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* Copyright (c) Siemens 2016 - 2026
* SPDX-License-Identifier: MIT
*/
import { LocationStrategy } from '@angular/common';
import {
booleanAttribute,
computed,
Directive,
DoCheck,
HostListener,
inject,
InjectionToken,
input,
OnChanges,
OnDestroy,
output,
signal
} from '@angular/core';
import { ActivatedRoute, NavigationEnd, NavigationExtras, Router, UrlTree } from '@angular/router';
import { injectSiTranslateService } from '@siemens/element-translate-ng/translate';
import { Subject } from 'rxjs';
import { filter, takeUntil } from 'rxjs/operators';
import { AriaCurrentType } from './aria-current.model';
import { Link } from './link.model';
import { SiLinkActionService } from './si-link-action.service';
export const SI_LINK_DEFAULT_NAVIGATION_EXTRA = new InjectionToken<NavigationExtras>(
'SI_LINK_DEFAULT_NAVIGATION_EXTRA'
);
@Directive({
selector: '[siLink]',
host: {
'[attr.href]': 'href()',
'[attr.target]': 'target()',
'[attr.title]': 'title()',
'[attr.aria-current]': 'isAriaCurrent()',
'[class]': 'active() ? activeClass() : null'
},
exportAs: 'siLink'
})
export class SiLinkDirective implements DoCheck, OnChanges, OnDestroy {
readonly siLink = input<Link>();
readonly siLinkDefaultTarget = input<string>();
readonly actionParam = input<any>();
readonly activeClass = input<string>();
/** @defaultValue false */
readonly exactMatch = input(false, { transform: booleanAttribute });
/**
* Type for `aria-current` to set if routerLink is active.
*/
readonly ariaCurrent = input<AriaCurrentType>();
readonly activeChange = output<boolean>();
protected readonly href = signal<string | undefined>(undefined);
protected readonly target = signal<string | undefined>(undefined);
protected readonly title = signal<string | undefined>(undefined);
protected readonly isAriaCurrent = computed(() =>
this.active() ? (this.ariaCurrent() ?? 'true') : undefined
);
/** @defaultValue false */
readonly active = signal(false);
private readonly destroyer = new Subject<void>();
private router = inject(Router, { optional: true });
private activatedRoute = inject(ActivatedRoute, { optional: true });
private locationStrategy = inject(LocationStrategy, { optional: true });
private translateService = injectSiTranslateService();
private actionService = inject(SiLinkActionService, { optional: true });
private defaultNavigationExtra = inject(SI_LINK_DEFAULT_NAVIGATION_EXTRA, { optional: true });
private get urlTree(): UrlTree {
const link = this.siLink()!.link;
return this.router!.createUrlTree(
Array.isArray(link!) ? link! : [link!],
this.navigationExtras
);
}
private get navigationExtras(): NavigationExtras {
return {
relativeTo: this.activatedRoute,
preserveFragment: true,
queryParamsHandling: 'merge',
...this.defaultNavigationExtra,
...this.siLink()!.navigationExtras
};
}
ngOnDestroy(): void {
this.destroyer.next();
this.destroyer.complete();
}
ngOnChanges(): void {
const siLink = this.siLink();
if (!siLink) {
this.href.set(undefined);
return;
}
this.destroyer.next();
if (siLink.tooltip) {
this.translateService
.translateAsync(siLink.tooltip)
.pipe(takeUntil(this.destroyer))
.subscribe(text => this.title.set(text));
}
if (siLink.action) {
this.href.set('');
} else if (siLink.link) {
this.subscribeRouter();
} else if (siLink.href) {
this.href.set(siLink.href);
this.target.set(siLink.target ?? this.siLinkDefaultTarget());
} else {
// In case the siLink has no link, href or action,
// we remove the href to avoid the mouse pointer.
this.href.set(undefined);
}
}
ngDoCheck(): void {
// this deep-checks if isActive has changed. It then updates the internal state and emits the event
// to be symmetric with the router-link case. queueMicroTask avoids "Expression has changed after it was checked" errors
const siLink = this.siLink();
if (
siLink &&
!siLink.link &&
siLink.isActive !== undefined &&
this.active() !== siLink.isActive
) {
this.active.set(siLink.isActive);
queueMicrotask(() => {
this.activeChange.emit(this.active());
});
}
}
private subscribeRouter(): void {
if (!this.router || !this.activatedRoute) {
return;
}
// Initial check
this.updateActiveByRouter();
this.router.events
.pipe(
takeUntil(this.destroyer),
filter(e => e instanceof NavigationEnd)
)
.subscribe(() => this.updateActiveByRouter());
}
private updateActiveByRouter(): void {
const urlTree = this.urlTree;
this.active.set(
this.siLink()!.isActive ??
this.router!.isActive(
urlTree,
this.exactMatch()
? {
queryParams: 'exact',
matrixParams: 'exact',
paths: 'exact',
fragment: 'exact'
}
: {
paths: 'subset',
queryParams: 'subset',
fragment: 'ignored',
matrixParams: 'ignored'
}
)
);
this.href.set(this.locationStrategy!.prepareExternalUrl(this.router!.serializeUrl(urlTree)));
}
@HostListener('click', ['$event'])
onClick(event: any): void {
const siLink = this.siLink();
if (siLink?.action) {
event.preventDefault();
const actionParam = this.actionParam();
if (typeof siLink.action === 'string') {
this.actionService?.emit(siLink, this.actionParam());
} else if (actionParam === undefined) {
siLink.action();
} else {
siLink.action(actionParam);
}
return;
}
// ignore regular links, allow user to open links in new tab or window
Iif (
!siLink ||
siLink.href ||
event.button > 0 ||
event.ctrlKey ||
event.metaKey ||
event.shiftKey
) {
return;
}
event.preventDefault();
// We have links without any action, href or link. For example grouping navbar items that hold a
// dropdown with links. That is why we need to check if the link property is set.
if (siLink.link && this.router) {
this.router.navigateByUrl(this.urlTree, this.navigationExtras);
}
}
}
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