我有这种情况,每行数据表都有复选框。如果选中复选框,您可以删除多个数据并仅编辑一个数据。
我成功地实现了删除,但我被编辑卡住了,因为 checkID 将返回 0 的大小。
对于我遵循这个例子的记录
以下是我的代码:
列表.xhtml
<h:form>
<h:commandButton value="Edit" action="#{transportationController.prepareEdit()}"/>
<h:commandButton value="Delete" action="#{transportationController.delete()}">
<p:dataTable value="#{transportationController.items}" var="item" <p:column>
<f:facet name="header">
</f:facet>
<h:selectBooleanCheckbox value="#{transportationTypeController.checkedID[item.id]}"/>
</p:column>
<p:column>
<f:facet name="header">
<h:outputText value="Name"/>
</f:facet>
<h:outputText value="#{item.name}"/>
</p:column>
<p:column>
<f:facet name="header">
<h:outputText value="Remark"/>
</f:facet>
<h:outputText value="#{item.remark}"/>
</p:column>
</p:dataTable>
</h:form>
managedbean ---> transportcontroller.java transportcontroller 是一个 sessionscoped
private Map<Integer, Boolean> checkedID = new HashMap<Integer, Boolean>();
private List<Transportation> transportation = new ArrayList<Transportation>();
//setters and getters.
public List<Transportation> getCheckedTransportation() {
List<Transportation> checkedItems = new ArrayList<Transportation>();
for (Transportation trans : transportation) {
if (checkedID.get(trans.getId())) {
checkedItems.add(trans);
}
}
checkedID.clear();
return checkedItems;
}
//delete function
public String delete() {
List<Transportation> list = getCheckedTransportation();
if (list.size() > 0) {
for (int i = 0; i < list.size(); i++) {
ejbFacade.remove(list.get(i));
}
return "List";
} else {
FacesMessage msg = new FacesMessage("Please select data", "Please select data");
JsfUtil.getCurrent().addMessage("warning-message", msg);
return null;
}
}
//edit function
public void prepareEdit() {
List<Transportation> list = getCheckedTransportation();
if (list.size() == 1) {
current = list.get(0);
} else {
FacesMessage msg = new FacesMessage("Please select at least one data", "Please select at least one data");
JsfUtil.getCurrent().addMessage("warning-message", msg);
}
}
public Transportation getSelected() {
if (current == null) {
current = new Transportation();
selectedItemIndex = -1;
}
return current;
}
实体类--->Transportation.java
public class Transportation implements Serializable{
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Integer id;
//etc..
}
在我调试时,Map checkedID 的大小始终为 0 以进行编辑,但对于删除它工作正常。这几个小时我一直坚持这个问题,但我无法确定问题,因为 checkID 的大小始终为 0,仅当它可以正常删除时才用于编辑。任何帮助,将不胜感激。谢谢。
注意:我知道 primefaces p:datatable 有 selectionMode="multiple" 和 selections 但我不使用它。我只想使用 primefaces 进行分页。