Field methods

Field methods are registered with the fieldMethods extension.

Default field methods

For a full list of default field methods, please check out the Reference.

Be aware that you cannot override these default field methods with any custom field method.

Getting started

/site/plugins/your-plugin/index.php

Kirby::plugin('your/plugin', [
    'fieldMethods' => [
        'quote' => function ($field) {
            return '“' . $field->value . '”';
        }
    ]
]);

This example shows the basic architecture of creating a new field method. You define the method name with the array key for the fieldsMethod array. The callback function receives the $field object as first argument.

How to use your new field method

<?= $page->title()->quote() ?>

The `$field` object

The object passed to the callback function gives you access to three important attributes.

Attribute	Description
`$field->key()`	Name of the field
`$field->value`	Raw content of the field
`$field->model()`	Parent object: `$page`, `$site`, `$file` or `$user`

Return options

There are three common scenarios, what field methods can do:

1. Modifying the field for further chaining

Kirby::plugin('your/plugin', [
    'fieldMethods' => [
        'quote' => function ($field) {
            $field->value = '“' . $field->value . '”';
            return $field;
        }
    ]
]);

If you want to make it possible that the field value can be further modified by other field methods, you must modify the field value by overwriting/modifying $field->value and returning the $field object.

Example

<?= $page->title()->quote()->lower() ?>

2. Directly returning a modified value

Kirby::plugin('your/plugin', [
    'fieldMethods' => [
        'quote' => function ($field) {
            return '“' . $field->value . '”';
        }
    ]
]);

When you directly return the modified value, further chaining is not possible.

Example

<?= $page->title()->quotes()->lower() ?>
<!-- will throw an error -->

<?= $page->title()->quotes() ?>
<!-- will work fine -->

3. Returning info about the field

Kirby::plugin('your/plugin', [
    'fieldMethods' => [
        'hasQuotes' => function ($field) {
            return preg_match('^“.*”$', $field->value);
        }
    ]
]);

Field methods can also be used to make if clauses easier or return info about a value, such as the length or the readingtime.

Example

<?php if ($page->title()->hasQuotes()): ?>
The title is wrapped in quotes.
<?php endif ?>

Working with method arguments

In some cases it might be helpful to be able to pass arguments to the method:

<?= $page->title()->quote('«', '»') ?>

The definition for such a method with arguments is very simple:

Kirby::plugin('your/plugin', [
    'fieldMethods' => [
        'quote' => function ($field, $start = '“', $end = '”') {
            $field->value = $start . $field->value . $end;
            return $field;
        }
    ]
]);