Craft 3 Class Reference

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FieldInterface ​

Type
Interface
Namespace
craft\base
Extends
craft\base\SavableComponentInterface
Implemented by
craft\base\Field, craft\fields\Assets, craft\fields\BaseOptionsField, craft\fields\BaseRelationField, craft\fields\Categories, craft\fields\Checkboxes, craft\fields\Color, craft\fields\Date, craft\fields\Dropdown, craft\fields\Email, craft\fields\Entries, craft\fields\Lightswitch, craft\fields\Matrix, craft\fields\MissingField, craft\fields\MultiSelect, craft\fields\Number, craft\fields\PlainText, craft\fields\RadioButtons, craft\fields\Table, craft\fields\Tags, craft\fields\Time, craft\fields\Url, craft\fields\Users
Since
3.0.0

FieldInterface defines the common interface to be implemented by field classes.

A class implementing this interface should also use craft\base\SavableComponentTrait and craft\base\FieldTrait.

View source

Public Methods ​

MethodDescription
afterDelete()Performs actions after a component is deleted.
afterElementDelete()Performs actions after the element has been deleted.
afterElementPropagate()Performs actions after the element has been fully saved and propagated to other sites.
afterElementRestore()Performs actions after the element has been restored.
afterElementSave()Performs actions after the element has been saved.
afterSave()Performs actions after a component is saved.
beforeApplyDelete()Performs actions before a component delete is applied to the database.
beforeDelete()Performs actions before a component is deleted.
beforeElementDelete()Performs actions before an element is deleted.
beforeElementRestore()Performs actions before an element is restored.
beforeElementSave()Performs actions before an element is saved.
beforeSave()Performs actions before a component is saved.
copyValue()Copies the field’s value from one element to another.
displayName()Returns the display name of this class.
getContentColumnType()Returns the column type(s) that this field should get within the content table.
getContentGqlMutationArgumentType()Returns the GraphQL type to be used as an argument in mutations for this field type.
getContentGqlQueryArgumentType()Returns the GraphQL type to be used as an argument in queries for this field type.
getContentGqlType()Returns the GraphQL type to be used for this field type.
getElementValidationRules()Returns the validation rules for an element with this field.
getGroup()Returns the field’s group.
getInputHtml()Returns the field’s input HTML.
getInputId()Returns the input’s ID, which the <label>’s for attribute should reference.
getIsNew()Returns whether the component is new (unsaved).
getIsTranslatable()Returns whether the field should be shown as translatable in the UI.
getOrientation()Returns the orientation the field should use (ltr or rtl).
getSearchKeywords()Returns the search keywords that should be associated with this field.
getSettings()Returns an array of the component’s settings.
getSettingsHtml()Returns the component’s settings HTML.
getStaticHtml()Returns a static (non-editable) version of the field’s input HTML.
getStatus()Returns the status of the field for a given element.
getTranslationDescription()Returns the description of this field’s translation support.
getTranslationKey()Returns the field’s translation key, based on a given element.
hasContentColumn()Returns whether this field has a column in the content table.
includeInGqlSchema()Returns whether the field should be included in the given GraphQL schema.
isSelectable()Returns whether the component should be selectable in component Type selects.
isValueEmpty()Returns whether the given value should be considered “empty” to a validator.
modifyElementIndexQuery()Modifies an element index query.
modifyElementsQuery()Modifies an element query.
normalizeValue()Normalizes the field’s value for use.
serializeValue()Prepares the field’s value to be stored somewhere, like the content table.
setIsFresh()Sets whether the field is fresh.
settingsAttributes()Returns the list of settings attribute names.
supportedTranslationMethods()Returns which translation methods the field supports.
useFieldset()Returns whether the field should use a <fieldset> + <legend> instead of a <div> + <label>.
valueType()Returns the PHPDoc type this field’s values will have.

afterElementDelete() ​

Performs actions after the element has been deleted.

View source

Arguments ​

afterElementPropagate() ​

Since
3.2.0

Performs actions after the element has been fully saved and propagated to other sites.

View source

Arguments ​

afterElementRestore() ​

Since
3.1.0

Performs actions after the element has been restored.

View source

Arguments ​

afterElementSave() ​

Performs actions after the element has been saved.

View source

Arguments ​

beforeElementDelete() ​

Performs actions before an element is deleted.

View source

Arguments ​

Returns ​

boolean – Whether the element should be deleted

beforeElementRestore() ​

Since
3.1.0

Performs actions before an element is restored.

View source

Arguments ​

Returns ​

boolean – Whether the element should be restored

beforeElementSave() ​

Performs actions before an element is saved.

View source

Arguments ​

Returns ​

boolean – Whether the element should be saved

copyValue() ​

Since
3.7.0

Copies the field’s value from one element to another.

View source

Arguments ​

Returns ​

void

getContentColumnType() ​

Returns the column type(s) that this field should get within the content table.

This method will only be called if hasContentColumn() returns true.

