Angular 6 CSV download | 易学教程

问题

I'm new to angular, currently i'm working in a project which needs an csv export. Here i'm using Angular 6 as frontend and laravel as backend

This is how i wrote laravel function using mattwebsite/excel

// Lead export to csv
public function downloadExcel(Request $request)
{
    $credentials = $request->only('token');
    $token = $credentials['token'];
    $userid = $this->getUseridFromToken($token);
    $type = "xls";
    $data = DB::table('user_mailbox AS A')
                    ->select('A.id', 'A.name', 'A.email', 'A.phone', DB::raw('DATE_FORMAT(A.send_on, "%d / %b / %Y") as send_on'), 'B.listing_heading','B.listing_id','B.listing_heading', 'C.name')
                    ->leftjoin('broker_listing AS B', 'B.listing_id', '=', 'A.listing_id')
                    ->leftjoin('users AS C', 'C.id', '=', 'A.sent_by')
                    ->where('A.sent_to', $userid)
                    ->where('A.user_type', '1')
                    ->orderBy('A.id', 'desc')->get()->toArray(); 
    Excel::create('Lead_Export', function($excel) use ($data) {
        $excel->sheet('Lead_Export', function($sheet) use ($data)
        {
            $sheet->fromArray($data);
        });
    })->download($type);
}

This is how i wrote function in angular component

    // Download leads as excel
download_excel(){
  const fd = new FormData(); 
  fd.append('token',this.token);
  this.brokerleads.downloadLeads(fd).subscribe(
    data => this.handleResponsedwnload(data),
    error => this.handleErrordwnload(error)
  );
}
handleResponsedwnload(data){ console.log('test');
  const blob = new Blob([data], { type: 'text/xls' });
  const url= window.URL.createObjectURL(blob);
  window.open(url);
}
handleErrordwnload(data){

}

service is like this

  // Download as excel
  downloadLeads(data):Observable<any>{
    return this.http.post(`${this.baseUrl}downloadExcel`, data);   
  }

view

    <a class="export-leads" href="javascript:void(0);" (click)="download_excel()" >EXPORT LEADS</a>

while doing this i'm getting response like this but file is not downloading

回答1:

This can also be done using file-saver:

import * as FileSaver from 'file-saver';

this.http.post(`${this.baseUrl}downloadExcel`, data, { responseType: 'blob' })
 .subscribe((resp: any) => {
    saveAs(resp, `filename.csv`)
 });

回答2:

You need to navigate the browser to the route where the Excel file is made on the backend (in a new tab) either with a link <a href="path" target="_blank"> or with window.open

The ->download() function sets headers so that the file will be automatically downloaded.

When you fetch this data with an AJAX call (which is what HttpClient does) you simply get the binary data returned (which is what you see in your Response tab in Chrome developer tools).

(There are front-end hacks to download a file retrieved by ajax such as creating a link element and clicking it with JavaScript (see below), but they can not be recommended):

let fileName = 'filename.xlsx';
let a = document.createElement('a');

a.href = window.URL.createObjectUrl(responseData);
a.download = fileName;
a.click();

来源：https://stackoverflow.com/questions/55771863/angular-6-csv-download

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