On 02/01/2010 06:56 PM, Stuart wrote:
> My use case:
>
> I have a TextBox which I want to validate onBlur. If validation fails,
> I want to setFocus on it again. Which makes onBlur fire again, hence
> the validation routine runs again (not ideal, in fact, a defect in my
> mind).
>
> My code:
> == snip ==
> public void onBlur(BlurEvent event) {
> TextBox tb = (TextBox) event.getSource();
> try {
> Long longValue = Long.valueOf(tb.getText());
> } catch (NumberFormatException e) {
> // warn the user in the UI
> // set the focus back on the TextBox
> tb.setFocus(true);
> }
> }
> == end snip ==
>
> The onBlur is running again because FocusWidget does this:
>
> == snip ==
> public void setFocus(boolean focused) {
> if (focused) {
> impl.focus(getElement());
> } else {
> impl.blur(getElement());
> }
> }
> == end snip ==
>
> So, when I insert non-digits in my text box, and tab or click into the
> next form element, onBlur fires once. In my catch block, I set the
> focus again, which triggers onBlur again because of how
> FocusWidget.setFocus is implemented.
>
> This defect prevents me from displaying a message to the user just
> once (ie, with an alert) or setting and clearing a message on fail/
> pass of the validation.
>
> Anyone have a workaround?
>
Set a keydown handler on your numeric-only field(s).
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