Primefaces:如何持久保存来自p:orderList的重新排序的数据? [英] Primefaces: How to persist reordered data from a p:orderList?

问题描述

我仍在使用primefaces组件p:orderlist. 我已经实现了拖放行为(将另一个列表中的项目放入p:orderlist)，并且使p:commandButton在p:orderlist中起作用.

I am still working on with the primefaces component p:orderlist. I have managed to implement a drag and drop behaviour (to put items from another list in to the p:orderlist) and I also make the p:commandButton work inside the p:orderlist.

现在我有一个新问题.您可以将项目拖放到p:order列表中，以为其赋予新的顺序. (也就是说，为什么将该组件称为订单清单，与购物订单无关；-)).

Now I have a new problem. You can drag and drop items inside the p:order list, to give them a new order. (That is, why the component is called orderlist, nothing to do with a shopping order ;-) ).

但是，如果我重新订购商品，则不会收到通知或事件，告诉我的bean，某些东西已更改.

But if I reorder my items I get no notification or event, which tells my bean, that something was changed.

有人知道如何做到这一点吗?

Has anybody an idea how to make this possible?

这是我的p:orderlist，看起来像这样:

Here is my p:orderlist, like it looks know:

 <h:panelGroup>

           <p:remoteCommand name="removeTechniker" actionListener="#{systemlandschaftRessourceHandler.removeTechnikerByRemoteCommand}"
                     out="technikersTable" update="@form"/>

           <p:orderList id="technikersTable"
                        value="#{systemlandschaftRessourceHandler.entity.technikers}" 
                        var="_techniker"  
                        itemValue="#{_techniker}" 
                        converter="#{entityConverter}"
                        controlsLocation="none">  

                <f:facet name="caption">Techniker</f:facet>  

                <p:column>    
                    <p:commandButton id="deleteTechnikerFromListButton" 
                                    styleClass="colButton" 
                                    icon="ui-icon-trash" 
                                    type="button" 
                                    onclick="removeTechniker([{name:'id', value:'#{_techniker.id}'}]);"
                                    update="@form"/>
                </p:column>
                <p:column style="width:75%;" id="outTech">  
                   <p:outputLabel value="#{_techniker.verantwortlich.displayName}"/>
                </p:column>

            </p:orderList>

            <p:droppable id="technikerDrop" 
                        for="technikersTable" 
                        tolerance="touch" 
                        activeStyleClass="ui-state-highlight" 
                        datasource=":systemLandschaftTabView:sysObjektDetailPanelForm:userTable" 
                        scope="userDraggable">  
                    <p:ajax listener="#{systemlandschaftRessourceHandler.onDropTechniker}" update="@form" />  
            </p:droppable>  
            </h:panelGroup>

我已经在primefaces社区中找到了一些东西，但这是行不通的，甚至不能说出原因. 链接: http://forum.primefaces.org/viewtopic.php? f = 3& t = 26539

I already found something on the primefaces community, but this doesn't work, can' even say why. Link: http://forum.primefaces.org/viewtopic.php?f=3&t=26539

问候 LStrike

Regards LStrike

仅供参考，以下是我解决的有关p:orderlist的项目:

Just for info, here are my solved items, regarding the p:orderlist:

界面:Orderlist中的CommandButton不起作用

和

底图:Orderlist:重新排序时索引超出限制的异常

推荐答案

我自己想出了一个解决方案. 这是某种黑客手段，但确实有效. 我使用列表的设置器，我想对其进行排序并将其发送到数据库.为了读取列表，我在吸气剂上使用@OrderBy批注.

Figured out a solution myself. It's some kind of hack, but it works. I use the setter of the list, I want to have sorted and send it to the database. For reading the list I use the @OrderBy annotation on the getter.

@OrderBy("ranking ASC")
    @ManyToMany(fetch = FetchType.LAZY)
    @JoinTable(name="MWEB_SYSLAND_RES_ENTWUSER_L", joinColumns = {@JoinColumn(name = "ID_SYSLAND_RES", nullable = false, updatable = false)} ,inverseJoinColumns = { @JoinColumn(name ="ID_SYSLAND_USER", nullable = false, updatable = false) })
    public List<SystemlandschaftUser> getEntwicklers() {
        return entwicklers;
    }

    public void setEntwicklers(List<SystemlandschaftUser> entwicklers) {
        this.entwicklers = sortSysUserList(entwicklers);

@Transient
    private List<SystemlandschaftUser> sortSysUserList(List<SystemlandschaftUser> input){
        if(input != null && input.size() > 0){
            for(int i=1, size=input.size(); i <= size; i++){
                SystemlandschaftUser t = input.get(i-1);
                t.setRanking(i);
            }
        }
        return input;
    }

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