Provides hotkey support for piazza. Paste into the Chrome Dev Console for use.

piazza_hotkeys.js

var piazza_hotkeys = function() {
    /*
     Provides hotkey support for navigating many posts on piazza.
        1) a + alt: archives the current post and navigates to the previous post
        2) i + alt: marks the current post as unread and navigates to the previous post
        3) up + alt: navigates to the more recent post from current
        4) down + alt: navigates to the older post
    */
    // keycodes: https://css-tricks.com/snippets/javascript/javascript-keycodes/
    const A = 65;
    const I = 73;
    const up = 38;
    const down = 40;
    const getSelected = function() {
        s = document.querySelectorAll("li.selected");
        return s.length > 0 ? s[0] : null;
    };
    document.addEventListener("keydown", function(event) {
        const code = event.keyCode;
        const alt = event.altKey;
        if ( (code == A || code == I) && alt)  { // alt key is pressed
            var split = window.location.search.split("=");
            var questionID = split.length > 1 ? split[split.length - 1] : "?";
            var current = getSelected();
            if (current) {
                var prev = current.previousElementSibling;
                var dropdown = document.getElementById('FeedItemDropdown_' + current.id);
                if (code == A) {
                    var archive = dropdown.children[1].children[1];
                    archive.click();
                    if (!archive) {
                        console.log('Failed to archive post ' + questionID);
                    }
                }
                else {
                    var unread = dropdown.children[1].children[3];
                    unread.click();
                    if (!unread) {
                        console.log('Failed to mark post ' + questionID + 'as unread');
                    }
                }
                if (prev) { // go to the next most recent post.
                    prev.click();
                }
            }
            else {
                console.log("Did not select a question");
            }
        }
        else if ( (code == up || code == down) && alt) { // up + alt, down + alt
          event.preventDefault();
          current = getSelected();
          if (current) {
            if (code == up) {
                current.previousElementSibling.click();
            }
            else {
                current.nextElementSibling.click();
            }
          }
          else {
            console.log("No question selected");
          }
        }
        else {
            // pass
        }
    });
}
piazza_hotkeys();