我有一个无序列表：
使用此代码实现：
<ul>
<li>List item 1</li>
<li>List item 2</li>
<li>List item 3</li>
<li>List item 4</li>
<li>List item 5</li>
</ul>
现在，我希望它是可拖动的。例如，如果我向上拖动“List item 5”，我可以将它放在“List item 2”和“List item 3”之间，它会变成第三个。
我想在没有 jQuery 的情况下做到这一点，只需简单的 Javascript。另外，我想使用原生 HTML5 draggable="true"。任何帮助，将不胜感激。
属性“可拖动”仅启用元素进行拖动。您需要实现 DnD 侦听器并实现 drop 事件以进行所需的更改。
您将在此示例中找到您想要解决的相同问题：http: //www.html5rocks.com/en/tutorials/dnd/basics/
在示例中，他们为 A、B 和 C 列实现拖放。用户可以通过 DnD 更改顺序。
此代码将解决您的问题。使用MDN重做示例 试试这个jsfiddle.net
HTML 5
<ul>
<li class="dropzone" id='0' draggable="true">List item 1</li>
<li class="dropzone" id='1' draggable="true">List item 2</li>
<li class="dropzone" id='2' draggable="true">List item 3</li>
<li class="dropzone" id='3' draggable="true">List item 4</li>
<li class="dropzone" id='4' draggable="true">List item 5</li>
</ul>
纯JS
let dragged;
let id;
let index;
let indexDrop;
let list;
document.addEventListener("dragstart", ({target}) => {
dragged = target;
id = target.id;
list = target.parentNode.children;
for(let i = 0; i < list.length; i += 1) {
if(list[i] === dragged){
index = i;
}
}
});
document.addEventListener("dragover", (event) => {
event.preventDefault();
});
document.addEventListener("drop", ({target}) => {
if(target.className == "dropzone" && target.id !== id) {
dragged.remove( dragged );
for(let i = 0; i < list.length; i += 1) {
if(list[i] === target){
indexDrop = i;
}
}
console.log(index, indexDrop);
if(index > indexDrop) {
target.before( dragged );
} else {
target.after( dragged );
}
}
});
只需将 draggable="true" 添加到您的 li 元素中。
<ol ondragstart="">
<li draggable="true" data-value="data1">List Item 1</li>
<li draggable="true" data-value="data2">List Item 2</li>
<li draggable="true" data-value="data3">List Item 3</li>
</ol>
如果您使用 Firefox 进行测试，请注意它还需要在拖动操作中发送一些数据：
function handleDragStart(e) {
e.dataTransfer.effectAllowed = 'move';
e.dataTransfer.setData('text/html', e.target.innerHTML);
}
myLi.addEventListener('dragstart', handleDragStart, false);
否则，您将看不到被拖动内容的幻影图像......
<ul id="parent">
<li class="parent">List item 1</li>
<li class="parent">List item 2</li>
<li class="parent">List item 3</li>
<li class="parent">List item 4</li>
<li class="parent">List item 5</li>
</ul>
试试这个js
var dragSrcEl = null;
function handleDragStart(e) {
// Target (this) element is the source node.
this.style.opacity = '0.4';
dragSrcEl = this;
e.dataTransfer.effectAllowed = 'move';
e.dataTransfer.setData('text/html', this.innerHTML);
}
function handleDragOver(e) {
if (e.preventDefault) {
e.preventDefault(); // Necessary. Allows us to drop.
}
e.dataTransfer.dropEffect = 'move'; // See the section on the DataTransfer object.
return false;
}
function handleDragEnter(e) {
// this / e.target is the current hover target.
this.classList.add('over');
}
function handleDragLeave(e) {
this.classList.remove('over'); // this / e.target is previous target element.
}
function handleDrop(e) {
// this/e.target is current target element.
if (e.stopPropagation) {
e.stopPropagation(); // Stops some browsers from redirecting.
}
// Don't do anything if dropping the same column we're dragging.
if (dragSrcEl != this) {
// Set the source column's HTML to the HTML of the column we dropped on.
dragSrcEl.innerHTML = this.innerHTML;
this.innerHTML = e.dataTransfer.getData('text/html');
}
return false;
}
function handleDragEnd(e) {
// this/e.target is the source node.
[].forEach.call(cols, function (col) {
col.classList.remove('over');
});
}
var cols = document.querySelectorAll('#parent .parent');
[].forEach.call(cols, function (col) {
col.addEventListener('dragstart', handleDragStart, false);
col.addEventListener('dragenter', handleDragEnter, false)
col.addEventListener('dragover', handleDragOver, false);
col.addEventListener('dragleave', handleDragLeave, false);
col.addEventListener('drop', handleDrop, false);
col.addEventListener('dragend', handleDragEnd, false);
});