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;
    });

I found it useful to make the truncation respect full words. Here is a revised version that does just that. If there is only one word, then it will truncate the middle of that word.

Handlebars.registerHelper ('truncate', function (str, len) {
    if (str.length > len && str.length > 0) {
        var new_str = str + " ";
        new_str = str.substr (0, len);
        new_str = str.substr (0, new_str.lastIndexOf(" "));
        new_str = (new_str.length > 0) ? new_str : str.substr (0, len);

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

That's really useful. Thanks for sharing!

Thanks for sharing.

Thanks for sharing - one thing, just add a check for str bc if there's no string you'll get an exception thrown...

if (str && str.length > len) { ...

Thanks for sharing!

thanks for sharing this worked