如何迁移 angularjs 上传功能到 Angular 9

Question

I got the work to migrate my AngularJs code to Angular 9.... And I am stucked with Upload functionalities and they are following:

1. Upload.isFile(obj); //returns boolean to check if the object is file.

2. Upload.dataurltoblob(image Url, "some string"); //converts a dataurl to blob object.

How to get same functionality in latest Angular version?

Function code: // First Upload function

$scope.documentDetails = {};

$scope.downloadFile = function (){

If(! Upload.isFile($scope. documentDetails.imageUrl))
{

    // if true required logic is applied
}

}

// Second Upload function

function showImage(){

if($scope.documentDetails.contentType == "image/tiff" )
{

    $scope.documentDetails.imageUrl = Upload.dataurltoblob ($scope.documentDetails.imageUrl," tiff") ;
}

}

Answer 1

Every $scope property that is referenced in the html should be a public member so it could be referenced from angular component html.

So:

public documentDetails; // Should be public if referenced in the html

public downloadFile() {
   If(!Upload.isFile(this.documentDetails.imageUrl))
   {
      // if true required logic is applied
   }
}

public showImage() {
   if(this.documentDetails.contentType == "image/tiff" )
   {

       this.documentDetails.imageUrl = Upload.dataurltoblob (this.documentDetails.imageUrl," tiff") ;
   } 
}