[英]Fade out on scroll up
我正在嘗試使div向上滾動時淡出。 如果您在向下滾動時查看envato.com,則當滾動向上滾動時,有關信息會淡入,然后逐漸淡出。 現在,我正在使用下面的js來使淡入效果生效,但是我不確定如何使div淡出。
$(function() {
$(window).scroll( function(){
$('.fadeInBlock').each( function(i){
var bottom_of_object = $(this).position().top + $(this).outerHeight();
var bottom_of_window = $(window).scrollTop() + $(window).height();
/* Adjust the "200" to either have a delay or that the content starts fading a bit before you reach it */
bottom_of_window = bottom_of_window + 350;
if ( bottom_of_window > bottom_of_object ) {
$(this).animate({'opacity':'1'},500);
}
});
});
});
我只是將else語句添加到您的代碼中,從而將不透明度更改回0,這樣,每次if語句為false時,也就是在div出現后用戶向上滾動,它將再次消失,然后重新出現。 像這樣:
$(function() {
$(window).scroll( function(){
$('.fadeInBlock').each( function(i){
var bottom_of_object = $(this).position().top + $(this).outerHeight();
var bottom_of_window = $(window).scrollTop() + $(window).height();
/* Adjust the "200" to either have a delay or that the content starts fading a bit before you reach it */
bottom_of_window = bottom_of_window + 350;
if( bottom_of_window > bottom_of_object ){
$(this).animate({'opacity':'1'},500);
}
else{
$(this).animate({'opacity':'0'},500);
}
});
});
});
$(window).on("load",function() {
$(window).scroll(function() {
$(".fade").each(function() {
/* Check the location of each desired element */
var objectBottom = $(this).offset().top + $(this).outerHeight();
var windowBottom = $(window).scrollTop() + $(window).innerHeight();
/* If the element is completely within bounds of the window, fade it in */
if (objectBottom < windowBottom) { //object comes into view (scrolling down)
if ($(this).css("opacity")==0) {$(this).fadeTo(500,1);}
} else { //object goes out of view (scrolling up)
if ($(this).css("opacity")==1) {$(this).fadeTo(500,0);}
}
});
}); $(window).scroll(); //invoke scroll-handler on page-load
});
.fade {
margin: 50px;
padding: 50px;
background-color: lightgreen;
opacity: 1;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>
<div>
<div class="fade">Fade In 01</div>
<div class="fade">Fade In 02</div>
<div class="fade">Fade In 03</div>
<div class="fade">Fade In 04</div>
<div class="fade">Fade In 05</div>
<div class="fade">Fade In 06</div>
<div class="fade">Fade In 07</div>
<div class="fade">Fade In 08</div>
<div class="fade">Fade In 09</div>
<div class="fade">Fade In 10</div>
</div>
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