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wp_customize_support_script › WordPress Function

Since3.4.0
Deprecatedn/a
› wp_customize_support_script ( No parameters )
Defined at:
Codex:
Change Log:
  • 4.7.0
  • 5.5.0

Prints a script to check whether or not the Customizer is supported, and apply either the no-customize-support or customize-support class to the body.

This function MUST be called inside the body tag. Ideally, call this function immediately after the body tag is opened. This prevents a flash of unstyled content. It is also recommended that you add the "no-customize-support" class to the body tag by default.


Related Functions: wp_customize_url, wp_cache_supports, _wp_customize_loader_settings, wp_timezone_supported, wp_localize_script

Source 

function wp_customize_support_script() {
	$admin_origin = parse_url( admin_url() );
	$home_origin  = parse_url( home_url() );
	$cross_domain = ( strtolower( $admin_origin['host'] ) !== strtolower( $home_origin['host'] ) );
	ob_start();
	?>
	<script>
		(function() {
			var request, b = document.body, c = 'className', cs = 'customize-support', rcs = new RegExp('(^|\\s+)(no-)?'+cs+'(\\s+|$)');

	<?php	if ( $cross_domain ) : ?>
			request = (function(){ var xhr = new XMLHttpRequest(); return ('withCredentials' in xhr); })();
	<?php	else : ?>
			request = true;
	<?php	endif; ?>

			b[c] = b[c].replace( rcs, ' ' );
			// The customizer requires postMessage and CORS (if the site is cross domain).
			b[c] += ( window.postMessage && request ? ' ' : ' no-' ) + cs;
		}());
	</script>
	<?php
	wp_print_inline_script_tag( wp_remove_surrounding_empty_script_tags( ob_get_clean() ) );
}