Native alt text field for assets

CHANGELOG.md

@@ -9,13 +9,16 @@
 - Added the “Inactive” user status, which can be used by users which can’t be signed into. ([#8963](https://github.com/craftcms/cms/discussions/8963))
 - Added “Credentialed” and “Inactive” user sources.
 - Added the “Deactivate…” user action for pending and active users.
+- Craft now provides a native “Alternative Text” (`alt`) field for assets. ([#10302](https://github.com/craftcms/cms/discussions/10302))
+- Asset thumbnails in the control panel now have `alt` attributes, for assets with a filled-in Alternative Text value.
 - Added the `index-assets/cleanup` command.
 - Added the “Deactivate users by default” user registration setting, which replaces “Suspend users by default”. ([#5830](https://github.com/craftcms/cms/issues/5830))
 - Element source settings are now stored in the project config. ([#8616](https://github.com/craftcms/cms/discussions/8616))
 - Added support for `JSON` columns. ([#9089](https://github.com/craftcms/cms/pull/9089))
 - It’s now possible to edit images’ focal points from their preview modals. ([#8489](https://github.com/craftcms/cms/discussions/8489))
 - Added the `assetUploaders` user query param.
 - Added the `authors` user query param.
+- Added the `hasAlt` asset query param.
 - Added support for setting custom config settings from `config/custom.php`, which are accessible via `Craft::$app->config->custom`. ([#10012](https://github.com/craftcms/cms/issues/10012))
 - Added `craft\base\ApplicationTrait::getConditions()`.
 - Added `craft\base\ApplicationTrait::getElementSources()`, which replaces `getElementIndexes()`.
@@ -31,6 +34,7 @@
 - Added `craft\base\conditions\ConditionInterface`.
 - Added `craft\base\conditions\ConditionRuleInterface`.
 - Added `craft\base\ElementInterface::createCondition()`.
+- Added `craft\base\ElementInterface::getThumbAlt()`.
 - Added `craft\base\FieldInterface::getElementConditionRuleType()`.
 - Added `craft\base\FieldLayoutComponent`.
 - Added `craft\base\Volume::CONFIG_MIMETYPE`.
@@ -48,12 +52,14 @@
 - Added `craft\db\Migration::renameTable()`.
 - Added `craft\db\Query::collect()`, which returns the query results as an `Illuminate\Support\Collection` object rather than an array. ([#8513](https://github.com/craftcms/cms/discussions/8513))
 - Added `craft\db\Table::ASSETINDEXINGSESSIONS`.
+- Added `craft\elements\Asset::$alt`.
 - Added `craft\elements\Asset::setFilename()`.
 - Added `craft\elements\conditions\assets\AssetCondition`.
 - Added `craft\elements\conditions\assets\DateModifiedConditionRule`.
 - Added `craft\elements\conditions\assets\FilenameConditionRule`.
 - Added `craft\elements\conditions\assets\FileSizeConditionRule`.
 - Added `craft\elements\conditions\assets\FileTypeConditionRule`.
+- Added `craft\elements\conditions\assets\HasAltConditionRule`.
 - Added `craft\elements\conditions\assets\HeightConditionRule`.
 - Added `craft\elements\conditions\assets\UploaderConditionRule`.
 - Added `craft\elements\conditions\assets\VolumeConditionRule`.
@@ -93,7 +99,9 @@
 - Added `craft\elements\User::STATUS_INACTIVE`.
 - Added `craft\errors\MissingVolumeFolderException`.
 - Added `craft\events\RegisterConditionRuleTypesEvent`.
+- Added `craft\fieldlayoutelements\AssetAltField`.
 - Added `craft\fieldlayoutelements\BaseNativeField`, which replaces `craft\fieldlayoutelements\StandardField`.
+- Added `craft\fieldlayoutelements\TextareaField`.
 - Added `craft\fieldlayoutelements\TextField`, which replaces `craft\fieldlayoutelements\StandardTextField`.
 - Added `craft\fields\Assets::$allowSubfolders`.
 - Added `craft\fields\Assets::$restrictedDefaulUploadSubpath`.
@@ -221,6 +229,7 @@
 - Filtering users by `active`, `pending`, and `locked` statuses no longer excludes suspended users.
 - Assets fields that are restricted to a single location can now be configured to allow selection within subfolders of that location. ([#9070](https://github.com/craftcms/cms/discussions/9070))
 - When an image is saved as a new asset from the Image Editor via an Assets field, the Assets field will now automatically replace the selected asset with the new one. ([#8974](https://github.com/craftcms/cms/discussions/8974))
