Question

我试图与Sticky Header完全相反

粘滞标题：页面加载时无操作，滚动时达到Y偏移位置时粘贴top:0。

粘性页脚菜单：在页面加载时粘贴bottom:0，在滚动时到达Y偏移位置时取消粘贴。

我需要帮助的问题：

1 - 我需要它坚持屏幕底部.onload而不是.onscroll

window.onscroll = function() {myFunction()};
// replaced with this but no luck = window.onload = function(){myFunction()};

2 - 当你向下滚动它到达它在页面上的原始位置时，我需要它不粘。

// Get the offset position of the footermenu
var sticky = footermenu.offsetTop;

// Add the sticky class to the header, remove when its scroll position
// is reached - something here must be incorrect. 
function myFunction() {
    if (window.pageYOffset >= sticky) {
        footermenu.classList.remove("sticky");
    } else {
        footermenu.classList.add("sticky");
    }
}

Answer 1

首先，您应该保存初始页脚位置，然后将其粘贴：

var sticky = footermenu.offsetTop;
footermenu.classList.add("sticky");

然后检查页面是否到达该位置：

if (window.pageYOffset + window.innerHeight >= sticky + footermenu.clientHeight)

我在这里添加window.innerHeight，因为window.pageYOffset从页面顶部开始计算，您需要在底部位置。

请尝试以下代码：

＆＃13;

// When the user scrolls the page, execute myFunction 
window.onscroll = function() {myFunction()};

// replaced with this but no luck = window.onload = function(){myFunction()};

// Get the header
var footermenu = document.getElementById("myFootermenu");

// Get the offset position of the navbar
var sticky = footermenu.offsetTop;

footermenu.classList.add("sticky");

// Add the sticky class to the header when you reach its scroll position. Remove "sticky" when you leave the scroll position
function myFunction() {
  if (window.pageYOffset + window.innerHeight >= sticky + footermenu.clientHeight) {
    footermenu.classList.remove("sticky");
  } else {
    footermenu.classList.add("sticky");
  }
}

＆＃13;

/* Style the header */
.footermenu {
  padding: 10px 16px;
  background: #555;
  color: #f1f1f1;
}

/* Page content */
.content {
  padding: 16px;
}

/* The sticky class is added to the header with JS when it reaches its scroll position */
.sticky {
  position: fixed;
  bottom: 0;
  width: 100%
}

/* Add some top padding to the page content to prevent sudden quick movement (as the header gets a new position at the top of the page (position:fixed and top:0) */
.sticky + .content {
  padding-top: 102px;
}

/* Top container styling only */
.top-container {
  background-color: #f1f1f1;
  padding: 30px;
  text-align: center;
}

＆＃13;

<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">

</head>
<body>

<div class="top-container">
  <h1>Scroll Down</h1>
  <p>Scroll down to see the sticky effect.</p>
</div>

