How to send array in a formdata in Flutter using Dio package?

Question

I want to send a File with a complex JSON object containing JSON Array. How can I do it?

I want to send this kind of FormData. Here is how I have implemented it:

final data = {
  "id": 60,
  "first_name": "Amit",
  "last_name": "Sharma",
  "email": "[email protected]",
  "phone_no": "1111111111",
  "addr": "Lko",
  "status": "VERIFIED",
  "total_funds": 0,
  "bankDetails": [
    {"name": "ASD", "acc": "123"},
    {"name": "ASDFG", "acc": "1234"}
  ]
};
if (file != null) {
  data['pic'] =
      MultipartFile.fromFileSync(file.path, filename: 'profile_image');
}
final formData = FormData.fromMap(data);

final formData = FormData.fromMap(data);

final res = await _dio
    .post(
      '$kBaseUrl$kUploadPlanterStory',
      options: Options(
        headers: headers,
        contentType: Headers.formUrlEncodedContentType,
      ),
      data: formData,
    )
    .catchError((e) => throw getFailure(e));

print(res);

}

Your question lacks information on what happened vs what you expected to happen (or in other words, what is the exact problem). Answering to such questions is a guesswork because the answer may address a problem unrelated to your issue. — mfkw1
– mfkw1, Commented Jan 15, 2021 at 12:36

Sunn · Accepted Answer · 2022-07-05 12:30:53Z

6

https://github.com/flutterchina/dio/issues/1155#issuecomment-842492719

Another method would be using the ListFormat.multiCompatible param in FormData.

And I believe this will work on nested arrays without changing the structure of your body, encoding or adding [] to the keys: e.g.

FormData.fromMap(data, ListFormat.multiCompatible); // <-- add this

edited Jul 5, 2022 at 12:30

answered Jul 5, 2022 at 12:24

Sunn

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Comments

mfkw1 · Accepted Answer · 2021-01-15 12:32:46Z

5

Currently you are using urlEncoded to encode whole data map, which isn't what you want. If you want to encode a specific part of request using a different serialization method, you have to do it manually:


final data = {
  // urlEncoded fields
  // ...
  "bankDetails": jsonEncode([
    {"name": "ASD", "acc": "123"},
  ]),
};

//...
data: FormData.fromMap(data)

answered Jan 15, 2021 at 12:32

mfkw1

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Comments

navdeep chokan · Accepted Answer · 2021-07-22 07:28:12Z

2

Remember to add "[]" after the key. Simplest Method to send array in form data :

FormData formData = new FormData.fromMap({
  "name": "Max",
  "location": "Paris",
  "age": 21,
  "image[]": [1,2,3],
});

Response response = await dio.post(
  //"/upload",
  "http://143.110.244.110/radius/frontuser/eventsubmitbutton",
  data: formData,
  onSendProgress: (received, total) {
    if (total != -1) {
      print((received / total * 100).toStringAsFixed(0) + '%');
    }
  },
);

answered Jul 22, 2021 at 7:28

navdeep chokan

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1 Comment

Mahmoud Eidarous Over a year ago

You just saved me after hours of search!!

rminaj · Accepted Answer · 2024-09-12 02:43:06Z

all the above are not right i will explain you how you can do it

  Future<void> postPropertyAPI(BuildContext context, String projectColonyName) async {
    var typeOfProperty = "";
    if(widget.type == AppStrings.plots){
      typeOfProperty = plotTypeProperty;
    }else if(widget.type == AppStrings.commercialSpace){
      typeOfProperty = commercialTypeProperty;
    }else if(widget.type == AppStrings.flatHouseVilla){
      typeOfProperty = flatHouseTypeProperty;
    }
    Loader.ProgressloadingDialog(context, true);
    try {
      const url = Urls.postPropertyUrl;
      var formData = FormData.fromMap({
        "user_id": userID,
        "calony_name": projectColonyName,
        "type_of_property": typeOfProperty,
        // "location[0]": location,
        "address": propertyAddressController.text,
        "width": widthController.text,
        "length": lengthController.text,
        "totalarea": totalAreaController.text,
        "facing": facing,
        "open_side": openSide,
        "transaction_type": transactionType,
        "possession_status": possessionStatus,
        "expected_price": expectedPriceController.text,
        "price_per_square": pricePerSqFtController.text,
        // "aminities": selectedAmenitiesList,
        "description_details": descriptionController.text,
        "buildup_area": superBuildupAreaController.text,
        "floor_no": totalNoOfFloorsController.text,
        "your_space_in_which_floor": floor,
        "furnished_status": furnished,
        "floor_no": noOfFloor,
        "flat_size": flatSize,
      });
      formData.fields.add(MapEntry("location[]", location));
      selectedAmenitiesList.forEach((amenity) {
        formData.fields.add(MapEntry("aminities[]", amenity));
      });
      final responseDio = await Dio().post(url,data: formData,);
      Loader.ProgressloadingDialog(context, false);
      if (responseDio.statusCode == 200) {
        print(url);

        Map<String, dynamic> map = (responseDio.data as Map).cast<String, dynamic>();
        PostPropertyModel response = PostPropertyModel.fromJson(map);

        Utilities().toast(response.message);
        if (response.status == true) {
          Navigator.of(context).pop();
          setState(() {});
        }
      }

    } catch (e) {
      Loader.ProgressloadingDialog(context, false);
      Utilities().toast('error: $e');
    }
    return;
  }

I want to send location and aminities in array format so dont need any changes in anywhere just do it like:

formData.fields.add(MapEntry("location[]", location));
selectedAmenitiesList.forEach((amenity) {
    formData.fields.add(MapEntry("aminities[]", amenity));
});
  
for example selectedAmenitiesList is List<String> selectedAmenitiesList = ["one", "two", "three", "four"] 
// so all are string and MapEntry() is exept only string as a socond args so one more thing you can do like 
formData.fields.add(MapEntry("aminities[]", amenity.toString()));

Divyanshu Bisht · Accepted Answer · 2022-01-07 07:35:22Z

0

final dio = Dio();
dio.options.headers = {
  'Accept': 'application/json',
  'Content-Type': 'multipart/form-data',      
  };

FormData formData = new FormData();
formData = FormData.fromMap({
"[bankDetails][]": [ {"name": "ASD", "acc": "123"},
{"name": "ASDFG", "acc": "1234"} ] });
final responseJson = await dio.post(
    
    url,
    data: formData,
  );

answered Jan 7, 2022 at 7:35

Divyanshu Bisht

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