拖拽事件demo

作者: 苍老师的眼泪 | 来源:发表于2022-03-11 00:37 被阅读0次

拖拽事件demo
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HTML 5 拖拽

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>

    <style>
        #draggable {
            width: 200px;
            height: 20px;
            text-align: center;
            background: white;
        }

        .dropzone {
            width: 200px;
            height: 20px;
            background: blueviolet;
            margin-bottom: 10px;
            padding: 10px;
        }
    </style>
</head>

<body>
    <div class="dropzone">
        <div id="draggable" draggable="true" ondragstart="event.dataTransfer.setData('text/plain',null)">
            This div is draggable
        </div>
    </div>
    <div class="dropzone"></div>
    <div class="dropzone"></div>
    <div class="dropzone"></div>

    <script>
        var dragged;

        /* 可拖动的目标元素会触发事件 */
        document.addEventListener("drag", function (event) {

        }, false);

        document.addEventListener("dragstart", function (event) {
            // 保存拖动元素的引用(ref.)
            dragged = event.target;
            // 使其半透明
            event.target.style.opacity = .5;
        }, false);

        document.addEventListener("dragend", function (event) {
            // 重置透明度
            event.target.style.opacity = "";
        }, false);

        /* 放下目标节点时触发事件 */
        document.addEventListener("dragover", function (event) {
            // 阻止默认动作
            event.preventDefault();
        }, false);

        document.addEventListener("dragenter", function (event) {
            // 当可拖动的元素进入可放置的目标高亮目标节点
            if (event.target.className == "dropzone") {
                event.target.style.background = "purple";
            }

        }, false);

        document.addEventListener("dragleave", function (event) {
            // 当拖动元素离开可放置目标节点，重置其背景
            if (event.target.className == "dropzone") {
                event.target.style.background = "";
            }

        }, false);

        document.addEventListener("drop", function (event) {
            // 阻止默认动作（如打开一些元素的链接）
            event.preventDefault();
            // 移动拖动的元素到所选择的放置目标节点
            if (event.target.className == "dropzone") {
                event.target.style.background = "";
                dragged.parentNode.removeChild(dragged);
                event.target.appendChild(dragged);
            }

        }, false);
    </script>
</body>

</html>

https://developer.mozilla.org/zh-CN/docs/Web/API/Document/dragover_event