Hi,

Getting this error when trying to use Listbox field with multiple selections.
[User Error] Uncaught InvalidArgumentException: No array values allowed with multiple=false

Tried using setMultiple(True) which doesn't seem to work. Hacking ListboxField.php and changing protected $multiple = false; to protected $multiple = true; fixes the issues but isn't a great solution.

This is my code:
$thelistboxfield = new ListBoxField("VehicleOptionalExtras", "Optional Extras", $this->getVehicleOptionalExtras(),unserialize(Session::get('Session_VehicleOptionalExtras')));
$thelistboxfield->setSize(10);
$thelistboxfield->setMultiple(true);

What am I missing?

Thanks
Regards
Scott

Hi there, is this for use in the CMS or the frontend for users?

For the frontend thanks.

Hi Scott,

Try changing your code to the following (note the extra two arguments):

$thelistboxfield = new ListBoxField("VehicleOptionalExtras", "Optional Extras", $this->getVehicleOptionalExtras(), unserialize(Session::get('Session_VehicleOptionalExtras')), 10, true);

Loz

Thanks for your reply. Tried that, but still the same error. Also that was how it use to work on silverstripe 2.7x.

On the VehicleOptionalExtras select form field, it does appear that it is setting multiple=true correctly. Seems the setMultiple function is not updating $multiple variable to true in ListboxForm.php

Thanks
Regards
Scott

You're trying to set the value before you set multiple to true. Try:

ListboxField::create('Name','Title')
->setMultiple(true)
->setSource($someOptions)
->setValue($someValues);

That worked, thanks for pointing that out. :-)