Disable scrolling on body in overlay modal view

Question

I am using this script to display and hide a modal view, but I want to disable scrolling on body once the modal view is opened and disable it when it is closed.

I tried to modify the JS code but it works but it breaks the opening animation. here is the code modified:

(function() {
var triggerBttn = document.getElementById( 'trigger-overlay' ),
    overlay = document.querySelector( 'div.overlay' ),
    bodyTag = document.querySelector( 'body' ),
    closeBttn = overlay.querySelector( 'button.overlay-close' );
    transEndEventNames = {
        'WebkitTransition': 'webkitTransitionEnd',
        'MozTransition': 'transitionend',
        'OTransition': 'oTransitionEnd',
        'msTransition': 'MSTransitionEnd',
        'transition': 'transitionend'
    },
    transEndEventName = transEndEventNames[ Modernizr.prefixed( 'transition' ) ],
    support = { transitions : Modernizr.csstransitions };

function toggleOverlay() {

    if( classie.has( overlay, 'open' ) ) {
        classie.remove( overlay, 'open' );
        classie.add( overlay, 'close' );

        var onEndTransitionFn = function( ev ) {
            if( support.transitions ) {
                if( ev.propertyName !== 'visibility' ) return;
                this.removeEventListener( transEndEventName, onEndTransitionFn );
            }

            classie.remove( overlay, 'close' );
            classie.remove( bodyTag, 'noscroll' );
        };
        if( support.transitions ) {
            overlay.addEventListener( transEndEventName, onEndTransitionFn );
        }
        else {
            onEndTransitionFn();
        }
    }
    else if( !classie.has( overlay, 'close' ) ) {
        classie.add( overlay, 'open' );
        classie.add( bodyTag, 'noscroll' );
    }
}

triggerBttn.addEventListener( 'click', toggleOverlay );
closeBttn.addEventListener( 'click', toggleOverlay );})();

Original Demo : jsfiddle

Answer 1

First add jquery. Download from https://jquery.com and add it to your document with <script src="jquery.min.js"></script>.

Then, at the bottom of the document (your document with your animation) add the following snip:

<script>
    $(document).ready(function() {
        $('#trigger-overlay').click(function() {
            $('html').css('overflow', 'hidden');
            $('body').bind('touchmove', function(e) {
                e.preventDefault()
            });
        });
        $('.overlay-close').click(function() {
            $('html').css('overflow', 'scroll');
            $('body').unbind('touchmove');
        });
    });
</script>

I have tried this with code from https://github.com/codrops/FullscreenOverlayStyles and animation Huge inc. This will prevent scrolling of text when animation is open.

Updated my answer, first answer did allow scrolling on touch devices.