Looping through a json array of objects

Question

I have been trying to follow an example as per another stackoverflow question:

javascript or jquery: Looping a multidimensional object

I am posting this question as a last resort as I have been on the problem for hours!

I have an ajax function that returns a json array.

ajax:

  $.ajax({ url: 'functions.php',
           data: {action: 'getNFCMapping', site: site_id},
           type: 'post',
           dataType: 'json',
           success: function(data) {
            //loop the json to get the
                for (var key in data) {
                      console.log(data[key].nfc_id);
                  }
            } //end success
  });//end ajax

json array:

[{"24":{"nfc_id":"1","description":"sdfgdsg"}},{"25":{"nfc_id":"2","description":"dfgdfgdfg"}},{"26":{"nfc_id":"3","description":"fdgdffg"}},{"27":{"nfc_id":"4","description":"dfgdfgdfg"}}]

What I am trying to do eventually is load a form in the DOM with input fields (pre-populated) in pairs of nfc_id and description, therefore each iteration of the loop should output the two values.

The problem at the moment is that I can't actually access the values in each iteration, e.g. you can see I am trying to log the nfc_id of each iteration but it just appears as object in the console.

In the example ( javascript or jquery: Looping a multidimensional object ), I can see the difference in format of my json, in that I have two closing brackets on each iteration of my array, is this what the issue is?

Please help this is driving me crazy..

scrowler · Accepted Answer · 2014-03-10 20:31:02Z

2

You want two nested .each() loops:

$.each(data, function(key, value) {
    $.each(value, function(k, v) {
       console.log(v.nfc_id); 
    });
});

Fiddle

answered Mar 10, 2014 at 20:31

scrowler

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2 Comments

anewvision Over a year ago

Excellent, worked. Thanks @scrowler. Will accept once time limit passes.

MonkeyZeus Over a year ago

Just wanted to throw some caution in here because $.each() exhibits an exponential difference in processing time as the amount of array/object elements increases. A million iterations of empty array items takes 1500% longer when using $.each(). Of course this is going to vary from one CPU to another so my old AMD dual-core is probably below average of modern CPUs. My Test

dfsq · Accepted Answer · 2014-03-10 20:31:54Z

1

You data is an array, so you should use for (var i = 0; i < data.length; i++) loop. Each element is an object so you use var key in obj notation:

for (var i = 0; i < data.length; i++) {
    for (var key in data[i]) {
        console.log(data[i][key].nfc_id);
    }
}

answered Mar 10, 2014 at 20:31

dfsq

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Comments

biddano · Accepted Answer · 2014-03-10 20:32:30Z

-1

Perhaps try the .each jQuery method? Link

So for your success:

success: function(data){
    $(data).each(function(index, element){
      //log here
    }
}

answered Mar 10, 2014 at 20:32

biddano

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Comments

Peter Bratton · Accepted Answer · 2014-03-10 20:51:15Z

-1

for(var i=0, i<data.length;i++)
$.each(data[i], function(key, val) {
    console.log(val.nfc_id);
    console.log(val.description);
});

edited Mar 10, 2014 at 20:51

Peter Bratton

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answered Mar 10, 2014 at 20:31

Shovan

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