listeners-scratchpad.js

// -sp-context:browser
// Dumps the event listeners defined in the content window of the current tab.
var Ci = Components.interfaces;
var Cc = Components.classes;

let eventListenerService = Cc["@mozilla.org/eventlistenerservice;1"]
                             .getService(Ci.nsIEventListenerService);

Cu.import("resource://gre/modules/jsdebugger.jsm");
addDebuggerToGlobal(this);
let dbg = new Debugger();
let DOwindow = dbg.addDebuggee(content.window);

let nodes = content.window.document.querySelectorAll("*");
nodes = [content.window].concat(Array.prototype.slice.call(nodes));

for (let node of nodes) {
  let handlers = eventListenerService.getListenerInfoFor(node);

  for (let handler of handlers) {
    let listener = handler.listenerObject;
    let fName = handler.type;
    let dom0 = !!node["on" + fName];
    let nodeName = getNodeName(node);

    log("Node: " + nodeName);
    log("Type: " + fName);
    log("DOM0: " + dom0);
    log("Capturing: " + handler.capturing);
    log("Allows Untrusted: " + handler.allowsUntrusted);
    log("System Event: " + handler.inSystemEventGroup);

    if (listener) {
      let listenerDO = DOwindow.makeDebuggeeValue(listener);
      let script = listenerDO.script;
      let url, line;
      if (script) {
        url = script.url;
        line = script.startLine;
      }

      log("Origin: " + url + ":" + line);
    }

    log("---------------------------------------------------------");
  }
}

function getNodeName(node) {
  let nodeName = (node.nodeName + "").toLowerCase();

  if (node.id) {
    nodeName += "#" + node.id;
  }
  if (node.className) {
    nodeName += "." + node.className;
  }
  if (nodeName == "undefined") {
    nodeName = "window " + node.document.location.href;
  }
  return nodeName;
}

dbg.removeDebuggee(DOwindow);

function log(msg) {
  dump(msg + "\n");
}