How to read the Fields:{} content inside a JSON re

问题:

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];

            ...

回答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.

回答2:

If you've got a string of JSON, simply use JSON.parse to turn it into a Javascript object.

var datasnap = '{"result":[[{"type":"VOMesas.TMesas","id":1,"fields": FUsers":1,"FEnclosing:0,"FClientName":"","FCode":100,"FStatus":1,"FTotalValue":128.25}}]]}';
var data = JSON.parse(datasnap);
var fields = data['result'][0]['fields'];

By aware, however, that the JSON you've pasted into your question is invalid:

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

回答3:

First: Let's assume you assigned your JSON object to a variable "myobject". Then you can do

var myfields = myobject.result[0][0].fields;

回答4:

Hope this code example will help you to understand the jQuery/JSON thing.

I have taken the sample JSON object as an array. Then populating small HTML by reading key/value pair of JSON.

working example: http://jsfiddle.net/ylokesh/WC84k/