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* Copyright (c) Siemens 2016 - 2025
* SPDX-License-Identifier: MIT
*/
import {
booleanAttribute,
ChangeDetectionStrategy,
ChangeDetectorRef,
Component,
computed,
ElementRef,
inject,
input,
numberAttribute,
OnChanges,
output,
signal,
SimpleChanges,
viewChild
} from '@angular/core';
import {
AbstractControl,
ControlValueAccessor,
NG_VALIDATORS,
NG_VALUE_ACCESSOR,
ValidationErrors,
Validator,
ValidatorFn,
Validators
} from '@angular/forms';
import { SI_FORM_ITEM_CONTROL, SiFormItemControl } from '@siemens/element-ng/form';
import { addIcons, elementMinus, elementPlus, SiIconComponent } from '@siemens/element-ng/icon';
import { SiTranslatePipe, TranslatableString } from '@siemens/element-translate-ng/translate';
import { Subscription, timer } from 'rxjs';
@Component({
selector: 'si-number-input',
imports: [SiIconComponent, SiTranslatePipe],
templateUrl: './si-number-input.component.html',
styleUrl: './si-number-input.component.scss',
providers: [
{
provide: NG_VALUE_ACCESSOR,
useExisting: SiNumberInputComponent,
multi: true
},
{
provide: NG_VALIDATORS,
useExisting: SiNumberInputComponent,
multi: true
},
{
provide: SI_FORM_ITEM_CONTROL,
useExisting: SiNumberInputComponent
}
],
changeDetection: ChangeDetectionStrategy.OnPush,
host: {
'[class.show-step-buttons]': 'showButtons()',
'[class.disabled]': 'disabled()',
'[class.readonly]': 'readonly()'
}
})
export class SiNumberInputComponent
implements OnChanges, ControlValueAccessor, Validator, SiFormItemControl
{
private static idCounter = 0;
private static formatValidator: ValidatorFn = control => {
Iif (control.value != null && isNaN(control.value)) {
return { numberFormat: true };
}
return null;
};
/**
* The min. value for HTML input
*
* @defaultValue undefined
*/
readonly minInput = input<number | undefined, unknown>(undefined, {
// eslint-disable-next-line @angular-eslint/no-input-rename
alias: 'min',
transform: numberAttribute
});
/**
* The max. value for HTML input
*
* @defaultValue undefined
*/
readonly maxInput = input<number | undefined, unknown>(undefined, {
// eslint-disable-next-line @angular-eslint/no-input-rename
alias: 'max',
transform: numberAttribute
});
/**
* The step size for HTML input
*
* @defaultValue 1
*/
readonly step = input<number | 'any'>(1);
/** The value */
readonly value = input<number>();
/** Optional unit label */
readonly unit = input<string>();
/**
* Show increment/decrement buttons?
*
* @defaultValue true
*/
readonly showButtons = input(true, { transform: booleanAttribute });
/**
* The aria-label passed to the input
*
* @defaultValue undefined
*/
readonly ariaLabel = input<TranslatableString>(undefined, { alias: 'aria-label' });
/**
* ID that is set on the input, e.g. for `<label for="...">`
*
* @defaultValue
* ```
* `__si-number-input-${SiNumberInputComponent.idCounter++}`
* ```
*/
readonly inputId = input(`__si-number-input-${SiNumberInputComponent.idCounter++}`);
readonly id = computed(() => this.inputId());
/** @defaultValue false */
// eslint-disable-next-line @angular-eslint/no-input-rename
readonly disabledInput = input(false, { alias: 'disabled', transform: booleanAttribute });
/** @defaultValue false */
readonly readonly = input(false, { transform: booleanAttribute });
/**
* The placeholder for input field.
*/
readonly placeholder = input<TranslatableString>();
readonly valueChange = output<number | undefined>();
readonly inputElement = viewChild.required<ElementRef<HTMLInputElement>>('inputElement');
/**
* This ID will be bound to the `aria-describedby` attribute of the number-input.
* Use this to reference the element containing the error message(s) for the number-input.
