[SOLVED] Hunchentoot/easy-routes - return multiple values to the dom?

Hunchentoot/easy-routes - return multiple values to the dom?

I have a :get route with easy-routes that, when hit, runs one function (quick-test). The function quick-test returns two values. Both are strings.

(easy-routes:defroute test-file ("/test-file" :method :get) (&get filename)
  (quick-test filename))

However, when the form is sent to "/test-file", only one line is visible in the dom.

I then tried using multiple value bind. But the result is the same.

(easy-routes:defroute test-file ("/test-file" :method :get) (&get filename)
  (multiple-value-bind (a b) (quick-test filename)
    (values (format nil "~a" a)
        (format nil "~a" b))))

My goal is to be able to run quick test and see all returned values on the dom.

Is there a way to do that?

For completeness, here is the form:

<form id="form" action="/test-file" method="get">
    <input type="text" name="filename" placeholder="type the filename"/>
    <input type="submit" value="Send"/>
  </form>

Solution

Values can return more values, but if your function expects some expression, it takes only the first returned value and discards the rest. For example, floor returns two values, but + takes only the first:

> (floor 5 2)
2
1

> (+ 2 (floor 5 2))
4

This question can also help you: values function in Common Lisp

Defroute probably does the same and takes only the first value.

You can fix your route for example like this:

(easy-routes:defroute test-file ("/test-file" :method :get) (&get filename)
  (multiple-value-bind (a b) (quick-test filename)
    (format nil "~a, ~a" a b)))