element ui dialog可拉伸放大缩小和拖动

鼠标放到对话框头部可以拖动对话框、双击头部可以放大对话框

鼠标放到对话框左右两侧可以拖动对话框宽度、放到下边可以拖动对话框高度、放到右下角高度宽度可以同时缩放

使用中可能会出现报错信息：Failed to resolve directive: dialogdraghttps://blog.csdn.net/weixin_43583693/article/details/126712964?spm=1001.2014.3001.5501

<template>
	<div>
		&lt;el-button type="text" @click="dialogTableVisible = true"&gt;打开嵌套表格的 Dialog</el-button&gt;
		
		<el-dialog v-dialogDrag title="收货地址" :close-on-click-modal="false" :visible.sync="dialogTableVisible">
			<el-table :data="gridData">
				<el-table-column property="date" label="日期" width="150"></el-table-column>
				<el-table-column property="name" label="姓名" width="200"></el-table-column>
				<el-table-column property="address" label="地址"></el-table-column>
			</el-table>
		</el-dialog>
		
		<!-- Form -->
		<el-button type="text" @click="dialogFormVisible = true">打开嵌套表单的 Dialog</el-button>
		
		<el-dialog v-dialogDrag title="收货地址" :visible.sync="dialogFormVisible">
			<el-form :model="form">
				<el-form-item label="活动名称" :label-width="formLabelWidth">
					<el-input v-model="form.name" autocomplete="off"></el-input>
				</el-form-item>
				<el-form-item label="活动区域" :label-width="formLabelWidth">
					<el-select v-model="form.region" placeholder="请选择活动区域">
						<el-option label="区域一" value="shanghai"></el-option>
						<el-option label="区域二" value="beijing"></el-option>
					</el-select>
				</el-form-item>
			</el-form>
			<div slot="footer" class="dialog-footer">
				<el-button @click="dialogFormVisible = false">取 消</el-button>
				<el-button type="primary" @click="dialogFormVisible = false">确 定</el-button>
			</div>
		</el-dialog>
	</div>
</template>


 
<script>
	 import Vue from 'vue'
	 // 需要在对话框中添加 v-dialogDrag
	 Vue.directive('dialogDrag', {
	     bind(el, binding, vnode, oldVnode) {
	         //弹框可拉伸最小宽高
	         let minWidth = 400;
	         let minHeight = 300;
	         //初始非全屏
	         let isFullScreen = false;
	         //当前宽高
	         let nowWidth = 0;
	         let nowHight = 0;
	         //当前顶部高度
	         let nowMarginTop = 0;
	         //获取弹框头部（这部分可双击全屏）
	         const dialogHeaderEl = el.querySelector('.el-dialog__header');
	         //弹窗
	         const dragDom = el.querySelector('.el-dialog');
	         //给弹窗加上overflow auto；不然缩小时框内的标签可能超出dialog；
	         dragDom.style.overflow = "auto";
	         //清除选择头部文字效果
	         dialogHeaderEl.onselectstart = new Function("return false");
	         //头部加上可拖动cursor
	         dialogHeaderEl.style.cursor = 'move';
	 
	         // 获取原有属性 ie dom元素.currentStyle 火狐谷歌 window.getComputedStyle(dom元素, null);
	         const sty = dragDom.currentStyle || window.getComputedStyle(dragDom, null);
	 
	         let moveDown = (e) => {
	             // 鼠标按下，计算当前元素距离可视区的距离
	             const disX = e.clientX - dialogHeaderEl.offsetLeft;
	             const disY = e.clientY - dialogHeaderEl.offsetTop;
	 
	             // 获取到的值带px 正则匹配替换
	             let styL, styT;
	 
	             // 注意在ie中 第一次获取到的值为组件自带50% 移动之后赋值为px
	             if (sty.left.includes('%')) {
	                 styL = +document.body.clientWidth * (+sty.left.replace(/%/g, '') / 100);
	                 styT = +document.body.clientHeight * (+sty.top.replace(/%/g, '') / 100);
	             } else {
	                 styL = +sty.left.replace(/px/g, '');
	                 styT = +sty.top.replace(/px/g, '');
	             };
	 
	             document.onmousemove = function (e) {
	                 // 通过事件委托，计算移动的距离
	                 const l = e.clientX - disX;
	                 const t = e.clientY - disY;
	 
	                 // 移动当前元素
	                 dragDom.style.left = `${l + styL}px`;
	                 dragDom.style.top = `${t + styT}px`;
	 
