Access JSONArrays in javascript

Question

I am new to JavaScript. I have done similar requirements in Java using org.json library.

I have a String:

var string = "{\"id\" :[\"\"],\"State\" :[\"TX\",\"IA\"]}";

I am converting that string to a JSONObject using this:

var obj = JSON.parse(string);

I am trying to achieve this using JavaScript or jQuery. How do i get the JSONArrays inside this JSONObject. Please help me. Thanks in advance.

Hi Rayon. But i am trying to achieve this using javascript only. Do you still think i need to add java tag? Please let me know i will add if it helps. — user7637864, Mar 16 '17 at 04:52
I read it wrong. You have already achieved it using `JSON.parse`, what is left to be achieved ? — Rayon, Mar 16 '17 at 04:54
you just do `obj.id` and you've got the array. Or `obj.id.length` for the length of it (should be 1 here) — Ivan, Mar 16 '17 at 04:55
FYI, [There's no such thing as a "JSON Object"](http://benalman.com/news/2010/03/theres-no-such-thing-as-a-json/) — Phil, Mar 16 '17 at 05:02
@Ivan but the length gives me 1 for obj.id.length. I dont know why. Any one please help me. — user7637864, Mar 16 '17 at 05:15
@user7637864 that's because your `id` array contains one item; an empty string — Phil, Mar 16 '17 at 05:17
Can you please let me know how to get rid of that Empty String. I have tried (obj.id.isEmpty()) check . But its not working. @Phil — user7637864, Mar 16 '17 at 05:19

score 2 · Accepted Answer · answered Mar 16 '17 at 05:11

2

var jsonStr = "{\"id\" :[\"\"],\"State\" :[\"TX\",\"IA\"]}";
var jsonObj = JSON.parse(jsonStr);

idArr=jsonObj.id;
stateArr=jsonObj.State;

idArr.forEach(function(id) {
    console.log(id);
});
stateArr.forEach(function(state) {
    console.log(state);
})

hope this will help you

answered Mar 16 '17 at 05:11

Jackson Baby

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but the idArr.length is giving me 1. That should not be the case right? – user7637864 Mar 16 '17 at 05:16
2

idArr is a String array and it contains one empty String in its 0th index, That is why idArr.length is 1 – Jackson Baby Mar 16 '17 at 05:18
Can you please let me know how to get rid of that Empty String. I have tried (obj.id.isEmpty()) check . But its not working. @Jackson Baby – user7637864 Mar 16 '17 at 05:20
http://stackoverflow.com/questions/281264/remove-empty-elements-from-an-array-in-javascript – Jackson Baby Mar 16 '17 at 05:24
Use filter http://stackoverflow.com/questions/19888689/remove-empty-strings-from-array-while-keeping-record-without-loop/19888749#19888749 – Abhay Mar 16 '17 at 05:27

score 1 · Answer 2 · edited Mar 31 '17 at 04:44

1

You can try this with jquery Mention jquery as :

<script src="//ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

Code or script

var obj = $.parseJSON( '{\"id\" :[\"dddd\"],\"State\" :[\"TX\",\"IA\"]}' );
console.log(obj.id);

edited Mar 31 '17 at 04:44

Isaac

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answered Mar 16 '17 at 05:12

Arjun Prajapati

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Thanks for your response @arjun. – user7637864 Mar 16 '17 at 05:22

score 0 · Answer 3 · answered Mar 16 '17 at 05:05

So once you have got the object, you have to get the array field on which you want to perform iteration. For Ex if you want to iterate over State, Check below:

for (var i=0;i<obj.State.length;i++)
                        {
                            obj.State[i] ;
                        }

Is this what you were looking for? If not, then pls be more clear.

Access JSONArrays in javascript

3 Answers3