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Reverse scroll element using jQuery

FOUND THE SOLUTION FOR THE BELOW PROBLEM: here Js Fiddle

Special thanks to jonhkr

I am working on reverse scrolling in jquery and I need help. My stuff / code: Js Fiddle

Achieved:

  • when the contents scroll down, the rocket moves up.

Problem:

  • When the rocket is dragged, the contents should scroll down.
  • Adding “containment” to drag and drop doesn't seem to work.
  • this should work with overflow as hidden.

For those who do not have Fiddle:

HTML:

<div id="test"> Lorem ipsum dolor sit amet, consectetur adipiscing elit. Maecenas eget nisi ipsum. Donec semper, justo at fringilla condimentum, felis tellus ultricies dolor, id convallis metus nulla quis est. Vivamus facilisis orci vel lectus blandit commodo blandit sem tempor. Curabitur condimentum, diam quis pretium feugiat, sem ante pretium tortor, in lobortis massa eros vitae dui. Nullam nisi mauris, condimentum a feugiat in, euismod quis augue. Maecenas euismod adipiscing tellus. Aliquam elementum egestas dolor, vel aliquam nulla tincidunt eget. Etiam risus elit, scelerisque eu volutpat sed, faucibus non ante. Donec sed nunc erat, eget facilisis risus. Etiam id odio tortor. Sed aliquam viverra volutpat. Sed gravida lectus eu mi ornare in feugiat magna elementum. Pellentesque in dolor ligula. Maecenas condimentum nisl eget arcu elementum nec imperdiet risus lobortis. Suspendisse id placerat turpis. Etiam dolor quam, placerat et volutpat nec, ultricies sed lorem. Fusce volutpat lobortis est ut pellentesque. Donec enim mauris, pretium quis gravida vitae, pellentesque ac nibh. Proin condimentum aliquam scelerisque. Vestibulum aliquet pharetra dapibus. Donec id nisi non nibh fringilla auctor et eget erat. Morbi pretium mauris sed orci pretium aliquam. Nulla pharetra venenatis nunc, in venenatis purus tempor vitae. Vivamus tincidunt dui non eros gravida sit amet consectetur nibh lacinia. Maecenas semper ligula et urna tincidunt placerat. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia Curae; Suspendisse arcu urna, facilisis at tempus id, posuere sed lacus. Vestibulum in feugiat tellus. Nullam suscipit, velit nec tincidunt pellentesque, enim odio ornare mauris, quis faucibus sem sapien sed turpis. Nulla sit amet risus in magna iaculis scelerisque sit amet vel erat. Morbi eu vestibulum nulla. Etiam auctor auctor felis, nec sodales velit condimentum non. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Duis eu massa diam, eu porttitor eros. Etiam blandit, turpis ac volutpat gravida, massa lorem congue orci, eget fringilla eros felis quis elit. Suspendisse quam tellus, pretium non mattis ut, laoreet in diam. Suspendisse ante odio, venenatis vel condimentum vitae, varius id sapien. Quisque ac nunc ipsum. Mauris porttitor blandit magna, id rutrum ipsum pellentesque non. In suscipit diam ligula, non tristique diam. Aliquam interdum ante at nisl sagittis vel luctus eros fringilla. Vestibulum purus orci, ultrices at tristique et, malesuada eget enim. Praesent commodo erat vel massa auctor id elementum elit elementum. Duis diam urna, mollis ut imperdiet aliquam, commodo id dui. Etiam vulputate facilisis dui id convall </div> <div id="track"> <div id="rocket"> </div> </div> <div id="xpos" style="clear:both"> </div>

CSS

 #track { height: 400px; width: 48px; overflow: hidden; margin: 10px 0 0 10px; background:#ccc; float:left; } #rocket{ height:48px; width:48px; background:#ccc url('http://www.veryicon.com/icon/preview/System/GANT%203/Rocket,%20This%20is%20a%20damn%20good%20Icon.jpg'); }​

JS (jQuery 1.8.2 and jQuery UI):

 $(document).ready(function() { $(function() { var left = parseInt($('#track').css('margin-left'), 10); var top = parseInt($('#track').css('margin-top'), 10); $("#rocket").draggable({ containment: "#track", axis: "y", scroll: false, drag: function(event, ui) { // Show the current dragged position of image var currentPos = $(this).position(); $("div#xpos").text("CURRENT: \nLeft: " + (currentPos.left - left) + "\nTop: " + (currentPos.top - top)); } }); }); });​
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2 answers

I modified your code a bit to solve these problems:

Adding “containment” to drag and drop does not work.

  var draggingRocket = false; $("#test").scroll(function(event) { if(!draggingRocket){ var st = $(this).scrollTop(); var pos = iHeight - (st / cr); $("#rocket").css("top", pos); } }); //rocket drag $("#rocket").draggable({ containment: $('#track'), axis: "y", scroll: false, start: function(event, ui) { draggingRocket = true; }, drag: function(event, ui) { // Show the current dragged position of image var currentPos = $(this).position(); $("div#xpos").text("CURRENT: \nLeft: " + (currentPos.left - left) + "\nTop: " + (currentPos.top - top)); $("#test").scrollTop(currentPos.top); }, stop: function(event, ui) { draggingRocket = false; } });
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First of all, good work.

Well, I don’t think your decision is far-fetched. Mostly you need to use

 $("#test").scrollTop((top - currentPos.top)*cr);

to set scrollTop from a div test. The equation I used is inaccurate, but you can change it accordingly.

Hope this gives you an edge:

Demo: http://jsfiddle.net/CZvWC/7/

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Source: https://habr.com/ru/post/1442155/

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