Forked from futtta/autoptimize_defer_inline_jquery.php
Created
March 29, 2019 10:02
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POC to defer inline JS that requires jQuery
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<?php | |
add_action('plugins_loaded','ao_defer_inline_init'); | |
function ao_defer_inline_init() { | |
if ( get_option('autoptimize_js_include_inline') != 'on' ) { | |
add_filter('autoptimize_html_after_minify','ao_defer_inline_jquery',10,1); | |
} | |
} | |
function ao_defer_inline_jquery( $in ) { | |
if ( preg_match_all( '#<script.*>(.*)</script>#Usmi', $in, $matches, PREG_SET_ORDER ) ) { | |
foreach( $matches as $match ) { | |
if ( $match[1] !== '' && ( strpos( $match[1], 'jQuery' ) !== false || strpos( $match[1], '$' ) !== false ) ) { | |
// inline js that requires jquery, wrap deferring JS around it to defer it. | |
$new_match = 'var aoDeferInlineJQuery=function(){'.$match[1].'}; if (document.readyState === "loading") {document.addEventListener("DOMContentLoaded", aoDeferInlineJQuery);} else {aoDeferInlineJQuery();}'; | |
$in = str_replace( $match[1], $new_match, $in ); | |
} else if ( $match[1] === '' && strpos( $match[0], 'src=' ) !== false && strpos( $match[0], 'defer' ) === false ) { | |
// linked non-aggregated JS, defer it. | |
$new_match = str_replace( '<script ', '<script defer ', $match[0] ); | |
$in = str_replace( $match[0], $new_match, $in ); | |
} | |
} | |
} | |
return $in; | |
} |
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