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Preserve child head content in HTMX embeds

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Your Name 2026-08-06 17:41:16 -04:00
parent c8e50cb629
commit cda04f48ed
1 changed files with 23 additions and 9 deletions
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32
index.js
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@ -416,15 +416,32 @@ function decoratePage(html, { headInjection, source } = {}) {
return $.html();
}
// HTMX partial: stamp provenance on the swapped-in elements (an oob swap loses
// its own attrs, so we descend into its children) and append an out-of-band
// <head> so head injection still reaches the page.
// Carry rendered head content through HTMX with a neutral OOB wrapper. A
// literal <head> in an HTMX response is discarded by the browser's fragment
// parser, and HTMX does not discover a top-level <style hx-swap-oob>. The div
// survives long enough for HTMX to append its children to the host's real
// #head; the browser then keeps the valid style/link/meta children there.
function headOobSwaps(headHtml, headInjection) {
const $ = cheerio.load(
`<head>${headHtml || ""}${headInjection || ""}</head>`,
);
const contents = $("head").html();
return contents ? `<div hx-swap-oob="beforeend:#head">${contents}</div>` : "";
}
// HTMX partial: stamp provenance on the swapped-in body elements (an OOB swap
// loses its own attrs, so we descend into its children), then carry the child
// structure's rendered head and configured head injection into the host page.
function decorateFragment(html, { headInjection, source } = {}) {
const $ = cheerio.load(html, null, false);
// Parse as a document so browser-valid top-level styles and links are
// collected into head. `cheerio.load(..., null, false)` leaves those nodes as
// fragment siblings, which makes them get swapped into body and not apply.
const $ = cheerio.load(html);
const body = $("body");
const attrs = blissAttrs(source);
if (attrs) {
const targets = [];
for (const child of $.root().children()) {
for (const child of body.children()) {
if (child.attribs && child.attribs["hx-swap-oob"]) {
for (const grandchild of child.children) {
if (grandchild.attribs) targets.push(grandchild);
@ -435,10 +452,7 @@ function decorateFragment(html, { headInjection, source } = {}) {
}
for (const target of targets) Object.assign(target.attribs, attrs);
}
return (
$.html() +
`<head id="head" hx-oob-swap="beforeend">${headInjection || ""}</head>`
);
return body.html() + headOobSwaps($("head").html(), headInjection);
}
// `res.render()` commonly returns a complete document even when it is serving