel id="newCardData">
<p:messages id="messages" closable="true" autoUpdate="true" />
<h:panelGrid columns="2">
<p:outputLabel for="cardContentFront" value="Question: " />
<!-- TODO: required field check is not working yet -->
<p:inputTextarea id="cardContentFront"
value="#{newCardController.card.contentFront}" required="true"
requiredMessage="Question of card is required" />
<p:outputLabel for="cardContentBack" value="Answer: " />
<p:inputTextarea id="cardContentBack"
value="#{newCardController.card.contentBack}" required="true"
requiredMessage="Answer of card is required" />
</h:panelGrid>
<p:separator />
<h:panelGrid columns="2">
<p:outputLabel for="flipped" value="Flipped: " />
<p:selectBooleanCheckbox id="flipped"
value="#{newCardController.card.flipped}" />
</h:panelGrid>
<p:separator />
<h:panelGrid columns="3">
<p:commandButton value="Cancel"
onclick="PF('newCardDialog').hide()" styleClass="btn-light" />
<!-- TODO: after create refreshing of the table -->
<p:commandButton value="Create"
actionListener="#{cardListController.print(deck_id)}"
oncomplete="PF('newCardDialog').hide()" />
<!-- action="#{newCardController.doCreateCard(deck_id)}" -->
<!-- update="cardForm" /> -->
</h:panelGrid>
</p:outputPanel>
</p:dialog>
<!-- Edit deck dialog -->
<p:dialog header="Edit #{deckListController.getDeckByDeckId(param['deck_id']).name}" id="deckEditDialog"
widgetVar="deckEditDialog" modal="true" showEffect="fade"
hideEffect="fade" resizable="false" width="400">
<p:outputPanel id="deckData" rendered="#{ empty deckDetailController.deck}">
<h:panelGrid columns="2">
<p:outputLabel for="name" value="Deck Name: " />
<p:inputText id="name" disabled="false" />
<p:outputLabel for="description" value="Desription: " />
<p:inputTextarea id="description" disabled="false" />
</h:panelGrid>
<h:panelGrid columns="2">
<p:outputLabel for="public" value="Public: " />
<p:selectBooleanCheckbox id="public" />
</h:panelGrid>
<h:panelGrid columns="3">
<p:commandButton value="Cancel"
onclick="PF('deckEditDialog').hide()" styleClass="btn-light" />
<p:commandButton value="Reload"
update=":cardForm:cardView"
styleClass="btn-light" />
<p:commandButton value="Save"
oncomplete="PF('deckEditDialog').hide()"
update=":cardForm:cardView" />
</h:panelGrid>
</p:outputPanel>
</p:dialog>
</h:form>
<h:form id="cardForm">
<p:dataGrid id="cardView" var="card"
value="#{cardListController.getEnabledCardsOfOneDeckByDeckId(deck_id)}"
columns="4" paginator="false">
<p:dataViewGridItem>
<h3 class="card-name">Question:</h3>
<div class="card-grid-item-content">
<p class="card-contentFront">#{card.contentFront}</p>
</div>
<div class="open-btns txt-r">
<!-- TODO: edit and delete button in Progress -->
<p:commandButton update=":cardForm:cardEditDialog"
oncomplete="PF('cardEditDialog').show()"
type="button" title="edit" value="edit" styleClass="btn-light"
rendered="#{card.createUser == sessionInfoBean.currentUser}">
<f:setPropertyActionListener value="#{card}"
target="#{cardDetailController.card}" />
</p:commandButton>
<p:commandButton title="delete"
action="#{cardDetailController.doDisableCard}"
rendered="#{card.createUser == sessionInfoBean.currentUser}">
<f:setPropertyActionListener value="#{card}"
target="#{cardDetailController.card}" />
<p:confirm header="Confirmation"
message="Are you sure you want do delete this card?"
