This is how my input tag looks like:
If you are facing issue with ng2-file-upload,
HTML:
component
import { Component, OnInit, ElementRef, ViewChild } from '@angular/core';
@ViewChild('`**activeFrameinputFile**`') `**InputFrameVariable**`: ElementRef;
this.frameUploader.onSuccessItem = (item, response, status, headers) => {
this.`**InputFrameVariable**`.nativeElement.value = '';
};