Populating Datatables with JSON array from GET request

问题

I know that there has been many answers and tutorials about populating Jquery Datatables with data but I always get to the point of getting the following exception:

Uncaught TypeError: Cannot read property 'length' of undefined

I, being mainly a backend developer, have little to no experience with writing client so I would like to ask you about what I am doing wrong in the following example.

I have a server running locally exposing an endpoint /destination which responds with a JSON string in this format:

[{
    "id": 1,
    "name": "London Heathrow",
    "lat": 51.470022,
    "lon": -0.454295
}, {
    "id": 2,
    "name": "London Gatwick",
    "lat": 51.153662,
    "lon": -0.182063
}, {
    "id": 3,
    "name": "Brussels Airport",
    "lat": 50.900999,
    "lon": 4.485574
}, {
    "id": 4,
    "name": "Moscow Vnukovo",
    "lat": 55.601099,
    "lon": 37.266456
}]

I would like to display these data in a table using the Datatables plugin. This is the table code:

<table id="example" class="display" cellspacing="0" width="100%">
     <thead>
         <tr>
             <th>ID</th>
             <th>Name</th>
             <th>Lattitude</th>
             <th>Longitude</th>
         </tr>
        </thead>
 </table>

And script to populate it:

$(document).ready(function() {
    $('#example').DataTable({
        "processing" : true,
        "ajax" : {
            "url" : ".../destination",
            "type" : "GET"
        },
        "columns" : [ {
            "data" : "id"
        }, {
            "data" : "name"
        }, {
            "data" : "lat"
        }, {
            "data" : "lon"
        }]
    });
});

As specified above, I am getting the Uncaught TypeError: Cannot read property 'length' of undefined. Any help is appreciated.

EDIT: It works if I do a request for the data and then pass the data to the datatables as follows:

$.ajax({
            url : '/AOS-project/destination',
            type : 'GET',
            dataType : 'json',
            success : function(data) {
                assignToEventsColumns(data);
            }
        });

        function assignToEventsColumns(data) {
            var table = $('#example').dataTable({
                "bAutoWidth" : false,
                "aaData" : data,
                "columns" : [ {
                    "data" : "id"
                }, {
                    "data" : "name"
                }, {
                    "data" : "lat"
                }, {
                    "data" : "lon"
                } ]
            })
        }

I was expecting the datatables to have this functionality baked in...

回答1:

Set dataSrc to ''. As the documentation states :

Get JSON data from a file via Ajax, using dataSrc to read data from a plain array rather than an array in an object:

$(document).ready(function() {
    $('#example').DataTable({
        "processing" : true,
        "ajax" : {
            "url" : "https://api.myjson.com/bins/14t4g",
            dataSrc : ''
        },
        "columns" : [ {
            "data" : "id"
        }, {
            "data" : "name"
        }, {
            "data" : "lat"
        }, {
            "data" : "lon"
        }]
    });
});

and your code works -> http://jsfiddle.net/nzn5m6vL/

回答2:

If you code working with hard json than try it

$(document).ready(function() {
    $('#example').DataTable({
        processing : true,
        ajax: {
                url: "/api/venues",
                "type" : "GET"
                dataSrc: function (json) {
                    var obj = JSON.parse(json);
                    console.log(obj);
                    return obj;
                 }
            },
        columns : [ {
            data : "id"
        }, {
            data : "name"
        }, {
            data : "lat"
        }, {
            data : "lon"
        }]
    });
});

来源：https://stackoverflow.com/questions/33362593/populating-datatables-with-json-array-from-get-request

标签

javascript

jquery

json

datatables-1.10