Question

我在Primefaces数据表中存在依赖selectonemenus的问题，我没有找到答案。我认为其他人也有同样的问题所以必须有一个解决方案。发生的事情是，当我在数据表中编辑一行然后取消编辑时，我对第一个selectonemenu所做的任何更改都保留在后备对象中，并且不会恢复为其原始值。以下是重现的步骤：

打开一行进行编辑
更改第一列中的值（您可以验证第二列列表是否已更改。
取消行编辑
第一列值未恢复为原始

我认为它与支持bean的监听器的ajax调用有关。这就像价值即将发布。这不是理想的行为。有没有解决这个问题？

我在下面提供了代码示例：

<html xmlns="http://www.w3.org/1999/xhtml"  
xmlns:h="http://java.sun.com/jsf/html"  
xmlns:f="http://java.sun.com/jsf/core" 
xmlns:ui="http://java.sun.com/jsf/facelets" 
xmlns:p="http://primefaces.org/ui">  

<f:view contentType="text/html">
<h:head>  
    <title>
        <ui:insert name="title">Example One</ui:insert>
    </title>
</h:head>  

<h:body>
    <h:form id="form">
        <p:growl id="msgs" showDetail="true"/>
        <p:messages/>
        <p:dataTable id="editTable" var="item" value="#{exampleOne.items}" editable="true" scrollable="false" scrollHeight="350" rowIndexVar="rowIndex">
            <p:ajax event="rowEdit" listener="#{exampleOne.onRowEdit}" update=":form:msgs" />
            <p:ajax event="rowEditCancel" listener="#{exampleOne.onRowCancel}" update=":form:msgs" />
            <p:ajax event="rowEditInit" listener="#{exampleOne.onRowInit}" />

            <p:column headerText="Name" style="width: 100px;">
                <p:cellEditor>
                    <f:facet name="output"><h:outputText value="#{item.name}"/></f:facet>
                    <f:facet name="input"><p:inputText id="tagId" value="#{item.name}" style="width:100%"/></f:facet>
                </p:cellEditor>
            </p:column>

            <p:column headerText="Column One" style="width: 200px;">
                <p:cellEditor>
                    <f:facet name="output"><h:outputText value="#{item.columnOneValue}"/></f:facet>
                    <f:facet name="input">
                        <p:selectOneMenu id="columnOneId" value="#{item.columnOneValue}" style="width:100%">
                            <p:ajax event="change" listener="#{exampleOne.onColumnOneChange}" update="columnTwoId" />
                            <f:selectItem itemLabel="Select Column One" itemValue="" noSelectionOption="true" />
                            <f:selectItems value="#{exampleOne.columnOneSelectItems}" var="columnOneSelectItem" itemLabel="#{columnOneSelectItem}" itemValue="#{columnOneSelectItem}"/>
                        </p:selectOneMenu>
                    </f:facet>
                </p:cellEditor>
            </p:column>

            <p:column headerText="Column Two" style="width: 125px;">
                <p:cellEditor>
                    <f:facet name="output"><h:outputText value="#{item.columnTwoValue}"/></f:facet>
                    <f:facet name="input">
                        <p:selectOneMenu id="columnTwoId" value="#{item.columnTwoValue}" style="width:100%">
                            <f:selectItem itemLabel="Select Column Two" itemValue="" noSelectionOption="true" />
                            <f:selectItems value="#{exampleOne.columnTwoSelectItems}" var="columnTwoSelectItem" itemLabel="#{columnTwoSelectItem}" itemValue="#{columnTwoSelectItem}"/>
                        </p:selectOneMenu>
                    </f:facet>
                </p:cellEditor>
            </p:column>

            <p:column headerText="Edit" style="width: 75px;">
                <p:rowEditor />
            </p:column>


        </p:dataTable>
    </h:form>
</h:body>
</f:view>
</html>  

package com.windhaven_consulting.breezy.controller.ui;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.annotation.PostConstruct;
import javax.faces.application.FacesMessage;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;
import javax.faces.component.UIOutput;
import javax.faces.context.FacesContext;
import javax.faces.event.AjaxBehaviorEvent;

import org.apache.commons.lang3.StringUtils;
import org.primefaces.event.RowEditEvent;

import com.windhaven_consulting.breezy.component.MountedBoard;

@ManagedBean
@SessionScoped
public class ExampleOne implements Serializable {

private List<Item> items = new ArrayList<Item>();

private List<String> columnOneSelectItems = new ArrayList<String>();

private Map<String, List<String>> columnOneToColumnTwoMap = new HashMap<String, List<String>>();

private List<String> columnTwoSelectItems;

/**
 * 
 */
private static final long serialVersionUID = 1L;

@PostConstruct
public void postConstruct() {
    items.add(new Item("item 1", "Select One", "Select One A"));
    items.add(new Item("item 2", "Select Two", "Select Two A"));
    items.add(new Item("item 3", "Select Three", "Select Three A"));

    columnOneSelectItems.add("Select One");
    columnOneSelectItems.add("Select Two");
    columnOneSelectItems.add("Select Three");

    List<String> columnTwoSelectItems = new ArrayList<String>();
    columnTwoSelectItems.add("Select One One");
    columnTwoSelectItems.add("Select One Two");
    columnTwoSelectItems.add("Select One Three");
    columnOneToColumnTwoMap.put("Select One", columnTwoSelectItems);

    columnTwoSelectItems = new ArrayList<String>();
    columnTwoSelectItems.add("Select Two One");
    columnTwoSelectItems.add("Select Two Two");
    columnTwoSelectItems.add("Select Two Three");
    columnOneToColumnTwoMap.put("Select Two", columnTwoSelectItems);

    columnTwoSelectItems = new ArrayList<String>();
    columnTwoSelectItems.add("Select Three One");
    columnTwoSelectItems.add("Select Three Two");
    columnTwoSelectItems.add("Select Three Three");
    columnOneToColumnTwoMap.put("Select Three", columnTwoSelectItems);
}

public void onRowInit(RowEditEvent event) {
}

public void onRowEdit(RowEditEvent event) {
}

public void onRowCancel(RowEditEvent event) {
}

public void onColumnOneChange(final AjaxBehaviorEvent event) {
    String selectedValue = (String) ((UIOutput) event.getSource()).getValue();

    if(StringUtils.isNotEmpty(selectedValue)) {
        columnTwoSelectItems = columnOneToColumnTwoMap.get(selectedValue);
    }
    else {
        columnTwoSelectItems = Collections.emptyList();
    }
}

public List<Item> getItems() {
    return items;
}

public List<String> getColumnOneSelectItems() {
    return columnOneSelectItems;
}

public List<String> getColumnTwoSelectItems() {
    return columnTwoSelectItems;
}
}

取消行编辑p：datatable不会还原相关selectonemenus

0 个答案: