Angular: How To Download A File From HttpClient?


Answer :

Blobs are returned with file type from backend. The following function will accept any file type and popup download window:

downloadFile(route: string, filename: string = null): void{      const baseUrl = 'http://myserver/index.php/api';     const token = 'my JWT';     const headers = new HttpHeaders().set('authorization','Bearer '+token);     this.http.get(baseUrl + route,{headers, responseType: 'blob' as 'json'}).subscribe(         (response: any) =>{             let dataType = response.type;             let binaryData = [];             binaryData.push(response);             let downloadLink = document.createElement('a');             downloadLink.href = window.URL.createObjectURL(new Blob(binaryData, {type: dataType}));             if (filename)                 downloadLink.setAttribute('download', filename);             document.body.appendChild(downloadLink);             downloadLink.click();         }     ) }

Try something like this:

type: application/ms-excel

/**  *  used to get file from server  */  this.http.get(`${environment.apiUrl}`,{           responseType: 'arraybuffer',headers:headers}           ).subscribe(response => this.downLoadFile(response, "application/ms-excel"));       /**      * Method is use to download file.      * @param data - Array Buffer data      * @param type - type of the document.      */     downLoadFile(data: any, type: string) {         let blob = new Blob([data], { type: type});         let url = window.URL.createObjectURL(blob);         let pwa = window.open(url);         if (!pwa || pwa.closed || typeof pwa.closed == 'undefined') {             alert( 'Please disable your Pop-up blocker and try again.');         }     }

It took me a while to implement the other responses, as I'm using Angular 8 (tested up to 10). I ended up with the following code (heavily inspired by Hasan).

Note that for the name to be set, the header Access-Control-Expose-Headers MUST include Content-Disposition. To set this in django RF:

http_response = HttpResponse(package, content_type='application/javascript') http_response['Content-Disposition'] = 'attachment; filename="{}"'.format(filename) http_response['Access-Control-Expose-Headers'] = "Content-Disposition"

In angular:

  // component.ts   // getFileName not necessary, you can just set this as a string if you wish   getFileName(response: HttpResponse<Blob>) {     let filename: string;     try {       const contentDisposition: string = response.headers.get('content-disposition');       const r = /(?:filename=")(.+)(?:")/       filename = r.exec(contentDisposition)[1];     }     catch (e) {       filename = 'myfile.txt'     }     return filename   }       downloadFile() {     this._fileService.downloadFile(this.file.uuid)       .subscribe(         (response: HttpResponse<Blob>) => {           let filename: string = this.getFileName(response)           let binaryData = [];           binaryData.push(response.body);           let downloadLink = document.createElement('a');           downloadLink.href = window.URL.createObjectURL(new Blob(binaryData, { type: 'blob' }));           downloadLink.setAttribute('download', filename);           document.body.appendChild(downloadLink);           downloadLink.click();         }       )   }    // service.ts   downloadFile(uuid: string) {     return this._http.get<Blob>(`${environment.apiUrl}/api/v1/file/${uuid}/package/`, { observe: 'response', responseType: 'blob' as 'json' })   }

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