el-dialog itself does not support dragging. It
will be centered on the interface and have a top margin of 15vh.
This article takes the Vue project as an example to realize the dragging function of the elementui pop-up window.
We create a directory called utils under src
and create a file below It is called directives.js and the reference code is as follows
import Vue from 'vue';
// v-dialogDrag: 弹窗拖拽属性
Vue.directive('dialogDrag', {
bind(el, binding, vnode, oldVnode) {
const dialogHeaderEl = el.querySelector('.el-dialog__header');
const dragDom = el.querySelector('.el-dialog');
//dialogHeaderEl.style.cursor = 'move';
dialogHeaderEl.style.cssText += ';cursor:move;'
dragDom.style.cssText += ';top:0px;'
// 获取原有属性 ie dom元素.currentStyle 火狐谷歌 window.getComputedStyle(dom元素, null);
const sty = (function() {
if (window.document.currentStyle) {
return (dom, attr) => dom.currentStyle[attr];
} else{
return (dom, attr) => getComputedStyle(dom, false)[attr];
}
})()
dialogHeaderEl.onmousedown = (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;
const screenWidth = document.body.clientWidth; // body当前宽度
const screenHeight = document.documentElement.clientHeight; // 可见区域高度(应为body高度，可某些环境下无法获取)
const dragDomWidth = dragDom.offsetWidth; // 对话框宽度
const dragDomheight = dragDom.offsetHeight; // 对话框高度
const minDragDomLeft = dragDom.offsetLeft;
const maxDragDomLeft = screenWidth - dragDom.offsetLeft - dragDomWidth;
const minDragDomTop = dragDom.offsetTop;
const maxDragDomTop = screenHeight - dragDom.offsetTop - dragDomheight;
// 获取到的值带px 正则匹配替换
let styL = sty(dragDom, 'left');
let styT = sty(dragDom, 'top');
// 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(styL.includes('%')) {
styL = +document.body.clientWidth * (+styL.replace(/\%/g, '') / 100);
styT = +document.body.clientHeight * (+styT.replace(/\%/g, '') / 100);
}else {
styL = +styL.replace(/\px/g, '');
styT = +styT.replace(/\px/g, '');
};
document.onmousemove = function (e) {
// 通过事件委托，计算移动的距离
let left = e.clientX - disX;
let top = e.clientY - disY;
// 边界处理
if (-(left) > minDragDomLeft) {
left = -(minDragDomLeft);
} else if (left > maxDragDomLeft) {
left = maxDragDomLeft;
}
if (-(top) > minDragDomTop) {
top = -(minDragDomTop);
} else if (top > maxDragDomTop) {
top = maxDragDomTop;
}
// 移动当前元素
dragDom.style.cssText += `;left:${
left + styL}px;top:${
top + styT}px;`;
};
document.onmouseup = function (e) {
document.onmousemove = null;
document.onmouseup = null;
};
}
}
})
Then import the file in main.js under src
import './utils/directives.js';
In this way, the global environment of our project will be fine.
Then add the v-dialogDrag instruction to the el-dialog tag.
The reference code is as follows
<el-dialog
title="测试数据管理"
class="dialog"
v-dialogDrag
:visible.sync="internalChange"
:before-close="handleClose"
id="userDialog"
:close-on-click-modal="false"
:destroy-on-close='true'
>
<div>测试弹窗拖拽功能</div>
</el-dialog>
After the steps are completed and v-dialogDrag is added, the pop-up window can be dragged freely
