Ajax listener executed twice with primefaces

0
votes

I would like to have two ajax listeners for a p:droppable component.

That works but my listeners are called twice each.

<ui:repeat id="orderGroups" value="#{omsOrderActionBean.order.orderGroups}" var="group">
  <p:panel > 
   <p:fieldset id="selectedLineItems" style="margin-top:20px">
    <p:dataTable>
         ...
    </p:dataTable>
   </p:fieldset>
 </p:panel>
 <p:droppable for=":frmItem:tabViewSections:orderGroups:selectedLineItems"
  tolerance="touch" activeStyleClass="ui-state-highlight" datasource=":frmItem:tabViewSections:availableItems" onDrop="handleDrop">
    <p:ajax listener="#{omsOrderActionBean.setSelectedOrderGroup(group)}" immediate="true" />
    <p:ajax listener="#{omsOrderActionBean.onArticleDrop}" update=":frmItem:tabViewSections:outpOrderGroups :frmItem:tabViewSections:availableItems" />
 </p:droppable>
</ui:repeat>

Do you know how to avoid that behaviour? Or how to pass an argument to and ajax event?

2
jsfprimefaces

2 Answers

0
votes

I highly encourage you not to have two ajax listeners for the same event. That increases client/server traffic, performing multiple ajax requests which make your system slow down. Instead, perform only one of them and execute your whole logic there.

<p:ajax listener="#{omsOrderActionBean.onDrop}" 
    update=":frmItem:tabViewSections:outpOrderGroups :frmItem:tabViewSections:availableItems" />

In order to get the dropped object you should follow the signature specified in the showcase:

public void onDrop(DragDropEvent event) {  
    Group group = (Group) event.getData();  
}
0
votes

I found a solution to my own problem. I use only one ajax listener. In this listener i get the dropId containing the position of my group. I then simply transform it to an integer and get it from my list of orders:

// DropId is of the form: orderGroups:0:selectedLineItems
String[] dropSplit = ddEvent.getDropId().split(":");
// Get the second part to retrieve the correct orderGroup:
int orderGroupPosition = Integer.parseInt(dropSplit[2]);
orderGroups.get(orderGroupPosition);