CODEWITHSUNDEEP
node.jsmeteor
Orbit
Orbit

Reputation: 2395

Returned method call is undefined?

Ok so i am using a method to make a request and pull some tables from another URL

Meteor.methods({
    gimmetitle: function () {

        var url = 'http://wiki.warthunder.com/index.php?title=B-17G_Flying_Fortress';

        request(url, function(err, response, body) {
            $ = cheerio.load(body);
            var text = $('.flight-parameters td').text();
            console.log(text);

            return text;
        });          
    }
});

When called the td's in the table succesfully print to the server console: http://prntscr.com/721pjh

Buuut, when that text is returned from that method to this client code, undefined is printed to the console:

Template.title.events({
    'click #thebutton': function () {
         Meteor.call('gimmetitle',  function(error, result){
            Session.set('gogle', result);
        });

         var avar = Session.get('gogle');
         console.log(avar);
    }
});

Ideas?

Upvotes: 1

Views: 112

Answers (2)

Orbit
Orbit

Reputation: 2395

Quick update..Was able to fix this with just 1 line of code lol.

instead of request(url, function(err, response, body) i used the froatsnook:request package and used var result = request.getSync(url, {encoding: null}); and then just replaced $ = cheerio.load(body); with $ = cheerio.load(result.body);.

Upvotes: 0

saimeunt
saimeunt

Reputation: 22696

You need to understand two different things here :

  • On the client side, making some calls to the server is always asynchronous, because we have to deal with network latency. That's why we use callbacks to fetch the result of Meteor methods : this code is executed some time in the future, not right away.

This is why Session.set('gogle', result); is actually executed AFTER var avar = Session.get('gogle'); even though it appears before in your event handler code flow.

  • Contrary to template helpers, event handlers are NOT reactive, so it means that when you set the Session variable to the result of the method, the event handler code is not automatically reexecuted with the new value of Session.get('gogle').

You'll need to either do something with the result right in the Meteor method callback, or use a reactive computation (template helpers or Tracker.autorun) depending on Session.get('gogle') to rerun whenever the reactive data source is modified, and use the new value fetched from the server and assigned to the Session variable.

Upvotes: 1

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