I think you're code to set the id is running before there is any DOM peer
yet. When I've needed to access a widget's element, I've usually done it
in an attach handler, or in a method that I know won't get invoked until
the widget has been attached to the DOM.
On Wednesday, October 9, 2013 10:12:46 AM UTC-4, Steen Lillethorup
Frederiksen wrote:
>
> I am trying to create a generic Composite widget, using Java Generics.
> However I keep getting the assertion error:
>
> java.lang.AssertionError: This UIObject's element is not set; you may be
> missing a call to either Composite.initWidget() or UIObject.setElement()
>
>
> I have defined my Composite widget as follows:
>
> public class DataEntry<DataType extends FocusWidget> extends Composite {
>
> final protected FlowPanel panel;
> final protected InlineLabel promptLabel;
> final protected DataType inputElement;
>
> public DataEntry(final DataType inputField, final String guiId, final
> String prompt) {
> super();
>
> promptLabel = new InlineLabel(prompt);
> inputElement = inputField;
>
> panel = new FlowPanel();
> panel.add(promptLabel);
> panel.add(inputField);
> initWidget(panel);
>
> getElement().setId(guiId);
> promptLabel.setStylePrimaryName("dio-DataEntry-Prompt");
> inputElement.setStylePrimaryName("dio-DataEntry-Input");
> }
>
> And I am defining my concrete Composite widgets as follows (could be
> TextBox, TextArea etc.):
>
> public class ListEntry extends DataEntry<ListBox> {
> public ListEntry(String guiId, String prompt) {
> super(new ListBox(), guiId, prompt);
> }
> ...
> }
>
> Can anyone explain to me, what I have missed here?
>
> Thanx
> Steen
>
>
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