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import { Component, ElementRef, EventEmitter, Input, OnInit, Output } from '@angular/core';
import { AbstractControl, FormGroup, FormGroupDirective, NgForm } from '@angular/forms';
import _ from 'lodash';
import { Icons } from '~/app/shared/enum/icons.enum';
/**
* This component will render a submit button with the given label.
*
* The button will disabled itself and show a loading icon when the user clicks
* it, usually initiating a request to the server, and it will stay in that
* state until the request is finished.
*
* To indicate that the request failed, returning the button to the enable
* state, you need to insert an error in the form with the 'cdSubmitButton' key.
* p.e.: this.rbdForm.setErrors({'cdSubmitButton': true});
*
* It will also check if the form is valid, when clicking the button, and will
* focus on the first invalid input.
*
* @export
* @class SubmitButtonComponent
* @implements {OnInit}
*/
@Component({
selector: 'cd-submit-button',
templateUrl: './submit-button.component.html',
styleUrls: ['./submit-button.component.scss']
})
export class SubmitButtonComponent implements OnInit {
@Input()
form: FormGroup | NgForm;
@Input()
type = 'submit';
@Input()
disabled = false;
// A CSS class string to apply to the button's main element.
@Input()
btnClass: string;
@Input()
ariaLabel: string;
@Output()
submitAction = new EventEmitter();
loading = false;
icons = Icons;
constructor(private elRef: ElementRef) {}
ngOnInit() {
this.form.statusChanges.subscribe(() => {
if (_.has(this.form.errors, 'cdSubmitButton')) {
this.loading = false;
_.unset(this.form.errors, 'cdSubmitButton');
// Handle Reactive forms.
if (this.form instanceof AbstractControl) {
(<AbstractControl>this.form).updateValueAndValidity();
}
}
});
}
submit($event: any) {
this.focusButton();
// Special handling for Template driven forms.
if (this.form instanceof FormGroupDirective) {
(<FormGroupDirective>this.form).onSubmit($event);
}
if (this.form.invalid) {
this.focusInvalid();
return;
}
this.loading = true;
this.submitAction.emit();
}
focusButton() {
this.elRef.nativeElement.offsetParent.querySelector(`button[type="${this.type}"]`).focus();
}
focusInvalid() {
const target = this.elRef.nativeElement.offsetParent.querySelector(
'input.ng-invalid, select.ng-invalid'
);
if (target) {
target.focus();
}
}
}
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