Re: Basic purpose of onEnsureDebugId

On 16 July 2010 02:14, Thomas Broyer <t.broyer@gmail.com> wrote:
> On 16 juil, 06:26, Aditya <007aditya.b...@gmail.com> wrote:
>> Can anyone has answer why is onEnsureDebugId() is used...?
>> how does it helps while creating custom widgets.
>
> The whole notion of "debug ID" is only useful if you do run selenium
> or webdriver (or similar) tests, and you therefore need widgets to
> have an ID, and moreover a *stable* ID. But you generally don't want
> that ID to be generated when deploying for production use.
> So you'll call ensureDebugId in your code, which in turn will call the
> onEnsureDebugId of the widget, but only if you <inherit
> name='com.google.gwt.user.Debug' />, otherwise it's a no-op.
> Widgets can then override onEnsureDebugId to set an ID not only to
> their "root element" but also to child elements. See for instance how
> CheckBox overrides onEnsureDebugId to set an ID on the checkbox and
> label (remember, CheckBox is a <span> with a <input type=checkbox> and
> <label> children).
> Calling ensureDebugId("foo") on some CheckBox widget will set an
> id="gwt-debug-foo" on the <span>, id="gwt-debug-foo-label" on the
> <label> and id="gwt-debug-foo-input" on the <input type=checkbox>.
> That way you can write selenium/webdriver/whatever tests that will
> generate, say, click events on the document.getElementById("gwt-debug-
> foo-input") (i.e. the <input type=checkbox> of your CheckBox widget)

I just found out about ensureDebugId precisely because I want to use
Selenium to test our GWT app. I don't clearly understand why this is a
debug only thing. What is the reason you don't want this in
production? Is it simply because all those ids take up a lot of space?

The consequence of only having a debug id is that I need to have two
versions of the app, a production version and a test version. I can do
that but I'd like to be clear on why the extra effort is worth it. :-)

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