convert jquery code to javascript

HI,
I need to convert the following code in jquery into pure javascript :
$(".clock-input").keyup(function(e) {
        if (e.keyCode == 38 || e.keyCode == 40)
            return;
        $(".clock-drop-down").hide();
        var text = $(this).val().toLowerCase();
                $(".clock-drop-down").html(listHtml);
                $(".clock-drop-down").show();
            }

            $(".clock-autocompleteoption").on('mouseover', function() {
                $(".clock-autocompleteoption").removeClass("clock-selectedoption");
                $(this).addClass("clock-selectedoption");
            });

            $(".clock-autocompleteoption").on('click', function() {
                $('.clock-drop-down').hide();
                var jid = $(this).data('id');
                $('.clock-input').val($(this).text());
                $('.clock-filter').trigger('clock:click', jid);
            });
        }
    });

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Thanks
Rohit BajajAsked:
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RobConnect With a Mentor Owner (Aidellio)Commented:
Who told you that jquery would make your project large?  it's 84kb!! :) Given the amount of code you'd need to write to not only write it in vanilla javascript but also to be cross browser compatible you would probably be more than 84kb :)

https://www.experts-exchange.com/articles/12264/Javascript-Frameworks-what-are-they.html
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Julian HansenCommented:
This is possible - but can I ask why you want to do this?
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Rohit BajajAuthor Commented:
yes..i wrote thia code for a library which will be imported by other users..but then i realized that using jquery will make the library big...
so if i dont use jquery the size of my file will become small..which is a preference for a library

if you can help me resolve one or two expressions that would be fine..
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