我有这个脚本,当text
到达屏幕顶部时,它会更改图像。我要相反。当text
从底部的某个高度(例如50像素)变为可见时,我希望更改图像。我该怎么办?
JS小提琴:https://jsfiddle.net/ramo427e/
HTML:
<div class="main">
<div class="container">
<div class="row">
<div class="col-md-12">
<h1>This is sparta and what comes whatever after. This is sparta and what comes whatever after. This is sparta and what comes whatever after. </h1><h1>This is sparta and what comes whatever after. This is sparta and what comes whatever after. This is sparta and what comes whatever after. </h1>
</div>
<div class="col-md-6">
<section id="one">
<div class="content">
<h1>first heading</h1>
<p>description</p>
</div>
</section>
<section id="two">
<div class="content">
<h1>second heading</h1>
<p>description</p>
</div>
</section>
<section id="three">
<div class="content">
<h1>third heading</h1>
<p>description</p>
</div>
</section>
<section id="four">
<div class="content">
<h1>fourth heading</h1>
<p>description</p>
</div>
</section>
</div>
<div class="col-md-6">
<div class="image"></div>
</div>
</div>
<div class="row">
<div class="col-12">
<h1>This is sparta and what comes whatever after. This is sparta and what comes whatever after. This is sparta and what comes whatever after. </h1>
</div>
</div>
</div>
</div>
CSS:
*{
margin:0;
padding:0;
}
h1{
font-size: 18px;
font-weight: strong;
}
p{
font-size: 12px;
}
.main{
width:100%;
height:auto;
position: relative;
}
.image {
background-image:url('https://i.postimg.cc/FRxNp6yG/hr-ax.png');
background-size:100% 100%;
background-attachment:fixed;
transition: 1000ms;
width: 200px;
height: 200px;
position: fixed;
}
#one, #two, #three, #four {
min-height: 150px;
}
JS:
$(window).on("scroll touchmove", function() {
if ($(document).scrollTop() >= $("#one").position().top && $(document).scrollTop() < $("#two").position().top) {
$('.image').css('background-image', 'url(https://i.postimg.cc/FRxNp6yG/hr-ax.png)')
};
if ($(document).scrollTop() >= $("#two").position().top && $(document).scrollTop() < $("#three").position().top) {
$('.image').css('background-image', 'url(https://i.postimg.cc/wvz9hzm7/hr-bx.png)')
};
if ($(document).scrollTop() >= $("#three").position().top && $(document).scrollTop() < $("#four").position().top) {
$('.image').css('background-image', 'url(https://i.postimg.cc/FRxNp6yG/hr-ax.png)')
};
if ($(document).scrollTop() >= $("#four").position().top) {
$('.image').css('background-image', 'url(https://i.postimg.cc/wvz9hzm7/hr-bx.png)')
};
});
window.addEventListener('scroll', function() {
var element = document.querySelector('#main-container');
var position = element.getBoundingClientRect();
// checking whether fully visible
if(position.top >= 0 && position.bottom <= window.innerHeight) {
console.log('Element is fully visible in screen');
}
// checking for partial visibility
if(position.top < window.innerHeight && position.bottom >= 0) {
console.log('Element is partially visible in screen');
}
});
更多:
https://usefulangle.com/post/113/javascript-detecting-element-visible-during-scroll
if($(document).scrollTop() >= $("#one .content h1").position().top - 50){
$('.image').css('background-image', 'url(https://i.postimg.cc/FRxNp6yG/hr-ax.png)')
}