HI,
I'm using ng2-file-upload with angular 5. I'm trying to write a custom
filter where I want to compare file headers (parsed from a CSV file) with
table headers (coming from server response)
here's my code -
fileTemplateFilter() {
return Observable.create(observable => {
this.uploader.options.filters.push({
name: 'fileTemplateFilter',
fn: (item, options) => {
var type = item.type || null;
if (type == "application/pdf") return true;
this.fileUploadLoader = true;
let tableHeaders, fileHeaders;
Observable.forkJoin([
this.getCsvHeaders(item.name, 1).subscribe((res: any)
=> {
tableHeaders = res;
console.log(tableHeaders);
}),
this.getFileHeaders(item.rawFile).subscribe(res => {
fileHeaders = res;
console.log(fileHeaders);
})
]).subscribe(() => {
if (fileHeaders && tableHeaders) {
var is_same = (fileHeaders.length ==
tableHeaders.length) && fileHeaders.every(function (element, index) {
return element === tableHeaders[index];
});
if (is_same == true) {
this.fileUploadLoader = false;
observable.next(is_same);
return observable.complete();
} else {
console.error('file template doesn\'t match for
this file - ' + item.name + ' ...!', 'Error');
this.fileUploadLoader = false;
observable.next(is_same);
return observable.complete();
}
} else {
this.fileUploadLoader = false;
observable.next(false);
return observable.complete();
}
})
}
})
})
}
I was using this filter in AngularJS & now I want the similar in Angular 5
<https://mindmajix.com/angularjs-training>. Finally, I want to only return
true/false from this filter. but I'm stuck at Observables.
I'm calling this function fileTemplateFilter() in constructor. But it
doesn't work when I select a file to upload. And it's returning this error
- ERROR TypeError: You provided an invalid object where a stream was
expected. You can provide an Observable, Promise, Array, or Iterable ... at
ForkJoinSubscriber.
Thank you
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