目录
说明
/**
* 自定义指令对象可以接收的钩子函数
* bind 只调用一次，指令第一次绑定到元素时调用
* inserted 被绑定元素插入父节点时调用
* update 所在组件的 VNode 更新时调用，但是可能发生在其子 VNode 更新之前
* componentUpdated 指令所在组件的 VNode 及其子 VNode 全部更新后调用
* unbind 只调用一次，指令与元素解绑时调用
*/
/**
* 自定义指令钩子函数参数 （binding参数包含内容）
* name：指令名，不包括 v- 前缀。
* value：指令的绑定值，例如：v-my-directive="1 + 1" 中，绑定值为 2。
* oldValue：指令绑定的前一个值，仅在 update 和 componentUpdated 钩子中可用。无论值是否改变都可用。
* expression：字符串形式的指令表达式。例如 v-my-directive="1 + 1" 中，表达式为 "1 + 1"。
* arg：传给指令的参数，可选。例如 v-my-directive:foo 中，参数为 "foo"。
* modifiers：一个包含修饰符的对象。例如：v-my-directive.foo.bar 中，修饰符对象为 { foo: true, bar: true }。
*/详细使用及参数说明请参见vue官方文档-自定义指令。
使用
import Vue from 'vue'
import copy from './copy.js'
import longpress from './longpress.js'
import { debounce, throttle } from './debounce.js'
import emoji from './emoji.js'
import permission from './permission'
import waterMarker from './waterMarker'
import draggable from './draggable'
import inputLimit from './inputLimit.js'
import dialogDrag from './dialogDrag.js'
import removeZero from './removeZero.js'
import overflowTip from './overflowTooltip.js'
const directives = {
copy,
longpress,
debounce,
throttle,
emoji,
waterMarker,
permission,
draggable,
inputLimit,
dialogDrag,
removeZero,
overflowTip
}
Object.keys(directives).forEach(key => Vue.directive(key, directives[key]))
自定义指令
节流
/**
* 使用
* <el-button v-throttle:500="handlerClick">节流按钮throttle</el-button>
*/
export const throttle = {
inserted (el, binding) {
if (typeof binding.value !== 'function') {
throw new Error('指令的参数必须是函数')
}
let flg = false
let timerName
let time = 500
if(binding.arg) {
time = parseInt(binding.arg)
}
el.handle = () => {
if (flg) return
flg = true
binding.value()
timerName = setTimeout(() => {
flg = false
}, time)
}
el.addEventListener('click', el.handle)
},
unbind(el,binding) {
el.removeEventListener('click',el.handle)
}
}防抖
/**
* 使用：
* <el-input v-debounce="handlerInput" v-model="inputValue"></el-input>
*/
const findEle = (parent, type) => {
return parent.tagName.toLowerCase() === type ? parent : parent.querySelector(type)
}
export const debounce = {
inserted: function (el, binding) {
if (typeof binding.value !== 'function') {
throw new Error('指令的参数必须是函数')
}
let timer
const $inp = findEle(el, 'input')
el.$inp = $inp
el.handle = () => {
if (timer) {
clearTimeout(timer)
}
timer = setTimeout(() => {
binding.value()
}, 1000)
}
el.addEventListener('input', el.handle)
},
unbind: function (el) {
el.$inp.removeEventListener('input', el.$inp.handle)
}
}复制
/**
* 使用
* <div v-copy="copyText">
* <el-button v-copy="copyText">复制</el-button>
* {
{copyText}}
* </div>
*/
const copy = {
bind (el, binding, vnode, oldVnode) {
const { value } = binding
el.$value = value
el.handler = () => {
if (!el.$value) {
// 值为空的时候，给出提示。可根据项目UI仔细设计
console.log('无复制内容')
return
}
// 动态创建 textarea 标签
const textarea = document.createElement('textarea')
// 将该 textarea 设为 readonly 防止 iOS 下自动唤起键盘，同时将 textarea 移出可视区域
textarea.readOnly = 'readonly'
textarea.style.position = 'absolute'
textarea.style.left = '-9999px'
// 将要 copy 的值赋给 textarea 标签的 value 属性
textarea.value = el.$value
// 将 textarea 插入到 body 中
document.body.appendChild(textarea)
// 选中值并复制
textarea.select()
const result = document.execCommand('Copy')
if (result) {
console.log('复制成功') // 可根据项目UI仔细设计
}
document.body.removeChild(textarea)
}
// 绑定点击事件，就是所谓的一键 copy 啦
el.addEventListener('click', el.handler)
},
// 当传进来的值更新的时候触发
componentUpdated (el, { value }) {
el.$value = value
},
// 指令与元素解绑的时候，移除事件绑定
unbind (el) {
el.removeEventListener('click', el.handler)
}
}
export default copy
拖拽
/**
* 使用
* <el-button v-draggable>拖拽按钮</el-button>
*/
const draggable = {
bind(el,binding) {
el.style.cursor = 'move'
},
inserted: function (el) {
el.onmousedown = function (e) {
// el.offsetTop/Left 元素到父元素上边/左边的距离
let disx = e.pageX - el.offsetLeft
let disy = e.pageY - el.offsetTop
document.onmousemove = function (e) {
let x = e.pageX - disx
let y = e.pageY - disy
let maxX = document.body.clientWidth - parseInt(window.getComputedStyle(el).width)
let maxY = document.body.clientHeight - parseInt(window.getComputedStyle(el).height)