icon="pi pi-exclamation-triangle" />
</p:commandButton>
</div>
</p:dataViewGridItem>
</p:dataGrid>
<!-- Edit card dialog -->
<p:dialog header="Edit Card" id="cardEditDialog"
widgetVar="cardEditDialog" modal="true" showEffect="fade"
hideEffect="fade" resizable="false" width="400">
<p:outputPanel id="cardData"
rendered="#{not empty cardDetailController.card}">
<h:panelGrid columns="2">
<p:outputLabel for="contentFront" value="Question: " />
<p:inputText id="contentFront"
value="#{cardDetailController.card.contentFront}"
disabled="false" />
<p:outputLabel for="contentBack" value="Answer: " />
<p:inputTextarea id="contentBack"
value="#{cardDetailController.card.contentBack}"
disabled="false" />
</h:panelGrid>
<h:panelGrid columns="3">
<p:commandButton value="Cancel"
onclick="PF('cardEditDialog').hide()" styleClass="btn-light" />
<p:commandButton value="Reload"
action="#{cardDetailController.doReloadCard()}"
update=":cardsForm:cardView" styleClass="btn-light" />
<p:commandButton value="Save"
action="#{cardDetailController.doSaveCard()}"
oncomplete="PF('cardEditDialog').hide()"
update=":cardForm:cardView" />
</h:panelGrid>
</p:outputPanel>
</p:dialog>
<!-- Deletion confirmation dialog -->
<p:confirmDialog global="true" showEffect="fade" hideEffect="fade"
width="300">
<p:commandButton value="Yes" type="button"
styleClass="ui-confirmdialog-yes btn-light" />
<p:commandButton value="No" type="button"
styleClass="ui-confirmdialog-no" />
</p:confirmDialog>
</h:form>
</div>
</ui:define>
</ui:composition>
xhtml 文件，其中参数被赋予 deck-detail 视图
<ui:composition xmlns="http://www.w3c.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"
xmlns:p="http://primefaces.org/ui">
<div class="personal-decks">
<h:form id="newDeckForm">
<div class="txt-r">
<p:commandButton oncomplete="PF('newDeckDialog').show()"
icon="pi pi-plus" value="new deck" title="New" />
</div>
<br />
<!-- NEW deck dialog-->
<p:dialog header="Create new Deck" id="newDeckDialog"
widgetVar="newDeckDialog" modal="true" showEffect="fade"
hideEffect="fade" resizable="false" width="400">
<p:outputPanel id="newDeckData">
<p:messages id="messages" closable="true" autoUpdate="true" />
<h:panelGrid columns="2">
<p:outputLabel for="deckName" value="Deck Name: " />
<!-- TODO: required field check is not working yet -->
<p:inputText id="deckName" value="#{newDeckController.deck.name}"
required="true" requiredMessage="Name of deck is required" />
<p:outputLabel for="deckDescription" value="Description: " />
<p:inputTextarea id="deckDescription"
value="#{newDeckController.deck.description}" disabled="false" />
</h:panelGrid>
<h:panelGrid columns="3">
<p:commandButton value="Cancel"
onclick="PF('newDeckDialog').hide()" styleClass="btn-light" />
<p:commandButton value="Create"
action="#{newDeckController.doCreateDeck()}">
</p:commandButton>
</h:panelGrid>
</p:outputPanel>
</p:dialog>
</h:form>
<!-- PRIVATE decks view-->
<h:form id="privateDecksForm">
<p:dataGrid id="decksView"
var="deck"
value="#{deckListController.userDecks}" columns="4"
paginator="false">
<p:dataViewGridItem>
<div class="edit-btns">
<p:commandButton update=":deckTabs:privateDecksForm:deckEditDialog"
oncomplete="PF('deckEditDialog').show()" icon="pi pi-pencil"
title="Edit">
<f:setPropertyActionListener value="#{deck}"
target="#{deckDetailController.deck}" />
</p:commandButton>
<p:commandButton action="#{deckDetailController.doDisableDeck}"
icon="pi pi-trash" title="Delete"
update=":deckTabs:privateDecksForm:decksView">
<f:setPropertyActionListener value="#{deck}"
target="#{deckDetailController.deck}" />
<p:confirm header="Confirmation"
message="Are you sure that you want to delete this deck? You cannot undo this operation."