<div class="content">
  <h3>On Scroll Sticky Header</h3>
  <p>The header will stick to the top when you reach its scroll position.</p>
  <p>Scroll back up to remove the sticky effect.</p>
  <p>Some text to enable scrolling.. Lorem ipsum dolor sit amet, illum definitiones no quo, maluisset concludaturque et eum, altera fabulas ut quo. Atqui causae gloriatur ius te, id agam omnis evertitur eum. Affert laboramus repudiandae nec et. Inciderint efficiantur his ad. Eum no molestiae voluptatibus.</p>
  <p>Some text to enable scrolling.. Lorem ipsum dolor sit amet, illum definitiones no quo, maluisset concludaturque et eum, altera fabulas ut quo. Atqui causae gloriatur ius te, id agam omnis evertitur eum. Affert laboramus repudiandae nec et. Inciderint efficiantur his ad. Eum no molestiae voluptatibus.</p>
  <p>Some text to enable scrolling.. Lorem ipsum dolor sit amet, illum definitiones no quo, maluisset concludaturque et eum, altera fabulas ut quo. Atqui causae gloriatur ius te, id agam omnis evertitur eum. Affert laboramus repudiandae nec et. Inciderint efficiantur his ad. Eum no molestiae voluptatibus.</p>
  <p>Some text to enable scrolling.. Lorem ipsum dolor sit amet, illum definitiones no quo, maluisset concludaturque et eum, altera fabulas ut quo. Atqui causae gloriatur ius te, id agam omnis evertitur eum. Affert laboramus repudiandae nec et. Inciderint efficiantur his ad. Eum no molestiae voluptatibus.</p><p>Some text to enable scrolling.. Lorem ipsum dolor sit amet, illum definitiones no quo, maluisset concludaturque et eum, altera fabulas ut quo. Atqui causae gloriatur ius te, id agam omnis evertitur eum. Affert laboramus repudiandae nec et. Inciderint efficiantur his ad. Eum no molestiae voluptatibus.</p>  <p>Some text to enable scrolling.. Lorem ipsum dolor sit amet, illum definitiones no quo, maluisset concludaturque et eum, altera fabulas ut quo. Atqui causae gloriatur ius te, id agam omnis evertitur eum. Affert laboramus repudiandae nec et. Inciderint efficiantur his ad. Eum no molestiae voluptatibus.</p><p>Some text to enable scrolling.. Lorem ipsum dolor sit amet, illum definitiones no quo, maluisset concludaturque et eum, altera fabulas ut quo. Atqui causae gloriatur ius te, id agam omnis evertitur eum. Affert laboramus repudiandae nec et. Inciderint efficiantur his ad. Eum no molestiae voluptatibus.</p>  <p>Some text to enable scrolling.. Lorem ipsum dolor sit amet, illum definitiones no quo, maluisset concludaturque et eum, altera fabulas ut quo. Atqui causae gloriatur ius te, id agam omnis evertitur eum. Affert laboramus repudiandae nec et. Inciderint efficiantur his ad. Eum no molestiae voluptatibus.</p><p>Some text to enable scrolling.. Lorem ipsum dolor sit amet, illum definitiones no quo, maluisset concludaturque et eum, altera fabulas ut quo. Atqui causae gloriatur ius te, id agam omnis evertitur eum. Affert laboramus repudiandae nec et. Inciderint efficiantur his ad. Eum no molestiae voluptatibus.</p>  <p>Some text to enable scrolling.. Lorem ipsum dolor sit amet, illum definitiones no quo, maluisset concludaturque et eum, altera fabulas ut quo. Atqui causae gloriatur ius te, id agam omnis evertitur eum. Affert laboramus repudiandae nec et. Inciderint efficiantur his ad. Eum no molestiae voluptatibus.</p><p>Some text to enable scrolling.. Lorem ipsum dolor sit amet, illum definitiones no quo, maluisset concludaturque et eum, altera fabulas ut quo. Atqui causae gloriatur ius te, id agam omnis evertitur eum. Affert laboramus repudiandae nec et. Inciderint efficiantur his ad. Eum no molestiae voluptatibus.</p>
  <p>Some text to enable scrolling.. Lorem ipsum dolor sit amet, illum definitiones no quo, maluisset concludaturque et eum, altera fabulas ut quo. Atqui causae gloriatur ius te, id agam omnis evertitur eum. Affert laboramus repudiandae nec et. Inciderint efficiantur his ad. Eum no molestiae voluptatibus.</p>
  <p>Some text to enable scrolling.. Lorem ipsum dolor sit amet, illum definitiones no quo, maluisset concludaturque et eum, altera fabulas ut quo. Atqui causae gloriatur ius te, id agam omnis evertitur eum. Affert laboramus repudiandae nec et. Inciderint efficiantur his ad. Eum no molestiae voluptatibus.</p>
  <p>Some text to enable scrolling.. Lorem ipsum dolor sit amet, illum definitiones no quo, maluisset concludaturque et eum, altera fabulas ut quo. Atqui causae gloriatur ius te, id agam omnis evertitur eum. Affert laboramus repudiandae nec et. Inciderint efficiantur his ad. Eum no molestiae voluptatibus.</p>
  <p>Some text to enable scrolling.. Lorem ipsum dolor sit amet, illum definitiones no quo, maluisset concludaturque et eum, altera fabulas ut quo. Atqui causae gloriatur ius te, id agam omnis evertitur eum. Affert laboramus repudiandae nec et. Inciderint efficiantur his ad. Eum no molestiae voluptatibus.</p>
</div>


