[FIXED][GXT 2.1.0] ListView fires multiple SelectionChangedEvents

[mbaumbach]

I'm using GXT 2.1.0 with GWT 2.0 on Mac OS X in both Safari and Firefox (latest versions of each). If I attached a selection changed listener to the ListView's selection model and the ListView's selection model's selection mode is set to MULTI, I receive two events of the same type every time I click. The selection isn't even changing and I still receive two events. Basic example code:

ListView<BaseModel> listView = new ListView<BaseModel>();
listView.getSelectionModel().addSelectionChangedListener(new SelectionChangedListener<BaseModel>() {
     public void selectionChanged(SelectionChangedEvent<BaseModel> se) {
          // Code will be fired twice here on every click
     }
}

I have set the template and item selector appropriately in my code, but left it out, as it doesn't seem to matter.

I tried setting the selection model mode to SINGLE and it worked as expected only receiving one event and only when the selection actually changed.

[mbaumbach]

Just to note, the events appear to be on mouse down and then mouse up. If you place a println statement in the event handler and click down, you'll see the message print to the console. After releasing the mouse, you'll see the second one.

[Arno.Nyhm]

maybe its better if you create a standalone runnig example class which includes the EntryPoint - this avoids side effects from other code and can be debugged more easy by other forum readers.

[darrellmeyer]

This bug is fixed in the releases/2.1 branch and is now available in the 2.1.1-beta release available here.

[thejoker101]

Not sure if it's still this bug, but I see duplicate SelectionChanged events for the combobox with 2.2.4.

If I do a stack trace in my listener, I get two that look like:

