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HomeWeb Front-endH5 TutorialUsage examples of html5 drag and drop (code)

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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