disable full page scrolling on iOS devices

Can you achieve elastic scrolling for a single absolutely positioned div in Mobile Safari without causing the entire page to move up and down?

Check out this basic example that illustrates the problem:

<!doctype html>
<html>
<head>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no">
    <meta name="apple-mobile-web-app-capable" content="yes" />
    <style>
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        #a, #b {
            position: absolute;
            top: 0;
            left: 0;
            height: 100%;
            padding: 10px;
            overflow: auto;
        }
        #a {
            width: 80px;
            background: #f00;
        }
        #b {
            background: #00f;
            left: 80px;
            width: 100%;
        }
    </style>
    <script src="http://code.jquery.com/jquery-1.10.1.min.js"></script>
    <script>
        function pdcb(e) {
            e.preventDefault();
        }
        function npcb(e) {
            e.stopPropagation();
        }
        $(document).on('touchstart touchmove', pdcb).
                    on('touchstart touchmove', '.scrollable', npcb);
    </script>
</head>
<body>
    <div id="a" class="scrollable">
        This<br>
        should<br>
        be<br>
        scrollable<br>
        but<br>
        not<br>
        scroll<br>
        the<br>
        whole<br>
        page<br>
        This<br>
        should<br>
        be<br>
        scrollable<br>
        but<br>
        not<br>
        scroll<br>
        the<br>
        whole<br>
        page<br>
        This<br>
        should<br>
        be<br>
        scrollable<br>
        but<br>
        not<br>
        scroll<br>
        the<br>
        whole<br>
        page<br>
        This<br>
        should<br>
        be<br>
        scrollable<br>
        but<br>
        not<br>
        scroll<br>
        the<br>
        whole<br>
        page<br>
        This<br>
        should<br>
        be<br>
        scrollable<br>
        but<br>
        not<br>
        scroll<br>
        the<br>
        whole<br>
        page<br>
    </div>
    <div id="b">
        this should never scroll
    </div>
</body>
</html>

Solution:

$(document).on('touchmove', function(e) {
    e.preventDefault();
}).ready(function() {
    $(".scrollable").on('touchstart', function(e) {
        this.allowUp = (this.scrollTop > 0);
        this.allowDown = (this.scrollTop < this.scrollHeight - this.clientHeight);
        this.prevTop = null;
        this.prevBot = null;
        this.lastY = e.originalEvent.pageY;
    }).on('touchmove', function(e) {
        var event = e.originalEvent;
        var up = (event.pageY > this.lastY), down = !up;
        this.lastY = event.pageY;

        if ((up && this.allowUp) || (down && this.allowDown))
            event.stopPropagation();
        else
            event.preventDefault();
    });
});
javascripthtmlioscssmobile-safari

Answer №1

The initial responses were impressive, however they had some shortcomings that I managed to rectify:

  • Elements positioned at the top or bottom did not scroll properly.
  • Dynamically added elements lacked scroll handlers.
  • There were unnecessary variables (prevTop, prevBot).

My solution tackles these issues. (Note the use of .scroll-y instead of .scrollable)

Firstly, introduce these CSS styles:

.scroll-y {
  overflow-y: auto;
  overflow-x: hidden;
  -webkit-overflow-scrolling: touch; /* preferred webkit native scroll */
}

Apply the .scroll-y class to any elements requiring scrolling functionality.

Then, implement this JavaScript code somewhere in your project:

// Disable default document scrolling behavior
$(document).on('touchmove', function(e) {
  e.preventDefault();
});

// Determine whether to allow vertical scrolling
$(document.body).on("touchstart", ".scroll-y", function (e) {
  // If element has overflowing content...
  if (this.scrollHeight !== this.clientHeight) {
    // Adjust scroll position slightly to enable up-scrolling from top
    if (this.scrollTop === 0) {
      this.scrollTop = 1;
    }
    // Adjust scroll position slightly to enable down-scrolling from bottom
    if (this.scrollTop === this.scrollHeight - this.clientHeight) {
      this.scrollTop = this.scrollHeight - this.clientHeight - 1;
    }
  }
  // Check scroll direction feasibility
  this.allowUp = this.scrollTop > 0;
  this.allowDown = this.scrollTop < (this.scrollHeight - this.clientHeight);
  this.lastY = e.originalEvent.pageY;
});

