Wondering how they achieve that cool effect on where the top line appears with a new logo when you scroll down? Is it done using a jQuery trick? How can you determine when a person has scrolled down a certain amount of pixels and then show them new HTML content?
Instead of using traditional methods, they could be utilizing jQuery-Waypoints to execute events when the user crosses a specific HTML element.
For instance, the following code snippet showcases how it can be implemented:
$('.entry').waypoint(function() {
alert('You have scrolled to an entry.');
});
Utilizing the jquery sonar plugin[1], they have implemented unique jquery events[2].
The clever technique involves placing a top element with static positioning on a high z-index layer, with the portion designated for the dynamic logo initially transparent. Upon triggering the jquery event, they reveal the new logo above all other content.
[1]
[2]
It is possible that the code utilizes window.pageYOffset, along with
document.documentElement.scrollHeightwindow.onscroll event is also incorporated.
Implementing the window.scroll() function allows for the detection of scroll events, and subsequently utilizing window.scrollTop() enables the calculation of the logo's distance from the top of the webpage. Reference: http://jsfiddle.net/XkMrc/2/
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