javascript - jquery Cannot read property 'getAttribute' of undefined - Stack Overflow

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The javascript I'm using works pletely fine in firefox and ie but has this error when run on chrome and safari. I'm not entirely sure why it's failing.

        var response = asyncResult.value;
        if (window.DOMParser) {
            var parser = new DOMParser();
            xmlDoc = parser.parseFromString(response, "text/xml");

        }
        else 
        {
            xmlDoc = new ActiveXObject("Microsoft.XMLDOM");
            xmlDoc.async = false;
            xmlDoc.loadXML(response);
        }

        console.log(xmlDoc);
         var changeKey = xmlDoc.getElementsById("t:ItemId")[0].getAttribute("ChangeKey");

The console shows this message but outputs the xmlDoc just fine when I have it set to console.log()

---

Uncaught TypeError: Cannot read property 'getAttribute' of undefined        r.js 
soapToGetItemDataCallback    r.js
r.onreadystatechange    outlookwebapp-15.js:21 
$h.EwsRequest.$1x_1    outlookwebapp-15.js:21 
(anonymous function)   outlookwebapp-15.js:21

The javascript I'm using works pletely fine in firefox and ie but has this error when run on chrome and safari. I'm not entirely sure why it's failing.

        var response = asyncResult.value;
        if (window.DOMParser) {
            var parser = new DOMParser();
            xmlDoc = parser.parseFromString(response, "text/xml");

        }
        else 
        {
            xmlDoc = new ActiveXObject("Microsoft.XMLDOM");
            xmlDoc.async = false;
            xmlDoc.loadXML(response);
        }

        console.log(xmlDoc);
         var changeKey = xmlDoc.getElementsById("t:ItemId")[0].getAttribute("ChangeKey");

The console shows this message but outputs the xmlDoc just fine when I have it set to console.log()

---

Uncaught TypeError: Cannot read property 'getAttribute' of undefined        r.js 
soapToGetItemDataCallback    r.js
r.onreadystatechange    outlookwebapp-15.js:21 
$h.EwsRequest.$1x_1    outlookwebapp-15.js:21 
(anonymous function)   outlookwebapp-15.js:21

• javascript
• jquery
• soap
• exchangewebservices

Share Improve this question Follow asked Mar 16, 2015 at 21:17 zoomynnzoomynn 311 gold badge11 silver badge33 bronze badges 6

• Does your console.log(xmlDoc); output the expected result? – blex Commented Mar 16, 2015 at 21:21
• yes, in both firefox and chrome – zoomynn Commented Mar 16, 2015 at 21:22
• getElementsById is an invalid method, so this should fail in all browsers. Perhaps it fails differently in Chrome and Safari than in IE and Firefox. – Rick Hitchcock Commented Mar 16, 2015 at 21:30
• You're right, I actually copied and pasted the wrong version. At one point, someone suggested I try "byId". I actually originally had getElementsByTagName, which was the source of the original error. Any thoughts ? – zoomynn Commented Mar 16, 2015 at 23:45
• Does using getElementsByTagName resolve your error? – jasonscript Commented Mar 17, 2015 at 2:10

 |  Show 1 more ment

1 Answer 1

Sorted by: Reset to default 1

The problem is that you are trying to get the element by ID and using [0], I guess you wanna getElementsByTagName because that the result is undefined, the code should be:

var changeKey = xmlDoc.getElementsById("t:ItemId").getAttribute("ChangeKey");

Or if "t:ItemId" is a collection:

 var changeKey = xmlDoc.getElementsByTagName("t:ItemId")[0].getAttribute("ChangeKey");

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