How to pass res from one function to another?

Question

FB.api('4', function (res) {
  if(!res || res.error) {
   console.log(!res ? 'error occurred' : res.error);
   return;
  }
  console.log(res.id);
  console.log(res.name);
});

// viewed at http://localhost:8080
app.get('/test', function(req, res) {
    res.sendFile(path.join(__dirname + '/index.html'));

});

Ive created this small FB.api call which return some data. Now I want to display this data when accessing localhost:8080/test, how do I do that? what is the way to do stuff like that? Can someone point me to some documentation of possible?

Answer 1

First you add your FB.api call inside an express route like this

app.get('/something', function(req, res) {
    FB.api('4', function (result) {
        if(!res || res.error) {
            return res.send(500, 'error');
        }

        res.send(result);
    });
});

Then inside index.html you can add some javascript to your page and create an XHR to call 'localhost:8080/something' like that

index.html

<script type="text/javascript">
    var xhr = new XMLHttpRequest();
    xhr.open('GET', 'http://localhost:8080/something');
    xhr.onreadystatechange = function() {
        if (xhr.readyState === 4) {
            var data = xhr.responseText;

            //Do whatever you want with this data.
        }
    }
    xhr.send();
</script>