	                 //将此时的位置传出去
	                 //binding.value({x:e.pageX,y:e.pageY})
	             };
	 
	             document.onmouseup = function (e) {
	                 document.onmousemove = null;
	                 document.onmouseup = null;
	             };
	         }
	         dialogHeaderEl.onmousedown = moveDown;
	         //双击(头部)效果不想要可以注释
	         dialogHeaderEl.ondblclick = (e) => {
	             if (isFullScreen == false) {
	                 nowHight = dragDom.clientHeight;
	                 nowWidth = dragDom.clientWidth;
	                 nowMarginTop = dragDom.style.marginTop;
	                 dragDom.style.left = 0;
	                 dragDom.style.top = 0;
	                 dragDom.style.height = "100VH";
	                 dragDom.style.width = "100VW";
	                 dragDom.style.marginTop = 0;
	                 isFullScreen = true;
	                 dialogHeaderEl.style.cursor = 'initial';
	                 dialogHeaderEl.onmousedown = null;
	             } else {
	                 dragDom.style.height = "auto";
	                 dragDom.style.width = nowWidth + 'px';
	                 dragDom.style.marginTop = nowMarginTop;
	                 isFullScreen = false;
	                 dialogHeaderEl.style.cursor = 'move';
	                 dialogHeaderEl.onmousedown = moveDown;
	             }
	         }
	 
	         //拉伸(右下方)效果不想要可以注释
	         let resizeEl = document.createElement("div");
	         dragDom.appendChild(resizeEl);
	         //在弹窗右下角加上一个10-10px的控制块
	         resizeEl.style.cursor = 'se-resize';
	         resizeEl.style.position = 'absolute';
	         resizeEl.style.height = '10px';
	         resizeEl.style.width = '10px';
	         resizeEl.style.right = '0px';
	         resizeEl.style.bottom = '0px';
	         resizeEl.style.zIndex = '99';
	         //鼠标拉伸弹窗
	         resizeEl.onmousedown = (e) => {
	             // 记录初始x位置
	             let clientX = e.clientX;
	             // 鼠标按下，计算当前元素距离可视区的距离
	             let disX = e.clientX - resizeEl.offsetLeft;
	             let disY = e.clientY - resizeEl.offsetTop;
	 
	             document.onmousemove = function (e) {
	                 e.preventDefault(); // 移动时禁用默认事件
	 
	                 // 通过事件委托，计算移动的距离
	                 let x = e.clientX - disX + (e.clientX - clientX);//这里 由于elementUI的dialog控制居中的，所以水平拉伸效果是双倍
	                 let y = e.clientY - disY;
	                 //比较是否小于最小宽高
	                 dragDom.style.width = x > minWidth ? `${x}px` : minWidth + 'px';
	                 dragDom.style.height = y > minHeight ? `${y}px` : minHeight + 'px';
	             };
	             //拉伸结束
	             document.onmouseup = function (e) {
	                 document.onmousemove = null;
	                 document.onmouseup = null;
	             };
	         }
	 
	         //拉伸(右边)效果不想要可以注释
	         let resizeElR = document.createElement("div");
	         dragDom.appendChild(resizeElR);
	         //在弹窗右下角加上一个10-10px的控制块
	         resizeElR.style.cursor = 'w-resize';
	         resizeElR.style.position = 'absolute';
	         resizeElR.style.height = '100%';
	         resizeElR.style.width = '10px';
	         resizeElR.style.right = '0px';
	         resizeElR.style.top = '0px';
	         //鼠标拉伸弹窗
	         resizeElR.onmousedown = (e) => {
	             let elW = dragDom.clientWidth;
	             let EloffsetLeft = dragDom.offsetLeft;
	             // 记录初始x位置
	             let clientX = e.clientX;
	             document.onmousemove = function (e) {
	                 e.preventDefault(); // 移动时禁用默认事件
	                 //右侧鼠标拖拽位置
	                 if (clientX > EloffsetLeft + elW - 10 &amp;&amp; clientX < EloffsetLeft + elW) {
	                     //往左拖拽
	                     if (clientX > e.clientX) {
	                         if (dragDom.clientWidth < minWidth) {
	                         } else {
	                             dragDom.style.width = elW - (clientX - e.clientX) * 2 + 'px';
	                         }
	                     }
	                     //往右拖拽
	                     if (clientX < e.clientX) {
	                         dragDom.style.width = elW + (e.clientX - clientX) * 2 + 'px';
	                     }
	                 }
	 