+- `alt` is now a reserved field handle for volume field layouts.
 - Entry post dates are no longer set automatically until the entry is validated with the `live` scenario. ([#10093](https://github.com/craftcms/cms/pull/10093))
 - Entry queries’ `authorGroup()` param method now accepts an array of `craft\models\UserGroup` objects.
 - Relational fields now load elements in the current site rather than the primary site, if the source element isn’t localizable. ([#7048](https://github.com/craftcms/cms/issues/7048))
@@ -318,15 +327,16 @@
 - Widgets’ `icon()` methods must now have a `?string` return type declaration.
 - Widgets’ `maxColspan()` methods must now have an `?int` return type declaration.
 - `craft\base\AssetPreviewHandlerInterface::getPreviewHtml()` now accepts an optional array of variable to pass on to the template.
-- `craft\base\ElementInterface::getEagerLoadedElements()` now returns an `Illuminate\Support\Collection` object instead of an array. ([#8513](https://github.com/craftcms/cms/discussions/8513))
 - `craft\base\Element::__get()` now clones custom field values before returning them. ([#8781](https://github.com/craftcms/cms/discussions/8781))
 - `craft\base\Element::fieldLayoutFields()` now has a `visibleOnly` argument.
 - `craft\base\Element::getFieldValue()` now returns eager-loaded element values for the field, when they exist. ([#10047](https://github.com/craftcms/cms/issues/10047))
+- `craft\base\ElementInterface::getEagerLoadedElements()` now returns an `Illuminate\Support\Collection` object instead of an array. ([#8513](https://github.com/craftcms/cms/discussions/8513))
 - `craft\base\MemoizableArray` no longer extends `ArrayObject`, and now implements `IteratorAggregate` and `Countable` directly.
 - `craft\base\Model::datetimeAttributes()` is now called from the constructor, instead of the `init()` method.
 - `craft\base\Model::setAttributes()` now normalizes date attributes into `DateTime` objects.
-- `craft\db\Command` methods with `$includeAuditColumns` arguments now ensure the table actually has audit columns before modifying the query.
 - `craft\db\Command::upsert()` no longer merges the `$updateColumns` array into `$insertColumns`. The full array of `INSERT` column values should be passed to `$insertColumns` now.
+- `craft\db\Command` methods with `$includeAuditColumns` arguments now ensure the table actually has audit columns before modifying the query.
+- `craft\elements\Asset::getImg()` now sets the `alt` attribute to the native Alternative Text field value, if set.
 - `craft\elements\db\ElementQuery::ids()` no longer accepts an array of criteria params.
 - `craft\events\DraftEvent::$source` has been renamed to `$canonical`.
 - `craft\events\GetAssetThumbUrlEvent` has been renamed to `DefineAssetThumbUrlEvent`.
@@ -344,10 +354,10 @@
 - `craft\services\Announcements::push()` no longer accepts callables to be passed to the `$heading` and `$body` arguments. `craft\i18n\Translation::prep()` should be used to prepare the messages to be lazy-translated instead.
 - `craft\services\AssetIndexer::storeIndexList()` now expects the first argument to be a generator that returns `craft\models\VolumeListing` objects.
 - `craft\services\Assets::ensureFolderByFullPathAndVolume()` now returns a `craft\models\VolumeFolder` object rather than a folder ID.
+- `craft\services\Assets::ensureTopFolder()` now returns a `craft\models\VolumeFolder` object rather than a folder ID.
 - `craft\services\Assets::EVENT_GET_ASSET_THUMB_URL` has been renamed to `EVENT_DEFINE_THUMB_URL`.
 - `craft\services\Assets::EVENT_GET_ASSET_URL` has been renamed to `EVENT_DEFINE_ASSET_URL`.
 - `craft\services\Assets::EVENT_GET_THUMB_PATH` has been renamed to `EVENT_DEFINE_THUMB_PATH`.
-- `craft\services\Assets::ensureTopFolder()` now returns a `craft\models\VolumeFolder` object rather than a folder ID.
 - `craft\services\Plugins::doesPluginRequireDatabaseUpdate()` has been renamed to `isPluginUpdatePending()`.
 - `craft\services\Updates::getIsCraftDbMigrationNeeded()` has been renamed to `getIsCraftUpdatePending()`.
 - `craft\services\Updates::getIsPluginDbUpdateNeeded()` has been renamed to `getIsPluginUpdatePending()`.

