FocusListener

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Version 1.0 onwards

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Alerts You When Your Widget Gets Or Loses Focus

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Sources

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• Button
• ButtonBase
• CheckBox
• CustomButton
• FocusPanel
• FocusWidget
• ListBox
• PasswordTextBox
• PushButton
• RadioButton
• RichTextArea
• SuggestBox
• TextArea
• TextBox
• TextBoxBase
• ToggleButton
• Tree

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Notes

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There are two events: onFocus() and onLostFocus(). Self-explanatory, really.

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Code

If you are new to listeners, then this isn't the simplest of examples, I'd have a look at the Button example under GWT Widgets for that

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class Demo extends Composite implements FocusListener
{
    TextBox textbox = new TextBox();

    public Demo()
    {
        initWidget(textbox);
        textbox.setWidth("100%");
        textbox.setText("Click Here");
        DOM.setStyleAttribute(textbox.getElement(), "textAlign", "center");
        textbox.addFocusListener(this);
    }
    public void onFocus(Widget sender)
    {
        textbox.setText("Got Focus - Click Outside This Box");
    }
    public void onLostFocus(Widget sender)
    {
        textbox.setText("Lost Focus - Click Here Again");
    }
}