WordPress/wp-admin/js/forms.js

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JavaScript
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function checkAll(jQ) { // use attr( checked, fn )
jQuery(jQ).find( 'tbody:visible :checkbox' ).attr( 'checked', function() {
return jQuery(this).attr( 'checked' ) ? '' : 'checked';
} );
}
jQuery( function($) {
var lastClicked = false;
$( 'tbody :checkbox' ).click( function(e) {
if ( 'undefined' == e.shiftKey ) { return true; }
if ( e.shiftKey ) {
if ( !lastClicked ) { return true; }
var checks = $( lastClicked ).parents( 'form:first' ).find( ':checkbox' );
var first = checks.index( lastClicked );
var last = checks.index( this );
if ( 0 < first && 0 < last && first != last ) {
checks.slice( first, last ).attr( 'checked', $( this ).is( ':checked' ) ? 'checked' : '' );
}
}
lastClicked = this;
return true;
} );
$( 'thead :checkbox' ).click( function() {
checkAll( $(this).parents( 'form:first' ) );
} );
} );