Return a value from json data if two values are equal

Question

function getusername(userid) {
  $.get('/getRecentSignups', function (data) {

console.log(JSON.stringify(data);

//prints
{"_id":"5306e7fd80b1027ad2653db4","email":"priya@gmial.com","id":"27","password":"priya","signedtime":"2014-02-21 11:15:33"},{"_id":"5306e81880b1027ad2653db5","email":"anju@gmail.com","id":"35","password":"anju","signedtime":"2014-02-21 11:16:00"}]

// userid passing here is 35

    data = data.filter(function(val) {
       return (val.id === userid)
         });
  });
}

In the above function getusername() I am passing userid 35

Data prints //prints

    {
  "_id": "5306e7fd80b1027ad2653db4",
  "email": "priya@gmial.com",
  "id": "27",
  "password": "priya",
  "signedtime": "2014-02-21 11:15:33"
},
{
  "_id": "5306e81880b1027ad2653db5",
  "email": "anju@gmail.com",
  "id": "35",
  "password": "anju",
  "signedtime": "2014-02-21 11:16:00"
}]

I have to return corresponding email when userid equals data.id how it is possible?

well, password is being received as text. – hjpotter92 Feb 21 '14 at 10:43 — hjpotter92, Feb 21 '14 at 10:43

score 1 · Accepted Answer · edited May 23 '17 at 12:10

1

First, you can't return a value from the method as it is asynchronous, you need to use a callback pattern to solve this like

function getusername(userid, callback) {
    $.get('/getRecentSignups', function (data) {
        data = data.filter(function (val) {
            return (val.id == userid)
        });
        if (data && data.length) {
            callback(data[0].email);
        } else {
            callback(userid);
        }
    });
}
getusername(35, function (email) {
    //do something
})

See How to return the response from an AJAX call?

edited May 23 '17 at 12:10

Community

1
1

answered Feb 21 '14 at 10:45

Arun P Johny

384,651
66
527
531

@Sush share how you have used the method `getusername` – Arun P Johny Feb 21 '14 at 10:53
one thing also am doing when userid="guest" i have to return callback(userid) and if userid="35" i have to return callback(data[0].emai;) – Sush Feb 21 '14 at 11:04
`function getusername(userid, callback) { $.get('/getRecentSignups', function (data) { if (data.id === userid) { callback(data[0].email); } else { callback(userid); } }); }`and that call back eoor is not getting now – Sush Feb 21 '14 at 11:06
@Sush but you removed the filter logic why is that – Arun P Johny Feb 21 '14 at 11:11
@Sush your initial logic and the one posted above does not match – Arun P Johny Feb 21 '14 at 11:13
i think while using that filter it doent returns data when userid="guest" dats y i remove that – Sush Feb 21 '14 at 11:13
let us [continue this discussion in chat](http://chat.stackoverflow.com/rooms/48047/discussion-between-arun-p-johny-and-sush) – Arun P Johny Feb 21 '14 at 11:13

Return a value from json data if two values are equal

1 Answers1