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Usage examples of html5 drag and drop (code)

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Apr 11, 2019 pm 01:26 PM

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This article brings you usage examples (code) of drag and drop in HTML5. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

5 minutes to figure out the drag and drop of html5, as well as the order of other monitoring events and execution.

Examples are as follows:

Usage examples of html5 drag and drop (code)

<!DOCTYPE html>
<html>

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>5分钟drag and drop简明示例</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>
    <script>
        var dragged;

        document.addEventListener("dragstart", function (event) {
            console.log(&#39;==========dragstart 开始被拖拽==========一次拖动只执行一次&#39;);
            // 保存拖动元素的引用(ref.)
            dragged = event.target;
            // 使其半透明
            event.target.style.opacity = .5;
        }, false);

        /* 拖动目标元素时触发drag事件 */
        document.addEventListener("drag", function (event) {
            // console.log(&#39;==========drag==========拖拽时会一直监听，直到放下元素&#39;);
        }, false);

        /* 放置目标元素时触发事件 */
        document.addEventListener("dragover", function (event) {
            // console.log(&#39;==========dragover==========拖拽时会一直监听，直到放下元素&#39;);
            // 阻止默认动作以启用drop
            event.preventDefault();
        }, false);

        document.addEventListener("dragenter", function (event) {
            console.log(&#39;==========dragenter 拖曳元素 进入目标元素==========对应着dragleave&#39;);
            // 当可拖动的元素进入可放置的目标时高亮目标节点
            if (event.target.className == "dropzone") {
                event.target.style.background = "purple";
            }

        }, false);

        document.addEventListener("dragleave", function (event) {
            console.log(&#39;==========dragleave 拖曳元素 离开目标元素==========对应着dragenter&#39;);
            // 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) {
            console.log(&#39;==========drop 放下元素==========一次拖动只执行一次，在dragenter前触发&#39;);
            // 阻止默认动作（如打开一些元素的链接）
            event.preventDefault();
            // 将拖动的元素到所选择的放置目标节点中
            if (event.target.className == "dropzone") {
                event.target.style.background = "";
                dragged.parentNode.removeChild(dragged);
                event.target.appendChild(dragged);
            }

        }, false);

        document.addEventListener("dragend", function (event) {
            console.log(&#39;==========dragend 结束拖拽==========一次拖动只执行一次&#39;);
            // 重置透明度
            event.target.style.opacity = "";
        }, false);

    </script>
</head>

<body>
    <div>
        <div id="draggable" draggable="true" ondragstart="event.dataTransfer.setData(&#39;text/plain&#39;,null)">
            这是可以拖拽的DIV
        </div>
    </div>
    <div></div>
    <div></div>
    <div></div>
</body>

</html>

[Related recommendations: HTML5 video tutorial]

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