Greasemonkey (using the waitForKeyElements utility) - how to call a function after a specific element has been displayed on screen

Question

(In continuance to this question of mine).
I\'ve been writing this userscript for the site metal-archives.com.
When opening a band page (example) you land to DISCOGR

Answer 1

Assuming the appendColumn function works, as is, on reloads; then you would rewrite it slightly and call it from waitForKeyElements().

You don't need most of that rigamorole, just use class names display and discog for the selector. Like so:

waitForKeyElements (".display.discog", appendColumn);

function appendColumn(jNode) {
    var tbl = jNode[0]; // table reference
    var i;
    var newCell, newText;    

    var tr = tbl.tHead.children[0],
    th = document.createElement('th');
    // THE REST OF THE FUNCTION IS THE SAME...
    //...