如何通过ajax使用普通JavaScript将多张照片上传到Laravel应用程序？

Question

<form action="" method="POST" enctype="multipart/form-data">
            @csrf
                <label for="photos">Photos:</label>
                <input type="file" name="photos[]" id="photos" class="form-control" multiple>


                <button class="btn btn-success mt-3" onclick="ajaxify(event)">Submit</button>
            </div>
        </form>

function ajaxify(event) {
            event.preventDefault();
            let failedValidation = false;

           // I removed parts of the code where I load other dataand do validation, irrelevant to the question.

            let photos = [];


            if(document.getElementById('photos').value !== '') {
                photos = document.getElementById('photos');   // I know this is incorrect, but I don't know what to do here.
            }

           // Here photos.value return something like c://fake/filename
           // And it doesn't return more than 1 file even, so anyway I am definitely doing this wrong.


            if(! failedValidation) {
                axios.post('/listing/create', {
                    client_name: name.value,
                    client_phone_number: client_phone_number.value,
                    category: category.value,
                    type: type.value,
                    governorate: governorate.value,
                    city: city.value,
                    space: space.value,
                    price: price.value,
                    furnished_status: furnished_status.value,
                    payment_type: payment_type.value,
                    initial_deposit: initial_deposit.value,
                    monthly_amount: monthly_amount.value,
                    notes: notes.value,
                    photos: photos.value, // So this should be an array of uploaded files.
                })
                .then((resp) => {
                    invalid.classList.add('d-none');
                    console.log(resp);
                })
            }
        }

一个简短的说明，我正在使用Laravel媒体库包，如果这有什么不同的话。

到目前为止，我所做的是研究这个问题，我读到我需要使用FormData()，我以前从未使用过它，我有几个问题，我需要将所有数据放在FormData()对象中并将其提供给Axios吗？还是我只需要它拍照片？我还没有尝试做这两件事中的任何一件，任何指导都将非常感谢。

Answer 1

您只能获得一个文件，因为所有文件对象都存储在files属性中的数组中。只需将它们追加到photos数组。

function ajaxify(event) {
  event.preventDefault();

  // use files attribute to get an array of the files
  var photoFiles = document.getElementById("photos").files;

  // using the array of files, create an array 'photos' of FormData objects
  let photos = [];
  for (let photo of photoFiles) {
    photos.push(new FormData(photo);
  }

  // turn your 'photos' array into a javascript object
  let photos = arr2obj(photoFiles);

  // this should fix the empty array problem you were having
  // pass 'photos' to the ajax data

  // ....
}

编辑：根据这篇文章，使用AJAX上传文件需要一个FormData对象，正如其中一位评论者指出的那样。数组必须是FormData对象数组。

编辑：通过JSON发送数组很麻烦。将数组转换为对象。您可以使用类似这样的简单函数从数组中构建一个对象。

function arr2obj(arr) {
  var obj = {};
  for (let i=0; i<arr.length; i++) {
    obj['photo'+i] = arr[i];
  }
  return obj;
}