CODEWITHSUNDEEP
javascriptjson
batman191
batman191

Reputation: 57

Parsing JSON data and checking if array is empty

I'm trying to get an array from a JSON object, and check if it's empty, but it's giving me problems. HTML:

<p id="r"></p>

JS:

var r = document.getElementById('r');

var obj = {
    "_id": "4345356",
    "title": "sdfsf",
    "data": []
};

obj = JSON.parse(obj);

function isEmpty(a) {
    if (typeof a === 'undefined' || a.length == 0)
        return true;

    return false;
}

r.innerHTML = isEmpty(obj.data);

Fiddle. What did I miss? Thanks!

Upvotes: 0

Views: 2674

Answers (3)

Igwe Kalu
Igwe Kalu

Reputation: 14868

As others have suggested, it appears you don't have a need what whatsoever for

obj = JSON.parse(obj);

Finally to check emptiness of an array is easy, in your case, do this:

r.innerHTML = !obj.data.length;

or

r.innerHTML = obj.data.length === 0;

But if you really have a need to define a function for this purpose, then the following should be enough:

function isEmpty(a) {
    return a && !a.length;
}

Upvotes: 1

Ruchir Gupta
Ruchir Gupta

Reputation: 1000

You don't need this line: obj = JSON.parse(obj); I have updated the fiddle.

Upvotes: 0

Mritunjay
Mritunjay

Reputation: 25882

You don't have to parse the obj. It's already an object.

remove this line

obj = JSON.parse(obj);

Upvotes: 3

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