是否可以将 FormData 与图像文件一起从 Angular 6 应用程序发送到 Web API

Question

是否可以将表单数据连同图像文件一起从 angular 6 应用程序传递到 Web api。

app.component.ts

onSelectFile(event) {
  if (event.target.files && event.target.files[0]) {
    this.imageToUpload = event.target.files[0];
    const reader = new FileReader();
    reader.onload = e => this.selectedImage = reader.result.toString();
    this.fileName = event.target.files[0].name;
    reader.readAsDataURL(this.imageToUpload);
  }
}

createNewComitteeMember() {
  var mServiceObject = {
    ComitteeMemberName: this.comittee_Member_Name.value,
    ComitteeMemberNumber: this.comittee_Member_Number.value,
    ComitteeMemberType: this.comittee_Type.value,
    ComitteeMemberTypeOthers: this.comittee_Type_Others.value,

    ComitteeMemberPosition: this.comittee_Member_Position.value,
    ComitteeMemberPositionOthers: this.comittee_Member_Position_Others.value,
    ComitteeMemberStatus: this.comittee_Member_Status.value
  }

  this.dmlService.CreateNewComitteeMember(mServiceObject, this.imageToUpload ).subscribe(data => {
    console.log(data);

  });
}

service.ts

CreateNewComitteeMember(mFormData,mImage){
// here how can I merge the mFormData and mImage and pass it to the web API
}

谁能帮我解决这个问题。

Answer 1

要将两个对象合并为一个对象，您可以简单地执行以下操作：

createNewComitteeMember(mFormData, mImage) {
   mFormData['image'] = mImage;
}

您所呈现内容的主要问题是 HTTP 对您可以访问的数据量有限制 POST。要解决这个问题，您需要将 Content-Type Header 设置为 'multipart/form-data'。这意味着需要 HTTP 多次访问服务器才能获得所有数据，因此将数据组合在一起似乎没有必要，但如果必须

Answer 2

您可以在这里使用 FormData

CreateNewComitteeMember(mFormData,mImage){
  const HttpUploadOptions = {
    headers: new HttpHeaders({ "Content-Type": "multipart/form-data"})
  }
  const formData = new FormData();
  formData.append('data', mFormData);
  formData.append('image', mImage);
  return this.httpClient.post(url, formData, HttpUploadOptions)
}

有关FormData

的更多信息

Answer 3

您可以使用 FormData

服务：

checkdata(selectedFile:File){
        let httpheader = new HttpHeaders();
        let options={
            headers: httpheader
        };
        const uploadData = new FormData();
        uploadData.append('File', selectedFile, selectedFile.name);
        return  this.http.post('uri',uploadData,options)
    }

组件：

 onSelectFile(event) {
       if (event.target.files && event.target.files[0]) {
           this.imageToUpload = event.target.files[0];
           this.Yourservice.checkdata(this.imageToUpload)
      }
  }

Answer 4

你可以试试这个对我有用的方法

const formdata = new FormData();
formdata.append("userData", this.userData.value);
formdata.append("image", this.uploadedFile.value);

是否可以将 FormData 与图像文件一起从 Angular 6 应用程序发送到 Web API

is that possible to send FormData along with Image file to web API from Angular 6 application

angular

typescript

angular6

angular4-forms