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[英]Re-Positioning Scroll to Top Button when Footer appears (So it never overlaps)
[英]Repositioning Scroll to Top Button when Footer appears
一旦站點用戶向下滾動足夠遠以使頁腳出現在屏幕上,就必須有一種方法使我的“滾動到頂部”按鈕處理#footer容器的頂部,對嗎? 現在它只想固定在屏幕的左下角-這很有意義,但是必須有一種方法可以做我想做的事情,作為一個新手,我似乎無法弄清楚! 任何幫助將非常感激。 謝謝!
我網站上我們使用按鈕的頁面: http : //joriebreonn.com/blogs/jb-blog/35009473-its-a-knockout
這是我的腳本:
jQuery(document).ready(function($){
// browser window scroll (in pixels) after which the "back to top" link is shown
var offset = 300,
//browser window scroll (in pixels) after which the "back to top" link opacity is reduced
offset_opacity = 1200,
//duration of the top scrolling animation (in ms)
scroll_top_duration = 700,
//grab the "back to top" link
$back_to_top = $('.cd-top');
//hide or show the "back to top" link
$(window).scroll(function(){
( $(this).scrollTop() > offset ) ? $back_to_top.addClass('cd-is-visible') : $back_to_top.removeClass('cd-is-visible cd-fade-out');
if( $(this).scrollTop() > offset_opacity ) {
$back_to_top.addClass('cd-fade-out');
}
});
//smooth scroll to top
$back_to_top.on('click', function(event){
event.preventDefault();
$('body,html').animate({
scrollTop: 0 ,
}, scroll_top_duration
);
});
});
和相關的CSS:
.cd-top {
display: inline-block;
height: 40px;
width: 40px;
position: fixed;
bottom: 40px;
right: 10px;
box-shadow: none;
/* image replacement properties */
overflow: hidden;
text-indent: 100%;
white-space: nowrap;
background: url('litebox-next.png') no-repeat center 50%;
background-size: 40px;
-webkit-transform: rotate(270deg);
-moz-transform: rotate(270deg);
-ms-transform: rotate(270deg);
-o-transform: rotate(270deg);
transform: rotate(270deg);
visibility: hidden;
opacity: 0;
-webkit-transition: opacity .3s 0s, visibility 0s .3s;
-moz-transition: opacity .3s 0s, visibility 0s .3s;
transition: opacity .3s 0s, visibility 0s .3s;
}
.cd-top.cd-is-visible, .cd-top.cd-fade-out, .no-touch .cd-top:hover {
-webkit-transition: opacity .3s 0s, visibility 0s 0s;
-moz-transition: opacity .3s 0s, visibility 0s 0s;
transition: opacity .3s 0s, visibility 0s 0s;
}
.cd-top.cd-is-visible {
/* the button becomes visible */
visibility: visible;
opacity: 1;
}
.cd-top.cd-fade-out {
/* if the user keeps scrolling down, the button is out of focus and becomes less visible */
opacity: .335;
}
.cd-top:hover {
background-color: transparent;
opacity: 1!important;
}
和html:
<a href="#0" class="cd-top">Top</a>
您的目標是使“滾動到頂部”按鈕位於頁腳頂部時是否可單擊? 因為您要做的就是將按鈕的z-index(CSS屬性)設置為100或更高,因此將其置於頁腳頂部。
如果您想將其移動到頁腳上方,我相信您可以在$(window).scroll()中放置第二個條件,以檢查scrollTop()是否在頁面末尾附近(通過將其與$(document)比較)。 height()),然后將按鈕的“底部”值設置為更高的值(例如,使用$ back_to_top.css(“ bottom”,“ 200”))。
好吧,我想通了! 這是我做的,以防萬一有人遇到類似的問題。 我在$(window).scroll(function()下添加了以下2條if語句:
if($(window).scrollTop() + $(window).height() < $(document).height() - $("#footer").height()) {
$('.cd-top').css("position","fixed"); //resetting it
$('.cd-top').css("bottom","40px"); //resetting it
}
if($(window).scrollTop() + $(window).height() > $(document).height() - $("#footer").height()) {
$('.cd-top').css("position","relative"); // make it related
$('.cd-top').css("bottom","0"); //
}
簽出-現在可以完全按照我的意願運行了! http://joriebreonn.com/blogs/jb-blog/35009473-its-a-knockout
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