icon="pi pi-exclamation-triangle" />
</p:commandButton>
</div>
<h3 class="deck-name">#{deck.name}</h3>
<div class="deck-grid-item-content">
<p class="deck-description">#{deck.description}</p>
<p class="deck-no-cards">
New cards: #{deckDetailController.getNewCardsCount(deck)}
<br />
Repeatable cards: #{deckDetailController.getRepeatableCardsCount(deck)}
</p>
</div>
<div class="open-btns txt-r">
<p:linkButton outcome="deck-detail" value="view"
styleClass="btn-light">
<f:param name="deck_id" value="#{deck.deckID}" />
</p:linkButton>
<p:linkButton outcome="learning-view" value="learn">
<f:param name="deck_id" value="#{deck.deckID}" />
</p:linkButton>
</div>
</p:dataViewGridItem>
</p:dataGrid>
<!-- Edit deck dialog-->
<p:dialog header="Edit Deck" id="deckEditDialog"
widgetVar="deckEditDialog" modal="true" showEffect="fade"
hideEffect="fade" resizable="false" width="400">
<p:outputPanel id="deckData"
rendered="#{not empty deckDetailController.deck}">
<h:panelGrid columns="2">
<p:outputLabel for="name" value="Deck Name: " />
<p:inputText id="name" value="#{deckDetailController.deck.name}"
disabled="false" />
<p:outputLabel for="description" value="Description: " />
<p:inputTextarea id="description"
value="#{deckDetailController.deck.description}" disabled="false" />
</h:panelGrid>
<h:panelGrid columns="2">
<p:outputLabel for="public" value="Public: " />
<p:selectBooleanCheckbox id="public"
value="#{deckDetailController.deck.publiclyShared}" />
</h:panelGrid>
<h:panelGrid columns="3">
<p:commandButton value="Cancel"
onclick="PF('deckEditDialog').hide()"
styleClass="btn-light" />
<p:commandButton value="Reload"
action="#{deckDetailController.doReloadDeck()}"
update=":deckTabs:privateDecksForm:decksView"
styleClass="btn-light" />
<p:commandButton value="Save"
action="#{deckDetailController.doSaveDeck()}"
oncomplete="PF('deckEditDialog').hide()"
update=":deckTabs:privateDecksForm:decksView" />
</h:panelGrid>
</p:outputPanel>
</p:dialog>
<!-- Deletion confirmation dialog -->
<p:confirmDialog global="true" showEffect="fade" hideEffect="fade"
width="300">
<p:commandButton value="Yes" type="button"
styleClass="ui-confirmdialog-yes btn-light" />
<p:commandButton value="No" type="button"
styleClass="ui-confirmdialog-no" />
</p:confirmDialog>
</h:form>
</div>
</ui:composition>
cardList控制器
package at.qe.skeleton.ui.controllers;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.Collection;
import at.qe.skeleton.model.Deck;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Component;
import at.qe.skeleton.model.Card;
import at.qe.skeleton.services.CardService;
/**
* Controller for the Card list view.
*
* This class is part of the skeleton project provided for students of the
* course "Software Architecture" offered by Innsbruck University.
*/
@Component
@Scope("view")
public class CardListController implements Serializable {
@Autowired
private CardService cardService;
/**
* Returns a list of all Cards.
*
* @return Collection
*/
public Collection<Card> getCards() {
return cardService.getAll();
}
/**
* Returns a list of all Cards.
*
* @return Collection
*/
public Collection<Card> getEnabledCardsOfOneDeckByDeckId(Integer deckId) {
if(deckId == null)
return new ArrayList<>();
return cardService.findAllEnabledCardsByDeckId(deckId);
}
public void print(int deckId) {
System.out.println("deckId is " + deckId);
}
/**
* Returns the current Deck.
*
* @return Deck
*/
public Deck getDeck(Integer deckId) {
return cardService.findDeck(deckId);
}
}
我试图将 action 更改为 actionListener，正如有人在论坛上所说的那样。 我发现这可能与 Mojarra 有关，但并不真正理解为什么。
答： 暂无答案
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