重置表格（反应形式）

Question

This is the HTML:

<div class="container">
  <ng-template [ngIf]="userIsAuthenticated">
    <form [formGroup]='form' name="test">
      <div class="form-group">
        <input type="text" class="form-control" name="header" placeholder="Post Header" formControlName="header">
      </div>
      <div class="input-group">
        <textarea class="form-control" rows="3" name="message" placeholder="Post Message" formControlName="message"></textarea>
      </div>
      <div class="form-group">
        <input class="form-control-file" type="file" id="file1" ng-model="test1" (change)="onFilePicked($event)">
      </div>
      <button class="btn btn-success btn-sm" id="postbtn" type="button" [disabled]="!form.valid" (click)="onSavePost()">{{ btnText }}</button>
    </form>
  </ng-template>
</div>

There is more to it but I use this to reset the form in the TS file:

this.form.reset();

This resets everything apart from the file.

I created this in the mean time to remove the file:

<button ng-click="angular.copy(file1)" #filePicker id="file2" type="reset">Remove files</button> But using this didnt seem like good practice.

I have also tried this in the ts file. this.form.value.file.nativeElement.value = '';

This seems to reload the page, which is not good.

Any advice would be great PLEASE only contributional comments.

Answer 1

Start by binding your input to avalie model with

<input ng-model="test1"> --> <input [(ngModel)]="test1" #fileInput>

And to reset it, declare it as a view child, then reset it like this

@ViewChild('fileInput') fileInput: ElementRef;

resetForm() {
  this.form.reset();
  this.fileInput.nativeElement.value = undefined;
}