@cisstech/nge
Version:
NG Essentials is a collection of libraries for Angular developers.
135 lines • 19 kB
JavaScript
import { Directive, ElementRef, Input } from '@angular/core';
import { Scroll } from '@angular/router';
import * as i0 from "@angular/core";
import * as i1 from "@angular/router";
import * as i2 from "@angular/common";
export class NgeDocTocDirective {
constructor(router, location, elementRef, activatedRoute) {
this.router = router;
this.location = location;
this.elementRef = elementRef;
this.activatedRoute = activatedRoute;
this.subscriptions = [];
this.observer = new MutationObserver(() => {
this.observer?.disconnect();
this.build();
});
this.anchors = [];
this.subscriptions.push(this.router.events.subscribe((event) => {
if (event instanceof Scroll && event.anchor) {
this.scroll(event.anchor);
}
}));
}
ngOnDestroy() {
this.intersection?.disconnect();
this.subscriptions.forEach((s) => s.unsubscribe());
}
ngOnChanges() {
this.build();
}
build() {
this.clear();
if (!this.component) {
return;
}
const componentNode = this.component.injector.get(ElementRef).nativeElement;
const tocContainer = this.elementRef.nativeElement;
const h2Nodes = Array.from(componentNode.children).filter((node) => {
return node.tagName === 'H2' && node.parentNode?.isSameNode(componentNode);
});
this.detectIntersection();
const ul = document.createElement('ul');
h2Nodes.forEach((h2) => {
const id = this.dashify(h2.textContent || '');
const target = document.createElement('span');
target.id = id;
h2.insertAdjacentElement('afterend', target);
const li = document.createElement('li');
const anchor = document.createElement('a');
anchor.innerHTML = h2.innerHTML;
// .substring(1) will remove the leading / (prevent errors when baseHref is defined in index.html)
anchor.href = this.location.path().substring(1) + '#' + id;
li.appendChild(anchor);
ul.appendChild(li);
h2.setAttribute('data-toc-id', id);
li.setAttribute('data-toc-id', id);
this.anchors.push(li);
this.intersection?.observe(h2);
});
tocContainer.appendChild(ul);
const { fragment } = this.activatedRoute.snapshot;
if (fragment) {
this.scroll(fragment);
}
this.observer.observe(componentNode, {
childList: true,
subtree: true,
});
}
dashify(input) {
return input
.trim()
.replace(/([a-z])([A-Z])/g, '$1-$2')
.replace(/\W/g, (m) => (/[À-ž]/.test(m) ? m : '-'))
.replace(/^-+|-+$/g, '')
.replace(/-{2,}/g, (m) => '-') // Condense multiple consecutive dashes to one.
.toLowerCase();
}
detectIntersection() {
const tocContainer = this.elementRef.nativeElement;
const rect = tocContainer.getBoundingClientRect();
const bottom = -window.innerHeight + rect.y + 200;
this.intersection?.disconnect();
this.intersection = new IntersectionObserver((entries) => {
entries.forEach((entry) => {
if (entry.isIntersecting) {
this.anchors.forEach((anchor) => {
anchor.classList.remove('active');
const a = anchor.getAttribute('data-toc-id');
const b = entry.target.getAttribute('data-toc-id');
if (a === b) {
anchor.classList.add('active');
}
});
}
});
}, {
// A BOX OF 200px STARTING AT THE POSITION OF THE TOC ELEMENT
rootMargin: `0px 0px ${bottom}px 0px`,
});
}
clear() {
const tocContainer = this.elementRef.nativeElement;
tocContainer.innerHTML = '';
this.observer.disconnect();
this.intersection?.disconnect();
this.anchors = [];
}
scroll(query) {
const targetElement = document.querySelector(`h2[data-toc-id="${query}"]`);
if (!targetElement) {
window.scrollTo(0, 0);
}
else if (!this.isInViewport(targetElement)) {
targetElement.scrollIntoView();
}
}
isInViewport(elem) {
const bounding = elem.getBoundingClientRect();
return (bounding.top >= 0 &&
bounding.left >= 0 &&
bounding.bottom <= (window.innerHeight || document.documentElement.clientHeight) &&
bounding.right <= (window.innerWidth || document.documentElement.clientWidth));
}
static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "18.2.1", ngImport: i0, type: NgeDocTocDirective, deps: [{ token: i1.Router }, { token: i2.Location }, { token: i0.ElementRef }, { token: i1.ActivatedRoute }], target: i0.ɵɵFactoryTarget.Directive }); }
static { this.ɵdir = i0.ɵɵngDeclareDirective({ minVersion: "14.0.0", version: "18.2.1", type: NgeDocTocDirective, selector: "[ngeDocToc]", inputs: { component: ["ngeDocToc", "component"] }, usesOnChanges: true, ngImport: i0 }); }
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "18.2.1", ngImport: i0, type: NgeDocTocDirective, decorators: [{
type: Directive,
args: [{ selector: '[ngeDocToc]' }]
}], ctorParameters: () => [{ type: i1.Router }, { type: i2.Location }, { type: i0.ElementRef }, { type: i1.ActivatedRoute }], propDecorators: { component: [{
type: Input,
args: ['ngeDocToc']
}] } });
