dillonkearns/elm-pages-v3-beta
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Use MutationObserver to listen for first render and url change render completions.

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This commit is contained in:
Dillon Kearns 2019-09-14 21:06:13 -07:00
parent 6559dbbf00
commit f544a9c8bc
1 changed files with 43 additions and 20 deletions
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63
index.js
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@ -7,16 +7,12 @@ module.exports = function pagesInit({ mainElmModule }) {
});
app.ports.toJsPort.subscribe(payload => {
if (payload.event === "page-changed") {
setupLinkPrefetching();
if (navigator.userAgent.indexOf("Headless") >= 0) {
headTags.forEach(headTag => {
appendTag(headTag);
});
} else {
if (navigator.userAgent.indexOf("Headless") >= 0) {
headTags.forEach(headTag => {
appendTag(headTag);
});
} else {
setupLinkPrefetching();
}
setupLinkPrefetching();
}
document.dispatchEvent(new Event("prerender-trigger"));
@ -24,14 +20,48 @@ module.exports = function pagesInit({ mainElmModule }) {
});
function setupLinkPrefetching() {
setTimeout(setupLinkPrefetchingHelp, 1000);
new MutationObserver(observeFirstRender).observe(document.body, {
attributes: true,
childList: true,
subtree: true
});
}
function setupLinkPrefetchingHelp() {
console.log("Setting up link hover prefetches...");
function observeFirstRender(mutationList, firstRenderObserver) {
for (let mutation of mutationList) {
if (mutation.type === "childList") {
console.log(
"Setting up prefetch links for ",
mutation.target.attributes["data-url"]
);
setupLinkPrefetchingHelp();
}
}
firstRenderObserver.disconnect();
new MutationObserver(observeUrlChanges).observe(document.body.children[0], {
attributes: true,
childList: false,
subtree: false
});
}
function observeUrlChanges(mutationList, theObserver) {
for (let mutation of mutationList) {
if (mutation.type === "attributes") {
console.log(
"Setting up prefetch links for ",
mutation.target.attributes["data-url"]
);
setupLinkPrefetchingHelp();
}
}
}
function setupLinkPrefetchingHelp(mutationList, theObserver) {
const links = document.querySelectorAll("a");
console.log("links", links);
window.links = links;
console.log("LINKS");
links.forEach(link => {
console.log(link.pathname);
link.addEventListener("mouseenter", function(event) {
if (event && event.target) {
prefetchIfNeeded(event.target);
@ -51,13 +81,6 @@ module.exports = function pagesInit({ mainElmModule }) {
console.log("Preloading...", target.pathname);
const link = document.createElement("link");
link.setAttribute("rel", "prefetch");
console.log(
origin,
" + ",
"content.txt",
" = ",
origin + target.pathname + "/content.txt"
);
link.setAttribute("href", origin + target.pathname + "/content.txt");
document.head.appendChild(link);
}