issue on identifying getjson response value

Question

I have a getjson which logs successfully if I give correct data.value, if I give invalid data.value it shows an empty array[] on browser, how can I identify json returns an empty array [] using my getjson code, I have tried below code but not work, if I give invalid data.value. Need your help.

$.getJSON("http://xxx.xx.xx/mobapp/api/get-pli-details?id=" + data.value, function (result) {
    console.log('here ' + result[0].email);
    if (result[0] === null) {
        popup("<h3>M-Elec</h3>Invalid PLI ID");
    } else {
        email = result[0].email;
        userType = result[0].utype;
        name = result[0].name;
    }
});

You mean `if (result.length > 0)`? `result[0]=== null` doesn't work because if the array is empty `result[0]` is `undefined`. — Felix Kling, Dec 19 '13 at 05:03
possible duplicate of [Testing for an empty array in JavaScript Performance](http://stackoverflow.com/questions/17509019/testing-for-an-empty-array-in-javascript-performance) — Felix Kling, Dec 19 '13 at 05:05
Have you put in break points in your code. That will give you a better idea. — Talha Masood, Dec 19 '13 at 05:11

score 0 · Accepted Answer · answered Dec 19 '13 at 05:03

0

Try this

$.getJSON(url,function(result){
    if ( result.length == 0 ) {
        console.log("NO DATA!")
    }
});

answered Dec 19 '13 at 05:03

Sridhar R

19,414
6
36
35

@mvp: If you just say "not works", then we cannot help you further. [Learn how to **debug** JavaScript](http://www.creativebloq.com/javascript/javascript-debugging-beginners-3122820) to help yourself. – Felix Kling Dec 19 '13 at 05:06
@mvp so your url did not return anything right.so use success and failure promise callbacks – Sridhar R Dec 19 '13 at 05:17

score 0 · Answer 2 · edited May 23 '17 at 12:19

0

Refer below links,

edited May 23 '17 at 12:19

Community

1
1

answered Dec 19 '13 at 05:09

Vijayakumar Selvaraj

525
4
16

issue on identifying getjson response value

2 Answers2