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@@ -0,0 +1,127 @@
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+
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+const dropdown = document.querySelector('.version-picker .dropdown');
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+const dropdownMenu = dropdown.querySelector('.dropdown-menu');
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+
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+fetchVersions(dropdown, dropdownMenu).then(() => {
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+ initializeVersionDropdown(dropdown, dropdownMenu);
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+});
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+
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+/**
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+ * Initialize the dropdown functionality for version selection.
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+ *
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+ * @param {Element} dropdown - The dropdown element.
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+ * @param {Element} dropdownMenu - The dropdown menu element.
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+ */
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+function initializeVersionDropdown(dropdown, dropdownMenu) {
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+ // Toggle the dropdown menu on click
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+ dropdown.addEventListener('click', function () {
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+ this.setAttribute('tabindex', 1);
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+ this.classList.toggle('active');
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+ dropdownMenu.style.display = (dropdownMenu.style.display === 'block') ? 'none' : 'block';
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+ });
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+
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+ // Remove the 'active' class and hide the dropdown menu on focusout
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+ dropdown.addEventListener('focusout', function () {
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+ this.classList.remove('active');
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+ dropdownMenu.style.display = 'none';
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+ });
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+
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+ // Handle item selection within the dropdown menu
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+ const dropdownMenuItems = dropdownMenu.querySelectorAll('li');
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+ dropdownMenuItems.forEach(function (item) {
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+ item.addEventListener('click', function () {
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+ dropdownMenuItems.forEach(function (item) {
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+ item.classList.remove('active');
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+ });
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+ this.classList.add('active');
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+ dropdown.querySelector('span').textContent = this.textContent;
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+ dropdown.querySelector('input').value = this.getAttribute('id');
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+
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+ window.location.href = changeVersion(window.location.href, this.textContent);
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+ });
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+ });
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+};
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+
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+/**
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+ * This function fetches the available versions from a GitHub repository
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+ * and inserts them into the version picker.
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+ *
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+ * @param {Element} dropdown - The dropdown element.
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+ * @param {Element} dropdownMenu - The dropdown menu element.
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+ * @returns {Promise<Array<string>>} A promise that resolves with an array of available versions.
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+ */
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+function fetchVersions(dropdown, dropdownMenu) {
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+ return new Promise((resolve, reject) => {
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+ window.addEventListener("load", () => {
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+
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+ fetch("https://api.github.com/repos/matrix-org/synapse/git/trees/gh-pages", {
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+ cache: "force-cache",
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+ }).then(res =>
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+ res.json()
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+ ).then(resObject => {
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+ const excluded = ['dev-docs', 'v1.91.0', 'v1.80.0', 'v1.69.0'];
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+ const tree = resObject.tree.filter(item => item.type === "tree" && !excluded.includes(item.path));
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+ const versions = tree.map(item => item.path).sort(sortVersions);
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+
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+ // Create a list of <li> items for versions
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+ versions.forEach((version) => {
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+ const li = document.createElement("li");
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+ li.textContent = version;
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+ li.id = version;
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+
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+ if (window.SYNAPSE_VERSION === version) {
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+ li.classList.add('active');
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+ dropdown.querySelector('span').textContent = version;
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+ dropdown.querySelector('input').value = version;
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+ }
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+
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+ dropdownMenu.appendChild(li);
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+ });
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+
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+ resolve(versions);
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+
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+ }).catch(ex => {
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+ console.error("Failed to fetch version data", ex);
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+ reject(ex);
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+ })
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+ });
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+ });
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+}
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+
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+/**
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+ * Custom sorting function to sort an array of version strings.
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+ *
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+ * @param {string} a - The first version string to compare.
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+ * @param {string} b - The second version string to compare.
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+ * @returns {number} - A negative number if a should come before b, a positive number if b should come before a, or 0 if they are equal.
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+ */
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+function sortVersions(a, b) {
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+ // Put 'develop' and 'latest' at the top
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+ if (a === 'develop' || a === 'latest') return -1;
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+ if (b === 'develop' || b === 'latest') return 1;
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+
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+ const versionA = (a.match(/v\d+(\.\d+)+/) || [])[0];
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+ const versionB = (b.match(/v\d+(\.\d+)+/) || [])[0];
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+
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+ return versionB.localeCompare(versionA);
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+}
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+
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+/**
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+ * Change the version in a URL path.
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+ *
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+ * @param {string} url - The original URL to be modified.
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+ * @param {string} newVersion - The new version to replace the existing version in the URL.
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+ * @returns {string} The updated URL with the new version.
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+ */
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+function changeVersion(url, newVersion) {
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+ const parsedURL = new URL(url);
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+ const pathSegments = parsedURL.pathname.split('/');
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+
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+ // Modify the version
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+ pathSegments[2] = newVersion;
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+
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+ // Reconstruct the URL
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+ parsedURL.pathname = pathSegments.join('/');
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+
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+ return parsedURL.href;
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+}
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