If the field type requires multiple columns, an array should be returned:

php
return [
    'date' => 'datetime',
    'tz' => 'string',
];

When this is the case, all columns’ values will be passed to normalizeValue() as an associative array, whose keys match the keys returned by this method. The field type should also override serializeValue() to ensure values are being returned as associative arrays using the same keys.

See also yii\db\QueryBuilder::getColumnType()View source

Returns ​

string, string[] – The column type(s). yii\db\QueryBuilder::getColumnType() will be called to convert the give column type to the physical one. For example, string will be converted as varchar(255) and string(100) becomes varchar(100). not null will automatically be appended as well.

getContentGqlMutationArgumentType() ​

Since
3.5.0

Returns the GraphQL type to be used as an argument in mutations for this field type.

View source

Returns ​

\GraphQL\Type\Definition\Type, array

getContentGqlQueryArgumentType() ​

Since
3.5.0

Returns the GraphQL type to be used as an argument in queries for this field type.

View source

Returns ​

\GraphQL\Type\Definition\Type, array

getContentGqlType() ​

Since
3.3.0

Returns the GraphQL type to be used for this field type.

View source

Returns ​

\GraphQL\Type\Definition\Type, array

getElementValidationRules() ​

Returns the validation rules for an element with this field.

Rules should be defined in the array syntax required by yii\base\Model::rules(), with one difference: you can skip the first argument (the attribute list).

php
[
    // explicitly specify the field attribute
    [$this->handle, 'string', 'min' => 3, 'max' => 12],
    // skip the field attribute
    ['string', 'min' => 3, 'max' => 12],
    // you can only pass the validator class name/handle if not setting any params
    'bool',
]

To register validation rules that should only be enforced for live elements, set the rule scenario to live:

php
[
    ['string', 'min' => 3, 'max' => 12, 'on' => \craft\base\Element::SCENARIO_LIVE],
]

View source

Returns ​

array

getGroup() ​

Returns the field’s group.

View source

Returns ​

craft\models\FieldGroup, null

getInputHtml() ​

Returns the field’s input HTML.

An extremely simple implementation would be to directly return some HTML:

php
return '<textarea name="'.$name.'">'.$value.'</textarea>';

For more complex inputs, you might prefer to create a template, and render it via craft\web\View::renderTemplate(). For example, the following code would render a template located at path/to/myplugin/templates/_fieldinput.html, passing the $name and $value variables to it:

php
return Craft::$app->view->renderTemplate('myplugin/_fieldinput', [
    'name'  => $name,
    'value' => $value
]);

If you need to tie any JavaScript code to your input, it’s important to know that any name and id attributes within the returned HTML will probably get namespaced, however your JavaScript code will be left untouched. For example, if getInputHtml() returns the following HTML:

html
<textarea id="foo" name="foo"></textarea>
<script type="text/javascript">
  var textarea = document.getElementById('foo');
</script>

…then it might actually look like this before getting output to the browser:

html
<textarea id="namespace-foo" name="namespace[foo]"></textarea>
<script type="text/javascript">
  var textarea = document.getElementById('foo');
</script>

As you can see, that JavaScript code will not be able to find the textarea, because the textarea’s id attribute was changed from foo to namespace-foo. Before you start adding namespace- to the beginning of your element ID selectors, keep in mind that the actual namespace is going to change depending on the context. Often they are randomly generated. So it’s not quite that simple.

Thankfully, Craft provides a couple handy methods that can help you deal with this:

So here’s what a getInputHtml() method that includes field-targeting JavaScript code might look like:

php
public function getInputHtml($value, $element)
{
    // Generate a valid ID based on the input name
    $id = craft\helpers\Html::id($name);
    // Figure out what that ID is going to be namespaced into
    $namespacedId = Craft::$app->view->namespaceInputId($id);
    // Render and return the input template
    return Craft::$app->view->renderTemplate('myplugin/_fieldinput', [
        'name' => $name,
        'id' => $id,
        'namespacedId' => $namespacedId,
        'value' => $value,
    ]);
}

And the _fieldinput.html template might look like this:

twig
<textarea id="{{ id }}" name="{{ name }}">{{ value }}</textarea>
<script type="text/javascript">
  var textarea = document.getElementById('{{ namespacedId }}');
</script>

The same principles also apply if you’re including your JavaScript code with craft\web\View::registerJs().

View source

Arguments ​

  • $value (mixed) – The field’s value. This will either be the normalized value, raw POST data (i.e. if there was a validation error), or null
  • $element (craft\base\ElementInterface, null) – The element the field is associated with, if there is one

Returns ​

string – The input HTML.

getInputId() ​

Since
3.7.32

Returns the input’s ID, which the <label>’s for attribute should reference.

View source

Returns ​

string

getIsTranslatable() ​

Returns whether the field should be shown as translatable in the UI.

Note this method has no effect on whether the field’s value will get copied over to other sites when the element is actually getting saved. That is determined by getTranslationKey().

View source

Arguments ​

Returns ​

boolean

getOrientation() ​

Since
3.7.5

Returns the orientation the field should use (ltr or rtl).

