我有一个包含许多可排序项目的可排序元素（我们称之为可排序容器）。我正在尝试创建一个按钮，该按钮将创建更多可排序的容器，可以将其他可排序容器中的项目拖放到其中（如看板表）。
为此，我正在使用.createElement()附加适当的标签（在本例中为<div>，<ul>和<h2>）
表现出预期的元素如下所示：
<!-- a test container that behaves as excpected
this is able to have elements dragged from the main sortable
container and dropped into this div -->
<div class="container" style="background-color:#fff;">
<h2>new category</h2>
<ul class="sortable connectedSortable"> //when inspected with dev tools, class="sortable connectedSortable ui-sortable"
</ul>
</div>
这是我的函数创建的元素，其行为与预期不符：
<div class="container" style="background-color:#fff;">
<h2>new category</h2>
<ul class="sortable connectedSortable ui-sortable">
</ul>
</div>
我的问题是它们看上去完全相同，但看起来却不一样！我的目标是使函数创建的<div>能够将<li>标记从其他<div>标记拖放到其中。
我的功能
<script>
// function from sortable
$(function() {
$( ".sortable" ).sortable({
connectWith: ".connectedSortable",
receive: function( event, ui ) {
$(this).css({"background-color":'#fff'});
}
}).disableSelection();
//trying to add a new container with this function
document.getElementById("btnAdd").onclick = function () {
var h2 = document.createElement('h2'); //create h2 tag
h2.textContent="new category" //text = "new category"
var ul = document.createElement('ul'); //create ul tag
ul.className = "sortable connectedSortable ui-sortable" //specify class name
var div = document.createElement('div'); //create new div
div.className="container" // specify div class
div.style.backgroundColor="#fff"; //specify div color
document.getElementById('mainDiv').appendChild(div); //append newly created div to a main div section
div.appendChild(h2) //append newly created h2 to new div
div.appendChild(ul) //append newly created ul to new div
};
});
</script>
我的按钮来触发功能
<!-- this is the button that triggers function -->
<body>
<input type="button" id="btnAdd" value="Add New Category">
</body>
我感兴趣的元素
<div id="mainDiv">
<!-- my main sortable container -->
<div class="container" style="background-color:#fff;">
<h2>All colors:<br /></h2>
<p>Add as many categories as you'd like and start sorting!</p>
<ul class="sortable connectedSortable">
<li class="card">testing</li>
<li class="card">testing</li>
<li class="card">testing</li>
<li class="card">testing</li>
<li class="card">testing</li>
</ul>
</div>
<!-- a test container that behaves as excpected
this is able to have elements dragged from the main sortable container and dropped into this div -->
<div class="container" style="background-color:#fff;">
<h2>new category</h2>
<ul class="sortable connectedSortable">
<li class="card">testing</li>
</ul>
</div>
</div>
</html>
我正在使用的样式
<style>
body {font-family:Arial;}
h2 {margin:5px;}
p{margin:5px;}
input[type=text] {margin:10px}
input[type=button] {margin:10px}
.container {width: 20%; border: 1px solid; float:left; clear:right;margin:10px; border-radius: 5px;}
.sortable { list-style-type: none; margin:0; padding:2px; min-height:30px; border-radius: 5px;}
.sortable li { margin: 3px 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; }
.card{background-color:#f2e2e2; border-radius:3px;}
</style>
答案 0 :(得分：1)
简而言之，问题在于，您仅使.sortable元素在页面加载上可排序。之后添加的所有HTML将无法排序，因为您没有重新应用.sortable()函数。
这是一个带有注释代码的交互式示例，应该可以帮助您了解正在发生的事情：
$(function() {
// sortable elements to be made sortable on page load
var sortableElements = $(".sortable");
// a clone of the "new category" drop zone
var containerTemplate = $(".category-container").clone();
// the main container where clones will be appended
var mainDiv = $("#mainDiv");
// on page load, pass all ".sortable" elements to the makeSortable() function
makeSortable(sortableElements);
// "Add New Category" button
$("#btnAdd").click(function() {
// get a new template - on its own, this isn't sortable yet as .sortable() hasn't been called on it
var newContainer = containerTemplate.clone();
// append to #mainDiv
mainDiv.append(newContainer);
// find the <ul> and pass it to the makeSortable() function
makeSortable(newContainer.find(".sortable"));
})
// generic function which takes an element and applies jQuery's "sortable" functionality
function makeSortable(element) {
element.sortable({
connectWith: ".connectedSortable",
receive: function(event, ui) {
$(this).css("background-color", "#fff");
}
}).disableSelection();
}
})body {
font-family: Arial;
}
h2 {
margin: 5px;
}
p {
margin: 5px;
}
input[type=text] {
margin: 10px
}
input[type=button] {
margin: 10px
}
.container {
width: 20%;
border: 1px solid;
float: left;
clear: right;
margin: 10px;
border-radius: 5px;
}
.sortable {
list-style-type: none;
margin: 0;
padding: 2px;
min-height: 30px;
border-radius: 5px;
}
.sortable li {
margin: 3px 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;
}
.card {
background-color: #f2e2e2;
border-radius: 3px;
}
/* CSS additions for example */
#btnAdd {
display: block;
}<input type="button" id="btnAdd" value="Add New Category" />
<div id="mainDiv">
<div class="container" style="background-color:#fff;">
<h2>All colors:</h2>
<p>Add as many categories as you'd like and start sorting!</p>
<ul class="sortable connectedSortable">
<li class="card">testing</li>
<li class="card">testing</li>
<li class="card">testing</li>
<li class="card">testing</li>
<li class="card">testing</li>
</ul>
</div>
<div class="container category-container" style="background-color:#fff;">
<h2>new category</h2>
<ul class="sortable connectedSortable"></ul>
</div>
</div>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jqueryui/1.12.1/jquery-ui.min.js"></script>
<link href="https://cdnjs.cloudflare.com/ajax/libs/jqueryui/1.12.1/jquery-ui.min.css" rel="stylesheet"/>