import {scrollAndHighlightElement} from '../services/util';
import {Component} from './component';
+function toggleAnchorHighlighting(elementId, shouldHighlight) {
+ DOM.forEach(`a[href="#${elementId}"]`, anchor => {
+ anchor.closest('li').classList.toggle('current-heading', shouldHighlight);
+ });
+}
+
+function headingVisibilityChange(entries) {
+ for (const entry of entries) {
+ const isVisible = (entry.intersectionRatio === 1);
+ toggleAnchorHighlighting(entry.target.id, isVisible);
+ }
+}
+
+function addNavObserver(headings) {
+ // Setup the intersection observer.
+ const intersectOpts = {
+ rootMargin: '0px 0px 0px 0px',
+ threshold: 1.0,
+ };
+ const pageNavObserver = new IntersectionObserver(headingVisibilityChange, intersectOpts);
+
+ // observe each heading
+ for (const heading of headings) {
+ pageNavObserver.observe(heading);
+ }
+}
+
export class PageDisplay extends Component {
setup() {
if (headings.length > 0 && pageNav !== null) {
addNavObserver(headings);
}
-
- function addNavObserver(headings) {
- // Setup the intersection observer.
- const intersectOpts = {
- rootMargin: '0px 0px 0px 0px',
- threshold: 1.0,
- };
- const pageNavObserver = new IntersectionObserver(headingVisibilityChange, intersectOpts);
-
- // observe each heading
- for (const heading of headings) {
- pageNavObserver.observe(heading);
- }
- }
-
- function headingVisibilityChange(entries, observer) {
- for (const entry of entries) {
- const isVisible = (entry.intersectionRatio === 1);
- toggleAnchorHighlighting(entry.target.id, isVisible);
- }
- }
-
- function toggleAnchorHighlighting(elementId, shouldHighlight) {
- DOM.forEach(`a[href="#${elementId}"]`, anchor => {
- anchor.closest('li').classList.toggle('current-heading', shouldHighlight);
- });
- }
}
setupDetailsCodeBlockRefresh() {