    at Unknown.com_extjs_gxt_ui_client_event_SelectionChangedListener_$handleEvent__Lcom_extjs_gxt_ui_client_event_SelectionChangedListener_2Lcom_extjs_gxt_ui_client_event_SelectionChangedEvent_2V(SelectionChangedListener.java:30)
    at Unknown.com_extjs_gxt_ui_client_event_SelectionChangedListener_handleEvent__Lcom_extjs_gxt_ui_client_event_BaseEvent_2V(SelectionChangedListener.java:29)
    at Unknown.com_extjs_gxt_ui_client_event_BaseObservable_$callListener__Lcom_extjs_gxt_ui_client_event_BaseObservable_2Lcom_extjs_gxt_ui_client_event_Listener_2Lcom_extjs_gxt_ui_client_event_BaseEvent_2V(BaseObservable.java:178)
    at Unknown.com_extjs_gxt_ui_client_event_BaseObservable_$fireEvent__Lcom_extjs_gxt_ui_client_event_BaseObservable_2Lcom_extjs_gxt_ui_client_event_EventType_2Lcom_extjs_gxt_ui_client_event_BaseEvent_2Z(BaseObservable.java:86)
    at Unknown.com_extjs_gxt_ui_client_event_BaseObservable_fireEvent__Lcom_extjs_gxt_ui_client_event_EventType_2Lcom_extjs_gxt_ui_client_event_BaseEvent_2Z(BaseObservable.java:77)
    at Unknown.com_extjs_gxt_ui_client_widget_Component_$fireEvent__Lcom_extjs_gxt_ui_client_widget_Component_2Lcom_extjs_gxt_ui_client_event_EventType_2Lcom_extjs_gxt_ui_client_event_BaseEvent_2Z(Component.java:444)
    at Unknown.com_extjs_gxt_ui_client_widget_form_ComboBox_$setValue__Lcom_extjs_gxt_ui_client_widget_form_ComboBox_2Lcom_extjs_gxt_ui_client_data_ModelData_2V(ComboBox.java:967)
    at Unknown.com_extjs_gxt_ui_client_widget_form_ComboBox_setValue__Lcom_extjs_gxt_ui_client_data_ModelData_2V(ComboBox.java:960)
    at Unknown.com_extjs_gxt_ui_client_widget_form_ComboBox_$onSelect__Lcom_extjs_gxt_ui_client_widget_form_ComboBox_2Lcom_extjs_gxt_ui_client_data_ModelData_2IV(ComboBox.java:1366)
    at Unknown.com_extjs_gxt_ui_client_widget_form_ComboBox_$onViewClick__Lcom_extjs_gxt_ui_client_widget_form_ComboBox_2Lcom_extjs_gxt_ui_client_event_DomEvent_2ZV(ComboBox.java:1425)
    at Unknown.com_extjs_gxt_ui_client_widget_form_ComboBox$6_$handleEvent__Lcom_extjs_gxt_ui_client_widget_form_ComboBox$6_2Lcom_extjs_gxt_ui_client_event_ListViewEvent_2V(ComboBox.java:1193)
    at Unknown.com_extjs_gxt_ui_client_widget_form_ComboBox$6_handleEvent__Lcom_extjs_gxt_ui_client_event_BaseEvent_2V(ComboBox.java:1192)
    at Unknown.com_extjs_gxt_ui_client_event_BaseObservable_$callListener__Lcom_extjs_gxt_ui_client_event_BaseObservable_2Lcom_extjs_gxt_ui_client_event_Listener_2Lcom_extjs_gxt_ui_client_event_BaseEvent_2V(BaseObservable.java:178)
    at Unknown.com_extjs_gxt_ui_client_event_BaseObservable_$fireEvent__Lcom_extjs_gxt_ui_client_event_BaseObservable_2Lcom_extjs_gxt_ui_client_event_EventType_2Lcom_extjs_gxt_ui_client_event_BaseEvent_2Z(BaseObservable.java:86)
    at Unknown.com_extjs_gxt_ui_client_event_BaseObservable_fireEvent__Lcom_extjs_gxt_ui_client_event_EventType_2Lcom_extjs_gxt_ui_client_event_BaseEvent_2Z(BaseObservable.java:77)
    at Unknown.com_extjs_gxt_ui_client_widget_Component_$fireEvent__Lcom_extjs_gxt_ui_client_widget_Component_2Lcom_extjs_gxt_ui_client_event_EventType_2Lcom_extjs_gxt_ui_client_event_ComponentEvent_2Z(Component.java:456)
    at Unknown.com_extjs_gxt_ui_client_widget_ListView_$onMouseDown__Lcom_extjs_gxt_ui_client_widget_ListView_2Lcom_extjs_gxt_ui_client_event_ListViewEvent_2V(ListView.java:719)
    at Unknown.com_extjs_gxt_ui_client_widget_ListView_onComponentEvent__Lcom_extjs_gxt_ui_client_event_ComponentEvent_2V(ListView.java:381)
    at Unknown.com_extjs_gxt_ui_client_widget_Component_$onBrowserEvent__Lcom_extjs_gxt_ui_client_widget_Component_2Lcom_google_gwt_user_client_Event_2V(Component.java:884)
    at Unknown.com_extjs_gxt_ui_client_widget_Component_onBrowserEvent__Lcom_google_gwt_user_client_Event_2V(Component.java:823)
    at Unknown.com_google_gwt_user_client_DOM_dispatchEventImpl__Lcom_google_gwt_user_client_Event_2Lcom_google_gwt_user_client_Element_2Lcom_google_gwt_user_client_EventListener_2V(DOM.java:1321)
    at Unknown.com_google_gwt_user_client_DOM_dispatchEvent__Lcom_google_gwt_user_client_Event_2Lcom_google_gwt_user_client_Element_2Lcom_google_gwt_user_client_EventListener_2V(DOM.java:1277)
    at Unknown.anonymous(DOMImplStandard.java:173)
    at Unknown.com_google_gwt_core_client_impl_Impl_apply__Ljava_lang_Object_2Ljava_lang_Object_2Ljava_lang_Object_2Ljava_lang_Object_2(Impl.java:168)
    at Unknown.com_google_gwt_core_client_impl_Impl_entry0__Ljava_lang_Object_2Ljava_lang_Object_2Ljava_lang_Object_2Ljava_lang_Object_2(Impl.java:214)
    at Unknown.anonymous(Impl.java:57)

[sven]

Can you please post a fully working testcase implementing EntryPoint that shows your problem? With this stacktrace i cannot really follow what you want to say.