* It will be picked by the {@link SiFormItemComponent} if the number-input is used inside a form item.
*
* @defaultValue
* ```
* `${this.id()}-errormessage`
* ```
*/
readonly errormessageId = input(`${this.id()}-errormessage`);
protected canInc = true;
protected canDec = true;
protected readonly disabled = computed(() => this.disabledInput() || this.disabledNgControl());
private readonly disabledNgControl = signal(false);
protected onTouched: () => void = () => {};
protected onChange: (val: any) => void = () => {};
protected validator: ValidatorFn | null = SiNumberInputComponent.formatValidator;
protected onValidatorChanged: () => void = () => {};
protected readonly min = computed(() => {
const minVal = this.minInput();
return minVal === undefined || isNaN(minVal) ? undefined : minVal;
});
protected readonly max = computed(() => {
const maxVal = this.maxInput();
return maxVal === undefined || isNaN(maxVal) ? undefined : maxVal;
});
protected readonly icons = addIcons({ elementMinus, elementPlus });
private internalValue?: number;
private autoUpdate$ = timer(400, 80);
private autoUpdateSubs?: Subscription;
private changeDetectorRef = inject(ChangeDetectorRef);
ngOnChanges(changes: SimpleChanges): void {
if (changes.value) {
this.writeValueToInput(this.value());
}
if (changes.minInput || changes.maxInput) {
const minValue = this.min();
const maxValue = this.max();
this.validator = Validators.compose([
minValue != null ? Validators.min(minValue) : null,
maxValue != null ? Validators.max(maxValue) : null,
SiNumberInputComponent.formatValidator
])!;
this.onValidatorChanged();
}
this.updateStepButtons();
}
/** @internal */
registerOnChange(fn: any): void {
this.onChange = fn;
}
/** @internal */
registerOnTouched(fn: () => void): void {
this.onTouched = fn;
}
/** @internal */
setDisabledState(isDisabled: boolean): void {
this.disabledNgControl.set(isDisabled);
}
/** @internal */
writeValue(value: number | undefined): void {
this.writeValueToInput(value);
this.updateStepButtons();
this.changeDetectorRef.markForCheck();
}
/** @internal */
validate(control: AbstractControl): ValidationErrors | null {
return this.validator ? this.validator(control) : null;
}
/** @internal */
registerOnValidatorChange?(fn: () => void): void {
this.onValidatorChanged = fn;
}
protected modelChanged(): void {
const value = this.inputElement().nativeElement.value
? this.inputElement().nativeElement.valueAsNumber
: undefined;
this.internalValue = value;
this.updateStepButtons();
this.onChange(value);
this.valueChange.emit(value);
}
protected autoUpdateStart(event: Event, isIncrement: boolean): void {
const mouseButton = (event as MouseEvent).button;
Iif (mouseButton) {
return;
}
this.onTouched();
event.preventDefault();
const trigger = isIncrement ? () => this.increment() : () => this.decrement();
this.autoUpdateSubs?.unsubscribe();
this.autoUpdateSubs = this.autoUpdate$.subscribe(trigger);
trigger();
}
protected autoUpdateStop(): void {
this.autoUpdateSubs?.unsubscribe();
this.autoUpdateSubs = undefined;
}
private updateStepButtons(): void {
const stepValue = this.step();
const step = typeof stepValue === 'number' ? stepValue : 1;
const max = this.max();
this.canInc = max == null || this.internalValue == null || this.internalValue + step <= max;
const min = this.min();
this.canDec = min == null || this.internalValue == null || this.internalValue - step >= min;
if (!this.canInc || !this.canDec) {
this.autoUpdateStop();
}
}
private decrement(): void {
this.inputElement().nativeElement.stepDown();
this.modelChanged();
}
private increment(): void {
this.inputElement().nativeElement.stepUp();
this.modelChanged();
}
private writeValueToInput(value: number | undefined): void {
this.inputElement().nativeElement.value = value == null ? '' : value.toString();
this.internalValue = value;
}
}
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