要在jQuery Tree中實(shí)現(xiàn)節(jié)點(diǎn)拖拽限制,您需要設(shè)置draggable
選項(xiàng)并定義相關(guān)的事件處理程序。以下是一個(gè)示例,展示了如何限制節(jié)點(diǎn)只能在父節(jié)點(diǎn)內(nèi)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(biāo)簽內(nèi)編寫JavaScript代碼,設(shè)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(gè)示例中,我們通過beforeDrag
事件處理程序限制了節(jié)點(diǎn)拖拽。如果節(jié)點(diǎn)的父節(jié)點(diǎn)不是根節(jié)點(diǎn)(#
),則不允許拖拽。您可以根據(jù)需要修改此邏輯以適應(yīng)您的應(yīng)用程序。