On modal visible action

[dimmuboy]

How can I do some action when user open modal with preferences?
I'm using fullPage.js so when I scroll in modal it scrolls my page on background instead modal. I would like to disable fullPage.js scrolling when modal is opened and enable it back when modal disappear.

[orestbida]

Hi @dimmuboy,

unfortunately, there is no built-in option to do such a thing. You can however use a MutationObserver — supported by all major browsers — to detect the open/closed state of the modal:

(function(){
    const html = document.documentElement;
    let isVisible = false, shouldShow = false;

    const observer = new MutationObserver(function() {
        shouldShow = html.className.indexOf('show--settings') > -1;

        if(!isVisible && shouldShow){
            isVisible = true;
            console.log("modal is visible")
        }else if(isVisible && !shouldShow){
            isVisible = false;
            console.log("modal is hidden")
        }
    });

    observer.observe(html, { 
        attributes: true, 
        attributeFilter: ['class']
    });
})();

[dimmuboy]

Great @orestbida, it works! I'm able to to disable and enable fullpage.js back now.
But I still have problem scroll content inside preferences window. When I try to scroll it do nothing :/

https://dnmetalchrom.sk/

[orestbida]

based on fullPage.js, there's an option called normalScrollElements which sholud allow normal scrolling on specific elements. Try using it like this:

normalScrollElements: "#s-bl"

[dimmuboy]

Awesome! It works, thanks