how to get particular value from json array?

Question

I have the json array name like as newarr.How to get the all id's from the json array and how to add with in the arr value?

 var arr=new Array();
 var newarr=new Array([
        {
            "id": 16820,
            "value": "abcd",
            "info": "Centre"
        },
        {
            "id": 18920,
            "value": "abcd-16820",
            "info": "Centre"
        },
        {
            "id": 1744,
            "value": "abcd-16820",
            "info": "Centre"
        },
        {
            "id": 16822,
            "value": "AaronsburgPA-16820",
            "info": "Centre"
        }
    ]);

codebox · Accepted Answer · 2012-09-11 12:02:30Z

2

This should do it:

for (var o in newarr){
    arr.push(newarr[o].id);
}

also, you don't need to use both square brackets and new Array when building an array object, one of the other will do:

var myarray = new Array(1,2,3);

or

var myarray = [1,2,3];

answered Sep 11, 2012 at 12:02

codebox

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Comments

Robert Wilson · Accepted Answer · 2012-09-11 12:18:35Z

1

I tried this with jQuery and here is the fiddle for it.

$.each(newarr[0], function(k, v) {
    arr.push(v.id);
});
console.log(arr);

answered Sep 11, 2012 at 12:18

Robert Wilson

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1 Comment

sdepold Over a year ago

jquery... lame ;) i still don't see why one wouldn't use map for that :-/

Elliot Bonneville · Accepted Answer · 2012-09-11 12:01:52Z

0

It's very simple:

for(prop in newArr) {
    arr.push(newArr[prop].id);
}

Allow me to suggest that instead of coming directly to Stack Overflow for help, you Google around a bit next time. :) Also, that is not a JSON array: it's a Javascript array. And it's better to initialize an array with [] notation (var arr = []).

answered Sep 11, 2012 at 12:01

Elliot Bonneville

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Comments

KooiInc · Accepted Answer · 2012-09-11 12:09:47Z

0

Both given answers won't work, because you are creating a nested array (newarr=new Array([...])).

The algorithm is: loop through the Array containing objects, and push the value of every object.id to arr.

In you case:

for (var i=0;i<newarr[0].length;i+=1){
  if (newarr[0][i].id) {
    arr.push(newarr[0][i].id);
}

furthermore: this is not a 'JSON Array'. There are no such things as JSON Objects/Arrays

answered Sep 11, 2012 at 12:09

KooiInc

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sdepold · Accepted Answer · 2012-09-11 12:15:30Z

0

You can use the map method on array:

arr = newarr.map(function(obj) { return obj.id })

And a link to the documentation: https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/Array/map

If you don't have an id in every object, you might want to filter null:

arr = newarr.map(function(obj) {  
  return obj.id  
}).filter(function(id){  
  return id !== undefined  
})

Documentation: https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/Array/filter

and if you really have a nested array, do this first:

newarr = newarr[0]

and here is a link to jsfiddle

edited Sep 11, 2012 at 12:15

answered Sep 11, 2012 at 12:10

sdepold

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