![](/img/trans.png)
[英]Angular HttpClient Post Two Files (Multipart/form-data)
[英]Use multipart/form-data to send files in Angular 6
我嘗試將兩個字段發送到后端服務。 一個是公用字符串,另一個是文件字段。 當我嘗試使用Http Client的post方法時,服務器收到500錯誤消息,告訴我內容類型不是多部分請求。
附加新language.component.html
<form [formGroup]="form" (ngSubmit)="sendForm()">
<input
type="file"
formControlName="file"
(change)="onFileChanged($event)"
/>
<mat-form-field class="new-language__language-select">
<mat-select placeholder="Seleziona la lingua" formControlName="language">
<mat-option *ngFor="let lang of languages" [value]="lang.id">{{lang.label}}</mat-option>
</mat-select>
</mat-form-field>
<button mat-raised-button [disabled]="form.invalid">Upload</button>
</form>
附加新language.component.ts
export class AddNewLanguageComponent implements OnInit {
@Input() languages: Type[];
form: FormGroup;
file: File;
constructor() {
private fb: FormBuilder;
private dictionariesService: DictionariesService;
}
ngOnInit() {
this.initForm();
}
private initForm(): void {
this.form = this.fb.group({
file: [null, Validators.required],
language: [null, Validators.required]
});
}
onFileChanged(event): void {
if (event.target.files && event.target.files.length) {
this.file = <File>event.target.files[0];
}
}
sendForm(): void {
this.dictionariesService
.saveSynonymsFile(this.form, this.file)
.subscribe(response => console.log(response));
}
}
dictionaries.service.ts
saveSynonymsFile(form: FormGroup, file: File): Observable<DictionaryFile> {
const formData = new FormData();
formData.append('lang', form.value.language);
formData.append('synonyms', file);
return this.http.post<DictionaryFile>(
`${this.querySettingsUrl}/synonyms`,
formData
);
}
我也嘗試用Content-Type強制HttpHeaders:multipart / form-data但無所事事。 瀏覽器始終通過Content-Type發送數據:application / json
不是創建用於保存文件的服務, RxFormBuilder
從@rxweb導入RxFormBuilder
,創建其對象並使用toFormData()
方法,該方法會將json數據轉換為formData,這里我在服務器端傳遞了api鏈接供您參考,它將將fileObject傳遞給服務器。 在html中添加[writeFile]="true"
時,無需調用onFileChanged($ event)
Component.html:
export class AddNewLanguageComponent implements OnInit {
@Input() languages: Type[];
form: RxFormGroup;
api:string = 'api/User'
constructor(private fb: RxFormBuilder,private http: HttpClient) {}
ngOnInit() {
this.initForm();
}
private initForm(): void {
this.form = <RxFormGroup>this.fb.group({
file: [null, Validators.required],
language: [null, Validators.required]
});
}
sendForm(): void {
let formdata = this.form.toFormData()
this.http.post(this.api, formdata); // This is fake uri, This is just for your reference
}
}
並在component.html中:
<form [formGroup]="form" (ngSubmit)="sendForm()">
<input
type="file"
formControlName="file"
[writeFile]="true"
/>
<mat-form-field class="new-language__language-select">
<mat-select placeholder="Seleziona la lingua" formControlName="language">
<mat-option *ngFor="let lang of languages" [value]="lang.id">{{lang.label}}</mat-option>
</mat-select>
<button>Upload</button>
</form>
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.