src/base/ApplicationTrait.php

@@ -26,6 +26,7 @@
 use craft\events\DeleteSiteEvent;
 use craft\events\EditionChangeEvent;
 use craft\events\FieldEvent;
+use craft\fieldlayoutelements\AssetAltField;
 use craft\fieldlayoutelements\AssetTitleField;
 use craft\fieldlayoutelements\EntryTitleField;
 use craft\fieldlayoutelements\TitleField;
@@ -1508,6 +1509,7 @@ private function _registerFieldLayoutListener(): void
                     break;
                 case Asset::class:
                     $event->fields[] = AssetTitleField::class;
+                    $event->fields[] = AssetAltField::class;
                     break;
                 case Entry::class:
                     $event->fields[] = EntryTitleField::class;

src/base/Element.php

@@ -2713,6 +2713,14 @@ public function getThumbUrl(int $size): ?string
         return null;
     }
 
+    /**
+     * @inheritdoc
+     */
+    public function getThumbAlt(): ?string
+    {
+        return null;
+    }
+
     /**
      * @inheritdoc
      */

src/base/ElementInterface.php

@@ -790,6 +790,14 @@ public function getPreviewTargets(): array;
      */
     public function getThumbUrl(int $size): ?string;
 
+    /**
+     * Returns alt text for the element’s thumbnail.
+     *
+     * @return string|null
+     * @since 4.0.0
+     */
+    public function getThumbAlt(): ?string;
+
     /**
      * Returns whether the element’s thumbnail should have a checkered background.
      *

src/base/Volume.php

@@ -103,6 +103,7 @@ public function validateFieldLayout(): void
     {
         $fieldLayout = $this->getFieldLayout();
         $fieldLayout->reservedFieldHandles = [
+            'alt',
             'folder',
             'volume',
         ];

src/elements/Asset.php

@@ -589,6 +589,12 @@ private static function _assembleSourceInfoForFolder(VolumeFolder $folder, bool
      */
     public ?string $kind = null;
 
+    /**
+     * @var string|null Alternative text
+     * @since 4.0.0
+     */
+    public ?string $alt = null;
+
     /**
      * @var int|null Size
      */
@@ -780,6 +786,11 @@ public function __get($name)
     public function init(): void
     {
         parent::init();
+
+        if ($this->alt === '') {
+            $this->alt = null;
+        }
+
         $this->_oldVolumeId = $this->_volumeId;
     }
 
@@ -967,7 +978,7 @@ public function getImg($transform = null, ?array $sizes = null): ?Markup
             'width' => $this->getWidth(),
             'height' => $this->getHeight(),
             'srcset' => $sizes ? $this->getSrcset($sizes) : false,
-            'alt' => $this->title,
+            'alt' => $this->alt ?? $this->title,
         ]);
 
         if (isset($oldTransform)) {
@@ -1305,6 +1316,14 @@ public function getThumbUrl(int $size): ?string
         return Craft::$app->getAssets()->getThumbUrl($this, $width, $height, false);
     }
 
+    /**
+     * @inheritdoc
+     */
+    public function getThumbAlt(): ?string
+    {
+        return $this->alt;
+    }
+
     /**
      * @inheritdoc
      */
@@ -1995,6 +2014,7 @@ public function afterSave(bool $isNew): void
             $record->folderId = (int)$this->folderId;
             $record->uploaderId = (int)$this->uploaderId ?: null;
             $record->kind = $this->kind;
+            $record->alt = $this->alt;
             $record->size = (int)$this->size ?: null;
             $record->width = (int)$this->_width ?: null;
             $record->height = (int)$this->_height ?: null;

src/elements/conditions/assets/AssetCondition.php

@@ -22,6 +22,7 @@ protected function conditionRuleTypes(): array
             FileSizeConditionRule::class,
             FileTypeConditionRule::class,
             FilenameConditionRule::class,
+            HasAltConditionRule::class,
             HeightConditionRule::class,
             UploaderConditionRule::class,
             VolumeConditionRule::class,

