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webApp禁止页面整体下拉,不影响页面内部scroll

此类事件是手机touchmove默认事件行为,可以通过js代码隐藏事件:

$(‘body’).on(‘touchmove’, function (event) {event.preventDefault();});
or
document.addEventListener('touchmove', function(e){e.preventDefault()}, false);

但这样往往会把页面原生的scroll效果也一同去掉了,下面的代码可以完美解决这个问题:

var overscroll = function(el) {
  el.addEventListener('touchstart', function() {
    var top = el.scrollTop
      , totalScroll = el.scrollHeight
      , currentScroll = top + el.offsetHeight;
    //If we're at the top or the bottom of the containers
    //scroll, push up or down one pixel.
    //
    //this prevents the scroll from "passing through" to
    //the body.
    if(top === 0) {
      el.scrollTop = 1;
    } else if(currentScroll === totalScroll) {
      el.scrollTop = top - 1;
    }
  });
  el.addEventListener('touchmove', function(evt) {
    //if the content is actually scrollable, i.e. the content is long enough
    //that scrolling can occur
    if(el.offsetHeight < el.scrollHeight)
      evt._isScroller = true;
  });
}
overscroll(document.querySelector('.scroll'));
document.body.addEventListener('touchmove', function(evt) {
  //In this case, the default behavior is scrolling the body, which
  //would result in an overflow.  Since we don't want that, we preventDefault.
  if(!evt._isScroller) {
    evt.preventDefault();
  }
});

下边是一个demo的展示,可以将其使用编译器打开并配置本地服务器使用手机打开查看效果:

<!DOCTYPE html>
<html>

    <head>
        <meta charset="UTF-8">
        <title></title>
        <meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no" />
        <style type="text/css">
            * {
                margin: 0;
                padding: 0;
            }

            html,
            body {
                width: 100%;
                height: 100%;
                overflow: hidden;
            }

            body {
                display: flex;
                flex-direction: column;
            }

            header {
                width: 100%;
                height: 44px;
                background: black;
            }

            footer {
                width: 100%;
                height: 50px;
                background: black;
            }

            section {
                flex: 1;
                overflow: auto;
            }
        </style>
    </head>

    <body>
        <header></header>
        <section class="scroll">
            <div style="width: 100%;min-height: 2000px;">内容滚动区域</div>
        </section>
        <footer></footer>

        <script>
            var overscroll = function(el) {
                el.addEventListener('touchstart', function() {
                    var top = el.scrollTop,
                        totalScroll = el.scrollHeight,
                        currentScroll = top + el.offsetHeight
                        //If we're at the top or the bottom of the containers
                        //scroll, push up or down one pixel.
                        //
                        //this prevents the scroll from "passing through" to
                        //the body.
                    if(top === 0) {
                        el.scrollTop = 1
                    } else if(currentScroll === totalScroll) {
                        el.scrollTop = top - 1
                    }
                })
                el.addEventListener('touchmove', function(evt) {
                    //if the content is actually scrollable, i.e. the content is long enough
                    //that scrolling can occur
                    if(el.offsetHeight < el.scrollHeight)
                        evt._isScroller = true
                })
            }
            overscroll(document.querySelector('.scroll'));//允许滚动的区域
            document.body.addEventListener('touchmove', function(evt) {
                //In this case, the default behavior is scrolling the body, which
                //would result in an overflow.  Since we don't want that, we preventDefault.
                if(!evt._isScroller) {
                    evt.preventDefault()
                }
            })
        </script>
    </body>

</html>


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