Angular 5 download excel file with mail request

Question

I ran into a problem when I downloaded an Excel file using Angular 1, but if I implement the same code in Angular 5, it shows an error that your file is damaged. My answer is in ArrayBuffer and I cannot read the file.

Below is my code:

Services:

 DownloadData(model:requiredParams):Observable<any>{
  const headers = new Headers();
  const requestOptions = new RequestOptions({ headers: headers });
  requestOptions.headers.append('Content-Type', 'application/json');

   const body = JSON.stringify(model);
  return this.http.post(url, body, requestOptions)
  .map((res:any) => res)
 .catch((e: any) => Observable.throw(this.errorHandler(e)));
 }

component:

exportToExcel() {
    this.loadingOverlayFlag = true;
   this.podashboardService.DownloadData(this.data).subscribe(result=>{
    console.log(result);
    this.downloadFile(result._body,'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet', 'export.xlsx');
  })
  }

 downloadFile(blob: any, type: string, filename: string) {

 var binaryData = [];
   binaryData.push(blob);

     const url = window.URL.createObjectURL(new Blob(binaryData, {type: "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"})); // <-- work with blob directly

     // create hidden dom element (so it works in all browsers)
     const a = document.createElement('a');
     a.setAttribute('style', 'display:none;');
     document.body.appendChild(a);

     // create file, attach to hidden element and open hidden element
     a.href = url;
     a.download = filename;
     a.click();

   }

I can download the file, but could not read its contents. Error:

Microsoft Excel
Excel cannot open the ███████ DASHBOARD (5) .xlsx 'file because the file format or file extension is invalid. Make sure the file has not been corrupted and the file extension matches the file format. Ok

Answer 1

. angular HttpClient XMLHttpRequest :

var oReq = new XMLHttpRequest();
  oReq.open("POST", url, true);
  oReq.setRequestHeader("content-type", "application/json");
  oReq.responseType = "arraybuffer";

  oReq.onload = function (oEvent) {
    var arrayBuffer = oReq.response;
    if (arrayBuffer) {
      var byteArray = new Uint8Array(arrayBuffer);
      console.log(byteArray, byteArray.length);
      this.downloadFile(byteArray, 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet', 'export.xlsx');
    }
  };

  oReq.send(body);

Blob downloadFile:

const url = window.URL.createObjectURL(new Blob([binaryData]));

:

DownloadData(model:requiredParams):Observable<any>{
  return new Observable(obs => {
    var oReq = new XMLHttpRequest();
    oReq.open("POST", url, true);
    oReq.setRequestHeader("content-type", "application/json");
    oReq.responseType = "arraybuffer";

    oReq.onload = function (oEvent) {
      var arrayBuffer = oReq.response;
      var byteArray = new Uint8Array(arrayBuffer);
      obs.nex(byteArray);
    };

    const body = JSON.stringify(model);
    oReq.send(body);
  });
}

:

exportToExcel() {
  this.loadingOverlayFlag = true;
  this.podashboardService.DownloadData(this.data).subscribe(result=>{
    // console.log(result);
    this.downloadFile(result,'application/vnd.openxmlformats-
    officedocument.spreadsheetml.sheet', 'export.xlsx');
  })
}

downloadFile(blob: any, type: string, filename: string) {

  var binaryData = [];
  binaryData.push(blob);

  const url = window.URL.createObjectURL(new Blob(binaryData)); // <-- work with blob directly

   // create hidden dom element (so it works in all browsers)
   const a = document.createElement('a');
   a.setAttribute('style', 'display:none;');
   document.body.appendChild(a);

   // create file, attach to hidden element and open hidden element
   a.href = url;
   a.download = filename;
   a.click();
}