How to reset selected file with input tag file type in Angular 2?

Question

This is how my input tag looks like:

Rese         


        

Answer 1

I typically reset my file input after capturing the selected files. No need to push a button, you have everything required in the $event object that you're passing to onChange:

onChange(event) {
  // Get your files
  const files: FileList = event.target.files;

  // Clear the input
  event.srcElement.value = null;
}

Different workflow, but the OP doesn't mention pushing a button is a requirement...

Answer 2

I have add this input tag into form tag..

 <form id="form_data">
  <input  type="file" id="file_data"  name="browse"
  (change)="handleFileInput($event, dataFile, f)"  />
</form>

I angular typescript, I have added below lines, get your form id in document forms and make that value as null.

    for(let i=0; i<document.forms.length;i++){
      if(document.forms[i].length > 0){
             if(document.forms[i][0]['value']){ //document.forms[i][0] = "file_data"
                 document.forms[i][0]['value'] = "";
              }
      }
    }

Print document.forms in console and you can get idea..

Answer 3

In my case I did it as below:

 <input #fileInput hidden (change)="uploadFile($event.target.files)" type="file" />
 <button mat-button color="warn" (click)="fileInput.value=''; fileInput.click()"> Upload File</button>

I am resetting it using #fileInput in HTML rather than creating a ViewChild in component.ts . Whenever the "Upload File" button is being clicked, first it resets the #fileInput and then triggers #fileInput.click() function. If any separate button needed to reset then on click #fileInput.value='' can be executed.

Answer 4

Angular 5

html

<input type="file" #inputFile>

<button (click)="reset()">Reset</button>

template

@ViewChild('inputFile') myInputVariable: ElementRef;

reset() {
    this.myInputVariable.nativeElement.value = '';
}

Button is not required. You can reset it after change event, it is just for demonstration

Answer 5

<input type="file" id="image_control" (change)="validateFile($event)" accept="image/gif, image/jpeg, image/png" />

validateFile(event: any): void {
    const self = this;
    if (event.target.files.length === 1) {
      event.srcElement.value = null;
    }
  }

Answer 6

Short version Plunker:

import { Component } from '@angular/core';

@Component({
  selector: 'my-app',
  template: `
      <input #myInput type="file" placeholder="File Name" name="filename">
      <button (click)="myInput.value = ''">Reset</button>
  `
})
export class AppComponent {


}

And i think more common case is to not using button but do reset automatically. Angular Template statements support chaining expressions so Plunker:

import { Component } from '@angular/core';

@Component({
  selector: 'my-app',
  template: `
      <input #myInput type="file" (change)="onChange(myInput.value, $event); myInput.value = ''" placeholder="File Name" name="filename">
  `
})
export class AppComponent {

  onChange(files, event) {
    alert( files );
    alert( event.target.files[0].name );
  }

}

And interesting link about why there is no recursion on value change.