javascript - Get originalTarget from tab load event MDN -

i'm trying originaltarget dom following example :

gbrowser.addeventlistener("load", function(aevent){ s.handleloadbrowser(aevent);},     true);  handleloadbrowser : function (aevent){     var w = aevent.originaltarget.defaultview; } 

i create event listener tab load:

var tab = gbrowser.addtab("www.google.com"); tab.addeventlistener("load", function(aevent){ s.handleloadtab(aevent) }, true);  handleloadtab : function (aevent){     var w = aevent.originaltarget.defaultview; }  

here error: "typeerror: win undefined".

how dom object tab event load ?

regarding first example, should work: did similar: https://gist.github.com/noitidart/9287185#file-bootstrap-js-l98 difference do: gbrowser.addeventlistener("load", s.handleloadbrowser, true);

regarding second example: var tab = gbrowser.addtab("www.google.com"); tab.addeventlistener("load", function(aevent){ s.handleloadtab(aevent) }, true); cant this, dont add load events tab, tab xul element grab , move around. can tab.linkedbrowser.contentwindow.addeventlistener('load' after first page load no longer there.

this code works me:

var tab = gbrowser.addtab("data:text/html,<b>hi</b>"); tab.linkedbrowser.contentwindow.addeventlistener("load", handleloadtab, true); //tab.linkedbrowser.contentwindow.addeventlistener("domcontentloaded", handleloadtab, true);  function handleloadtab(aevent){     var w = aevent.originaltarget.defaultview;   w.alert('load done') }  

also here's example of how listen first on load of 1 tab. use gbrowser.loadonetab in example, interchangeable addtab: https://gist.github.com/noitidart/0f076070bc77abd5e406

var tab = gbrowser.loadonetab('data:text/html,<span class="profilist-build-icon-1">backround of span of icon on desktop</span><input type="button" value="applycss"><input type="button" value="removecss"> change file on desktop to: <input type="button" value="release img"><input type="button" value="beta img"><input type="button" value="aurora img"><input type="button" value="nightly img">', {inbackground:false});     var mobs = new window.mutationobserver(function(mutations) {         mutations.foreach(function(mutation) {             var attrval = tab.getattribute(mutation.attributename);             console.log(mutation.attributename, attrval);             if (mutation.attributename == 'progress' && attrval == 'true') {               //at point can addeventlistener domconentloaded , document hasnt loaded yet               tab.linkedbrowser.contentdocument.addeventlistener('domcontentloaded', function() {                 tab.linkedbrowser.contentdocument.removeeventlistener('domcontentloaded', arguments.callee, false);                 alert('loadonetab finished loading', tab.linkedbrowser.contentdocument.body.innerhtml)               }, false);               mobs.disconnect();             }           /*             if (mutation.attributename == 'progress' && attrval == '') {              //cannot add addeventlistener domconentloaded here document loaded, never fire               alert('tab done loading');               mobs.disconnect();             }            */         });     });     mobs.observe(tab, {         attributes: true     });  console.log(tab._fullyopen)