I was thinking to minimize some javascript code but I get this "illegal invocation" error when I try to call a function through an alias

var d = document.createElement;
d('input');

Does anybody know why? tx

I was thinking to minimize some javascript code but I get this "illegal invocation" error when I try to call a function through an alias

var d = document.createElement;
d('input');

Does anybody know why? tx

• javascript
• typeerror

• 1 possible duplicate of document.createElement not working – Dave Commented Sep 6, 2015 at 12:34
• try var d = document.createElement.bind(document); – Jaromanda X Commented Sep 6, 2015 at 12:34

2 Answers 2

Looks like this has been addressed by others. It boils down to the fact that

document.createElement checks to make sure that this refers to document. You can bypass this behavior by doing the following:

Either A: always use it as document.createElement(tagname) OR

B

var o = document.createElement
o.call(document, tagname)

C

var d = document.createElement.bind(document); 

(from above answer)

See http://blog.vjeux./2011/javascript/hook-document-createelement.html

use

var d = document.createElement.bind(document);

to bind the this in your d function to the document object