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* Copyright (c) Siemens 2016 - 2025
* SPDX-License-Identifier: MIT
*/
import { formatDate } from '@angular/common';
import {
booleanAttribute,
computed,
Directive,
HostListener,
inject,
input,
LOCALE_ID,
model,
OnChanges,
output,
signal,
SimpleChanges
} from '@angular/core';
import {
AbstractControl,
ControlValueAccessor,
NG_VALIDATORS,
NG_VALUE_ACCESSOR,
ValidationErrors,
Validator,
Validators
} from '@angular/forms';
import { SI_FORM_ITEM_CONTROL, SiFormItemControl } from '@siemens/element-ng/form';
import { compareDate, getMaxDate, getMinDate, isValid, parseDate } from './date-time-helper';
import { DatepickerInputConfig, getDatepickerFormat } from './si-datepicker.model';
/**
* Base directive for date input fields.
*/
@Directive({
selector: 'input[siDateInput]',
providers: [
{
provide: NG_VALUE_ACCESSOR,
useExisting: SiDateInputDirective,
multi: true
},
{
provide: NG_VALIDATORS,
useExisting: SiDateInputDirective,
multi: true
},
{
provide: SI_FORM_ITEM_CONTROL,
useExisting: SiDateInputDirective
}
],
host: {
'[attr.id]': 'id()',
'[attr.disabled]': 'disabled() || null',
'[attr.readonly]': 'readonly() || null',
'[class.readonly]': 'readonly()',
'[attr.aria-describedby]': 'errormessageId()',
'[value]': 'dateString()'
},
exportAs: 'siDateInput'
})
export class SiDateInputDirective
implements ControlValueAccessor, OnChanges, Validator, SiFormItemControl
{
private static idCounter = 0;
/**
* @defaultValue
* ```
* `si-date-input-${SiDateInputDirective.idCounter++}`
* ```
*/
readonly id = input(`si-date-input-${SiDateInputDirective.idCounter++}`);
/**
* Configuration object for the datepicker.
*
* @defaultValue
* ```
* {}
* ```
*/
readonly siDatepickerConfig = model<DatepickerInputConfig | undefined>({});
/**
* Emits an event to notify about disabling the time from the datepicker.
* When time is disable, we construct a pure date object in UTC 00:00:00 time.
*/
readonly siDatepickerDisabledTime = output<boolean>();
/**
* Emits an event on state changes e.g. readonly, disable, ... .
*/
readonly stateChange = output<void>();
/**
* Whether the date range input is disabled.
* @defaultValue false
*/
// eslint-disable-next-line @angular-eslint/no-input-rename
readonly disabledInput = input(false, { alias: 'disabled' });
/**
* Whether the date range input is readonly.
* @defaultValue false
*/
readonly readonly = input(false, { transform: booleanAttribute });
/**
* This ID will be bound to the `aria-describedby` attribute of the date-input.
* Use this to reference the element containing the error message(s) for the date-input.
* It will be picked by the {@link SiFormItemComponent} if the date-input is used inside a form item.
*
* @defaultValue
* ```
* `${this.id()}-errormessage`
* ```
*/
readonly errormessageId = input(`${this.id()}-errormessage`);
/** @internal */
validatorOnChange = (): void => {};
/**
* Date form input validator function, validating text format, min and max value.
*/
protected validator = Validators.compose([
() => this.formatValidator(),
() => this.minValidator(),
() => this.maxValidator()
])!;
protected date?: Date;
/**
* Emits a new `date` value on input field value changes.
