Unable to get property 'srcElement' of undefined or null reference OR window.event is undefined in FF

Question

I have implemented a Lync Contact Card Presence as follows:

var email = "userEmail@example.com";
var uuid = guid() + ",type=sip";
IMNRC(email, document.getElementById(uuid));
function guid() {  function s4() { return Math.floor((1 + Math.random()) * 0x10000).toString(16).substring(1); }
return s4() + s4() + '-' + s4() + '-' + s4() + '-' + s4() + '-' + s4() + s4() + s4(); }

In IE 10 and above it works sometimes, sometimes it throws "Unable to get property 'srcElement' of undefined or null reference".

In FireFox, it throws "window.event is undefined in FF"

I tried to use the following code but it didn't work:

document.addEventListener('onclick',ex.exampl,true);

var ex = { exampl: function(e){ var evt = e || window.event } }

`document.addEventListener('onclick',ex.exampl,true);` should be `document.addEventListener('click',ex.exampl,true);` — epascarello, Feb 16 '17 at 15:58
Unable to get property 'exampl' of undefined or null reference — fmourtaza, Feb 16 '17 at 16:03

score 0 · Accepted Answer · answered Feb 16 '17 at 16:08

0

It should be "click" not "onclick". You need to defined the object before you reference it because of hoisting. And you show an error about srcElement, but there is no srcElement in your code.

var ex = {
  exampl: function(e) {
    var evt = e || window.event,
        target = e.target || e.srcElement;
    console.log(target);
  }
}

document.addEventListener('click', ex.exampl, true);

<div>1</div>
<div>2</div>
<div>3</div>

In modern browsers, you really do not need the window check.

answered Feb 16 '17 at 16:08

epascarello

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I have followed your answer and in IE got it working however in FF still the same, dont know what is wrong. – fmourtaza Feb 17 '17 at 05:33
About srcElement, I wonder the same, I have not used it anywehere however it throws the error. – fmourtaza Feb 17 '17 at 05:33
@user .srcElement is the obsolete IE equivalent of .target property. see https://msdn.microsoft.com/en-us/library/ff974945(v=vs.85).aspx --- when FF doesn't like compound object.property as listener functiion, you can wrap it like this: function(evt){ ex.exampl(evt) } – user4749485 Feb 17 '17 at 06:24
Clear your cache on firefox. – epascarello Feb 17 '17 at 12:33
target = e.target || _evt_.srcElement – user4749485 Feb 18 '17 at 00:53

Unable to get property 'srcElement' of undefined or null reference OR window.event is undefined in FF

1 Answers1