Override node title validation

Question

I have a pretty specific case where I want to fill in the node title myself if the user fills a checkbox above the title field.

For this reason, I can't use autonodetitle (because the title is only automatic if the checkbox is selected).

I have added my own validation callback using array_unshift() in a hook_form_alter to make sure its the first one but when its called the form already has an error (title field is required)

Is there any way I hook into the validation process earlier or even just remove the error for this field?

Thanks!

where did you add the array_unshift(), in a hook_form_alter()? Also, feel free to share what is the error. — amateur barista
– amateur barista, Commented Jan 25, 2012 at 16:26
yeah in a hook_form_alter(), the error is that title field can't be empty. — Alex Weber
– Alex Weber, Commented Jan 25, 2012 at 17:32

amateur barista · Accepted Answer · 2012-01-26 17:11:11Z

You can easily hook into the validation process by implementing hook_form_alter(&$form, &$form_state, $form_id) or it's cousin hook_form_FORM_ID_alter(). There you can inspect the $form variable, find out where the array of validation functions is, and perform array_unshift() on it.

You could also use the form alter hooks to modify the #required property of your title field, therefore preventing further validation errors down the line.

Don't forget that in order for your array_unshift() operation to be successful, the form needs to be passed by reference to your hook, or else you would only be modifying a local copy of the form variable. It's very easy to forget adding the ampersand & in front of $form in the hook implementation. i.e. ...& $form...

If you put error_log(__FUNCTION__) in each of the functions mentioned in the validator array, what do you get? Is your validator truly the first? If it is, then your problem is beyond hook_form_alter() and it might lie in some core code. If it not the first, then you might be missing a step from my solution. — amateur barista
– amateur barista, Commented Jan 25, 2012 at 17:51
If you can confirm 100% that your validator is the first, and by the time you break into your validator you have an error in the form, then most likely form_error() is being called outside a validator (read: no-no, naughty code). If this is indeed the case, then just break into form_error() and see who's calling it. — amateur barista
– amateur barista, Commented Jan 25, 2012 at 17:58
Also, have you checked out hook_form_BASE_FORM_ID_alter? I've never used it, but could it be that the form you are targeting has a base form, which also specifies a "base form validator"? — amateur barista
– amateur barista, Commented Jan 25, 2012 at 18:03

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