前端知识案例学习6-可拖拽元素2

 <!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" />
    <style>
      * {
        box-sizing: border-box;
        padding: 0;
        margin: 0;
      }
 
      main {
        width: 100vw;
        height: 100vh;
        display: grid;
        grid-template-columns: 1fr 1fr;
        place-items: center;
        background-color: hsl(0deg, 0%, 10%);
      }
 
      .draggable-container {
        width: 100%;
        height: 100%;
        display: grid;
        place-items: center;
      }
 
      .draggable,
      .droppable {
        border-radius: 4px;
      }
 
      .draggable {
        width: 25vw;
        height: 25vw;
        background: #00d9ff;
      }
 
      .droppable {
        width: 30vw;
        height: 30vw;
        border: 8px dashed #00d9ff;
        position: relative;
        display: grid;
        place-items: center;
      }
 
      .droppable::before {
        display: block;
        content: "请拖放到此区域";
        position: absolute;
        color: white;
        font-family: sans-serif;
        font-size: 3vw;
        color: hsl(0, 0%, 30%);
      }
 
      .droppable img {
        width: 80%;
        height: 80%;
        object-fit: contain;
      }
 
      .dragover {
        border: 8px dashed #ffae00;
      }
 
      .dropped {
        border: 8px dashed #48ff00;
      }
      .dropped::before {
        z-index: -1;
      }
    </style>
    <title>原生拖拽</title>
  </head>
  <body>
    <main>
      <div class="draggable-container">
        <div id="draggable" class="draggable" draggable="true"></div>
      </div>
      <div id="droppable" class="droppable"></div>
    </main>
    <script>
      const draggable = document.getElementById("draggable");
      const droppable = document.getElementById("droppable");
 
      draggable.addEventListener("dragstart", handleDragStart);
      droppable.addEventListener("dragover", handleDragover);
      droppable.addEventListener("dragleave", handleDragLeave);
      droppable.addEventListener("drop", handleDrop);
 
      function handleDragStart(e) {
        e.dataTransfer.setData("text/plain", e.target.id);
        // 有 copy、move、和 auto 三种，分别是把鼠标指针
        // 显示为复制样式（带+号）、移动样式，或自动设置样式
        // e.dataTransfer.dropEffect = "move";
      }
 
      function handleDragover(e) {
        e.preventDefault();
        droppable.classList.add("dragover");
        // e.dataTransfer.dropEffect = "move";
      }
 
      function handleDragLeave(e) {
        droppable.classList.remove("dragover");
      }
 
      function handleDrop(e) {
        e.preventDefault();
        // 如果是文件
        [...e.dataTransfer.items].forEach((item) => {
          if (item.kind === "file") {
            const file = item.getAsFile();
            createPreview(file);
          }
        });
 
        // 如果是元素
        const draggedId = e.dataTransfer.getData("text/plain");
        droppable.appendChild(document.getElementById(draggedId));
        droppable.classList.add("dropped");
      }
 
      function createPreview(imageFile) {
        if (!imageFile.type.startsWith("image/")) {
          return;
        }
 
        const image = document.createElement("img");
        image.src = URL.createObjectURL(imageFile);
        image.onload = function () {
          URL.revokeObjectURL(this.src);
        };
        droppable.appendChild(image);
      }
    </script>
  </body>
</html>

posted @ 2022-11-28 10:48 前端导师歌谣阅读(22) 评论(0) 编辑收藏举报

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	<!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" />
	<style>
	* {
	box-sizing: border-box;
	padding: 0;
	margin: 0;
	}

	main {
	width: 100vw;
	height: 100vh;
	display: grid;
	grid-template-columns: 1fr 1fr;
	place-items: center;
	background-color: hsl(0deg, 0%, 10%);
	}

	.draggable-container {
	width: 100%;
	height: 100%;
	display: grid;
	place-items: center;
	}

	.draggable,
	.droppable {
	border-radius: 4px;
	}

	.draggable {
	width: 25vw;
	height: 25vw;
	background: #00d9ff;
	}

	.droppable {
	width: 30vw;
	height: 30vw;
	border: 8px dashed #00d9ff;
	position: relative;
	display: grid;
	place-items: center;
	}

	.droppable::before {
	display: block;
	content: "请拖放到此区域";
	position: absolute;
	color: white;
	font-family: sans-serif;
	font-size: 3vw;
	color: hsl(0, 0%, 30%);
	}

	.droppable img {
	width: 80%;
	height: 80%;
	object-fit: contain;
	}

	.dragover {
	border: 8px dashed #ffae00;
	}

	.dropped {
	border: 8px dashed #48ff00;
	}
	.dropped::before {
	z-index: -1;
	}
	</style>
	<title>原生拖拽</title>
	</head>
	<body>
	<main>
	<div class="draggable-container">
	<div id="draggable" class="draggable" draggable="true"></div>
	</div>
	<div id="droppable" class="droppable"></div>
	</main>
	<script>
	const draggable = document.getElementById("draggable");
	const droppable = document.getElementById("droppable");

	draggable.addEventListener("dragstart", handleDragStart);
	droppable.addEventListener("dragover", handleDragover);
	droppable.addEventListener("dragleave", handleDragLeave);
	droppable.addEventListener("drop", handleDrop);

	function handleDragStart(e) {
	e.dataTransfer.setData("text/plain", e.target.id);
	// 有 copy、move、和 auto 三种，分别是把鼠标指针
	// 显示为复制样式（带+号）、移动样式，或自动设置样式
	// e.dataTransfer.dropEffect = "move";
	}

	function handleDragover(e) {
	e.preventDefault();
	droppable.classList.add("dragover");
	// e.dataTransfer.dropEffect = "move";
	}

	function handleDragLeave(e) {
	droppable.classList.remove("dragover");
	}

	function handleDrop(e) {
	e.preventDefault();
	// 如果是文件
	[...e.dataTransfer.items].forEach((item) => {
	if (item.kind === "file") {
	const file = item.getAsFile();
	createPreview(file);
	}
	});

	// 如果是元素
	const draggedId = e.dataTransfer.getData("text/plain");
	droppable.appendChild(document.getElementById(draggedId));
	droppable.classList.add("dropped");
	}

	function createPreview(imageFile) {
	if (!imageFile.type.startsWith("image/")) {
	return;
	}

	const image = document.createElement("img");
	image.src = URL.createObjectURL(imageFile);
	image.onload = function () {
	URL.revokeObjectURL(this.src);
	};
	droppable.appendChild(image);
	}
	</script>
	</body>
	</html>

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前端知识案例学习6-可拖拽元素2

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