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    #1

    Bug after filtering on onCellHover

    I think there is a bug when combining filtering on a listgrid and an onCellHover.

    The minimal code (a showcase example):

    Code:
    package zedes2.client;

import com.google.gwt.core.client.EntryPoint;
import com.smartgwt.client.data.DataSource;
import com.smartgwt.client.data.DataSourceField;
import com.smartgwt.client.data.fields.DataSourceBooleanField;
import com.smartgwt.client.data.fields.DataSourceDateField;
import com.smartgwt.client.data.fields.DataSourceFloatField;
import com.smartgwt.client.data.fields.DataSourceIntegerField;
import com.smartgwt.client.data.fields.DataSourceTextField;
import com.smartgwt.client.types.FieldType;
import com.smartgwt.client.widgets.grid.ListGrid;
import com.smartgwt.client.widgets.grid.ListGridRecord;
import com.smartgwt.client.widgets.grid.events.CellHoverEvent;
import com.smartgwt.client.widgets.grid.events.CellHoverHandler;

public class Alternate
    implements EntryPoint, CellHoverHandler
{

    public void onModuleLoad()
    {

        final ListGrid countryGrid = new ListGrid();
        countryGrid.setWidth( 500 );
        countryGrid.setHeight( 224 );
        countryGrid.setShowAllRecords( false );
        countryGrid.setDataSource( WorldDS.getInstance() );
        countryGrid.setAutoFetchData( true );

        countryGrid.setCanEdit( true );
        countryGrid.setCanEdit( false );
        countryGrid.setShowFilterEditor( true );
        countryGrid.setFilterOnKeypress( true );

        countryGrid.setCanHover( true );

        // TODO: evtl nicht hier?? hier ist ja nur ein ListGrid
        countryGrid.addCellHoverHandler( this );

        countryGrid.setHoverWidth( 50 );
        countryGrid.setFetchDelay( 500 );
        countryGrid.setDataPageSize( 20 );
        countryGrid.draw();
    }

    private static class WorldDS
        extends DataSource
    {
        // The DataSource would normally be defined external to any classes that use it.

        private static WorldDS instance = null;

        public static WorldDS getInstance()
        {
            if ( instance == null )
            {
                instance = new WorldDS( "worldDS" );
            }
            return instance;
        }

        public WorldDS( String id )
        {
            setID(id);  
            setRecordXPath("/List/country");  
            DataSourceIntegerField pkField = new DataSourceIntegerField("pk");  
            pkField.setHidden(true);  
            pkField.setPrimaryKey(true);  
      
            DataSourceTextField countryCodeField = new DataSourceTextField("countryCode", "Code");  
            countryCodeField.setRequired(true);  
      
            DataSourceTextField countryNameField = new DataSourceTextField("countryName", "Country");  
            countryNameField.setRequired(true);  
      
            DataSourceTextField capitalField = new DataSourceTextField("capital", "Capital");  
            DataSourceTextField governmentField = new DataSourceTextField("government", "Government", 500);  
      
            DataSourceBooleanField memberG8Field = new DataSourceBooleanField("member_g8", "G8");  
      
            DataSourceTextField continentField = new DataSourceTextField("continent", "Continent");  
            continentField.setValueMap("Europe", "Asia", "North America", "Australia/Oceania", "South America", "Africa");  
      
            DataSourceDateField independenceField = new DataSourceDateField("independence", "Nationhood");  
            DataSourceFloatField areaField = new DataSourceFloatField("area", "Area (kmē)");  
            DataSourceIntegerField populationField = new DataSourceIntegerField("population", "Population");  
            DataSourceFloatField gdpField = new DataSourceFloatField("gdp", "GDP ($M)");  
              
            setFields(pkField, countryCodeField, countryNameField, capitalField, governmentField,  
                    memberG8Field, continentField, independenceField, areaField, populationField,  
                    gdpField);  
      
            setDataURL("ds/world.data.xml");  
            setClientOnly(true);  
            
