https://lostudio.ru/wp-content/plugins/custom-search-plugin/js/script.js?ver=1.51

1( function( $ ) {
2	$( document ).ready( function() {
3		$('#main>.cstmsrch-submit-type').detach().prependTo('#content');
4		$( '#cstmsrch_div_select_all' ).show( 0, function() {
5			var select_all			= $( '.cstmsrch-form-table input#cstmsrch_select_all' ),
6				checkboxes			= $( '.cstmsrch-form-table input[name="cstmsrch_fields_array[]"]:enabled' ),
7				checkboxes_total	= checkboxes.size(),
8				checkboxes_selected	= checkboxes.filter(':checked').size();
9			if ( checkboxes_total == checkboxes_selected ) {
10				select_all.prop( 'checked', true );
11			}
12		});
13		$( '.cstmsrch-form-table input' ).bind( 'change click select', function() {
14			var	select_all					= $( '.cstmsrch-form-table input#cstmsrch_select_all' ),
15				checkboxes					= $( '.cstmsrch-form-table input[name="cstmsrch_fields_array[]"]:enabled' ),
16				checkboxes_size				= checkboxes.size(),
17				checkboxes_selected_size	= checkboxes.filter( ':checked' ).size();
18			if ( $( this ).attr( 'id' ) == select_all.attr( 'id' ) ) {
19				if ( select_all.is( ':checked' ) ) {
20					checkboxes.prop( 'checked', true );
21				} else {
22					checkboxes.prop( 'checked', false );
23				}
24			} else {
25				if ( checkboxes_size == checkboxes_selected_size ) {
26					select_all.prop( 'checked', true );
27				} else {
28					select_all.prop( 'checked', false );
29				}
30			}
31		} );
32	} );
33} )( jQuery );