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feat: update metadata fields from the challenger content #24

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feat: update metadata fields from the challenger content #24

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4c3300a
feat: update metadata fields from the challenger content
shsteimer May 7, 2024
3d452b1
update docs, default meta overrides to none so it's not a breaking ch…
shsteimer May 7, 2024
9327dea
Merge branch 'main' into metadata-overwrite
ramboz Nov 13, 2024
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3 changes: 3 additions & 0 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -160,6 +160,9 @@ runEager.call(document, {
// short durations of those campaigns/experiments
rumSamplingRate: 10,

// these metadata fields will be updated when replacing content
overrideMetaFields: ['template', 'theme'],

// the storage type used to persist data between page views
// (for instance to remember what variant in an experiment the user was served)
storage: window.SessionStorage,
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26 changes: 19 additions & 7 deletions src/index.js
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Expand Up @@ -14,6 +14,7 @@ const MAX_SAMPLING_RATE = 10; // At a maximum we sample 1 in 10 requests
export const DEFAULT_OPTIONS = {
// Generic properties
rumSamplingRate: MAX_SAMPLING_RATE, // 1 in 10 requests
overrideMetaFields: [],
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I considered defaulting this to ['template', 'theme'] but reverted to empty to avoid this being a breaking change. If we aren't concerned about a breaking change, I think the list above is reasonably safe and should cover most cases where metadata affects rendering of the page


// Audiences related properties
audiences: {},
Expand Down Expand Up @@ -73,12 +74,13 @@ export async function getResolvedAudiences(applicableAudiences, options, context
}

/**
* Replaces element with content from path
* Replaces main content from path
* @param {string} path
* @param {HTMLElement} main
* @param {Document} doc
* @param {string[]} overrideMetaFields
* @return Returns the path that was loaded or null if the loading failed
*/
async function replaceInner(path, main) {
async function replaceContent(path, doc, overrideMetaFields) {
try {
const resp = await fetch(path);
if (!resp.ok) {
Expand All @@ -91,7 +93,17 @@ async function replaceInner(path, main) {
const dom = new DOMParser().parseFromString(html, 'text/html');
// do not use replaceWith API here since this would replace the main reference
// in scripts.js as well and prevent proper decoration of the sections/blocks
main.innerHTML = dom.querySelector('main').innerHTML;
doc.querySelector('main').innerHTML = dom.querySelector('main').innerHTML;

// replace metadata fields
overrideMetaFields.forEach((metadataPropName) => {
const attr = metadataPropName && metadataPropName.includes(':') ? 'property' : 'name';
const newMetas = dom.head.querySelectorAll(`meta[${attr}="${metadataPropName}"]`);
const oldMetas = doc.head.querySelectorAll(`meta[${attr}="${metadataPropName}"]`);
oldMetas.forEach((m) => m.remove());
newMetas.forEach((m) => doc.head.append(m));
});

return path;
} catch (e) {
// eslint-disable-next-line no-console
Expand Down Expand Up @@ -464,7 +476,7 @@ export async function runExperiment(document, options, context) {
document.body.classList.add(`experiment-${context.toClassName(experimentConfig.id)}`);
let result;
if (pages[index] !== currentPath) {
result = await replaceInner(pages[index], document.querySelector('main'));
result = await replaceContent(pages[index], document, pluginOptions.overrideMetaFields);
} else {
result = currentPath;
}
Expand Down Expand Up @@ -523,7 +535,7 @@ export async function runCampaign(document, options, context) {

try {
const url = new URL(urlString);
const result = await replaceInner(url.pathname, document.querySelector('main'));
const result = await replaceContent(url.pathname, document, pluginOptions.overrideMetaFields);
window.hlx.campaign.servedExperience = result || window.location.pathname;
if (!result) {
// eslint-disable-next-line no-console
Expand Down Expand Up @@ -577,7 +589,7 @@ export async function serveAudience(document, options, context) {

try {
const url = new URL(urlString);
const result = await replaceInner(url.pathname, document.querySelector('main'));
const result = await replaceContent(url.pathname, document, pluginOptions.overrideMetaFields);
window.hlx.audience.servedExperience = result || window.location.pathname;
if (!result) {
// eslint-disable-next-line no-console
Expand Down