IE11 – The object does not support the “forEach” property or method

FYI : We use wordpress 5.7 and contact form 5.4.
And test from IE 11.15 on windows 10.

Best,
Sebastien.

Ok. We see that you use the Symbol type in your JS. Not support by IE11, since middle december. Is it a choice to not support IE 11 ?

We don’t really like it too, but our customers websites have visitors using IE11. From 2% to 11% depending on website profile (for business, personnal, …).

Thanks for your time,
Regards
Seb

Where can we see the website in question?

Hi,

It seem’s that we meet several problems.

https://demo.emendo.fr/wpcf7/

1) Install a clean website with : wordpress 5.7, twenty twenty-one theme and wpcf7 5.4.
-> Contact form work on ie11 without error

2) We enable Google Recaptcha v3 integration on this website.
-> We got error on Symbol and contact form not work on ie11

3) We try to reproduce error on foreach for querySelectorAll.
This error is still present on our websites but not on this one.
We try to find the difference and the reason …

Seb.

Ok.

The theme twenty twenty-one include /assets/js/polyfills.js for ie11.
It’s why we not see error on : querySelectorAll.foreach

In this file.
They add the support of the foreach function in Nodelist on IE11.

So contact form 7 v5.4 will work on iE11 with twenty twenty-one theme.
But not with other themes that not integrate this descended compatibility.

The good question is : why this patch is not include in wp-polyfill.js ?

/**
 * Polyfill for NodeList.foreach() because we need to support IE11.
 *
 * @see https://developer.mozilla.org/en-US/docs/Web/API/NodeList/forEach
 */
if ( window.NodeList && ! NodeList.prototype.forEach ) {
	NodeList.prototype.forEach = function( callback, thisArg ) {
		var i;
		thisArg = thisArg || window;
		for ( i = 0; i < this.length; i++ ) {
			callback.call( thisArg, this[i], i, this );
		}
	};
}

Thank you for sharing your findings. I don’t know why those polyfills are only in TT1, either.

After an whole day of work, we found a solution … remove ie11 from our support stack ??
Too much incompatibility, now is the time.

Thanks for your time,
Best
Seb

• This reply was modified 3 years, 12 months ago by emendo_seb.