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**jornn** · 2 Jan 2013, 15:38

I also get this message when trying to tab into a ListGrid field where the grid field I'm tabbing into is backed by an EditorType implemented by a class extending CanvasItem.

What happens is that the user presses tab - and the list grid looses the editable state.

When debugging in eclipse, I see this exception:

[ERROR] [cloudview] - 15:33:25.169:IFCS8:WARN:Log:TypeError: this.form is null
Stack from error.stack:
CanvasItem.canvasFocusChanged() @ /sc/modules/ISC_Forms.js:1196
...
unnamed() @

I am testing with the following MyItem class:

Code:

public class MyItem extends CanvasItem
{
  public MyItem(String name)
  {
    setName(name);
    final DynamicForm f = new DynamicForm();
    TextItem s = new TextItem("theNewItem");
    s.addChangedHandler(new ChangedHandler()
    {
      @Override
      public void onChanged(ChangedEvent event)
      {
        setValue(event.getValue().toString());
      }
    });
    f.setItems(s);
    setCanvas(f);
  }

  @Override
  public void setValue(String value)
  {
    super.setValue(value);
  }

  @Override
  public Object getValue()
  {
    return super.getValue();
  }
};

Any ideas?

**Isomorphic** · 3 Jan 2013, 03:53

Adding a ChangeHandler that calls setValue woth the current value doesn't make much sense - at best it's a no-op. It wouldn't cause this issue however - try creating a runnable test case that reproduces the issue, and don't forget all the version information the forums asks for.

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CanvasItem, Uncaught exception escaped

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