XForm validation

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Is it possible to <xform:bind> an element to validate its content
against an external database/URL?
For example, in a user registration form, I would like to make sure
the account name does not already exists in the user DB.
Can I do this without having to submit the form?
thanks
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Hi Pascal,

In this case you would have to communicate with the server to check if
the user name exists already. But you can do this in the background,
that is: without reloading a page, with an <xforms:submission
replace="instance"> that is triggered when the end-user clicks on a
button "check if user name is available", or just when he tabs out of
the "user name" text field.

We don't have an example that does exactly this, but you can look at
the Instant Translation example where a submission happens on the
background and information is displayed in the page based on the
result of that submission.

Alex

On 3/8/06, Pascal Heus <[hidden email]> wrote:
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