Resize an iframe with Javascript

[georgie]

Hello

I have to integrate a Fabrik form in an external website, on which I do not have the hand (a company CMS ... ).
We must to use iframes...

My form Fabrik works very well, in connection with an extension emailing, controlled fields, responsive ... Great!
The company CMS will be unable to do that, only Fabrik. So I have to manage this.

Once integrated (we said "iframed", arf, I am going to become nuts!), my form still works on computer, but I have problem on mobile.

Here the page on extern website, my Fabrik form is in the center ("SUBSCRIBE TO OUR NEWSLETTER"):
https://www.euromedicom.com/en/contact/newsletter.html
Just resize like on mobile to see the problem at the footer of the form.

Somebody advices me a JS resize function, like this, to fix the problem on mobile:

function iframeResize(event) {
"use strict";
if (event.data !== "resetComplete") {
return;
}
var body = document.body,
html = document.documentElement,
height = Math.max(body.offsetHeight, html.offsetHeight);
if (parent.postMessage) {
parent.postMessage(height, "*");
}
}
function resetParentHeight() {
"use strict";
if (parent.postMessage) {
parent.postMessage("resetIframe", "*");
}
}
window.addEventListener("load", resetParentHeight, false);
window.addEventListener("message", iframeResize, false);

I know the Fabrik method (a file as form_XX.js in components\com_fabrik\js), but I do not understand how and where trigger the resize function.

Please could you help me?
Maybe there is a easier way...

THX

Georges

#Fabrik