Programming/Javascript

[JavaScript] html drag and drop - list draggable

prinha 2021. 5. 7. 12:18
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가장 간단한 방법은 아무래도 jQuery 라이브러리를 쓰는게...

하지만 내가 작성한 소스에서는 어떤 방법을 써도 먹통이었다ㅜㅜ..

간단한 기능 하나에 시간을 낭비하는 삽질은 언제 끝이날것인가.......

 

대부분 아래 소스로 구현이 가능하니 이 방법이 먹는다면 아무래도 이게 제일 나은 듯 싶다..

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>jQuery UI Sortable - Default functionality</title>
  <link rel="stylesheet" href="//code.jquery.com/ui/1.12.1/themes/base/jquery-ui.css">
  <link rel="stylesheet" href="/resources/demos/style.css">
  <style>
  #sortable { list-style-type: none; margin: 0; padding: 0; width: 60%; }
  #sortable li { margin: 0 3px 3px 3px; padding: 0.4em; padding-left: 1.5em; font-size: 1.4em; height: 18px; }
  #sortable li span { position: absolute; margin-left: -1.3em; }
  </style>
  <script src="https://code.jquery.com/jquery-1.12.4.js"></script>
  <script src="https://code.jquery.com/ui/1.12.1/jquery-ui.js"></script>
  <script>
  $( function() {
    $( "#sortable" ).sortable();
    $( "#sortable" ).disableSelection();
  } );
  </script>
</head>
<body>
 
<ul id="sortable">
  <li class="ui-state-default"><span class="ui-icon ui-icon-arrowthick-2-n-s"></span>Item 1</li>
  <li class="ui-state-default"><span class="ui-icon ui-icon-arrowthick-2-n-s"></span>Item 2</li>
  <li class="ui-state-default"><span class="ui-icon ui-icon-arrowthick-2-n-s"></span>Item 3</li>
  <li class="ui-state-default"><span class="ui-icon ui-icon-arrowthick-2-n-s"></span>Item 4</li>
  <li class="ui-state-default"><span class="ui-icon ui-icon-arrowthick-2-n-s"></span>Item 5</li>
  <li class="ui-state-default"><span class="ui-icon ui-icon-arrowthick-2-n-s"></span>Item 6</li>
  <li class="ui-state-default"><span class="ui-icon ui-icon-arrowthick-2-n-s"></span>Item 7</li>
</ul>
 
 
</body>
</html>

 

 

Sortable | jQuery UI

Sortable Reorder elements in a list or grid using the mouse. Enable a group of DOM elements to be sortable. Click on and drag an element to a new spot within the list, and the other items will adjust to fit. By default, sortable items share draggable prope

jqueryui.com

내 경우처럼 jQuery 라이브러리가 먹통일 때에는 이 방법을 쓰면 99%는 해결될 듯 하다.

아래의 방법은 javascript로 구현한 드래그 앤 드롭이다.

<!-- html -->
<ul>
	<li draggable="true" ondragend="dragEnd()" ondragover="dragOver(event)" ondragstart="dragStart(event)">1</li>
	<li draggable="true" ondragend="dragEnd()" ondragover="dragOver(event)" ondragstart="dragStart(event)">2</li>
	<li draggable="true" ondragend="dragEnd()" ondragover="dragOver(event)" ondragstart="dragStart(event)">3</li>
	<li draggable="true" ondragend="dragEnd()" ondragover="dragOver(event)" ondragstart="dragStart(event)">4</li>
</ul>
// script

let selected = null
	
function dragOver(e) {
	if (isBefore(selected, e.target)) {
		 e.target.parentNode.insertBefore(selected, e.target)
	} else {
		 e.target.parentNode.insertBefore(selected, e.target.nextSibling)
	}
}
	
function dragEnd() {
	selected = null
}
	
function dragStart(e) {
	e.dataTransfer.effectAllowed = 'move'
	e.dataTransfer.setData('text/plain', null)
	selected = e.target
}
	
function isBefore(el1, el2) {
	let cur
	if (el2.parentNode === el1.parentNode) {
	  for (cur = el1.previousSibling; cur; cur = cur.previousSibling) {
	    if (cur === el2) return true
	  }
	}
	return false;
}

 

 

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