Truncate helper for Handlebars.js

handlebars-truncate-helper.js

    Handlebars.registerHelper ('truncate', function (str, len) {
        if (str.length > len) {
            var new_str = str.substr (0, len+1);

            while (new_str.length) {
                var ch = new_str.substr ( -1 );
                new_str = new_str.substr ( 0, -1 );

                if (ch == ' ') {
                    break;
                }
            }

            if ( new_str == '' ) {
                new_str = str.substr ( 0, len );
            }

            return new Handlebars.SafeString ( new_str +'...' ); 
        }
        return str;
    });

thanks for sharing this worked