JSFiddle - React, Tailwind, and code Playground

by Andy You

HTML

<div class="columns">
  <div class="column" draggable="true" id="col-1">
    <header>A</header>
  </div>
  <div class="column" draggable="true" id="col-2">
    <header>B</header>
  </div>
  <div class="column" draggable="true" id="col-3">
    <header>C</header>
  </div>
</div>

SCSS

/**
 * 防止可以被拖移的元素內部的文字被選取造成局部拖移
 */
[draggable] {
  -moz-user-select: none;
  -khtml-user-select: none;
  -webkit-user-select: none;
  user-select: none;
  /**
   * 舊版 WebKit 需要此設定讓元素可以被拖移
   */
  -khtml-user-drag: element;
  -webkit-user-drag: element;
}

.column {
  height: 150px;
  width: 150px;
  float: left;
  border: 1px solid #ccc;
  background-color: pink;
  margin-right: 5px;
  text-align: center;
  cursor: move;
  
  header {
    text-shadow: #fff 0 1px;
    box-shadow: 5px;
  }
  
  &.over {
    border: 2px dashed gray;
  }
}

Babel + JSX

var columns = document.querySelectorAll('.columns .column')

;[...columns].forEach( (col) => { 
	col.addEventListener('dragstart', dragStart, false)
  col.addEventListener('dragover', dragOver, false)
  col.addEventListener('dragenter', dragEnter, false)
  col.addEventListener('dragleave', dragLeave, false)
})

function dragStart (e) {
  this.style.opacity = 0.4
}

function dragOver (e) {
  if (e.preventDefault) {
  	// 觸發 drop 需要這行
  	e.preventDefault()
  }
  e.dataTransfer.dropEffect = 'move'
  return false
}

function dragEnter (e) {
	console.log('enter')
  this.classList.add('over')
}

function dragLeave (e) {
  this.classList.remove('over')
}