View source

Arguments ​

Returns ​

string

getSearchKeywords() ​

Returns the search keywords that should be associated with this field.

The keywords can be separated by commas and/or whitespace; it doesn’t really matter. craft\services\Search will be able to find the individual keywords in whatever string is returned, and normalize them for you.

View source

Arguments ​

  • $value (mixed) – The field’s value
  • $element (craft\base\ElementInterface) – The element the field is associated with, if there is one

Returns ​

string – A string of search keywords.

getStaticHtml() ​

Returns a static (non-editable) version of the field’s input HTML.

This function is called to output field values when viewing element drafts.

View source

Arguments ​

Returns ​

string – The static version of the field’s input HTML

getStatus() ​

Since
3.7.0

Returns the status of the field for a given element.

If the field has a known status, an array should be returned with two elements:

  • The status class (modified, outdated, or conflicted)
  • The status label

For example:

php
return ['modified', 'The field has been modified.');

View source

Arguments ​

Returns ​

array, null

getTranslationDescription() ​

Since
3.4.0

Returns the description of this field’s translation support.

View source

Arguments ​

Returns ​

string, null

getTranslationKey() ​

Returns the field’s translation key, based on a given element.

When saving an element on a multi-site Craft install, if $propagate is true for craft\services\Elements::saveElement(), then getTranslationKey() will be called for each custom field and for each site the element should be propagated to. If the method returns the same value as it did for the initial site, then the initial site’s value will be copied over to the target site.

View source

Arguments ​

Returns ​

string – The translation key

hasContentColumn() ​

Returns whether this field has a column in the content table.

WARNING

If you set this to false, you will be on your own in terms of saving and retrieving your field values.

View source

Returns ​

boolean

includeInGqlSchema() ​

Since
3.6.0

Returns whether the field should be included in the given GraphQL schema.

View source

Arguments ​

  • $schema

Returns ​

boolean

isValueEmpty() ​

Returns whether the given value should be considered “empty” to a validator.

See also yii\validators\Validator::$isEmptyView source

Arguments ​

  • $value (mixed) – The field’s value
  • $element (craft\base\ElementInterface) – The element the field is associated with, if there is one

Returns ​

boolean – Whether the value should be considered “empty”

modifyElementIndexQuery() ​

Since
3.0.9

Modifies an element index query.

This method will be called whenever an element index is being loaded, which contains a column for this field.

View source

Arguments ​

modifyElementsQuery() ​

Modifies an element query.

This method will be called whenever elements are being searched for that may have this field assigned to them. If the method returns false, the query will be stopped before it ever gets a chance to execute.

View source

Arguments ​

Returns ​

null, false – false in the event that the method is sure that no elements are going to be found.

normalizeValue() ​

Normalizes the field’s value for use.

This method is called when the field’s value is first accessed from the element. For example, the first time element.myFieldHandle is called from a template, or right before getInputHtml() is called. Whatever this method returns is what element.myFieldHandle will likewise return, and what getInputHtml()’s and serializeValue()’s $value arguments will be set to.

The value passed into this method will vary depending on the context.

  • If a new, unsaved element is being edited for the first time (such as an entry within a Quick Post widget on the Dashboard), the value will be null.
  • If an element is currently being saved, the value will be the field’s POST data.
  • If an existing element was retrieved from the database, the value will be whatever is stored in the field’s content table column. (Or if the field doesn’t have a content table column per hasContentColumn(), the value will be null.)

There are cases where a pre-normalized value could be passed in as well, so be sure to account for that.

View source

Arguments ​

Returns ​

mixed – The prepared field value

serializeValue() ​

Prepares the field’s value to be stored somewhere, like the content table.

Data types that are JSON-encodable are safe (arrays, integers, strings, booleans, etc). Whatever this returns should be something normalizeValue() can handle.

View source

Arguments ​

Returns ​

mixed – The serialized field value

setIsFresh() ​

Sets whether the field is fresh.

View source

Arguments ​

  • $isFresh (boolean, null) – Whether the field is fresh.

supportedTranslationMethods() ​

Returns which translation methods the field supports.

This method should return an array with at least one of the following values:

  • 'none' (values will always be copied to other sites)
  • 'language' (values will be copied to other sites with the same language)
  • 'site' (values will never be copied to other sites)
  • 'custom' (values will be copied/not copied depending on a custom translation key)

See also getTranslationKey()View source

Returns ​

string[]

useFieldset() ​

Since
3.6.0

Returns whether the field should use a <fieldset> + <legend> instead of a <div> + <label>.

View source

Returns ​

boolean

valueType() ​

Since
3.2.0

Returns the PHPDoc type this field’s values will have.

It will be used by the generated CustomFieldBehavior class.

If the values can be of more than one type, return multiple types separated by |s.

php
public static function phpDocType()
{
     return 'int|mixed|\\craft\\elements\\db\\ElementQuery';
}

View source

Returns ​

string