Retrieving JSON array in Javascript from PHP

Question

I am attempting to return a json encoded array to JS from PHP and i've done so many times before but now i'm getting a weird error. I am successfully getting the data and it's displaying the array in chrome. However, I cannot get it to enter the AJAX success function if I specify the dataType: 'json'. If I remove the dataType and use var parsed = JSON.parse(data); it will enter the success function but it will throw an unexpected type error. Please help.

Chrome output:

[
    {
        "fullURL": "https://lh6.googleusercontent.com/--ZKG_L-SA9c/UgqECNqP4II/AAAAAAAAA2I/i5nCa3CvKqM/s912/2010raptor_firstdrive002_opt.jpg",
        "thumbURL": "https://lh6.googleusercontent.com/--ZKG_L-SA9c/UgqECNqP4II/AAAAAAAAA2I/i5nCa3CvKqM/s128-c/2010raptor_firstdrive002_opt.jpg",
        "location": "",
        "caption": "",
        "tags": "",
        "program_instance_id": "a0Ji0000001pPO6EAM"
    },
    {
        "fullURL": "https://lh3.googleusercontent.com/-kyUg7_Rul90/UgqEDIu4DhI/AAAAAAAAA2Q/WF0BAEI7smo/s912/220px-Microchip_PIC24HJ32GP202.jpg",
        "thumbURL": "https://lh3.googleusercontent.com/-kyUg7_Rul90/UgqEDIu4DhI/AAAAAAAAA2Q/WF0BAEI7smo/s128-c/220px-Microchip_PIC24HJ32GP202.jpg",
        "location": "",
        "caption": "",
        "tags": "",
        "program_instance_id": "a0Ji0000001pPO6EAM"
    }
]

PHP

$arr = array();
foreach($photoURLS as $photo)
{
$arr[] = $photo;
}

}
echo json_encode($arr);

JS

$.ajax
({
    async: "false",
    type: 'POST',
    data: {action: 'var1', albumName: 'var2'},
    dataType: 'json',
    url: '/controller/function',
        success: function(data) 
        {
        //alert($.isArray(data));
        $.each(parsed, function(i, index) {
        alert(index.fullURL);
        });
        }
 });

This would somehow suggest that the response you get is not valid JSON. However, what you posted is valid. Are you echoing anything else in your PHP script? — Felix Kling
– Felix Kling, Commented Aug 20, 2013 at 21:45
Why do you need to loop the urls and push them to another array? Can't you just echo json_encode($photoURLS)? — elclanrs
– elclanrs, Commented Aug 20, 2013 at 21:45
If you remove the dataType attribute, jQuery will automatically guess the data type, so perhaps you won't need to JSON.parse the result. — benestar
– benestar, Commented Aug 20, 2013 at 21:46
@Felix yes there are other echo's in the controller, but only 1 echo in that function which is the json_encode($arr); — Undermine2k
– Undermine2k, Commented Aug 20, 2013 at 21:47
Sometimes I run into these types of problems,on the PHP side I'll call ob_clean(); echo json_encode($arr); exit(); to make sure I'm not sending anything "extra." Might be worth a shot. — Divey
– Divey, Commented Aug 20, 2013 at 21:50

User128848244 · Accepted Answer · 2013-08-20 22:23:39Z

So I worked the code back and think this solution might work for you.

$.ajax({
  async: "false",
  type: 'POST',
  data: {
    action: 'var1',
    albumName: 'var2'
  },
  dataType: 'json',
  url: '/controller/function',
  success: function(data) {
    $.each(data, function(index, element) {
      console.log(index);
      console.log(element.fullURL);
      console.log(element);
    });
  }
});

I can't test the ajax event however I have tested out the json you provided with the each loop and it seams to work. LINK TO FIDDLE

var data = [{
    "caption": "",
        "fullURL": "https://lh6.googleusercontent.com/--ZKG_L-SA9c/UgqECNqP4II/AAAAAAAAA2I/i5nCa3CvKqM/s912/2010raptor_firstdrive002_opt.jpg",
        "location": "",
        "program_instance_id": "a0Ji0000001pPO6EAM",
        "tags": "",
        "thumbURL": "https://lh6.googleusercontent.com/--ZKG_L-SA9c/UgqECNqP4II/AAAAAAAAA2I/i5nCa3CvKqM/s128-c/2010raptor_firstdrive002_opt.jpg"
}, {
    "caption": "",
        "fullURL": "https://lh3.googleusercontent.com/-kyUg7_Rul90/UgqEDIu4DhI/AAAAAAAAA2Q/WF0BAEI7smo/s912/220px-Microchip_PIC24HJ32GP202.jpg",
        "location": "",
        "program_instance_id": "a0Ji0000001pPO6EAM",
        "tags": "",
        "thumbURL": "https://lh3.googleusercontent.com/-kyUg7_Rul90/UgqEDIu4DhI/AAAAAAAAA2Q/WF0BAEI7smo/s128-c/220px-Microchip_PIC24HJ32GP202.jpg"
}];

$.each(data, function (index, element) {
    console.log(index);
    console.log(element.fullURL);
});

also good news is that your json is 100% valid so what is being passed back seams correct. Hope this helps

Community · Accepted Answer · 2017-05-23 10:31:54Z

0

Maybe you need to send the correct HTTP header with your response. See here: https://stackoverflow.com/questions/267546/correct-http-header-for-json-file

edited May 23, 2017 at 10:31

CommunityBot

11 silver badge

answered Aug 20, 2013 at 21:48

Lord Midi

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Comments

Raphael Kingazi · Accepted Answer · 2013-08-20 22:11:52Z

0

The variable parsed at your $.each function is not defined. you should use data instead of parsed as data is the variable at your success callback function.

$.each(data, function(i, index) {
    alert(index.fullURL);
    });

answered Aug 20, 2013 at 22:11

Raphael Kingazi

322 bronze badges

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