wikimedia/mediawiki-core

/**
 * Enable checkboxes to be checked or unchecked in a row by clicking one,
 * holding shift and clicking another one.
 *
 * @method checkboxShift
 * @memberof module:mediawiki.page.ready
 * @param {jQuery} $box
 */
module.exports = function ( $box ) {
    var prev;
    // When our boxes are clicked..
    $box.on( 'click', function ( e ) {
        // And one has been clicked before...
        if ( prev && e.shiftKey ) {
            // Check or uncheck this one and all in-between checkboxes,
            // except for disabled ones
            $box
                .slice(
                    Math.min( $box.index( prev ), $box.index( e.target ) ),
                    Math.max( $box.index( prev ), $box.index( e.target ) ) + 1
                )
                .filter( function () {
                    return !this.disabled && this.checked !== e.target.checked;
                } )
                .prop( 'checked', e.target.checked )
                // Since the state change is a consequence of direct user action,
                // fire the 'change' event (see T313077).
                .trigger( 'change' );
        }
        // Either way, remember this as the last clicked one
        prev = e.target;
    } );
};