New in Symfony 3.4 Form improvements

New HTML5 types

Contributed by Arnaud Petitpas in #22679

The HTML5 specification defines several form fields that are still not supported by Symfony Forms. In Symfony 3.4 we implemented two of these new HTML5 form fields which have a good support in modern browsers: TelType (for telephone numbers) and ColorType (for color pickers).

New options for TimezoneType

Contributed by Roland Franssen in #23648

The TimezoneType defines two new options: input and regions. The input option defines the format that the timezone is stored in your underlying object. The value can be string (e.g. America/New_York) and datetimezone (which returns a DateTimeZone object).

The regions option filters the timezones to only display the ones that belong to the given region or regions. For example, to display just the timezones of Europe and America: DateTimeZone::AMERICA | DateTimeZone::EUROPE .

Callbacks in the delete_empty option

Contributed by Konstantin Myakshin in #20496

In addition to boolean values, the delete_empty now accepts PHP callbacks to decide if items should be deleted. In case of compound entries, you can now do this:

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'delete_empty' => function (Author $author = null) {
    return null === $author || empty($author->firstName);
},

In case of compound entries without data_class:

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'delete_empty' => function ($author) {
    return empty($author['firstName']);
},