</body>
<div class="footermenu" id="myFootermenu">
  <h2>Footer Menu</h2>
</div>
<div class="top-container">
  <h1>Scroll Down</h1>
  <p>Scroll down to see the sticky effect.</p>
</div>

</html>

＆＃13;

Answer 2

你走了。你需要传递var inside函数（sticky）{//你的代码}

＆＃13;

// Get the header
var footermenu = document.getElementById("myFootermenu");
// Get the offset position of the navbar
var sticky = footermenu.offsetTop;
myFunction(sticky);
window.onscroll  = function() {myFunction2(sticky)};

// replaced with this but no luck = window.onload = function(){myFunction()};
// Add the sticky class to the header when you reach its scroll position. Remove "sticky" when you leave the scroll position

function myFunction(sticky) {
 if (window.pageYOffset >= sticky) {
    footermenu.classList.remove("sticky");
  } else {
    footermenu.classList.add("sticky");
  }
}
function myFunction2(sticky) {
  if (window.pageYOffset >= sticky) {
    footermenu.classList.remove("sticky");
  } else {
    footermenu.classList.add("sticky");
  }
}

＆＃13;

/* Style the header */
.footermenu {
  padding: 10px 16px;
  background: #555;
  color: #f1f1f1;
}

/* Page content */
.content {
  padding: 16px;
}

/* The sticky class is added to the header with JS when it reaches its scroll position */
.sticky {
  position: fixed;
  bottom: 0;
  width: 100%
}

/* Add some top padding to the page content to prevent sudden quick movement (as the header gets a new position at the top of the page (position:fixed and top:0) */
.sticky + .content {
  padding-top: 102px;
}

/* Top container styling only */
.top-container {
  background-color: #f1f1f1;
  padding: 30px;
  text-align: center;
}

＆＃13;

<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">

</head>
<body>

<div class="top-container">
  <h1>Scroll Down</h1>
  <p>Scroll down to see the sticky effect.</p>
</div>