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{ Location } from '@angular/common'\nimport { ComponentRef, Directive, ElementRef, Input, OnChanges, OnDestroy } from '@angular/core'\nimport { ActivatedRoute, Router, Scroll } from '@angular/router'\nimport { Subscription } from 'rxjs'\n\n@Directive({ selector: '[ngeDocToc]' })\nexport class NgeDocTocDirective implements OnDestroy, OnChanges {\n  private readonly subscriptions: Subscription[] = []\n  private readonly observer = new MutationObserver(() => {\n    this.observer?.disconnect()\n    this.build()\n  })\n\n  private intersection?: IntersectionObserver\n  private anchors: HTMLElement[] = []\n\n  @Input('ngeDocToc')\n  component?: ComponentRef<any>\n\n  constructor(\n    private readonly router: Router,\n    private readonly location: Location,\n    private readonly elementRef: ElementRef<HTMLElement>,\n    private readonly activatedRoute: ActivatedRoute\n  ) {\n    this.subscriptions.push(\n      this.router.events.subscribe((event) => {\n        if (event instanceof Scroll && event.anchor) {\n          this.scroll(event.anchor)\n        }\n      })\n    )\n  }\n\n  ngOnDestroy(): void {\n    this.intersection?.disconnect()\n    this.subscriptions.forEach((s) => s.unsubscribe())\n  }\n\n  ngOnChanges(): void {\n    this.build()\n  }\n\n  private build(): void {\n    this.clear()\n\n    if (!this.component) {\n      return\n    }\n\n    const componentNode = this.component.injector.get(ElementRef).nativeElement as HTMLElement\n\n    const tocContainer = this.elementRef.nativeElement\n\n    const h2Nodes = Array.from(componentNode.children).filter((node) => {\n      return node.tagName === 'H2' && node.parentNode?.isSameNode(componentNode)\n    })\n\n    this.detectIntersection()\n\n    const ul = document.createElement('ul')\n    h2Nodes.forEach((h2) => {\n      const id = this.dashify(h2.textContent || '')\n      const target = document.createElement('span')\n      target.id = id\n      h2.insertAdjacentElement('afterend', target)\n\n      const li = document.createElement('li')\n      const anchor = document.createElement('a')\n      anchor.innerHTML = h2.innerHTML\n      // .substring(1) will remove the leading / (prevent errors when baseHref is defined in index.html)\n      anchor.href = this.location.path().substring(1) + '#' + id\n\n      li.appendChild(anchor)\n      ul.appendChild(li)\n\n      h2.setAttribute('data-toc-id', id)\n      li.setAttribute('data-toc-id', id)\n\n      this.anchors.push(li)\n\n      this.intersection?.observe(h2)\n    })\n\n    tocContainer.appendChild(ul)\n\n    const { fragment } = this.activatedRoute.snapshot\n    if (fragment) {\n      this.scroll(fragment)\n    }\n\n    this.observer.observe(componentNode, {\n      childList: true,\n      subtree: true,\n    })\n  }\n\n  private dashify(input: string): string {\n    return input\n      .trim()\n      .replace(/([a-z])([A-Z])/g, '$1-$2')\n      .replace(/\\W/g, (m) => (/[À-ž]/.test(m) ? m : '-'))\n      .replace(/^-+|-+$/g, '')\n      .replace(/-{2,}/g, (m) => '-') // Condense multiple consecutive dashes to one.\n      .toLowerCase()\n  }\n\n  private detectIntersection(): void {\n    const tocContainer = this.elementRef.nativeElement\n    const rect = tocContainer.getBoundingClientRect()\n    const bottom = -window.innerHeight + rect.y + 200\n\n    this.intersection?.disconnect()\n    this.intersection = new IntersectionObserver(\n      (entries) => {\n        entries.forEach((entry) => {\n          if (entry.isIntersecting) {\n            this.anchors.forEach((anchor) => {\n              anchor.classList.remove('active')\n              const a = anchor.getAttribute('data-toc-id')\n              const b = entry.target.getAttribute('data-toc-id')\n              if (a === b) {\n                anchor.classList.add('active')\n              }\n            })\n          }\n        })\n      },\n      {\n        // A BOX OF 200px STARTING AT THE POSITION OF THE TOC ELEMENT\n        rootMargin: `0px 0px ${bottom}px 0px`,\n      }\n    )\n  }\n\n  private clear(): void {\n    const tocContainer = this.elementRef.nativeElement\n    tocContainer.innerHTML = ''\n    this.observer.disconnect()\n    this.intersection?.disconnect()\n    this.anchors = []\n  }\n\n  private scroll(query: string): void {\n    const targetElement = document.querySelector(`h2[data-toc-id=\"${query}\"]`)\n    if (!targetElement) {\n      window.scrollTo(0, 0)\n    } else if (!this.isInViewport(targetElement)) {\n      targetElement.scrollIntoView()\n    }\n  }\n\n  private isInViewport(elem: any): boolean {\n    const bounding = elem.getBoundingClientRect()\n    return (\n      bounding.top >= 0 &&\n      bounding.left >= 0 &&\n      bounding.bottom <= (window.innerHeight || document.documentElement.clientHeight) &&\n      bounding.right <= (window.innerWidth || document.documentElement.clientWidth)\n    )\n  }\n}\n"]}