如何使用质数可选数据表迭代HashMap [英] How to iterate a HashMap with primefaces selectable datatable
问题描述
我尝试了不同的解决方案，但在我的情况下没有任何解决方案.我希望该数据表中的所有行都是可选的.问题似乎是<ui:repeat可能覆盖了对象...
I have tried different solutions but none is working in my case. I want all the rows in this datatable to be selectable. The problem seems to be the <ui:repeatthat is probably overriding the objects...
我的豆子:
@ManagedBean
@ViewScoped
public class Chat {
private static Map<String, List<ChatObject>> chat = new LinkedHashMap<String, List<ChatObject>>();
private ChatObject selectedChatObject;
public void onChatRowSelection(){
if(getSelectedChatObject() != null){
System.out.println("test");
}
}
public List<Map.Entry<String, List<ChatObject>>> getChatList() {
Set<Map.Entry<String, List<ChatObject>>> productSet = chat.entrySet();
return new ArrayList<Map.Entry<String, List<ChatObject>>>(productSet);
}
@PostConstruct
public void postConstructMethod() {
if(chat.isEmpty()){
List<ChatObject> objectsList1 = new ArrayList<ChatObject>();
objectsList1.add(new ChatObject("3369818", "1", "1"));
objectsList1.add(new ChatObject("3369819", "2", "2"));
objectsList1.add(new ChatObject("3369820", "3", "3"));
chat.put("Chat Topic 1", objectsList1);
List<ChatObject> objectsList2 = new ArrayList<ChatObject>();
objectsList2.add(new ChatObject("3369813", "4", "4"));
objectsList2.add(new ChatObject("3369815", "5", "5"));
chat.put("Chat Topic 2", objectsList2);
}
}
public ChatObject getSelectedChatObject() {
return selectedChatObject;
}
public void setSelectedChatObject(ChatObject selectedChatObject) {
this.selectedChatObject = selectedChatObject;
}
}
我的JSF:
<!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:ui="http://xmlns.jcp.org/jsf/facelets"
xmlns:h="http://xmlns.jcp.org/jsf/html"
xmlns:f="http://xmlns.jcp.org/jsf/core"
xmlns:p="http://primefaces.org/ui"
xmlns:fn="http://java.sun.com/jsp/jstl/functions">
<h:form id="form" enctype="multipart/form-data" acceptcharset="ISO-8859-1">
<ui:repeat value="#{chat.chatList}" var="chatEntry">
<h2><h:outputText value="#{chatEntry.key}" /></h2>
<br />
<p:dataTable
value="#{chatEntry.value}"
var="chatEntryVar"
widgetVar="chatTableWV"
styleClass="geralBorderless"
style="cursor:pointer"
rowKey="#{chatEntryVar.id}"
rendered="true"
selectionMode="single"
selection="#{chat.selectedChatObject}"
paginatorAlwaysVisible="false">
<p:ajax event="rowSelect"
listener="#{chat.onChatRowSelection}"
oncomplete="chatTableWV.unselectAllRows();">
</p:ajax>
<p:column>
<h:outputText value="#{chatEntryVar.name}" />
</p:column>
</p:dataTable>
</ui:repeat>
</h:form>
</html>
我的地图中成功显示了我地图中的所有5个ChatObject.但是，当我单击与添加到地图中的第二列表相关的行时，onChatRowSelection方法将仅打印测试". 当我单击添加的第一个列表中的行时 objectList1，当系统进入onChatRowSelection方法时，selectedChatObject将为空.我该如何解决?
All the 5 ChatObject in my Map are successfully shown in my page. But onChatRowSelection method will only print "test" when I click in the rows related to the second list I added to my map: objectList2. When I click in the lines from the first list I added objectList1, when the system enters in the onChatRowSelection method, selectedChatObject will be null. How can I fix this?
推荐答案
您的问题在这里:
<ui:repeat ...>
<p:dataTable ... widgetVar="chatTableWV">
<p:ajax ... oncomplete="chatTableWV.unselectAllRows();">
在JavaScript范围内为多个数据表分配了完全相同的widgetVar名称.实际上，将生成以下JavaScript代码:
Multiple data tables are been assigned exactly the same widgetVar name in JavaScript scope. In effects, the following JavaScript code is generated:
window['chatTableWV'] = new Widget(tableElement1);
window['chatTableWV'] = new Widget(tableElement2);
window['chatTableWV'] = new Widget(tableElement3);
// ...
基本上，每次迭代都会覆盖分配给声明的widgetVar名称的最后一个对象，直到最终引用最后一个.所有期望最后一个的小部件基本上都不可用，从而导致它们在行选择方面不再起作用.
Basically, every iteration overrides the last object assigned to the declared widgetVar name until it ends up referencing the last one. All widgets expect of the last one are basically unavailable, causing them to not be functional anymore as to row selection.
为它们分别指定一个唯一的widgetVar来修复此问题.您可以为此使用<ui:repeat>的迭代索引.
Fix it accordingly by giving them each an unique widgetVar. You could use the iteration index of <ui:repeat> for this.
<ui:repeat ... varStatus="loop">
<p:dataTable ... widgetVar="chatTableWV_#{loop.index}">
<p:ajax ... oncomplete="chatTableWV_#{loop.index}.unselectAllRows();">
这样，将生成以下JavaScript代码:
This way the following JavaScript code is generated:
window['chatTableWV_0'] = new Widget(tableElement1);
window['chatTableWV_1'] = new Widget(tableElement2);
window['chatTableWV_2'] = new Widget(tableElement3);
// ...
最后，PrimeFaces窗口小部件管理器可以全部找到它们.
And finally PrimeFaces widget manager can find them all.
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