Usage#

The primary use, for this module, is as a custom input field interface. For instance, imagine you had the following data objects:

php

namespace App\Models;

use SilverStripe\Blog\Model\BlogTag;
use SilverStripe\ORM\DataObject;

class BlogPost extends DataObject
{
    private static $many_many = [
        'BlogTags' => BlogTag::class,
    ];
}

php

namespace App\Models;

use SilverStripe\Blog\Model\BlogPost;
use SilverStripe\ORM\DataObject;

class BlogTag extends DataObject
{
    private static $db = [
        'Title' => 'Varchar(200)',
    ];

    private static $belongs_many_many = [
        'BlogPosts' => BlogPost::class,
    ];
}

If you wanted to link blog tags to blog posts, you might override DataObject::getCMSFields() with the following field:

php

use SilverStripe\Blog\Model\BlogTag;
use SilverStripe\TagField\TagField;

$field = TagField::create(
    'BlogTags',
    'Blog Tags',
    BlogTag::get(),
    $this->BlogTags()
)
    // tags should be lazy loaded
    ->setShouldLazyLoad(true)
    // new tag DataObjects can be created
    ->setCanCreate(true);

This will present a tag field, in which you can select existing blog tags or create new ones. They will be created/linked after the blog posts are saved.

StringTagField#

You can also store string-based tags, with the following field type:

php

use SilverStripe\TagField\StringTagField;

$field = StringTagField::create(
    'Tags',
    'Tags',
    ['one', 'two'],
    explode(',', $this->Tags)
)
    ->setCanCreate(true)
    ->setShouldLazyLoad(true);

This assumes you are storing tags in the following data object structure:

php

namespace App\Models;

use SilverStripe\ORM\DataObject;

class BlogPost extends DataObject
{
    private static $db = [
        'Tags' => 'Text',
    ];
}

In the above code example, the options available (whether lazy loaded or not) would be "one" and "two", and the user would be able to create new options. Whichever tags are chosen would be stored in the BlogPost's Tags field as a comma-delimited string.

Using tagfield with silverstripe-taxonomy#

TagField assumes that objects have a Title field. For classes without a Title field use TagField::setTitleField() to modify accordingly.

php

use SilverStripe\TagField\TagField;
use SilverStripe\Taxonomy\TaxonomyTerm;

$field = TagField::create(
    'Tags',
    'Blog Tags',
    TaxonomyTerm::get()
)
    ->setTitleField('Name');