Check if JSON object is empty

Question

I want to check if an object has any data in it inside of cities, so basically it would show true for data for this:

JSON

{"cities":[{"id":0,"client_id":"1","storename":"test","notes":"test","rejected":"on","offer":"test","time":1394457477525}]}

and false for this:

{"cities":[]}

Currently my code is incorrect as its not checking inside of cities just if its empty or not, is there any way I can adapt my code for it to work?

JavaScript

 if (jQuery.isEmptyObject(JsonData) == false) {
      $('#upload').show();
      alert("There is data");
 } else {
      $('#upload').hide();  
      alert("There is no data");
 }

It's an array, so just check for length

adeneo
– adeneo

2014-03-10 13:27:25 +00:00
Commented Mar 10, 2014 at 13:27 — adeneo
– adeneo, Commented Mar 10, 2014 at 13:27

Fabrizio Calderan · Accepted Answer · 2018-02-16 13:44:35Z

5

Assuming JsonData is a valid JSON

if (JsonData.cities.length > 0) {
   alert("there is data");  
}
else {
   alert("there is no data"); 
}

if JsonData is a string you need instead to parse it before as a JSON structure, using JSON.parse(JsonData) : see MDN for further reference

Note: If you're not sure to always have JsonData or JsonData.cities available, you may create a fence for properties lookup (as suggested on ajaxian) in this way

if (((JsonData || 0).cities || 0).length > 0) {
   alert("there is data");  
}
else {
   alert("there is no data"); 
}

edited Feb 16, 2018 at 13:44

answered Mar 10, 2014 at 13:27

Fabrizio Calderan

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6 Comments

Fabrizio Calderan Over a year ago

if you store your json in a JsonData variable, then JsonData.cities is the array

Fabrizio Calderan Over a year ago

you have a start?centre=1: 103 at the end of your json. this makes the whole json invalid (paste and copy your structure on jsonlint.com)

Fabrizio Calderan Over a year ago

then I think you need to provide a fiddle that reproduces the error. I can't imagine what else is going wrong here

Brent Over a year ago

{"cities":[{"id":0,"client_id":"1","storename":"test","notes":"test","rejected":"on","offer":"test","time":1394458602054},{"id":1,"client_id":"1","storename":"","notes":"","rejected":"on","offer":"","time":1394458606774}]} This was logged when i did console.log(JsonData); and it said there was no data .

Fabrizio Calderan Over a year ago

could you try to console.log(typeof JsonData)?

|

Ritesh Chandora · Accepted Answer · 2014-03-10 13:29:06Z

0

check for cities.length its an array.

answered Mar 10, 2014 at 13:29

Ritesh Chandora

8,7005 gold badges24 silver badges39 bronze badges

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