type = ‘slug’¶

Table of contents:

Introduction
Examples
Properties

Introduction ¶

The main purpose of this type is to define parts of a URL path to generate and resolve URLs.

With a URL like https://www.typo3.org/ch/community/values/core-values/ a URL slug is typically a part like /community or /community/values/core-values.

Within TYPO3, a slug is always part of the URL “path” - it does not contain scheme, host, HTTP verb, etc.

A slug is usually added to a TCA-based database table, containing some rules for evaluation and definition. A slug is a segment of a URL, but it is not limited to be separated by slashes. Therefore, a slug can contain slashes.

If a TCA table contains a field called “slug”, it needs to be filled for every existing record. It can be shown and edited via regular Backend Forms, and is also evaluated during persistence via DataHandler.

The default behaviour of a slug is as follows:

A slug only contains characters which are allowed within URLs. Spaces, commas and other special characters are converted to a fallback character.
A slug is always lower-cased.
A slug is unicode-aware.

It is possible to build a default value from the rootline (very helpful for pages, or categorized slugs), but also to just generate a “speaking” segment from e.g. a news title.

Sanitation and Validation configuration options apply when persisting a record via DataHandler.

In the backend forms a validation happens by an AJAX call, which immediately checks any input and receives a new proposal in case the slug is already used.

Examples ¶

'slug' => [
    'label' => '<path-to-locallang-file>.slug',
    'exclude' => 1,
    'config' => [
        'type' => 'slug',
        'generatorOptions' => [
            'fields' => ['title', 'nav_title'],
            'fieldSeparator' => '/',
            'prefixParentPageSlug' => true,
            'replacements' => [
                '/' => '',
            ],
        ],
        'appearance' => [
           'prefix' => \Vendor\Extension\UserFunctions\FormEngine\SlugPrefix::class . '->getPrefix'
        ],
        'fallbackCharacter' => '-',
        'eval' => 'uniqueInSite',
        'default' => ''
    ],
],

appearance ¶

Datatype

array

Scope

Display

Description

Provides a custom base url that is displayed in front of the input field.

prefix

Assign a user function. It receives two arguments:

The first argument is the parameters array containing the site object, the language id, the current table and the current row.
The second argument is the reference object TcaSlug.

The user function should return the string which is then used as the base url.

Example:

<?php
declare(strict_types = 1);

namespace Vendor\Extension\UserFunctions\FormEngine

use TYPO3\CMS\Backend\Form\FormDataProvider\TcaSlug;

class SlugPrefix
{
    public function getPrefix(array $parameters, TcaSlug $reference): string
    {
        return 'custom base url';
    }
}

eval ¶

Datatype

string (list of keywords)

Scope

Proc. / Display

Description

Configuration of field evaluation.

Keywords:

uniqueInSite: evaluate if a record is unique in a page tree (specific to a language).
uniqueInPid: Requires the field to be unique for the current PID among other records on the same page.

No other eval setting is checked for. It is possible to set both eval options, however it is recommended not to do so.

fallbackCharacter ¶

Datatype: string
Scope: Proc. / Display
Description: Character that represents the separator of slug sections, that contain the fieldSeparator.

generatorOptions ¶

Datatype

array

Scope

Display

Description

Holds information about the record fields to be used for slug generation:

fields (array)

Insert several field names (of type string) that will be considered during slug construction.

Can also be used as nested array to combine multiple fields [['nav_title', 'title'], 'other_field'].

Info

Inserting multiple fields in a simple array would result in an concatenated slug.

Nested array values would result in “take nav_title if not empty, otherwise take value from title”.

Examples:

Configuration value	Values of an example page record	Resulting slug
`['nav_title', 'title']`	`['title' => 'Products', 'nav_title' => '', 'subtitle' => '']`	`/products`
`['nav_title', 'title']`	`['title' => 'Products', 'nav_title' => 'Best products', 'subtitle' => '']`	`/best-products/products`
`[['nav_title', 'title']]`	`['title' => 'Products', 'nav_title' => 'Best products', 'subtitle' => '']`	`/best-products`
`['subtitle', 'nav_title', 'title']`	`['title' => 'Products', 'nav_title' => 'Best products', 'subtitle' => 'Product subtitle']`	`/product-subtitle/best-products/products`
`[['nav_title', 'title'], 'subtitle']`	`['title' => 'Products', 'nav_title' => 'Best products', 'subtitle' => 'Product subtitle']`	`/best-products/product-subtitle`
`[['seo_title', 'title'], ['nav_title', 'subtitle']]`	`['title' => 'Products', 'nav_title' => 'Best products', 'subtitle' => 'Product subtitle', 'seo_title' => 'SEO product title']`	`/seo-product-title/best-products`

fieldSeparator (string)

This value will divide the slug parts. If a section value contains this very value, it will be replaced by the value given in fallbackCharacter.

prefixParentPageSlug (boolean)

The slugs of parent pages will be prefixed to the slug for the page itself. Disable it for shorter URLs, but take the higher chance of collision into consideration.

replacements (array)

It allows to replace strings of a slug part. Add one of more array items with the key being the string to replace and the value being the replacement string.

Example:

'config' => [
    'type' => 'slug',
    'generatorOptions' => [
        'fields' => ['title'],
        'replacements' => [
            '(f/m)' => '',
            '/' => '-'
        ],
    ],
    'fallbackCharacter' => '-',
    'prependSlash' => true,
    'eval' => 'uniqueInPid',
],

This will change the provided slug ‘Some Job in city1/city2 (f/m)’ to ‘some-job-in-city1-city2’.

postModifiers (array)

The “slug” TCA type includes a possibility to hook into the generation of a slug via custom TCA generation options. Hooks can be registered via:

$GLOBALS['TCA'][$tableName]['columns'][$fieldName]['config']['generatorOptions']['postModifiers'][] = My\Class::class . '->method';

Consider $tableName = 'pages' and $fieldName = 'slug' inside EXT:myextension/Configuration/TCA/Overrides/table.php:

$GLOBALS['TCA']['pages']['columns']['slug']['config']['generatorOptions']['postModifiers'][] = \My\Class::class . '->modifySlug';

The method then receives an parameter array with the following values:

 [
     'slug' // ... the slug to be used
     'workspaceId' // ... the workspace ID, "0" if in live workspace
     'configuration' // ... the configuration of the TCA field
     'record' // ... the full record to be used
     'pid' // ... the resolved parent page ID
     'prefix' // ... the prefix that was added
     'tableName' // ... the table of the slug field
     'fieldName' // ... the field name of the slug field
];

All hooks need to return the modified slug value.

prependSlash ¶

Datatype: boolean
Scope: Proc. / Display
Description: Defines whether a slug field should contain a prepending slash, e.g. for nested categories with speaking segments