如何从 Angular 前端上传 Excel 文件 (.xlxs) 到 Laravel API？

Question

My process starts in this HTML form:

<form [formGroup]="fileForm" enctype="multipart/form-data">
  <input
    type="file"
    accept=".xlsx"
    formControlName="file"
    (change)="onFileChange($event.target.files)"
  />
</form>

When a file is selected, onFileChange() is called, which does the following:

public onFileChange(files: FileList): void {
  if (files.length) {
    this.file = files[0];
  }
}

Once the file is set, the user clicks the upload button:

public onUploadClick(): void {
  if (this.file) {
    this.fileService.uploadFile(this.file).subscribe();
  }
}

My fileService then handles sending the http request to the API:

public uploadFile(file: File): Observable<APIResponse> {
  const url = `${environment.apiURL}/api/other/upload`;

  const formData = new FormData();
  formData.append("file", file, file.name);

  return this.http.post<APIResponse>(url, { formData });
}

Finally, the code in my FileController :

public function upload(Request $request)
{
    dd($request->all()); // Shows as [ "formData" => [] ]

    $file = $request->file('file');
    dd($file); // Shows as null
}

Sorry for the wall of code, but wanted to give you a clear insight into how it currently works.

From what I've found online, using FormData is the right thing to do. I'm pretty sure that part is working correctly, because if I do console.log(formData.get("file")); , it displays the file.

I've also seen a lot about the content-type header. I've tried setting this to undefined , application/json , and also application/vnd.openxmlformats-officedocument.spreadsheetml.sheet (this is the type of the file when it's logged in the console).

On the Laravel side of things, whichever way I try to print the file, it always comes through as [] or null .

Also, there are no errors produced from either Angular or Laravel.

For some context, I'm trying to import the spreadsheet to then use Laravel Excel ( https://docs.laravel-excel.com/ ), so I can import the contents of the spreadsheet into a database (so please let me know if there's an easier way to get to that stage!)

Thanks for any help

Answer 1

In case anyone else runs into this issue, the problem wasn't with the code above.

Turns out it was an issue with my Nginx config file - I had to add

client_max_body_size 0;

to my sites-available config file. This removed the default body size limits, which were causing any files larger than 1mb to not come through to the API.