要在jQuery Tree中實現節點拖拽限制，您需要設置draggable選項并定義相關的事件處理程序。以下是一個示例，展示了如何限制節點只能在父節點內拖拽：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>jQuery Tree Drag and Drop Limit</title>
<link rel="stylesheet" href="//code.jquery.com/ui/1.12.1/themes/base/jquery-ui.css">
<script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
<script src="https://code.jquery.com/ui/1.12.1/jquery-ui.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery-tree/1.0.0/jquery.tree.min.js"></script>
</head>
<body>
<!-- Your tree container -->
<ul id="tree">
<li>Node 1
<ul>
<li>Node 1.1</li>
<li>Node 1.2</li>
</ul>
</li>
<li>Node 2</li>
<li>Node 3</li>
</ul>
<script>
// Your custom code will go here
</script>
</body>
</html>
<script>標簽內編寫JavaScript代碼，設置jQuery Tree插件，并定義拖拽限制：$(document).ready(function () {
$("#tree").tree({
draggable: true,
beforeDrag: function (node) {
// Check if the node is a child of another node
if (node.parent !== "#") {
return false; // Do not allow drag if the node is a child
}
},
onDragStart: function (event, node) {
// You can add additional logic here if needed
}
});
});
在這個示例中，我們通過beforeDrag事件處理程序限制了節點拖拽。如果節點的父節點不是根節點（#），則不允許拖拽。您可以根據需要修改此邏輯以適應您的應用程序。
