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wp_get_script_polyfill › WordPress Function

Since5.0.0
Deprecatedn/a
› wp_get_script_polyfill ( $scripts, $tests )
Parameters: (2)
  • (WP_Scripts) $scripts WP_Scripts object.
    Required: Yes
  • (string[]) $tests Features to detect.
    Required: Yes
Returns:
  • (string) Conditional polyfill inline script.
Defined at:
Codex:

Returns contents of an inline script used in appending polyfill scripts for browsers which fail the provided tests. The provided array is a mapping from a condition to verify feature support to its polyfill script handle.



Related Functions: wp_get_script_tag, wp_script_is, wp_widget_description, wp_default_script_modules, wp_register_script_module

Source 

function wp_get_script_polyfill( $scripts, $tests ) {
	$polyfill = '';
	foreach ( $tests as $test => $handle ) {
		if ( ! array_key_exists( $handle, $scripts->registered ) ) {
			continue;
		}

		$src = $scripts->registered[ $handle ]->src;
		$ver = $scripts->registered[ $handle ]->ver;

		if ( ! preg_match( '|^(https?:)?//|', $src ) && ! ( $scripts->content_url && str_starts_with( $src, $scripts->content_url ) ) ) {
			$src = $scripts->base_url . $src;
		}

		if ( ! empty( $ver ) ) {
			$src = add_query_arg( 'ver', $ver, $src );
		}

		/** This filter is documented in wp-includes/class-wp-scripts.php */
		$src = esc_url( apply_filters( 'script_loader_src', $src, $handle ) );

		if ( ! $src ) {
			continue;
		}

		$polyfill .= (
			// Test presence of feature...
			'( ' . $test . ' ) || ' .
			/*
			 * ...appending polyfill on any failures. Cautious viewers may balk
			 * at the `document.write`. Its caveat of synchronous mid-stream
			 * blocking write is exactly the behavior we need though.
			 */
			'document.write( \'<script src="' .
			$src .
			'"></scr\' + \'ipt>\' );'
		);
	}

	return $polyfill;
}