Configuring links and link fields
Controlling what type of links can be created in a link field
By default, all Link subclasses can be created by a LinkField or MultiLinkField. This includes any custom Link subclasses defined in your project or via a third party module.
If you wish to globally disable one of the default Link subclasses for all link field instances, then this can be done using the following YAML configuration with the fully-qualified class name of the relevant default Link subclass you wish to disable:
SilverStripe\LinkField\Models\SiteTreeLink:
allowed_by_default: falseYou can also apply this configuration to any of your own custom Link subclasses:
namespace App\Model\Link;
use SilverStripe\LinkField\Models\Link;
class MyCustomLink extends Link
{
private static bool $allowed_by_default = false;
// ...
}Developers can control the link types allowed for any individual link field. The AbstractLinkField::setAllowedTypes() method tells the link field which link types that are allowed to be created by it.
Using AbstractLinkField::setAllowedTypes() will override the allowed_by_default configuration.
namespace App\Model;
use SilverStripe\LinkField\Form\LinkField;
use SilverStripe\LinkField\Form\MultiLinkField;
use SilverStripe\LinkField\Models\EmailLink;
use SilverStripe\LinkField\Models\SiteTreeLink;
use SilverStripe\ORM\DataObject;
class MyModel extends DataObject
{
// ...
public function getCMSFields()
{
$fields = parent::getCMSFields();
$fields->addFieldsToTab(
'Root.Main',
[
LinkField::create('EmailLink')->setAllowedTypes([EmailLink::class]),
MultiLinkField::create('LinkList')->setAllowedTypes([SiteTreeLink::class, EmailLink::class]),
]
);
return $fields;
}
}You can also use FieldList::dataFieldByName() if you want to just update the auto-scaffolded form fields.
namespace App\Model;
use SilverStripe\LinkField\Models\EmailLink;
use SilverStripe\LinkField\Models\SiteTreeLink;
use SilverStripe\ORM\DataObject;
class MyModel extends DataObject
{
// ...
public function getCMSFields()
{
$fields = parent::getCMSFields();
$fields->dataFieldByName('EmailLink')->setAllowedTypes([EmailLink::class]);
$fields->dataFieldByName('LinkList')->setAllowedTypes([SiteTreeLink::class, EmailLink::class]);
return $fields;
}
}Excluding the LinkText field
Sometimes you might want to have a link which doesn't have text, or for which you handle the text elsewhere. For example you might have a banner with a link, and you only want to use a Link record to control where the banner links to.
You can call the AbstractLinkField::setExcludeLinkTextField() method to remove the LinkText field from the link modal for all links connected to that link field.
namespace App\Model;
use SilverStripe\LinkField\Form\LinkField;
use SilverStripe\LinkField\Form\MultiLinkField;
use SilverStripe\ORM\DataObject;
class MyModel extends DataObject
{
// ...
public function getCMSFields()
{
$fields = parent::getCMSFields();
$fields->addFieldsToTab(
'Root.Main',
[
LinkField::create('Link')->setExcludeLinkTextField(true),
MultiLinkField::create('LinkList')->setExcludeLinkTextField(true),
]
);
return $fields;
}
}Additional features
You can customise the position of the link type in the menu by setting the the menu_priority configuration property. The priority is in ascending order (i.e. a link with a lower priority value will be displayed higher in the list).
You can also set an icon that will correspond to a specific type of link by setting the value of the icon configuration property. The value of this configuration corresponds to the CSS class of the icon to be used.
You can find the set of available icons in the pattern library.
Make sure you prefix the icon names with font-icon-.
SilverStripe\LinkField\Models\PhoneLink:
menu_priority: 1
icon: 'font-icon-tablet'You can also define these values for a new link type.
namespace App\Model\Link;
use SilverStripe\LinkField\Models\Link;
class MyCustomLink extends Link
{
private static int $menu_priority = 1;
private static $icon = 'font-icon-address-card';
// ...
}