el-dialog弹框拖拽
1、在 utils 中新建 directives.js 文件
import Vue from 'vue'
// 自定义元素实现弹框拖拽[重点]
Vue.directive('draw', {
inserted: function(el, binding, vNode) {
el.setAttribute('style', 'position: fixed; z-index: 9999')
},
bind: function(el, bindding, vNode) {
el.setAttribute('draggable', true)
let left, top, width, height
el._dragstart = function(event) {
event.stopPropagation()
left = event.clientX - el.offsetLeft
top = event.clientY - el.offsetTop
width = el.offsetWidth
height = el.offsetHeight
}
el._checkPosition = function() { // 防止被拖出边界
const width = el.offsetWidth
const height = el.offsetHeight
let left = Math.min(el.offsetLeft, document.body.clientWidth - width)
left = Math.max(0, left)
let top = Math.min(el.offsetTop, document.body.clientHeight - height)
top = Math.max(0, top)
el.style.left = left + 'px'
el.style.top = top + 'px'
el.style.width = width + 'px'
el.style.height = height + 'px'
}
el._dragEnd = function(event) {
event.stopPropagation()
left = event.clientX - left
top = event.clientY - top
el.style.left = left + 'px'
el.style.top = top + 'px'
el.style.width = width + 'px'
el.style.height = height + 'px'
el._checkPosition()
}
el._documentAllowDraop = function(event) {
event.preventDefault()
}
document.body.addEventListener('dragover', el._documentAllowDraop)
el.addEventListener('dragstart', el._dragstart)
el.addEventListener('dragend', el._dragEnd)
window.addEventListener('resize', el._checkPosition)
},
unbind: function(el, bindding, vNode) {
document.body.removeEventListener('dragover', el._documentAllowDraop)
el.removeEventListener('dragstart', el._dragstart)
el.removeEventListener('dragend', el._dragEnd)
window.removeEventListener('resize', el._checkPosition)
delete el._documentAllowDraop
delete el._dragstart
delete el._dragEnd
delete el._checkPosition
}
})
// v-dialogDrag: 弹窗拖拽
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'
// 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)
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
// 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
}
}
}
})
// v-dialogDragWidth: 弹窗宽度拖大 拖小
Vue.directive('dialogDragWidth', {
bind(el, binding, vnode, oldVnode) {
const dragDom = binding.value.$el.querySelector('.el-dialog')
el.onmousedown = (e) => {
// 鼠标按下，计算当前元素距离可视区的距离
const disX = e.clientX - el.offsetLeft
document.onmousemove = function(e) {
e.preventDefault() // 移动时禁用默认事件
// 通过事件委托，计算移动的距离
const l = e.clientX - disX
dragDom.style.width = `${l}px`
}
document.onmouseup = function(e) {
document.onmousemove = null
document.onmouseup = null
}
}
}
})
2、main.js中导入：import ‘./utils/directives.js’
3、使用 el-dialog 的地方加入 v-dialogDrag
:visible.sync="dialogVisible" v-dialogDrag> // ... 自定义元素弹框拖拽(重点) 自定义指令的内容，请见utils 中新建 directives.js 文件