There is a common design feature where the sidebar on the left starts at a lower position on the page, but as you scroll it moves up to the top and remains fixed in place instead of disappearing off the screen. This is a popular design trend that I have encountered frequently.
When the user scrolls past a certain point on the page, the specified div will stay fixed to the top of the screen.
For example:
In this case, the top position is set manually as it remains constant in this specific scenario.
var $window = $(window), $menu = $("#menu");
$window.bind('scroll', function() {
var pos = +$window.scrollTop();
if (pos > 284) {
$menu.addClass("fixed");
}
else {
$menu.removeClass("fixed");
}
}).trigger("scroll");
The class "fixed" in CSS sets the position to fixed and top to 0.
For a simple solution, consider using the stickybits.js library instead of reinventing the wheel. It provides a seamless way to manage sticky elements without any extra frills.
The core concept is to monitor the scroll behavior within the specified container. When the element hits a particular scroll threshold, it becomes fixed in place.
To implement a scroll listener using jQuery for the document, the following code snippet can be used:
$(document).scroll(function() {
});
Within this function, you can compare the scrollHeight of the document with the y-position of a specific element, like so:
if($(document).scrollTop() < $('.sidebar').offset().top) {
// Adjust the css attributes to fix the element's position and set top to 0
$('.sidebar').css('position', 'fixed').css('top', 0);
} else {
// Reset the element's position to relative (default)
$('.sidebar').css('position', 'relative');
}
Although this approach is close to working, it always sets the y-position to 0 due to continuously checking the position of the fixed element. You can solve this by storing the default y-position. Here's the revised code with this enhancement:
var initial_y = $('.sidebar').offset().top;
$(document).scroll(function() {
$e = $('.sidebar');
if(initial_y - $(document).scrollTop() <= 0) {
$e.css('position', 'fixed').css('top', 0);
} else {
$e.css('position', 'relative');
}
});
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