The change event of the element's styles at the best personal Finance up to a certain point of the browser window?

Hi all.
Tell me what methods, ways, libraries can without much effort (I'm lazy nothing very much to learn very much Google search kada is Tosti) to achieve hide, vyplyvali, the visual appearance of elements when best personal Finance bottom or top of the browser window to a certain pixel.
Better, of course, the libraries-frameworks - native they are more hardcore. Perfect - bower or npm modules - they can be compressed when compiling.
July 8th 19 at 16:00
2 answers
July 8th 19 at 16:02
Solution
July 8th 19 at 16:04
I'm lazy nothing very much to learn very much Google search kada is taster

So it is possible to remain forever Junior ohms. Although junior needs to know how this is done.

jQuery makes these things in 5 lines:
var scroll = 0;
$(window).on("scroll", function(){
 scroll = window.pageYOffset || (document.documentElement.clientHeight ? document.documentElement.scrollTop : document.body.scrollTop);
 if ($(".your_element").css("display") === "none" && scroll > 1200) { // 1200 - "a certain pixel"
$(".your_element").fadeIn();
}
});

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