https://www.firemultimedia.nl/wp-content/plugins/hostfact-bestelformulier-integratie/hf-orderform.js?ver=5.5.3

1window.addEventListener("message", receiveMessage, false); 
2function receiveMessage(event){ 
3    if(typeof event.data == 'string' && event.data.substring(0,12) == 'iframe_click'){ 
4        jQuery('.hf-orderform').height(1* event.data.substring(13));
5    }
6    else if(typeof event.data == 'string' && event.data == 'iframe_reload')
7	{
8		var scrollTo = Math.max(
9			jQuery('html').scrollTop(),
10			jQuery('body').scrollTop()
11		);
12
13		if(scrollTo > jQuery('.hf-orderform').offset().top)
14		{
15			jQuery('html, body').animate({scrollTop: jQuery('.hf-orderform').offset().top}, 100);
16		}
17	}
18}