[英]Angular how to progamatically send a Form Data
在线上似乎没有关于发送带有表单数据的api请求的优质文档。
当您使用google时,google会自动假定您要创建客户端反应式表单gui,因此该API的实际部分将被定罪。
即使您按照他们的指南进行操作,也不会在浏览器控制台中看到“表单数据”部分。
这就是我要的 :
但是我的电话看起来像这样:
这是我当前的代码( component.ts
):
public picture: FormData;
addedImage(event) {
this.picture = event.addedFiles[0];
console.log(this.picture);
this.api.uploadFile(this.picture).subscribe();
}
...以及api部分( apis.ts
):
public uploadFile(file){
const url = AppGlobal.API_URL + 'provisioning/api/files';
let httpParams = new HttpHeaders();
httpParams = httpParams.set('Content-Type', 'multipart/form-data');
console.log(httpParams);
return this.http.post<any>(url, file, {headers: httpParams}).pipe(
map((data: any) => {
console.log('return ', data);
if(data) this.s.latestFileId$.next(data);
}
));
}
这是上述component.ts中console.log输出的内容:
File {name: "image.jpg", lastModified: 1568824078958, lastModifiedDate: Wed Sep 18 2019 18:27:58 GMT+0200 (Central European Summer Time), webkitRelativePath: "", size: 69192, …}
lastModified: 1568824078958
lastModifiedDate: Wed Sep 18 2019 18:27:58 GMT+0200 (Central European Summer Time) {}
name: "image.jpg"
size: 69192
type: "image/jpeg"
webkitRelativePath: ""
__proto__: File
api.calls.ts:41
...以及apis.ts中的console.log
HttpHeaders {normalizedNames: Map(0), lazyUpdate: Array(1), headers: Map(0), lazyInit: HttpHeaders}
headers: Map(0)
size: (...)
__proto__: Map
[[Entries]]: Array(0)
length: 0
lazyInit: HttpHeaders {normalizedNames: Map(0), lazyUpdate: null, headers: Map(0)}
lazyUpdate: [{…}]
normalizedNames: Map(0) {}
__proto__: Object
我究竟做错了什么?
这是我尝试过的另一个错误语法( component.ts
):
addedImage(event) {
var oOutput = document.querySelector("div"), oData = new FormData();
oData.append("myfile", event.addedFiles[0], "filename.txt");
this.picture = event.addedFiles[0];
console.log(this.picture);
this.api.uploadFile(oOutput);
}
( apis.ts
):
public uploadFile(file){
const url = AppGlobal.API_URL + 'provisioning/api/files';
const oReq = new XMLHttpRequest();
oReq.open('POST', url, true);
oReq.onload = function(oEvent) {
if (oReq.status == 200) {
console.log('upload success');
} else {
console.log('upload fail');
}
};
oReq.send(file);
}
const formData: FormData = new FormData();
formData.append('files[]', event.addedFiles[0]);
let httpParams = new HttpHeaders();
httpParams = httpParams.set('Accept', '*/*');
this.http.post('some/url', formData, {headers: httpParams})
您也可以参考本指南 。 但是,这不是特定于Angular的。
尝试这个:
constructor(private http: Http) {}
private baseUrl = "api/sth";
private sendData():observable<any>{
const formData: FormData = new FormData();
formData.append(key, value);
const headers = new Headers();
headers.append("Accept", "application/json");
const options = new RequestOptions({ headers: headers });
return this.http
.post(`${this.baseUrl}/url`, formData, options)
.catch(this.handleError);
}
private handleError(error: Response): Observable <any> {
console.error("observable error: ", error);
return Observable.throw(error.statusText);
}
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