Highlight Zombie Posts

Highlights old posts in SDMB vBulletin board (or other compatible boards).

As of 21. 03. 2016. See the latest version.

You will need to install an extension such as Tampermonkey, Greasemonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey or Userscripts to install this script.

You will need to install an extension such as Tampermonkey to install this script.

You will need to install a user script manager extension to install this script.

(I already have a user script manager, let me install it!)

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

(I already have a user style manager, let me install it!)

// ==UserScript==
// @name        Highlight Zombie Posts
// @namespace   SDMB_HighlightPosts
// @version     0.5.0
// @description Highlights old posts in SDMB vBulletin board (or other compatible boards).
// @author      TroutMan
// @include     http://boards.straightdope.com/sdmb/showthread.php*
// @require     http://code.jquery.com/jquery-2.1.1.min.js
// @grant       GM_addStyle
// ==/UserScript==

// Change colors/age if desired (age in months)
var age1 = 3;
var highlightColor1 = 'LemonChiffon';
var textColor1 = 'DarkSlateGray';
var age2 = 6;
var highlightColor2 = 'Gold';
var textColor2 = 'Black';
var age3 = 12;
var highlightColor3 = 'DarkOrange';
var textColor3 = 'Black';
var age4 = 36;
var highlightColor4 = 'Crimson';
var textColor4 = 'White';

HighlightPosts();

function HighlightPosts()
{
    var curDate = new Date();

    // get all <td> elements containing the date
    var allElements = document.evaluate(
        './/table[contains(@id,"post")]/tbody/tr/td[@class="thead"]/div[2]',
        document.body,
        null,
        XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE,
        null);
    
    for (var i = 0; i < allElements.snapshotLength; i++) {
        var thisElement = allElements.snapshotItem(i);
        var dateText = thisElement.textContent.trim();
        
        // date is mm-dd-yyyy, need to put in ISO order so works in all locales.
        // We're ignoring time and UTC conversion which might put us off by a day, but we don't care
        var dateParts = dateText.substr(0,10).split('-');
        var d1 = new Date(dateParts[2],dateParts[0]-1,dateParts[1]); 
        
        if (isNaN(d1)) {
            // do nothing - it's probably "today" or "yesterday"
        }
        else {
            // get difference in months
            var mDiff = (curDate.getFullYear() - d1.getFullYear()) * 12 + (curDate.getMonth() - d1.getMonth()) - (curDate.getDate() >= d1.getDate() ? 0 : 1);

            if (mDiff < age1) {
                // do nothing - most common scenario, so short-circuit here to avoid more checks
            }
            else if (mDiff < age2) {
                // format color 1
                thisElement.parentNode.style.backgroundColor = highlightColor1;
                thisElement.parentNode.style.color = textColor1;
            }
            else if (mDiff < age3) {
                // format color 2
                thisElement.parentNode.style.backgroundColor = highlightColor2;
                thisElement.parentNode.style.color = textColor2;
            }
            else if (mDiff < age4) {
                // format color 3
                thisElement.parentNode.style.backgroundColor = highlightColor3;
                thisElement.parentNode.style.color = textColor3;
            }
            else {
                // format color 4
                thisElement.parentNode.style.backgroundColor = highlightColor4;
                thisElement.parentNode.style.color = textColor4;
            }
        }
    }
}