elementui el-dialog弹窗最大化，拖动改变大小
main文件
import '@/utils/dialog.js'
dialog.js代码
import Vue from 'vue'
import variables from '@/styles/variables.scss'
/*
* 使用方法
* 将以下代码复制到一个js文件中，然后在入口文件main.js中import引入即可；
* 给elementUI的dialog上加上 v-dialogDrag 指令就可以实现弹窗的全屏和拉伸了。
* 给dialog设置 :close-on-click-modal="false" , 禁止点击遮罩层关闭弹出层
* 如果是form表单，不要将提交等按钮放置el-form-item，以免在上下拉伸时被隐藏
*/
// v-dialogDrag: 弹窗拖拽+水平方向伸缩
Vue.directive('dialogDrag', {
bind(el, binding, vnode, oldVnode) {
// 弹框可拉伸最小宽高
const minWidth = 400
const 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)
const 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
// const zuidahua = el.querySelector('#zuidahua')
const zuidahua = el.querySelector('.zuidahuaClass')
// 双击头部全屏效果
if (zuidahua != null) {
zuidahua.onclick = (e) => {
if (isFullScreen == false) {
nowHight = dragDom.clientHeight
nowWidth = dragDom.clientWidth
nowMarginTop = dragDom.style.marginTop
dragDom.style.left = 0
dragDom.style.top = 0
dragDom.style.bottom = 0
dragDom.style.height = window.innerHeight + 'px'
dragDom.style.width = '100VW'
dragDom.style.marginTop = '0px'
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
}
}
}
dragDom.onmousemove = function(e) {
const moveE = e
if (!(el.scrollTop + e.clientY > dragDom.offsetTop + dragDom.clientHeight - 10) && (e.clientX > dragDom.offsetLeft + dragDom.clientWidth - 10)) {
dragDom.style.cursor = 'w-resize'
} else if ((el.scrollTop + e.clientY > dragDom.offsetTop + dragDom.clientHeight - 10) && !(e.clientX > dragDom.offsetLeft + dragDom.clientWidth - 10)) {
dragDom.style.cursor = 's-resize'
} else if ((el.scrollTop + e.clientY > dragDom.offsetTop + dragDom.clientHeight - 10) && (e.clientX > dragDom.offsetLeft + dragDom.clientWidth - 10)) {
dragDom.style.cursor = 'se-resize'
} else {
dragDom.style.cursor = 'default'
dragDom.onmousedown = null
}
dragDom.onmousedown = (e) => {
const clientX = e.clientX
const clientY = e.clientY
const elW = dragDom.clientWidth
const elH = dragDom.clientHeight
const EloffsetLeft = dragDom.offsetLeft
const EloffsetTop = dragDom.offsetTop
dragDom.style.userSelect = 'none'
const ELscrollTop = el.scrollTop
// 判断点击的位置是不是为头部
if (clientX > EloffsetLeft && clientX < EloffsetLeft + elW && clientY > EloffsetTop && clientY < EloffsetTop + 100) {
// 如果是头部在此就不做任何动作，以上有绑定dialogHeaderEl.onmousedown = moveDown;
} else {
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 && 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'
// }
// }
// }
// 右侧鼠标拖拽位置
if (clientX > EloffsetLeft + elW - 10 && 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'
}
}
// 底部鼠标拖拽位置
if (ELscrollTop + clientY > EloffsetTop + elH - 20 && ELscrollTop + clientY < EloffsetTop + elH) {
// 往上拖拽
if (clientY > e.clientY) {
if (dragDom.clientHeight < minHeight) {
} else {
dragDom.style.height = elH - (clientY - e.clientY) + 'px'
}
}
// 往下拖拽
if (clientY < e.clientY) {
dragDom.style.height = elH + (e.clientY - clientY) + 'px'
}
}
}
// 拉伸结束
document.onmouseup = function(e) {
document.onmousemove = null
document.onmouseup = null
}
}
}
}
}
})