On my website, I want to display a logo in the header only when the site has been scrolled. I attempted to accomplish this with JavaScript:
if(document.getElementById("div").scrollTop != 0){
document.write("<img src='logo.jpg'>");
}
However, my code was unsuccessful. Does anyone know how to achieve this?
To implement a scroll event listener in JavaScript, use the code
window.addEventListener('scroll', callback)"block" to the img element's property.
window.addEventListener('scroll', function(e) {
if (document.getElementsByTagName("html")[0].scrollTop > 5) {
document.getElementsByClassName('imgHeader')[0].style.display = "block";
} else {
document.getElementsByClassName('imgHeader')[0].style.display = "none";
}
});.imgHeader {
height: 100px;
width: 100px;
display: none;
}
div {
height: 1000px;
}
header {
position: fixed;
top: 0;
width: 100%;
}<header><img class="imgHeader" src="https://material.angular.io/assets/img/examples/shiba1.jpg" /></header>
<div></div>Give this a try
$(document).on("scroll", function() {
if ($(document).scrollTop() > 5) {
$(".below-top-header").addClass("show-class");
} else {
$(".below-top-header").removeClass("show-class");
}
});.content {
height: 500px;
}
.show-class {
position: fixed;
display: block !important;
}
.hide-class {
display: none;
}<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="content">
<div class="below-top-header hide-class">
Image
</div>
</div>It seems like incorporating some JavaScript is necessary to achieve the desired functionality.
Below is a simple code snippet demonstrating the approach I employed:
html code, but with its CSS set to display: none,window.addEventListener('scroll', callback)none to block when the user scrolls down the page (i.e., when document.documentElement.scrollTop > 0var logo = document.getElementById('logo');
window.addEventListener('scroll', function(e) {
if (document.documentElement.scrollTop > 0) {
logo.style.display = 'block';
}else logo.style.display = 'none';
});#logo {
display: none;
position: fixed;
top: 0;
background: #aaa;
}
#page {
background: #ddd;
height: 2000px;
}<div id='logo'><img src='http://placekitten.com/200/50'></div>
<div id='page'>Start of page<br>Try to scroll down</div>I hope this solution proves useful to you.
To ensure your code is executed when the user scrolls, you must add a scrollListener to the window object. This will prevent it from only running on page load.
For more information on EventListeners, visit: https://developer.mozilla.org/de/docs/Web/API/EventTarget/addEventListener
window.addEventListener('scroll', function(e) {
//perform actions when the window is scrolled
});
Keep in mind that the event will be triggered every time the user scrolls.
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