silverstripe-tagfield/readme.md

Tag Field

Custom tag input field, for SilverStripe.

Overview

Allows storing tags as a relationship, or comma-delimited strings. Supports autocompletion with lazy-loading.

Note: The field is optimised for usage in the SilverStripe CMS UI. The form field class itself can be used outside of the CMS, but you'll need to build your own frontend to interpret the raw field data (data-schema attribute).

Requirements

• SilverStripe 4.0

Installing

$ composer require silverstripe/tagfield

Using

Relational Tags

use SilverStripe\ORM\DataObject;

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

use SilverStripe\ORM\DataObject;

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

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

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

Note: This assumes you have imported the namespaces class, e.g. use SilverStripe\TagField\TagField;

Has-One Relations

You can also use the TagField to select values for has_one relations. Let's assume, that a BlogPost has one BlogCategory.

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

use SilverStripe\ORM\DataObject;

class BlogPost extends DataObject
{
    private static $has_one = [
        'BlogCategory' => BlogCategory::class
    ];
}

$field = TagField::create(
    'BlogCategoryID',
    $this->fieldLabel('BlogCategory'),
    BlogCategory::get()
)
    ->setIsMultiple(false)
    ->setCanCreate(true);

Note: We're using the ID suffix for the field-name (eg. BlogCategoryID instead of BlogCategory) and only allow one value by setting ->setIsMultiple(false)

String Tags

use SilverStripe\ORM\DataObject;

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

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

$field->setShouldLazyLoad(true); // tags should be lazy loaded

You can find more in-depth documentation in docs/en.

Using TagField with silverstripe-taxonomy

TagField assumes a Title field on objects. For classes without a Title field use setTitleField to modify accordingly.

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

Versioning

This library follows Semver. According to Semver, you will be able to upgrade to any minor or patch version of this library without any breaking changes to the public API. Semver also requires that we clearly define the public API for this library.

All methods, with public visibility, are part of the public API. All other methods are not part of the public API. Where possible, we'll try to keep protected methods backwards-compatible in minor/patch versions, but if you're overriding methods then please test your work before upgrading.

Reporting Issues

Please create an issue for any bugs you've found, or features you're missing.