I am having trouble finding out how to mark all form's fields as touched.
The main problem is that if I do not touch fields and try to submit form - validation error in not shown up. I have placeholder for that piece of code in my controller.
My idea is simple:
- user clicks submit button
- all fields marks as touched
- error formatter reruns and displays validation errors
If anyone have other idea how to show errors on submit, without implementing new method - please share them. Thanks!
My simplified form:
<form class="form-horizontal" [formGroup]="form" (ngSubmit)="onSubmit(form.value)">
<input type="text" id="title" class="form-control" formControlName="title">
<span class="help-block" *ngIf="formErrors.title">{{ formErrors.title }}</span>
<button>Submit</button>
</form>
And my controller:
import {Component, OnInit} from '@angular/core';
import {FormGroup, FormBuilder, Validators} from '@angular/forms';
@Component({
selector : 'pastebin-root',
templateUrl: './app.component.html',
styleUrls : ['./app.component.css']
})
export class AppComponent implements OnInit {
form: FormGroup;
formErrors = {
'title': ''
};
validationMessages = {
'title': {
'required': 'Title is required.'
}
};
constructor(private fb: FormBuilder) {
}
ngOnInit(): void {
this.buildForm();
}
onSubmit(form: any): void {
// somehow touch all elements so onValueChanged will generate correct error messages
this.onValueChanged();
if (this.form.valid) {
console.log(form);
}
}
buildForm(): void {
this.form = this.fb.group({
'title': ['', Validators.required]
});
this.form.valueChanges
.subscribe(data => this.onValueChanged(data));
}
onValueChanged(data?: any) {
if (!this.form) {
return;
}
const form = this.form;
for (const field in this.formErrors) {
if (!this.formErrors.hasOwnProperty(field)) {
continue;
}
// clear previous error message (if any)
this.formErrors[field] = '';
const control = form.get(field);
if (control && control.touched && !control.valid) {
const messages = this.validationMessages[field];
for (const key in control.errors) {
if (!control.errors.hasOwnProperty(key)) {
continue;
}
this.formErrors[field] += messages[key] + ' ';
}
}
}
}
}
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