Question

我写了一些代码-我需要使用inputTextarea添加和删除动态行。它可以工作，但是在删除并添加一些值后-inputTextarea中的值更改不正确。我用

    <jsf.version>2.2.8</jsf.version>
    <primefaces.version>3.0</primefaces.version>

我的豆子

@ManagedBean
@SessionScoped
public class HelloWorld {
    private final static List<String> ENTITIES = Arrays.asList(new String[]{"1", "2", "3", "4", "5"});

    @PostConstruct
    public void init() {
        selectedFields = ENTITIES.stream().filter(s -> !"5".equals(s)).collect(Collectors.toSet());
        availableFields = ENTITIES.stream().filter(s -> "5".equals(s)).collect(Collectors.toSet());
        values.put("1", "1");
        values.put("2", "2");
        values.put("3", "3");
        values.put("4", "4");
    }

    private String selectedType = "";
    private Set<String> availableFields;
    private Set<String> selectedFields;
    private Map<String, String> values = new HashMap<String, String>();

    public Set<String> getAvailableFields() {
        return availableFields;
    }

    public void setAvailableFields(Set<String> availableFields) {
        this.availableFields = availableFields;
    }

    public Set<String> getSelectedFields() {
        return selectedFields;
    }

    public void setSelectedFields(Set<String> selectedFields) {
        this.selectedFields = selectedFields;
    }

    public Map<String, String> getValues() {
        return values;
    }

    public void setValues(Map<String, String> values) {
        this.values = values;
    }

    public void changeOfferType(String type) {
        Optional<String> f = availableFields.stream().filter(s -> s.equals(type)).findFirst();
        selectedFields.add(f.get());
        availableFields.remove(f.get());
        values.put(f.get(), null);
    }

    public void onDelete() {
        String type = FacesContext.getCurrentInstance().getExternalContext().getRequestParameterMap().get("type");
        Optional<String> f = selectedFields.stream().filter(s -> s.equals(type)).findFirst();
        selectedFields.remove(f.get());
        availableFields.add(f.get());
        values.put(f.get(), null);
    }

    public String getSelectedType() {
        return selectedType;
    }

    public void setSelectedType(String selectedType) {
        this.selectedType = selectedType;
    }
}

我的xhtml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
      xmlns:h="http://java.sun.com/jsf/html"
      xmlns:p="http://primefaces.org/ui"
      xmlns:f="http://java.sun.com/jsf/core"
      xmlns:c="http://java.sun.com/jsp/jstl/core">

<h:head>
    <title>PrimeFaces Hello World Example</title>
</h:head>

<h:body>
    <h:form>
        <p:panel id="main">
            <h:panelGrid columns="2">
                <h:outputText value="Add value"
                              style="vertical-align: top; width: 200px;"/>
                <p:selectOneMenu
                        widgetVar="offerType"
                        style="width: 350px"
                        value="#{helloWorld.selectedType}">
                    <f:selectItem itemValue="#{null}" itemLabel=""/>
                    <f:selectItems value="#{helloWorld.availableFields}" var="def" itemLabel="#{def}" itemValue="#{def}"/>
                    <p:ajax event="change"
                            update="main"
                            listener="#{helloWorld.changeOfferType(helloWorld.selectedType)}"/>/>
                </p:selectOneMenu>
            </h:panelGrid>
            <h:panelGroup id="panelRepeatWrapper">
                <c:forEach id="panelRepeat" items="#{helloWorld.selectedFields}" var="field">
                    <p:remoteCommand name="rc" update="main" action="#{helloWorld.onDelete}"/>
                    <h:panelGrid columns="3">
                        <h:outputText value="#{field}"
                                      style="vertical-align: top; width: 200px;"/>
                        <h:inputTextarea value="#{helloWorld.values[field]}"
                                         style="width: 550px; height: 50px;"/>
                        <p:commandButton value="x" onclick="#{'rc({type : \''.concat(field).concat('\'})')}">
                        </p:commandButton>
                    </h:panelGrid>
                </c:forEach>
            </h:panelGroup>
        </p:panel>
    </h:form>
</h:body>
</html>

稍后，我添加带有示例的github repo，它可能在码头上运行

以下图片显示-删除并添加第二个元素后发生的情况-第三个元素的值不是3，而是2 代码有什么问题？！

wrong

使用c：forEach标签动态添加和删除元素

0 个答案: