Ole Spaarmann Ole Spaarmann - 6 days ago 11
Javascript Question

Angular 2: How to prevent a form from submitting on keypress enter?

I have a form with one field that acts as autocomplete. If the user enters a word and presses enter, the content of the field should be added to a list below the field.

The problem: When the user hits enter, naturally the whole form is being submitted.

I already

return false
on the function that handles the keypress. But the form seems to be submitted even before this function is called.

How do I prevent this from happening?

The basic form:

<div id="profileForm">
<form [formGroup]="profileForm" (ngSubmit)="onSubmit()" method="post" *ngIf="!showSuccessMessage">

<div class="row">

<div class="form-group col-xs-12 col-sm-6">
<label for="first_name">My Skills</label>
<div class="autocomplete">
<input formControlName="skill_string" [(ngModel)]="skillString" name="skill_string"
type="text" class="form-control" id="skill_string" placeholder="Comma separated" (keyup.enter)="skillsHandleEnter(skillString)">
<ul class="autocomplete-list" *ngIf="skillHints.length > 0">
<li class="list-item" *ngFor="let skill of skillHints" (click)="addSkillFromAutocomplete(skill)">{{skill}}</li>
</ul>
</div>
<div id="skill-cloud" class="tag-cloud">
<span class="skill-tag tag label label-success" *ngFor="let skill of selectedSkills" (click)="removeSkill(skill)">{{skill}} x</span>
</div>
</div>

</div>

<div class="row">

<hr>

<div class="form-group submit-group">
<div class="col-sm-12">
<button type="submit" class="btn btn-primary pull-right" [disabled]="!profileForm.valid">Save</button>
</div>
</div>

</div>

</form>
</div>


The basic component (I stripped a lot of the logic for posting it here):

import { Component, OnInit } from '@angular/core';
import { FormGroup, FormBuilder } from '@angular/forms';
import { ActivatedRoute, Router } from '@angular/router';

import { Subscription } from 'rxjs/Rx';
import 'rxjs/add/operator/debounceTime';
import * as _ from 'lodash';

import { MemberService } from '../shared/index';

@Component({
moduleId: module.id,
selector: 'signup',
templateUrl: 'signup.component.html',
styleUrls: ['signup.component.css']
})
export class SignupComponent implements OnInit {

private profileForm:FormGroup;
private validation_errors:Array<any>;
private selectedSkills:Array<string>;
private skillHints:Array<string>;
private skillString:string;

constructor(private route: ActivatedRoute,
private formBuilder: FormBuilder,
private memberService: MemberService,
private router: Router ) {

this.selectedSkills = [];
this.skillHints = [];
this.skillString = '';

// Set up form
this.profileForm = this.formBuilder.group({
skill_string: ['']
});

}

ngOnInit(): any {
// Do something
}



updateSelectedSkills(skillString:string):void {
if(skillString) ) {
let cleanString = skillString.trim().replace(/[ ]{2,}/g, ' ');
this.selectedSkills = _.compact(this.selectedSkills.concat(cleanString.split(',')));
this.skillString = '';
this.skillHints = [];
}
}

skillsHandleEnter(skillString:string):void {
console.log("ENTER");
this.updateSelectedSkills(skillString);
return false;
}

autocompleteSkills(term:string):void {
this.memberService.autocompleteSkills(term).subscribe(
res => {
this.skillHints = [];
for(let i = 0; i < res.data.length; i++) {
this.skillHints.push(res.data[i].name);
}
}
);
}

addSkillFromAutocomplete(skillString:string):void {
this.selectedSkills.push(skillString);
this.memberProfile.skill_string = '';
this.skillHints = [];
this.skillString = '';
}


onSubmit():void {
this.memberService.saveProfile(this.memberProfile, this.selectedSkills).subscribe(
res => {
console.log(res);
}
);
}

}

Answer

Try

<form (keydown.enter)="$event.target.tagName == 'TEXTAREA'" [formGroup]="profileForm" (ngSubmit)="onSubmit($event)">

It will also allow enter in Textareas.