当用户滚动到页面底部时显示页脚

Question

这是我的页脚代码。

<div class="row">
    <div class="col-md-12">
        <div> the part that always showing at the bottom  </div>
    </div>
    <div class="col-md-12">
        <div> show only if the user reaching the bottom of the page </div>
    </div>
</div>

我的问题是我希望页脚贴在页面底部，直到用户到达底部，然后显示其他内容。

Answer 1

仅在 CSS 的帮助下，您可以将其重新考虑为两个页脚，一个弹出，另一个无聊；）

[id^=foo]{
  background:orange;
  padding:5px;
  font-size:25px;
}

#foo-boring{
  position:fixed;
  bottom:0;
  right:0;
  left:0;
}
#foo-pop{
  position:absolute;
  height:70px;
  right:0; left:0;
}

<div>SCROLL ME DOWN<br>much contents there.<br>much contents there.<br>much contents there.<br>much contents there.<br>much contents there.<br>much contents there.<br>much contents there.<br>much contents there.<br>much contents there.<br>much contents there.<br>much contents there.<br>much contents there.<br>much contents there.<br>much contents there.<br>much contents there.<br>much contents there.<br>much contents there.<br>much contents there.<br>much contents there.<br>much contents there.<br>much contents there.<br>much contents there.<br>much contents there.<br>much contents there.<br>much contents there.<br>much contents there.<br>much contents there.<br>much contents there.<br>much contents there.<br>much contents there.<br>much contents there.<br>much contents there.<br>much contents there.<br>much contents there.<br>much contents there.<br>much contents there.<br>much contents there.<br> END.</div>
<div id="foo-pop"><b>POP!1!!!1!!1!11!</b></div>
<div id="foo-boring">The boring footer.</div>

Answer 2

这里需要一点 Javascript。下面的代码应该可以工作。

$(document).ready(function() {
    $('#footer-final').hide()
});

$(window).scroll(function(){
    if ($(window).scrollTop() == $(document).height() - $(window).height()) {
        $('#footer-inter').hide()
        $('#footer-final').show()
    }
});

我假设您已经有了 CSS 来使页脚粘在页面底部 (position:fixed; bottom=0;) 在这种情况下，您可以替换任何代码来隐藏中间页脚并显示您想要的任何其他内容当用户滚动到底部时显示。

Answer 3

这是一个简单的脚本，用于跟踪滚动位置并将其与高度进行比较。滚动到底部时满足条件。到那时你可以随心所欲:)。

window.addEventListener('scroll', function () {
    console.log('scroll: ' + (window.innerHeight + window.scrollY));
    console.log('height: ' + document.body.offsetHeight);
    if ((window.innerHeight + window.scrollY) >= document.body.offsetHeight)      {
        console.log('here!');
    }
});

https://jsfiddle.net/jzrgmeqg/1