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WP_Customize_Widgets::export_preview_data()

Communicates the sidebars that appeared on the page at the very end of the page, and at the very end of the wp_footer,

Source

File: wp-includes/class-wp-customize-widgets.php 

public function export_preview_data() {
		global $wp_registered_sidebars, $wp_registered_widgets;

		$switched_locale = switch_to_locale( get_user_locale() );

		$l10n = array(
			'widgetTooltip' => __( 'Shift-click to edit this widget.' ),
		);

		if ( $switched_locale ) {
			restore_previous_locale();
		}

		$rendered_sidebars = array_filter( $this->rendered_sidebars );
		$rendered_widgets  = array_filter( $this->rendered_widgets );

		// Prepare Customizer settings to pass to JavaScript.
		$settings = array(
			'renderedSidebars'            => array_fill_keys( array_keys( $rendered_sidebars ), true ),
			'renderedWidgets'             => array_fill_keys( array_keys( $rendered_widgets ), true ),
			'registeredSidebars'          => array_values( $wp_registered_sidebars ),
			'registeredWidgets'           => $wp_registered_widgets,
			'l10n'                        => $l10n,
			'selectiveRefreshableWidgets' => $this->get_selective_refreshable_widgets(),
		);

		foreach ( $settings['registeredWidgets'] as &$registered_widget ) {
			unset( $registered_widget['callback'] ); // May not be JSON-serializeable.
		}

		?>
		<script type="text/javascript">
			var _wpWidgetCustomizerPreviewSettings = <?php echo wp_json_encode( $settings ); ?>;
		</script>
		<?php
	}

Uses

Uses Description
wp-includes/l10n.php: restore_previous_locale()

Restores the translations according to the previous locale.
wp-includes/l10n.php: switch_to_locale()

Switches the translations according to the given locale.
wp-includes/l10n.php: get_user_locale()

Retrieves the locale of a user.
wp-includes/class-wp-customize-widgets.php: WP_Customize_Widgets::get_selective_refreshable_widgets()

List whether each registered widget can be use selective refresh.
wp-includes/functions.php: wp_json_encode()

Encode a variable into JSON, with some sanity checks.
wp-includes/l10n.php: __()

Retrieve the translation of $text.

Changelog

Version Description
3.9.0 Introduced.

© 2003–2019 WordPress Foundation
Licensed under the GNU GPLv2+ License.
https://developer.wordpress.org/reference/classes/wp_customize_widgets/export_preview_data