*/
protected readonly dateChange = output<Date | undefined>();
/** @internal */
public readonly disabled = computed(() => this.disabledInput() || this.disabledNgControl());
protected onTouched: () => void = () => {};
protected onModelChange: (value: any) => void = () => {};
protected readonly dateString = signal('');
private readonly disabledNgControl = signal(false);
protected readonly locale = inject(LOCALE_ID).toString();
private format = '';
ngOnChanges(changes: SimpleChanges): void {
if (changes.siDatepickerConfig && !changes.siDatepickerConfig.currentValue) {
this.siDatepickerConfig.set({});
}
if (changes.readonly || changes.disabledInput) {
this.stateChange.emit();
}
if (changes.siDatepickerConfig) {
// reflect possible change is date/time format
const format = this.format;
this.format = '';
this.getFormat();
const formatChanged = format !== this.format;
if (this.date && formatChanged) {
this.updateNativeValue();
}
}
}
validate(c: AbstractControl): ValidationErrors | null {
return this.validator(c);
}
registerOnChange(fn: any): void {
this.onModelChange = fn;
}
registerOnTouched(fn: () => void): void {
this.onTouched = fn;
}
registerOnValidatorChange(fn: () => void): void {
this.validatorOnChange = fn;
}
setDisabledState(isDisabled: boolean): void {
this.disabledNgControl.set(isDisabled);
this.stateChange.emit();
}
writeValue(value?: Date | string): void {
// remove date when user input is empty
let emptyString = false;
// Flag to define invalid string
let invalidDate = false;
if (typeof value === 'string') {
emptyString = value.trim().length === 0;
value = parseDate(value, this.getFormat(), this.locale);
invalidDate = !value;
}
// Only emit changes to prevent that a destroyed output emit a value
if (this.date !== value) {
this.date = value;
this.dateChange.emit(this.date);
// We should not change the content of the input field when the user typed
// a wrong input. Otherwise the typed content changes and the user cannot
// correct the content.
if (!invalidDate || emptyString) {
this.updateNativeValue();
}
}
}
private updateNativeValue(): void {
let dtStr = '';
if (isValid(this.date)) {
dtStr = formatDate(this.date, this.getFormat(), this.locale);
}
this.dateString.set(dtStr);
}
/**
* Handles `input` events on the input element.
*/
@HostListener('input', ['$event'])
protected onInput(event: Event): void {
const value = (event.target as HTMLInputElement).value;
const parsedDate = parseDate(value, this.getFormat(), this.locale);
// Is same date
const hasChanged = !(parsedDate === this.date);
if (hasChanged) {
this.date = parsedDate;
this.onModelChange(this.date);
this.dateChange.emit(this.date);
}
}
@HostListener('blur', ['$event']) protected onBlur(event: FocusEvent): void {
this.onTouched();
}
private getFormat(): string {
if (!this.format) {
this.format = getDatepickerFormat(this.locale, this.siDatepickerConfig());
}
return this.format;
}
/**
* Callback when the datepicker changes his value.
* @param date - updated date
*/
protected onDateChanged(date?: Date): void {
// update input element
this.writeValue(date);
// update the Forms ngModel
this.onModelChange(this.date);
}
/**
* Datepicker consider time / ignore time changed.
* @param disabledTime - disable time
* @internal
*/
onDisabledTime(disabledTime: boolean): void {
this.format = '';
// Temporary reset internal date to force an update with the new date format
const currentDate = this.date;
this.date = undefined;
this.siDatepickerConfig()!.disabledTime = disabledTime;
// Ensure the time format will be removed
this.onDateChanged(currentDate);
this.siDatepickerDisabledTime.emit(disabledTime);
}
/** The form control validator for date format */
private formatValidator(): ValidationErrors | null {
const invalidFormat = this.date && isNaN(this.date.getTime());
return invalidFormat ? { dateFormat: { format: this.getFormat() } } : null;
}
/** The form control validator for the min date. */
private minValidator(): ValidationErrors | null {
const controlValue = this.date;
const siDatepickerConfig = this.siDatepickerConfig();
const min = getMinDate(siDatepickerConfig?.minDate);
const withTime = siDatepickerConfig?.showTime;
return !min ||
!isValid(controlValue) ||
(withTime ? controlValue >= min : compareDate(controlValue, min) >= 0)
? null
: { minDate: { min, actual: controlValue } };
}
/** The form control validator for the min date. */
private maxValidator(): ValidationErrors | null {
const controlValue = this.date;
const siDatepickerConfig = this.siDatepickerConfig();
const max = getMaxDate(siDatepickerConfig?.maxDate);
const withTime = siDatepickerConfig?.showTime;
return !max ||
!isValid(controlValue) ||
(withTime ? controlValue <= max : compareDate(controlValue, max) <= 0)
? null
: { maxDate: { max, actual: controlValue } };
}
}
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