        }

    }

    @Override
    public void onCellHover( CellHoverEvent event )
    {
        ListGridRecord lg = event.getRecord();
        System.out.println( lg.getAttribute( "countryName" ) );
    }

}
    If I change the continent filter (the selectItem) and QUICKLY move to a record, so that onCellHover is called before the filtering actually occurs, I get this exception:

    Code:
    Uncaught JavaScript exception [TypeError: _1 is null] in http://127.0.0.1:8888/zedes2/sc/modules/ISC_Core.js, line 3366


com.google.gwt.event.shared.UmbrellaException: One or more exceptions caught, see full set in UmbrellaException#getCauses
    at com.google.gwt.event.shared.HandlerManager.fireEvent(HandlerManager.java:129)
    at com.smartgwt.client.widgets.BaseWidget.fireEvent(BaseWidget.java:71)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103)
    at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71)
    at com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:172)
    at com.google.gwt.dev.shell.BrowserChannelServer.reactToMessagesWhileWaitingForReturn(BrowserChannelServer.java:337)
    at com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:218)
    at com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:136)
    at com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:561)
    at com.google.gwt.dev.shell.ModuleSpace.invokeNativeObject(ModuleSpace.java:269)
    at com.google.gwt.dev.shell.JavaScriptHost.invokeNativeObject(JavaScriptHost.java:91)
    at com.google.gwt.core.client.impl.Impl.apply(Impl.java)
    at com.google.gwt.core.client.impl.Impl.entry0(Impl.java:213)
    at sun.reflect.GeneratedMethodAccessor32.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103)
    at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71)
    at com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:172)
    at com.google.gwt.dev.shell.BrowserChannelServer.reactToMessages(BrowserChannelServer.java:292)
    at com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:546)
    at com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:363)
    at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.ClassCastException: com.smartgwt.client.data.Record cannot be cast to com.smartgwt.client.widgets.grid.ListGridRecord
    at com.smartgwt.client.widgets.grid.events.GridRowColEvent.getRecord(GridRowColEvent.java)
    at zedes2.client.Alternate.onCellHover(Alternate.java:104)
    at com.smartgwt.client.widgets.grid.events.CellHoverEvent.dispatch(CellHoverEvent.java:100)
    at com.smartgwt.client.widgets.grid.events.CellHoverEvent.dispatch(CellHoverEvent.java:1)
    at com.google.gwt.event.shared.GwtEvent.dispatch(GwtEvent.java:1)
    at com.google.web.bindery.event.shared.EventBus.dispatchEvent(EventBus.java:40)
    at com.google.web.bindery.event.shared.SimpleEventBus.doFire(SimpleEventBus.java:193)
    at com.google.web.bindery.event.shared.SimpleEventBus.fireEvent(SimpleEventBus.java:88)
    at com.google.gwt.event.shared.HandlerManager.fireEvent(HandlerManager.java:127)
    at com.smartgwt.client.widgets.BaseWidget.fireEvent(BaseWidget.java:71)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103)
    at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71)
    at com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:172)
    at com.google.gwt.dev.shell.BrowserChannelServer.reactToMessagesWhileWaitingForReturn(BrowserChannelServer.java:337)
    at com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:218)
    at com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:136)
    at com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:561)
    at com.google.gwt.dev.shell.ModuleSpace.invokeNativeObject(ModuleSpace.java:269)
    at com.google.gwt.dev.shell.JavaScriptHost.invokeNativeObject(JavaScriptHost.java:91)
    at com.google.gwt.core.client.impl.Impl.apply(Impl.java)
    at com.google.gwt.core.client.impl.Impl.entry0(Impl.java:213)
