dillonkearns/elm-pages-v3-beta
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Make sure anchor headings are scrolled into view on page render.

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This commit is contained in:
Dillon Kearns 2019-09-22 15:51:22 -07:00
parent 1f6dbb8742
commit 3d3588455d
1 changed files with 11 additions and 0 deletions
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11
index.js
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@ -3,6 +3,7 @@ const elmPagesVersion = require("./package.json").version;
module.exports = function pagesInit( module.exports = function pagesInit(
/** @type { { mainElmModule: { init: any } } } */ { mainElmModule } /** @type { { mainElmModule: { init: any } } } */ { mainElmModule }
) { ) {
const initialLocationHash = document.location.hash.replace(/^#/, "");
let prefetchedPages = [window.location.pathname]; let prefetchedPages = [window.location.pathname];
document.addEventListener("DOMContentLoaded", function() { document.addEventListener("DOMContentLoaded", function() {
@ -40,10 +41,20 @@ module.exports = function pagesInit(
}); });
} }
function loadNamedAnchor() {
if (initialLocationHash !== "") {
const namedAnchor = document.querySelector(
`[name=${initialLocationHash}]`
);
namedAnchor && namedAnchor.scrollIntoView();
}
}
function observeFirstRender( function observeFirstRender(
/** @type {MutationRecord[]} */ mutationList, /** @type {MutationRecord[]} */ mutationList,
/** @type {MutationObserver} */ firstRenderObserver /** @type {MutationObserver} */ firstRenderObserver
) { ) {
loadNamedAnchor();
for (let mutation of mutationList) { for (let mutation of mutationList) {
if (mutation.type === "childList") { if (mutation.type === "childList") {
setupLinkPrefetchingHelp(); setupLinkPrefetchingHelp();