Js operation scroll bar event instance_javascript skills

This article mainly introduces how to operate the scroll bar event in js. The example analyzes the usage skills of the scroll bar and related precautions, for more information about how to operate a scroll bar event in js, see the example in this article. Share it with you for your reference. The specific analysis is as follows:

I have been wondering how to monitor the events of the scroll bar. Now I understand it.

The code below is to listen to the scroll bar as long as it moves, the lower returns the top p display and hidden code

window.onscroll = function () {   var t = document.documentElement.scrollTop || document.body.scrollTop;  if (t > 0) {     $(".cbbfixed").css("bottom", "10px");   } else {     $(".cbbfixed").css("bottom", "-85px");   } }

Note:

T: The distance from the scroll bar to the top end

T> 0, that is, once the scroll bar is rolled, the if () Statement is executed immediately. The code in else () is that when the scroll bar reaches the top, the p at the top is returned to hide

Return to the top button click operation:

$("#cgotop").click(function(){   $('body,html').animate({ scrollTop: 0 }, 100);   return false; });

Supplement:

1. Listen to the scroll bar event of an element

$(selector).scroll(function(){.......});

2. Get the scroll distance of the scroll bar

$(selector).scrollTop();$(selector).scrollLefft();

I hope this article will help you design javascript programs.