public FilterProcessResult::createPlaceholder($callback, array $args)
Creates a placeholder.
This generates its own placeholder markup for one major reason: to not have FilterProcessResult depend on the Renderer service, because this is a value object. As a side-effect and added benefit, this makes it easier to distinguish placeholders for filtered text versus generic render system placeholders.
Parameters
string $callback: The #lazy_builder callback that will replace the placeholder with its eventual markup.
array $args: The arguments for the #lazy_builder callback.
Return value
string The placeholder markup.
File
- core/modules/filter/src/FilterProcessResult.php, line 133
Class
- FilterProcessResult
- Used to return values from a text filter plugin's processing method.
Namespace
Drupal\filter
Code
public function createPlaceholder($callback, array $args) {
// Generate placeholder markup.
// @see \Drupal\Core\Render\PlaceholderGenerator::createPlaceholder()
$arguments = UrlHelper::buildQuery($args);
$token = hash('crc32b', serialize([$callback, $args]));
$placeholder_markup = '<drupal-filter-placeholder callback="' . Html::escape($callback) . '" arguments="' . Html::escape($arguments) . '" token="' . Html::escape($token) . '"></drupal-filter-placeholder>';
// Add the placeholder attachment.
$this->addAttachments([
'placeholders' => [
$placeholder_markup => [
'#lazy_builder' => [$callback, $args],
]
],
]);
// Return the placeholder markup, so that the filter wanting to use a
// placeholder can actually insert the placeholder markup where it needs the
// placeholder to be replaced.
return $placeholder_markup;
}
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