Question

I’m fresh to this whole JSON and JQuery thing, and I’m trying to read a JSON structure coming from Delphi datasnap, e.g :

{"result":[[{"type":"VOMesas.TMesas","id":1,"fields":{ "FUsers":1,"FEnclosing":0,"FClientName":"","FCode":100,"FStatus":1,"FTotalValue":128.25}}]]}

How can I read it with JQuery, more especifically the Fields:{…} content ?

EDIT :

here is the function im trying to do

 function getContent(order) {
       $.getJSON("query.json",
    function(data) {
        $.each(data.result, function(i, item) {

        var grid = '<table border="1">';

        for (var i=0; i < item.length; i++){
            CAMPO = item[i];

            ...

Answer 1

If you’re loading the data via jQuery.ajax or similar and it’s being returned with the correct MIME type (or you tell jQuery.ajax that what you’re getting back is JSON), then what you receive in the success callback will be a deserialized object (no longer JSON, but the objects that the JSON described). That being the case, you just access the properties of the object, e.g.:

$.ajax({
    // ...
    success: function(data) {
        var fields = data.result[0][0].fields;
    }
});

data being the variable pointing to the object, which has a result property that’s an array with only one entry (so, entry [0]), which is itself another array with exactly one entry (so, entry [0] again), which is an object with a property called fields. Pictorially:

{                                        // <== data
    "result": [                          // <== data.result
        [                                // <== data.result[0]
            {                            // <== data.result[0][0]
                "type": "VOMesas.TMesas",
                "id": 1,
                "fields": {              // <== data.result[0][0].fields
                    "FUsers": 1,
                    "FEnclosing": 0,
                    "FClientName": "",
                    "FCode": 100,
                    "FStatus": 1,
                    "FTotalValue": 128.25
                }
            }
        ]
    ]
}

If you’re retrieving the data some other way and it’s still a string, you can deserialize it using jQuery.parseJSON:

var data = $.parseJSON(str);

…and then do the above to access fields.