	             };
	             //拉伸结束
	             document.onmouseup = function (e) {
	                 document.onmousemove = null;
	                 document.onmouseup = null;
	             };
	         }
	 
	         //拉伸(左边)效果不想要可以注释
	         let resizeElL = document.createElement("div");
	         dragDom.appendChild(resizeElL);
	         //在弹窗右下角加上一个10-10px的控制块
	         resizeElL.style.cursor = 'w-resize';
	         resizeElL.style.position = 'absolute';
	         resizeElL.style.height = '100%';
	         resizeElL.style.width = '10px';
	         resizeElL.style.left = '0px';
	         resizeElL.style.top = '0px';
	         //鼠标拉伸弹窗
	         resizeElL.onmousedown = (e) => {
	             let elW = dragDom.clientWidth;
	             let EloffsetLeft = dragDom.offsetLeft;
	             // 记录初始x位置
	             let clientX = e.clientX;
	             document.onmousemove = function (e) {
	                 e.preventDefault(); // 移动时禁用默认事件
	                 //左侧鼠标拖拽位置
	                 if (clientX > EloffsetLeft &amp;&amp; clientX < EloffsetLeft + 10) {
	                     //往左拖拽
	                     if (clientX > e.clientX) {
	                         dragDom.style.width = elW + (clientX - e.clientX) * 2 + 'px';
	                     }
	                     //往右拖拽
	                     if (clientX < e.clientX) {
	                         if (dragDom.clientWidth < minWidth) {
	                         } else {
	                             dragDom.style.width = elW - (e.clientX - clientX) * 2 + 'px';
	 
	                         }
	                     }
	                 }
	 
	             };
	             //拉伸结束
	             document.onmouseup = function (e) {
	                 document.onmousemove = null;
	                 document.onmouseup = null;
	             };
	         }
	 
	         // 拉伸(下边)效果不想要可以注释
	         let resizeElB = document.createElement("div");
	         dragDom.appendChild(resizeElB);
	         //在弹窗右下角加上一个10-10px的控制块
	         resizeElB.style.cursor = 'n-resize';
	         resizeElB.style.position = 'absolute';
	         resizeElB.style.height = '10px';
	         resizeElB.style.width = '100%';
	         resizeElB.style.left = '0px';
	         resizeElB.style.bottom = '0px';
	         //鼠标拉伸弹窗
	         resizeElB.onmousedown = (e) => {
	             let EloffsetTop = dragDom.offsetTop;
	             let ELscrollTop = el.scrollTop;
	             let clientY = e.clientY;
	             let elH = dragDom.clientHeight;
	             document.onmousemove = function (e) {
	                 e.preventDefault(); // 移动时禁用默认事件
	                 //底部鼠标拖拽位置
	                 if (ELscrollTop + clientY > EloffsetTop + elH - 20 &amp;&amp; ELscrollTop + clientY < EloffsetTop + elH) {
	                     //往上拖拽
	                     if (clientY > e.clientY) {
	                         if (dragDom.clientHeight < minHeight) {
	                         } else {
	                             dragDom.style.height = elH - (clientY - e.clientY) * 2 + 'px';
	                         }
	                     }
	                     //往下拖拽
	                     if (clientY < e.clientY) {
	                         dragDom.style.height = elH + (e.clientY - clientY) * 2 + 'px';
	                     }
	                 }
	             };
	             //拉伸结束
	             document.onmouseup = function (e) {
	                 document.onmousemove = null;
	                 document.onmouseup = null;
	             };
	         }
	     }
	 })
	 
	export default {
		data() {
			return {
				gridData: [{
					date: '2016-05-02',
					name: '王小虎',
					address: '上海市普陀区金沙江路 1518 弄'
				}, {
					date: '2016-05-04',
					name: '王小虎',
					address: '上海市普陀区金沙江路 1518 弄'
				}, {
					date: '2016-05-01',
					name: '王小虎',
					address: '上海市普陀区金沙江路 1518 弄'
				}, {
					date: '2016-05-03',
					name: '王小虎',
					address: '上海市普陀区金沙江路 1518 弄'
				}],
				dialogTableVisible: false,
				dialogFormVisible: false,
				form: {
					name: '',
					region: '',
					date1: '',
					date2: '',
					delivery: false,
					type: [],
					resource: '',
					desc: ''
				},
				formLabelWidth: '120px'
			};
		}
	};
</script>

或者单独写一个js将Vue.directive(‘dialogDrag’, {

…………

} )中的代码放入其中如：

这样就可以，不用每个文件写一遍 

代码007普通

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