src/elements/conditions/assets/HasAltConditionRule.php

@@ -0,0 +1,54 @@
+<?php
+
+namespace craft\elements\conditions\assets;
+
+use Craft;
+use craft\base\conditions\BaseLightswitchConditionRule;
+use craft\base\ElementInterface;
+use craft\elements\Asset;
+use craft\elements\conditions\ElementConditionRuleInterface;
+use craft\elements\db\AssetQuery;
+use craft\elements\db\ElementQueryInterface;
+
+/**
+ * “Has alternative text” condition rule for assets.
+ *
+ * @author Pixel & Tonic, Inc. <support@pixelandtonic.com>
+ * @since 4.0.0
+ */
+class HasAltConditionRule extends BaseLightswitchConditionRule implements ElementConditionRuleInterface
+{
+    /**
+     * @inheritdoc
+     */
+    public function getLabel(): string
+    {
+        return Craft::t('app', 'Has alternative text');
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function getExclusiveQueryParams(): array
+    {
+        return ['hasAlt'];
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function modifyQuery(ElementQueryInterface $query): void
+    {
+        /** @var AssetQuery $query */
+        $query->hasAlt($this->value);
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function matchElement(ElementInterface $element): bool
+    {
+        /** @var Asset $element */
+        return $this->matchValue($element->alt !== null);
+    }
+}

src/elements/db/AssetQuery.php

@@ -125,6 +125,13 @@ class AssetQuery extends ElementQuery
      */
     public $kind;
 
+    /**
+     * @var bool|null Whether the query should filter assets depending on whether they have alternative text.
+     * @used-by hasAlt()
+     * @since 4.0.0
+     */
+    public ?bool $hasAlt = null;
+
     /**
      * @var mixed The width (in pixels) that the resulting assets must have.
      * ---
@@ -495,6 +502,19 @@ public function kind($value): self
         return $this;
     }
 
+    /**
+     * Narrows the query results based on whether the assets have alternative text.
+     *
+     * @param bool|null $value The property value
+     * @return self self reference
+     * @uses $hasAlt
+     */
+    public function hasAlt(?bool $value = true): self
+    {
+        $this->hasAlt = $value;
+        return $this;
+    }
+
     /**
      * Narrows the query results based on the assets’ image widths.
      *
@@ -783,6 +803,7 @@ protected function beforePrepare(): bool
             'assets.uploaderId',
             'assets.filename',
             'assets.kind',
+            'assets.alt',
             'assets.width',
             'assets.height',
             'assets.size',
@@ -831,6 +852,10 @@ protected function beforePrepare(): bool
             $this->subQuery->andWhere($kindCondition);
         }
 
+        if ($this->hasAlt !== null) {
+            $this->subQuery->andWhere($this->hasAlt ? ['not', ['assets.alt' => null]] : ['assets.alt' => null]);
+        }
+
         if ($this->width) {
             $this->subQuery->andWhere(Db::parseNumericParam('assets.width', $this->width));
         }

src/fieldlayoutelements/AssetAltField.php

@@ -0,0 +1,83 @@
+<?php
+/**
+ * @link https://craftcms.com/
+ * @copyright Copyright (c) Pixel & Tonic, Inc.
+ * @license https://craftcms.github.io/license/
+ */
+
+namespace craft\fieldlayoutelements;
+
+use Craft;
+use craft\base\ElementInterface;
+use craft\base\Field;
+use craft\elements\Asset;
+use craft\helpers\ElementHelper;
+use yii\base\InvalidArgumentException;
+
+/**
+ * AssetAltField represents an Alternative Text field that can be included within a volume’s field layout designer.
+ *
+ * @author Pixel & Tonic, Inc. <support@pixelandtonic.com>
+ * @since 4.0.0
+ */
+class AssetAltField extends TextareaField
+{
+    /**
+     * @inheritdoc
+     */
+    public string $attribute = 'alt';
+
+    /**
+     * @inheritdoc
+     */
+    public bool $translatable = true;
+
+    /**
+     * @inheritdoc
+     */
+    public function __construct($config = [])
+    {
+        // We didn't start removing autofocus from fields() until 3.5.6
+        unset(
+            $config['mandatory'],
+            $config['attribute'],
+            $config['translatable'],
+            $config['maxlength'],
+            $config['autofocus']
+        );
+
+        parent::__construct($config);
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function fields(): array
+    {
+        $fields = parent::fields();
+        unset(
+            $fields['mandatory'],
+            $fields['attribute'],
+            $fields['translatable'],
+            $fields['maxlength'],
+            $fields['autofocus']
+        );
+        return $fields;
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function defaultLabel(?ElementInterface $element = null, bool $static = false): ?string
+    {
+        return Craft::t('app', 'Alternative Text');
+    }
+
+    /**
+     * @inheritdoc
+     */
+    protected function translationDescription(?ElementInterface $element = null, bool $static = false): ?string
+    {
+        return Field::TRANSLATION_METHOD_SITE;
+    }
+}