[jquery] jQuery loop over JSON result from AJAX Success?

On the jQuery AJAX success callback I want to loop over the results of the object. This is an example of how the response looks in Firebug.

[
 {"TEST1":45,"TEST2":23,"TEST3":"DATA1"},
 {"TEST1":46,"TEST2":24,"TEST3":"DATA2"},
 {"TEST1":47,"TEST2":25,"TEST3":"DATA3"}
]

How can I loop over the results so that I would have access to each of the elements? I have tried something like below but this does not seem to be working.

jQuery.each(data, function(index, itemData) {
  // itemData.TEST1
  // itemData.TEST2
  // itemData.TEST3
});

if you don't want alert, that is u want html, then do this

...
    $.each(data, function(index) {
        $("#pr_result").append(data[index].dbcolumn);
    });
...

NOTE: use "append" not "html" else the last result is what you will be seeing on your html view

then your html code should look like this

...
<div id="pr_result"></div>
...

You can also style (add class) the div in the jquery before it renders as html

Access the json array like you would any other array.

for(var i =0;i < itemData.length-1;i++)
{
  var item = itemData[i];
  alert(item.Test1 + item.Test2 + item.Test3);
}

You can also use the getJSON function:

    $.getJSON('/your/script.php', function(data) {
        $.each(data, function(index) {
            alert(data[index].TEST1);
            alert(data[index].TEST2);
        });
    });

This is really just a rewording of ifesdjeen's answer, but I thought it might be helpful to people.

I use .map for foreach. For example

success: function(data) {
  let dataItems = JSON.parse(data)
  dataItems = dataItems.map((item) => {
    return $(`<article>
                <h2>${item.post_title}</h2>
                <p>${item.post_excerpt}</p>
              </article>`)
  })
},

I am partial to ES2015 arrow function for finding values in an array

const result = data.find(x=> x.TEST1 === '46');

Checkout Array.prototype.find() HERE

This is what I came up with to easily view all data values:

var dataItems = "";_x000D_
$.each(data, function (index, itemData) {_x000D_
    dataItems += index + ": " + itemData + "\n";_x000D_
});_x000D_
console.log(dataItems);

$each will work.. Another option is jQuery Ajax Callback for array result

function displayResultForLog(result) {
  if (result.hasOwnProperty("d")) {
    result = result.d
  }

  if (result !== undefined && result != null) {
    if (result.hasOwnProperty('length')) {
      if (result.length >= 1) {
        for (i = 0; i < result.length; i++) {
          var sentDate = result[i];
        }
      } else {
        $(requiredTable).append('Length is 0');
      }
    } else {
      $(requiredTable).append('Length is not available.');
    }

  } else {
    $(requiredTable).append('Result is null.');
  }
}

Try jQuery.map function, works pretty well with maps.

var mapArray = {_x000D_
  "lastName": "Last Name cannot be null!",_x000D_
  "email": "Email cannot be null!",_x000D_
  "firstName": "First Name cannot be null!"_x000D_
};_x000D_
_x000D_
$.map(mapArray, function(val, key) {_x000D_
  alert("Value is :" + val);_x000D_
  alert("key is :" + key);_x000D_
});

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

If you are using the short method of JQuery ajax call function as shown below, the returned data needs to be interpreted as a json object for you to be able to loop through.

$.get('url', function(data, statusText, xheader){
 // your code within the success callback
  var data = $.parseJSON(data);
  $.each(data, function(i){
         console.log(data[i]);
      })
})

If you use Fire Fox, just open up a console (use F12 key) and try out this:

var a = [
 {"TEST1":45,"TEST2":23,"TEST3":"DATA1"},
 {"TEST1":46,"TEST2":24,"TEST3":"DATA2"},
 {"TEST1":47,"TEST2":25,"TEST3":"DATA3"}
];

$.each (a, function (bb) {
    console.log (bb);
    console.log (a[bb]);
    console.log (a[bb].TEST1);
});

hope it helps

For anyone else stuck with this, it's probably not working because the ajax call is interpreting your returned data as text - i.e. it's not yet a JSON object.

You can convert it to a JSON object by manually using the parseJSON command or simply adding the dataType: 'json' property to your ajax call. e.g.

jQuery.ajax({
    type: 'POST',
    url: '<?php echo admin_url('admin-ajax.php'); ?>',
    data: data, 
    dataType: 'json', // ** ensure you add this line **
    success: function(data) {
        jQuery.each(data, function(index, item) {
            //now you can access properties using dot notation
        });
    },
    error: function(XMLHttpRequest, textStatus, errorThrown) {
        alert("some error");
    }
});