I have this piece of code:
var size = iframe.contentWindow.document.getElementsByClassName('checked').getElementsByTagName('span')[0].innerHTML;
For some reason every time I run it I get this message:
Uncaught TypeError: Object [object NodeList] has no method 'getElementsByTagName'
Even though all my other functions with getElementsByTagName()
work fine. What could be the reason for this error?
Thanks
getElementsByClassName
returns a set of elements (ie NodeList
), not a single element:
iframe
.contentWindow
.document
.getElementsByClassName('checked')[0] // <--- [0] (or whatever index)
.getElementsByTagName('span')[0]
.innerHTML;
Besides you can replace it with querySelector
:
iframe
.contentWindow
.document
.querySelector(".checked span")
.innerHTML;
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