    at sun.reflect.GeneratedMethodAccessor32.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103)
    at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71)
    at com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:172)
    at com.google.gwt.dev.shell.BrowserChannelServer.reactToMessages(BrowserChannelServer.java:292)
    at com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:546)
    at com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:363)
    at java.lang.Thread.run(Unknown Source)
    Code:
    18:30:58.324 [ERROR] [zedes2] 18:30:58.256:IFCS4:WARN:Log:TypeError: _1 is null
Stack from error.stack:
    unnamed(isc_Canvas__getHoverPropertie) @ zedes2/sc/modules/ISC_Core.js:3366
    unnamed(isc_GridRenderer__showHove) @ zedes2/sc/modules/ISC_Grids.js:830
    unnamed(isc_GridRenderer__cellHove) @ zedes2/sc/modules/ISC_Grids.js:829
    unnamed(isc_c_Hover__doActio) @ zedes2/sc/modules/ISC_Core.js:4309
    unnamed(isc_c_Class_fireCallbac) @ zedes2/sc/modules/ISC_Core.js:339
    unnamed(isc_c_Timer__fireTimeou) @ zedes2/sc/modules/ISC_Core.js:1440
    unnamed() @ zedes2/sc/modules/ISC_Core.js:1435
    unnamed() @ 
com.smartgwt.client.core.JsObject$SGWT_WARN: 18:30:58.256:IFCS4:WARN:Log:TypeError: _1 is null
Stack from error.stack:
    unnamed(isc_Canvas__getHoverPropertie) @ zedes2/sc/modules/ISC_Core.js:3366
    unnamed(isc_GridRenderer__showHove) @ zedes2/sc/modules/ISC_Grids.js:830
    unnamed(isc_GridRenderer__cellHove) @ zedes2/sc/modules/ISC_Grids.js:829
    unnamed(isc_c_Hover__doActio) @ zedes2/sc/modules/ISC_Core.js:4309
    unnamed(isc_c_Class_fireCallbac) @ zedes2/sc/modules/ISC_Core.js:339
    unnamed(isc_c_Timer__fireTimeou) @ zedes2/sc/modules/ISC_Core.js:1440
    unnamed() @ zedes2/sc/modules/ISC_Core.js:1435
    unnamed() @ 
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
    at java.lang.reflect.Constructor.newInstance(Unknown Source)
    at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:105)
    at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71)
    at com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:172)
    at com.google.gwt.dev.shell.BrowserChannelServer.reactToMessages(BrowserChannelServer.java:292)
    at com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:546)
    at com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:363)
    at java.lang.Thread.run(Unknown Source)
    The error occurs on event.getRecord(), so I think it is already null (because of the filter change) but it stills try to evaluate.
    That's why this occurs:
    java.lang.ClassCastException: com.smartgwt.client.data.Record cannot be cast to com.smartgwt.client.widgets.grid.ListGridRecord
    at com.smartgwt.client.widgets.grid.events.GridRowColEvent.getRecord(GridRowColEvent.java)
    at zedes2.client.Alternate.onCellHover(Alternate.java:104)

    (on the stack)

    Using SNAPSHOT_v8.3d_2012-07-30/EVAL Deployment, but I also observerd this on 3.0p EE.
    Tags: None
    #2
    Someone ? I posted a minimal example from the showcase as required.
    Is this a bug / is there a workaround?

    Comment

      #3
      Doesn't seem to be important

      Comment

        #4
        Can someone please tell me why I don't get ANY reaction to my post?
        Isomorphic?

        Comment

          #5
          You can resolve this issue by adding a null-check to your cell-hover method:

          Code:
              @Override
    public void onCellHover( CellHoverEvent event )
    {
        ListGridRecord lg = event.getRecord();
        if (lg == null) {
            System.out.println(" *** NULL ***");
            return;
        }
        System.out.println( lg.getAttribute( "countryName" ) );
    }

          We are making a change to the framework to avoid the cellHover handler from firing at all with a null record. This will be present in nightly builds going forward in the 3.1d branch

          Regards
          Isomorphic Software

          Comment

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