How to implement the drag-and-drop function of the element-ui dialog box? (with code)

The content of this article is about how to implement the drag-and-drop function of the element-ui dialog box? (Attached is the code), which has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

element-ui dialog box can be dragged and dropped and boundary processing

In response to business needs, it is necessary to implement the problem of draggable dialog boxes. Element-ui does not provide official support, so it Refer to the master's article and come up with a solution that suits your business needs. Many codes given by masters do not solve the boundary problem, but if they do not solve the boundary problem, there is a bug. Drag it to the back of the invisible area and never drag it back. If you don’t believe me, you can try it.
In the case of implemented functions, they are encapsulated into js files and then introduced into main.js for global use.
Still code

The function implementation code directives.js 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;
            };
        }  
    }
})

In terms of boundary processing, because the height of the body cannot be obtained in my project (I am tortured by this (for a long time), so I took the method of getting the height of the visible area. Here I will add some knowledge.

document.body.clientWidth  //BODY对象宽度
document.body.clientHeight //BODY对象高度
document.documentElement.clientWidth  //可见区域宽度
document.documentElement.clientHeight //可见区域高度

Introduced in main.js

// 引入Dialog可拖拽，注意文件所在目录。目前尚未发现引入的先后关系，若有再补充
import './directives.js';

ue file and used:
Add in the el-dialog tag The specific use of v-dialogDrag attribute

<el-dialog v-dialogDrag></el-dialog>

is like this. I hope someone will see it, hahaha. Of course, the main thing is to help everyone.

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