angular - Cleanest way to reset forms

Question

What is the cleanest way to reset forms in Angular 2 latest version? I would like to reset the input textboxes after adding a post.

@Component({
  selector: 'post-div',
  template: `
            <h2>Posts</h2>
            <form (submit)="addPost()">
                <label>Title: </label><input type="text" name="title" [(ngModel)]="title"><br/>
                <label>Body: </label><input type="text" name="body" [(ngModel)]="body"><br/>
                <input type="submit" value="Add Post">
            </form>
            <ul>
                <li *ngFor="let post of posts">
                    <strong>{{post.title}}</strong>
                    <p>{{post.body}}</p>
                </li>
            </ul>
          `,
  providers: [PostService]
});

addPost(){
    this.newPost = {
        title: this.title,
        body: this.body
    }
    this._postService.addPost(this.newPost);
}

Answer 1

Add a reference to the ngForm directive in your html code and this gives you access to the form, so you can use .resetForm().

<form #myForm="ngForm" (ngSubmit)="addPost(); myForm.resetForm()"> ... </form>

...Or pass the form to a function:

<form #myForm="ngForm" (ngSubmit)="addPost(myForm)"> ... </form>

addPost(form: NgForm){
    this.newPost = {
        title: this.title,
        body: this.body
    }
    this._postService.addPost(this.newPost);
    form.resetForm(); // or form.reset();
}

The difference between resetForm and reset is that the former will clear the form fields as well as any validation, while the later will only clear the fields. Use resetForm after the form is validated and submitted, otherwise use reset.

---

Adding another example for people who can't get the above to work.

With button press:

<form #heroForm="ngForm">
    ...
    <button type="button" class="btn btn-default" (click)="newHero(); heroForm.resetForm()">New Hero</button>
</form>

Same thing applies above, you can also choose to pass the form to the newHero function.