$(document.body).on('touchmove', ".scroll-y", function(e) {
  var event = e.originalEvent;
  var up = event.pageY > this.lastY;
  var down = !up;
  this.lastY = event.pageY;

  if ((up && this.allowUp) || (down && this.allowDown)) {
    event.stopPropagation();
  } else {
    event.preventDefault();
  }
});

Answer №2

Ensure that the touchmove event works properly within your div container without triggering scroll on the entire page. To achieve this, allow the native touchmove event to function within the element but prevent it from propagating up the DOM tree.

If you reach the edge of the content in your element, disable the native momentum scrolling completely.

The following code snippet, inspired by a tutorial found online (unfortunately, the original source is unknown), can be utilized for this purpose:

Assuming 'elem' represents your DOM node

elem.addEventListener('touchstart', function(event){
    this.allowUp = (this.scrollTop > 0);
    this.allowDown = (this.scrollTop < this.scrollHeight - this.clientHeight);
    this.prevTop = null; this.prevBot = null;
    this.lastY = event.pageY;
});

elem.addEventListener('touchmove', function(event){
    var up = (event.pageY > this.lastY), down = !up;
    this.lastY = event.pageY;

    if ((up && this.allowUp) || (down && this.allowDown)) event.stopPropagation();
    else event.preventDefault();
});

To apply the above code iteratively, create an array of elements and loop through them.

Good luck implementing this solution!

Answer №3

Aaron Grey's note proved to be very helpful!

For more information, visit: 

<!doctype html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <meta name="viewport" content="minimum-scale=1.0, width=device-width, maximum-scale=1.0, user-scalable=no, initial-scale=1">
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <style>

        .page{
            font-size: 24px;
            overflow: scroll;
        }

        .menu{
            position: fixed;
            top: 0;
            bottom: 0;
            left: 0;
            width: 80%;
            background: gray;
            z-index: 1;
            font-size: 10px;
            overflow: scroll;
            /* uncomment to get smooth momentum scroll, but also a rubber band effect */
            /*-webkit-overflow-scrolling: touch;*/
        }

        .menu-item{
            padding: 10px;
            background: darkgray;
            font-size: 24px;
        }

    </style>
</head>

<body>

<div class="menu scrollable">
    <div class="menu-item">hello world</div>
    <div class="menu-item">hello world</div>
    <div class="menu-item">hello world</div>
    <div class="menu-item">hello world</div>
    <div class="menu-item">hello world</div>
    <div class="menu-item">hello world</div>
    <div class="menu-item">hello world</div>
    <div class="menu-item">hello world</div>
    <div class="menu-item">hello world</div>
    <div class="menu-item">hello world</div>
    <div class="menu-item">hello world</div>
    <div class="menu-item">hello world</div>
    <div class="menu-item">hello world</div>
    <div class="menu-item">hello world</div>
    <div class="menu-item">hello world</div>
    <div class="menu-item">hello world</div>
    <div class="menu-item">hello world</div>
    <div class="menu-item">hello world</div>
</div>

<div class="page disable-scrolling">
    Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's
    standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make
    a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting,
    remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing
    Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions
    of Lorem Ipsum.
</div>

<script>


    document.ontouchmove = function ( event ) {

        var isTouchMoveAllowed = true, target = event.target;

        while ( target !== null ) {
            if ( target.classList && target.classList.contains( 'disable-scrolling' ) ) {
                isTouchMoveAllowed = false;
                break;
            }
            target = target.parentNode;
        }

        if ( !isTouchMoveAllowed ) {
            event.preventDefault();
        }

    };

    function removeIOSRubberEffect( element ) {

        element.addEventListener( "touchstart", function () {

            var top = element.scrollTop, totalScroll = element.scrollHeight, currentScroll = top + element.offsetHeight;

            if ( top === 0 ) {
                element.scrollTop = 1;
            } else if ( currentScroll === totalScroll ) {
                element.scrollTop = top - 1;
            }

        } );

    }

    removeIOSRubberEffect( document.querySelector( ".scrollable" ) );


</script>

</body>
</html>

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