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| 1 | +// Show recent release notes first, with older notes available on the same page. |
| 2 | +// All notes remain in the HTML for documentation search, printing, and readers |
| 3 | +// without JavaScript. Existing release links reveal their target automatically. |
| 4 | +window.addEventListener("DOMContentLoaded", function () { |
| 5 | + var releaseHistory = document.getElementById("release-history"); |
| 6 | + if (!releaseHistory) { |
| 7 | + return; |
| 8 | + } |
| 9 | + |
| 10 | + var releaseSections = Array.from(releaseHistory.children).filter(function (element) { |
| 11 | + return element.tagName === "SECTION"; |
| 12 | + }); |
| 13 | + var releasesPerPage = 10; |
| 14 | + if (releaseSections.length <= releasesPerPage) { |
| 15 | + return; |
| 16 | + } |
| 17 | + |
| 18 | + var visibleReleaseCount = releasesPerPage; |
| 19 | + var contentsLinks = Array.from(document.querySelectorAll(".toc-tree a")); |
| 20 | + var navigation = document.createElement("div"); |
| 21 | + navigation.className = "release-history-navigation"; |
| 22 | + var jumpLabel = document.createElement("label"); |
| 23 | + jumpLabel.htmlFor = "release-history-version"; |
| 24 | + jumpLabel.textContent = "Jump to a release"; |
| 25 | + navigation.appendChild(jumpLabel); |
| 26 | + var releaseSelector = document.createElement("select"); |
| 27 | + releaseSelector.id = "release-history-version"; |
| 28 | + var placeholder = document.createElement("option"); |
| 29 | + placeholder.value = ""; |
| 30 | + placeholder.textContent = "Select a release"; |
| 31 | + releaseSelector.appendChild(placeholder); |
| 32 | + releaseSections.forEach(function (section) { |
| 33 | + var option = document.createElement("option"); |
| 34 | + option.value = section.id; |
| 35 | + option.textContent = section.querySelector("h2").firstChild.textContent.trim(); |
| 36 | + releaseSelector.appendChild(option); |
| 37 | + }); |
| 38 | + navigation.appendChild(releaseSelector); |
| 39 | + releaseHistory.insertBefore(navigation, releaseSections[0]); |
| 40 | + |
| 41 | + var controls = document.createElement("div"); |
| 42 | + controls.className = "release-history-controls"; |
| 43 | + controls.setAttribute("role", "group"); |
| 44 | + controls.setAttribute("aria-label", "Older release notes"); |
| 45 | + |
| 46 | + var status = document.createElement("p"); |
| 47 | + status.setAttribute("role", "status"); |
| 48 | + status.setAttribute("aria-live", "polite"); |
| 49 | + controls.appendChild(status); |
| 50 | + |
| 51 | + var showMoreButton = document.createElement("button"); |
| 52 | + showMoreButton.type = "button"; |
| 53 | + showMoreButton.textContent = "Show 10 more releases"; |
| 54 | + controls.appendChild(showMoreButton); |
| 55 | + |
| 56 | + var showAllButton = document.createElement("button"); |
| 57 | + showAllButton.type = "button"; |
| 58 | + showAllButton.textContent = "Show all releases"; |
| 59 | + controls.appendChild(showAllButton); |
| 60 | + releaseHistory.appendChild(controls); |
| 61 | + |
| 62 | + function updateVisibleReleases() { |
| 63 | + releaseSections.forEach(function (section, index) { |
| 64 | + section.hidden = index >= visibleReleaseCount; |
| 65 | + }); |
| 66 | + contentsLinks.forEach(function (link) { |
| 67 | + var section = document.getElementById(link.hash.slice(1)); |
| 68 | + var item = link.closest("li"); |
| 69 | + if (section && releaseSections.indexOf(section) !== -1 && item) { |
| 70 | + item.hidden = section.hidden; |
| 71 | + } |
| 72 | + }); |
| 73 | + var remainingReleaseCount = releaseSections.length - visibleReleaseCount; |
| 74 | + status.textContent = "Showing " + visibleReleaseCount + " of " + |
| 75 | + releaseSections.length + " release entries."; |
| 76 | + var nextReleaseCount = Math.min(releasesPerPage, remainingReleaseCount); |
| 77 | + showMoreButton.textContent = "Show " + nextReleaseCount + " more " + |
| 78 | + (nextReleaseCount === 1 ? "release" : "releases"); |
| 79 | + showMoreButton.hidden = remainingReleaseCount === 0; |
| 80 | + showAllButton.hidden = remainingReleaseCount === 0; |
| 81 | + } |
| 82 | + |
| 83 | + function showOlderReleases(count) { |
| 84 | + var firstNewSection = releaseSections[visibleReleaseCount]; |
| 85 | + visibleReleaseCount = Math.min(count, releaseSections.length); |
| 86 | + updateVisibleReleases(); |
| 87 | + // Move keyboard focus to the newly revealed notes, rather than leaving |
| 88 | + // it on a button that moved below them or disappeared after "Show all". |
| 89 | + var heading = firstNewSection.querySelector("h2"); |
| 90 | + heading.setAttribute("tabindex", "-1"); |
| 91 | + heading.focus({ preventScroll: true }); |
| 92 | + heading.scrollIntoView({ block: "start" }); |
| 93 | + } |
| 94 | + |
| 95 | + function revealLinkedRelease() { |
| 96 | + var targetId; |
| 97 | + try { |
| 98 | + targetId = decodeURIComponent(window.location.hash.slice(1)); |
| 99 | + } catch (error) { |
| 100 | + return; |
| 101 | + } |
| 102 | + var target = document.getElementById(targetId); |
| 103 | + var releaseIndex = releaseSections.findIndex(function (section) { |
| 104 | + return target && section.contains(target); |
| 105 | + }); |
| 106 | + if (releaseIndex === -1) { |
| 107 | + return; |
| 108 | + } |
| 109 | + releaseSelector.value = releaseSections[releaseIndex].id; |
| 110 | + if (releaseIndex >= visibleReleaseCount) { |
| 111 | + visibleReleaseCount = Math.min(releaseSections.length, |
| 112 | + Math.ceil((releaseIndex + 1) / releasesPerPage) * releasesPerPage); |
| 113 | + updateVisibleReleases(); |
| 114 | + } |
| 115 | + target.scrollIntoView({ block: "start" }); |
| 116 | + } |
| 117 | + |
| 118 | + showMoreButton.addEventListener("click", function () { |
| 119 | + showOlderReleases(visibleReleaseCount + releasesPerPage); |
| 120 | + }); |
| 121 | + showAllButton.addEventListener("click", function () { |
| 122 | + showOlderReleases(releaseSections.length); |
| 123 | + }); |
| 124 | + releaseSelector.addEventListener("change", function () { |
| 125 | + if (releaseSelector.value) { |
| 126 | + var releaseHash = "#" + releaseSelector.value; |
| 127 | + window.location.hash = releaseHash; |
| 128 | + revealLinkedRelease(); |
| 129 | + } |
| 130 | + }); |
| 131 | + window.addEventListener("hashchange", revealLinkedRelease); |
| 132 | + updateVisibleReleases(); |
| 133 | + revealLinkedRelease(); |
| 134 | +}); |
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