Question

(How) can I use dynamicHelpers with extend parameters like this?

app.dynamicHelpers({
    getImageUrl: function (req, res, imageName) {
        return "http://" + req.headers.host + app.set("imageUrl")+"/" + imageName;
    }
});

how can I call this from my template engine?

Answer 1

You return a function from your function:

app.dynamicHelpers({
    getImageUrl: function (req, res) {
        return function(imageName) {
            return "http://" + req.headers.host + app.set("imageUrl") + "/" + imageName;
        }
    }
});

In your template, you use getImageUrl("some image.jpg").