Loop though json key to check if its value is empty

Question

I have this json object. Json key remarks and address is empty. If its empty then json prints undefine when extracting json. But i want replace empty json with - sign. I know I can use:

 if(msg.hasOwnProperty('remarks')== ""){
        alert("A");
   }

But how to loop through all the keys and check if its empty and replace with - rather than checking it individually.

[
{
    "id": "224",
    "booking_id": "1",
    "room_type": null,
    "no_of_rooms_booked": null,
    "check_in_date": "2014-12-23",
    "check_out_date": "2014-12-24",
    "room_id": "93",
    "hotel_id": "9",
    "status": "1",
    "user_id": "15",
    "payment_type": "",
    "payment_status": "",
    "hotelname": "sample hotel",
    "hoteladdress": "sample address",
    "hotelcontact": "056533977",
    "Id": "224",
    "full_name": "Hom Nath Bagale",
    "address": "",
    "occupation": "Student",
    "nationality": "Nepali",
    "contact_no": "9845214140",
    "email": "bhomnath@salyani.com.np",
    "remarks": "",
    "total_amount": "5000",
    "child": "0",
    "adult": "1",
    "verification_code": null,
    "roomname": "sample room2",
    "roomprice": "1.5",
    "roomdescription": "this is for demo",
    "roomimage": "2.jpg"
}]

see:: http://stackoverflow.com/questions/684672/loop-through-javascript-object — Sudhir Bastakoti, Feb 05 '15 at 06:59

score 6 · Accepted Answer · answered Feb 05 '15 at 06:58

6

Try this

data.forEach(function (el) {
  Object.keys(el).forEach(function (property) {
    if (el[property] === '') {
      el[property] = '-';
    }
  });
});

Example

Object.keys() - returns an array of a given object's own enumerable properties

answered Feb 05 '15 at 06:58

Oleksandr T.

76,493
17
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@Homnath Bagale as I see `remarks` there is in result – Oleksandr T. Feb 05 '15 at 07:08
@Homnath Bagale if you need check if property is undefined you can try this http://jsbin.com/bineku/2/edit?js,console – Oleksandr T. Feb 05 '15 at 08:23

singhakash · Answer 2 · 2015-02-05T07:07:55.627

3

Do

  var msg=
    {
        "id": "224",
        "booking_id": "1",
        "room_type": "",
        "roomimage": "2.jpg"
    };

 $.each(msg, function(k, v) {
         if(v===""){
           alert(k + ' is empty' + v);  
           //do actions
         }else{
            alert(k + ' is ' + v);
          }
    });

DEMO

edited Feb 05 '15 at 07:07

answered Feb 05 '15 at 06:59

singhakash

7,891
6
31
65

score 1 · Answer 3 · answered Feb 05 '15 at 06:59

You can use the for...in loop to iterate through each property like

for (var key in msg) {
    if (msg.hasOwnProperty(key)) {
        if (msg[key] === '') {
            msg[key] = '-'
        }
    }
}

Since you have used jQuery, you could also use the $.each() method like

$.each(array, function (i, msg) {
    $.each(msg, function (key, value) {
        if (value === '') {
            msg[key] = '-'
        }
    })
});

Hamzeen Hameem · Answer 4 · 2018-03-28T17:16:03.157

Below I have provided 2 functions, first of which can handle your entire json. The second is a much simpler one where you have to pass a specific element from your array (since you know the keys you look for are only available in the first element of the array).

Speciality of both these solutions is that they don't modify (mutate) the original json which you pass to them.

var sampleJson = [{
  "id": "224",
  "booking_id": "1",
  "remarks": "",
  "address": "",
}];

var newJson = getNonEmptyArry(sampleJson);
var newObj = getNonEmptyObj(sampleJson[0]);

console.log('newJson: ' + JSON.stringify(newJson));
console.log('newObj: ' + JSON.stringify(newObj));
console.log('Original Json ' + JSON.stringify(sampleJson));

function getNonEmptyArry(json) {
  var cpyJson = JSON.parse(JSON.stringify(json));
  cpyJson.forEach(obj => {
    Object.keys(obj).forEach(key => {
      if (obj[key] === '') {
        obj[key] = '-';
      }
    });
  });
  return cpyJson;
};

function getNonEmptyObj(obj) {
  var obj = JSON.parse(JSON.stringify(obj));
  Object.keys(obj).forEach(key => {
    if (obj[key] === '') {
      obj[key] = '-';
    }
  });
  return obj;
};

Loop though json key to check if its value is empty

4 Answers4