73 lines
No EOL
2.3 KiB
JavaScript
73 lines
No EOL
2.3 KiB
JavaScript
// only allows the script to execute once
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if (typeof showNewCommentCounts === 'undefined') {
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// localstorage comment counts format: {"<postId>": {c: <totalComments>, t: <timestampUpdated>}}
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const COMMENT_COUNTS_ID = "comment-counts"
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/**
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* Display the number of new comments present since the last time the post was opened
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*/
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function showNewCommentCounts(postId, newTotal) {
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const comments = JSON.parse(localStorage.getItem(COMMENT_COUNTS_ID)) || {}
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const lastCount = comments[postId]
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if (lastCount) {
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const newComments = newTotal - lastCount.c
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if (newComments > 0) {
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document.querySelectorAll(`#post-${postId} .new-comments`).forEach(elem => {
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elem.textContent = ` (+${newComments})`
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elem.classList.remove("d-none")
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})
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}
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}
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}
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/**
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* Saves the comment count to the localStorage
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*
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* @param postId The id of the post associated with the comments
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* @param lastTotalComs The new amount, If null it will just increment the previous amount
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*/
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function saveCommentsCount(postId, lastTotalComs = null) {
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const comments = JSON.parse(localStorage.getItem(COMMENT_COUNTS_ID)) || {}
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const newTotal = lastTotalComs || ((comments[postId] || { c: 0 }).c + 1)
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comments[postId] = { c: newTotal, t: Date.now() }
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window.localStorage.setItem(COMMENT_COUNTS_ID, JSON.stringify(comments))
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}
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/**
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* Cleans the expired entries (5 days). It runs every hour.
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*/
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function cleanCommentsCache() {
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const LAST_CACHE_CLEAN_ID = "last-cache-clean"
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const EXPIRE_INTERVAL_MILLIS = 5 * 24 * 60 * 60 * 1000
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const CACHE_CLEAN_INTERVAL = 60 * 60 * 1000 // 1 hour
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function cleanCache() {
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const lastCacheClean = JSON.parse(localStorage.getItem(LAST_CACHE_CLEAN_ID)) || Date.now()
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const now = Date.now()
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if (now - lastCacheClean > CACHE_CLEAN_INTERVAL) {
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const comments = JSON.parse(localStorage.getItem(COMMENT_COUNTS_ID)) || {}
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for (let [key, value] of Object.entries(comments)) {
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if (now - value.t > EXPIRE_INTERVAL_MILLIS) {
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delete comments[key]
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}
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}
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window.localStorage.setItem(COMMENT_COUNTS_ID, JSON.stringify(comments))
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}
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window.localStorage.setItem(LAST_CACHE_CLEAN_ID, JSON.stringify(now))
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}
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// So it does not slow the load of the main page with the clean up
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setTimeout(cleanCache, 500)
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}
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cleanCommentsCache()
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} |