如何使用角度8上传图像

Question

app.module.ts

 ngOnInit() {
this.userForm = this.fb.group({
  firstName : ['', Validators.required],
  gender : ['', Validators.required],
  maritalStatus : ['', Validators.required],
  lastName : ['', Validators.required],
  dob : ['', Validators.required],
  nationality : ['', Validators.required],
  pic : [''],
  streetAddress : ['', Validators.required],
  city : ['', Validators.required],
  postalCode : ['', Validators.required],
  phone : ['', Validators.required],
  state : ['', Validators.required],
  country : ['', Validators.required],
  email : ['', Validators.required],
  jobTitle : ['', Validators.required],
  dateOfJoining : ['', Validators.required],
  department : ['', Validators.required],
  employeeStatus : ['', Validators.required],
  kra : ['', Validators.required],
  assignedSupervisor : ['', Validators.required],
  assignedSubordinate : ['', Validators.required],
  workExperience : ['', Validators.required],
  skills : ['', Validators.required],
  education : ['', Validators.required],
  password : ['', Validators.required]
})
}

onSubmit() {
this.submitted = true;
this.userService.addUser(this.userForm.value).subscribe(
  res => {
    this.model = res
    console.log(res)
  },
  error => {
    this.error = error,
    console.log(error)
  }
)

app.component.html

<div class="col-lg-12 col-12 mt-2">
 <label for="pic">Profile Picture</label><br/>
 <input type="file" formControlname='pic' name='pic'/>
</div>

app.service.ts

addUser(formData: User) {
return this.http.post<User>(`${this.serverUrl}`, formData).pipe(
  catchError(this.handleError)
);

}

一切正常。我只想知道如何在angular 8中上传图片。图片是使用在邮递员上测试过的节点在后端上传的。谁能帮助我如何使用angular上传图片，请帮助我

Answer 1

在发出发布请求之前，将您的formData转换为实际的FormData，如下所述：https://developer.mozilla.org/en-US/docs/Web/API/FormData/FormData。

使用

addUser(formData: User) {
  const body = new FormData();
  for(const [key, value] of formData){
     if(key === 'pic'){
        body.append(key, value)
     }
     body.append(key, `${value}`)
  }
  return this.http.post<User>(`${this.serverUrl}`, body).pipe(catchError(this.handleError);
);

然后您的后端应该可以识别该文件。不幸的是FormData期望string或blob作为该值的数据类型。