<div class="content">
  <h3>On Scroll Sticky Header</h3>
  <p>The header will stick to the top when you reach its scroll position.</p>
  <p>Scroll back up to remove the sticky effect.</p>
  <p>Some text to enable scrolling.. Lorem ipsum dolor sit amet, illum definitiones no quo, maluisset concludaturque et eum, altera fabulas ut quo. Atqui causae gloriatur ius te, id agam omnis evertitur eum. Affert laboramus repudiandae nec et. Inciderint efficiantur his ad. Eum no molestiae voluptatibus.</p>
  <p>Some text to enable scrolling.. Lorem ipsum dolor sit amet, illum definitiones no quo, maluisset concludaturque et eum, altera fabulas ut quo. Atqui causae gloriatur ius te, id agam omnis evertitur eum. Affert laboramus repudiandae nec et. Inciderint efficiantur his ad. Eum no molestiae voluptatibus.</p>
  <p>Some text to enable scrolling.. Lorem ipsum dolor sit amet, illum definitiones no quo, maluisset concludaturque et eum, altera fabulas ut quo. Atqui causae gloriatur ius te, id agam omnis evertitur eum. Affert laboramus repudiandae nec et. Inciderint efficiantur his ad. Eum no molestiae voluptatibus.</p>
  <p>Some text to enable scrolling.. Lorem ipsum dolor sit amet, illum definitiones no quo, maluisset concludaturque et eum, altera fabulas ut quo. Atqui causae gloriatur ius te, id agam omnis evertitur eum. Affert laboramus repudiandae nec et. Inciderint efficiantur his ad. Eum no molestiae voluptatibus.</p><p>Some text to enable scrolling.. Lorem ipsum dolor sit amet, illum definitiones no quo, maluisset concludaturque et eum, altera fabulas ut quo. Atqui causae gloriatur ius te, id agam omnis evertitur eum. Affert laboramus repudiandae nec et. Inciderint efficiantur his ad. Eum no molestiae voluptatibus.</p>  <p>Some text to enable scrolling.. Lorem ipsum dolor sit amet, illum definitiones no quo, maluisset concludaturque et eum, altera fabulas ut quo. Atqui causae gloriatur ius te, id agam omnis evertitur eum. Affert laboramus repudiandae nec et. Inciderint efficiantur his ad. Eum no molestiae voluptatibus.</p><p>Some text to enable scrolling.. Lorem ipsum dolor sit amet, illum definitiones no quo, maluisset concludaturque et eum, altera fabulas ut quo. Atqui causae gloriatur ius te, id agam omnis evertitur eum. Affert laboramus repudiandae nec et. Inciderint efficiantur his ad. Eum no molestiae voluptatibus.</p>  <p>Some text to enable scrolling.. Lorem ipsum dolor sit amet, illum definitiones no quo, maluisset concludaturque et eum, altera fabulas ut quo. Atqui causae gloriatur ius te, id agam omnis evertitur eum. Affert laboramus repudiandae nec et. Inciderint efficiantur his ad. Eum no molestiae voluptatibus.</p><p>Some text to enable scrolling.. Lorem ipsum dolor sit amet, illum definitiones no quo, maluisset concludaturque et eum, altera fabulas ut quo. Atqui causae gloriatur ius te, id agam omnis evertitur eum. Affert laboramus repudiandae nec et. Inciderint efficiantur his ad. Eum no molestiae voluptatibus.</p>  <p>Some text to enable scrolling.. Lorem ipsum dolor sit amet, illum definitiones no quo, maluisset concludaturque et eum, altera fabulas ut quo. Atqui causae gloriatur ius te, id agam omnis evertitur eum. Affert laboramus repudiandae nec et. Inciderint efficiantur his ad. Eum no molestiae voluptatibus.</p><p>Some text to enable scrolling.. Lorem ipsum dolor sit amet, illum definitiones no quo, maluisset concludaturque et eum, altera fabulas ut quo. Atqui causae gloriatur ius te, id agam omnis evertitur eum. Affert laboramus repudiandae nec et. Inciderint efficiantur his ad. Eum no molestiae voluptatibus.</p>
  <p>Some text to enable scrolling.. Lorem ipsum dolor sit amet, illum definitiones no quo, maluisset concludaturque et eum, altera fabulas ut quo. Atqui causae gloriatur ius te, id agam omnis evertitur eum. Affert laboramus repudiandae nec et. Inciderint efficiantur his ad. Eum no molestiae voluptatibus.</p>
  <p>Some text to enable scrolling.. Lorem ipsum dolor sit amet, illum definitiones no quo, maluisset concludaturque et eum, altera fabulas ut quo. Atqui causae gloriatur ius te, id agam omnis evertitur eum. Affert laboramus repudiandae nec et. Inciderint efficiantur his ad. Eum no molestiae voluptatibus.</p>
  <p>Some text to enable scrolling.. Lorem ipsum dolor sit amet, illum definitiones no quo, maluisset concludaturque et eum, altera fabulas ut quo. Atqui causae gloriatur ius te, id agam omnis evertitur eum. Affert laboramus repudiandae nec et. Inciderint efficiantur his ad. Eum no molestiae voluptatibus.</p>
  <p>Some text to enable scrolling.. Lorem ipsum dolor sit amet, illum definitiones no quo, maluisset concludaturque et eum, altera fabulas ut quo. Atqui causae gloriatur ius te, id agam omnis evertitur eum. Affert laboramus repudiandae nec et. Inciderint efficiantur his ad. Eum no molestiae voluptatibus.</p>
</div>


</body>
<div class="footermenu" id="myFootermenu">
  <h2>Footer Menu</h2>
</div>
<div class="top-container">
  <h1>Scroll Down</h1>
  <p>Scroll down to see the sticky effect.</p>
</div>

</html>

＆＃13;

Answer 3

你可以用CSS位置粘贴来完成你想要的吗？

footer { position: sticky; bottom: 0; }

在加载时会有粘性，并且它不会像固定位置那样覆盖内容（这就是为什么我怀疑你希望它 un 坚持某一点）。

根据caniuse的说法

It has about 75% browser support，并且会在不支持它的浏览器上优雅地降级。

粘滞页脚菜单

3 个答案: