Getting ajax request response node.js

Question

I have a html page that triggers an ajax request:

$.ajax({
                type: 'POST',
                url: '/usernamecheck',
                data: {"username":username},
                success: function(taken){
                    if(taken === 0){
                        $('#error').text('The username' + username + ' is available!')
                    }else{
                        $('#error').text('The username' + username + ' is not available')
                    }
                },
                dataType: "json"
            })

this is my node.js code:

exports.usernameCheck = function(req,res){
var db;
db = require('./../custom_modules/db.js');
var username = req.body.username;
db.users.find({username:username},function(err,users){

    console.log(username)
    if(users.length === 0){
        //return 0
    }else{
        //return1
    }
})

and I want to respond to this ajax with node.js request but am a little unsure of how to do so?

Well the first thing you'd have to do is have a web server written and have it respond to the post request to /usernamecheck. Have you written anything for node yet? I don't think your question is specific enough to really give a good answer. — travis
– travis, Commented Aug 8, 2012 at 20:49
What your AJAX is doing is just making a normal HTTP request via Javascript. If you have a web server set up, you just respond as you would if someone entered the URL into their browser (albeit with json or something). — jli
– jli, Commented Aug 8, 2012 at 21:02
@jli could you give me an example of code to do this? I use express and render html pages using res.render() what is the equivelent for sending JSON? — gilbertbw
– gilbertbw, Commented Aug 8, 2012 at 21:08
res.send() can take objects and will JSON.stringify them, too, now. — rdrey
– rdrey, Commented Aug 8, 2012 at 22:36

travis · Accepted Answer · 2012-08-08 23:27:30Z

3

The jQuery ajax dataType represents the data your're expecting back from the server. I would leave this as json and just change other parts of your code to accommodate the data type.

Client

$.ajax({
  type: 'POST',
  url: '/usernamecheck',
  data: {"username":username},
  success: function(response){
    if( response.taken === true){
      $('#error').text('The username' + username + ' is available!')
    }else{
      $('#error').text('The username' + username + ' is not available')
    }
  },
  dataType: "json"
})

Node

db.users.find({username:username},function(err,users){
  res.json({taken: users.length !== 0})
})

edited Aug 8, 2012 at 23:27

answered Aug 8, 2012 at 21:09

travis

8,6551 gold badge19 silver badges19 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

jli Over a year ago

Although since he's now mentioned he's using express: res.json() rather than res.write(JSON.stringify()). Also, could do taken: users.length !== 0 to cut out that branching.

Collectives™ on Stack Overflow

Getting ajax request response node.js

1 Answer 1

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related