Angular 为什么HttpEventType.UploadProgress事件在角度文件上载请求中执行一次?
我正在尝试从angular上传文件。我也想展示一下上传进度 upload.service.tsAngular 为什么HttpEventType.UploadProgress事件在角度文件上载请求中执行一次?,angular,typescript,file-upload,Angular,Typescript,File Upload,我正在尝试从angular上传文件。我也想展示一下上传进度 upload.service.ts public uploadProductImage(obj: FormData, id: string) { return this._http.post(baseUrl + `/product/upload`, obj, { headers: { product_id: id, }, reportProgress : true,
public uploadProductImage(obj: FormData, id: string) {
return this._http.post(baseUrl + `/product/upload`, obj, {
headers: {
product_id: id,
},
reportProgress : true,
observe : 'events'
});
}
uploadClick() {
const fd = new FormData();
// for(const f of this.file_url) {
// fd.append('image', f.file, f.file.name);
// }
fd.append('image', this.file_url[0].file, this.file_url[0].file.name);
this.service.uploadProductImage(fd, this.product_id.toString())
.subscribe(
event => {
if (event.type === HttpEventType.UploadProgress) {
console.log(event.loaded, event.total);
this.progress = Math.round(event.loaded / event.total * 100);
} else if (event.type === HttpEventType.Response) {
console.log(event.body);
this.file_url = [];
}
},
err => {
console.log(err);
}
);
}
上传.component.ts
public uploadProductImage(obj: FormData, id: string) {
return this._http.post(baseUrl + `/product/upload`, obj, {
headers: {
product_id: id,
},
reportProgress : true,
observe : 'events'
});
}
uploadClick() {
const fd = new FormData();
// for(const f of this.file_url) {
// fd.append('image', f.file, f.file.name);
// }
fd.append('image', this.file_url[0].file, this.file_url[0].file.name);
this.service.uploadProductImage(fd, this.product_id.toString())
.subscribe(
event => {
if (event.type === HttpEventType.UploadProgress) {
console.log(event.loaded, event.total);
this.progress = Math.round(event.loaded / event.total * 100);
} else if (event.type === HttpEventType.Response) {
console.log(event.body);
this.file_url = [];
}
},
err => {
console.log(err);
}
);
}
现在图像上传正在工作。只有进度条不工作。我得到一个带有HttpEventType.UploadProgress
立即和event.loaded
和event.total的事件。两者相等
因此progressbar直接变为100
,但完成请求需要一些时间。我也遇到了同样的问题。对我来说,服务器在本地主机上,因此上传是即时的,进度总是100%。
尝试在Chrome中限制请求,在上传完成之前,您将看到其他一些进度百分比
在Chrome中控制网络的步骤如下:
打开开发工具(F12)
单击“网络”选项卡
选择要模拟的连接类型(“慢速3G”即可)
我正在一个新项目中使用这个。它正在工作。希望对你有帮助
import { HttpRequest, HttpEventType, HttpResponse } from '@angular/common/http';
uploadMethod() {
const formData: FormData = new FormData();
formData.append('file', this.selectedFile);
const req = new HttpRequest('POST', apiEndpoint, formData, {
reportProgress: true,
});
this.http.request(req)
.subscribe(
(event) => {
if (event.type === HttpEventType.UploadProgress) {
// This is an upload progress event. Compute and show the % done:
this.percentDone = Math.round(100 * event.loaded / event.total);
console.log(`File is ${this.percentDone}% uploaded.`);
} else if (event instanceof HttpResponse) {
console.log('File is completely uploaded!');
console.log(event.body);
}
},
err => console.error(err)
);
}
对于同样的问题,任何帮助都是值得赞赏的。同样,建议的解决方案是什么?“OP找到了吗?”DARKGuy看到我的答案了。你能找到这个吗useful@RonaldKorze看看我的答案。也许你会发现这很有用