if (x < 0) {
x = 0
} else if (x > maxX) {
x = maxX
}
if (y < 0) {
y = 0
} else if (y > maxY) {
y = maxY
}
el.style.left = x + 'px'
el.style.top = y + 'px'
}
document.onmouseup = function () {
document.onmousemove = document.onmouseup = null
}
}
},
}
export default draggable水印
/**
* 使用：
* <div v-waterMarker="{text:'lzg版权所有',textColor:'rgba(180, 180, 180, 0.4)'}"></div>
*/
function addWaterMarker (str, el, font, textColor) {
// 水印文字，父元素，字体，文字颜色
var can = document.createElement('canvas')
el.appendChild(can)
can.width = 200
can.height = 150
can.style.display = 'none'
var cans = can.getContext('2d')
cans.rotate((-20 * Math.PI) / 180)
cans.font = font || '16px Microsoft JhengHei'
cans.fillStyle = textColor || 'rgba(180, 180, 180, 0.3)'
cans.textAlign = 'left'
cans.textBaseline = 'Middle'
cans.fillText(str, can.width / 10, can.height / 2)
el.style.backgroundImage = 'url(' + can.toDataURL('image/png') + ')'
}
const waterMarker = {
bind: function (el, binding) {
addWaterMarker(binding.value.text, el, binding.value.font, binding.value.textColor)
}
}
export default waterMarker
权限控制
/**
* 使用: str 标志当前元素展示权限
* <el-button v-permission="str">按钮1</el-button>
*/
function checkArray(key) {
let arr = [1,2,3,4]
return arr.indexOf(key) > -1
}
const permission = {
inserted: function (el, binding) {
let permission = binding.value // 获取到 v-permission的值
if (permission) {
let hasPermission = checkArray(permission)
if (!hasPermission) {
// 没有权限 移除Dom元素
el.parentNode && el.parentNode.removeChild(el)
}
}
},
}
export default permission移除隐藏
/**
* 超出设置宽度显示文字提示指令
* 用法：v-overflow-tooltip / v-overflow-tooltip:width
* width 可选
* 只要当dom元素内容超出设置的宽度时，超出文字省略号显示，鼠标画上去有全部文字提示
*/
export default {
name: 'overflow-tooltip',
bind (el, binding) {
const width = binding.arg
if (width) {
el.style.width = `${width}px`
}
const style = {
whiteSpace: 'nowrap',
overflow: 'hidden',
textOverflow: 'ellipsis'
}
setStyle(el, style)
},
inserted (el, binding) {
addTooltip(el, binding)
},
unbind (el) {
if (!el.tooltip) return
el.removeEventListener('mouseenter', el.elMouseEnterHandler)
el.removeEventListener('mouseleave', el.elMouseOutHandler)
el.tooltip.destroy()
}
}
function addTooltip (el, binding) {
el.oldOffsetWidth = el.offsetWidth
if (!el.textWidth) {
// 计算文本宽度
const range = document.createRange()
range.setStart(el, 0)
range.setEnd(el, el.childNodes.length)
const rangeWidth = range.getBoundingClientRect().width
const padding = (parseInt(getStyle(el, 'paddingLeft'), 10) || 0) +
(parseInt(getStyle(el, 'paddingRight'), 10) || 0)
const textWidth = rangeWidth + padding
el.textWidth = textWidth
}
// 监听元素宽度变化
const resizeObserver = new ResizeObserver(entry => {
const target = entry[0].target
el.oldOffsetWidth !== target.offsetWidth && addTooltip(el, binding)
})
resizeObserver.observe(el)
// Math.max(el.offsetWidth, binding.arg) 处理offsetWidth不是设置宽度时的情况
if (el.textWidth > Math.max(el.offsetWidth, binding.arg || 0)) {
let tooltip = null
const elMouseEnterHandler = el.elMouseEnterHandler = debounce((event) => {
if (!tooltip) {
const tooltipContent = el.innerText || el.textContent
tooltip = new Tooltip()
tooltip.create(tooltipContent)
el.tooltip = tooltip
}
// 400为tootip最大宽度
tooltip.show(event, Math.min(el.textWidth, 400))
}, 300)
const elMouseOutHandler = el.elMouseOutHandler = debounce(() => {
tooltip && tooltip.hide()
}, 300)
el.addEventListener('mouseenter', elMouseEnterHandler)
el.addEventListener('mouseleave', elMouseOutHandler)
} else {
el.tooltip && el.tooltip.destroy()
el.elMouseEnterHandler && el.removeEventListener('mouseenter', el.elMouseEnterHandler)
el.elMouseOutHandler && el.removeEventListener('mouseleave', el.elMouseOutHandler)
}
}
function debounce(fn, delay = 500) {
let timer
return function() {
const th = this
const args = arguments
if (timer) {
clearTimeout(timer)
}
timer = setTimeout(function() {
timer = null
fn.apply(th, args)
}, delay)
}
}
const SPECIAL_CHARS_REGEXP = /([\:\-\_]+(.))/g
const MOZ_HACK_REGEXP = /^moz([A-Z])/
const ieVersion = Number(document.documentMode)
const camelCase = function(name) {
return name.replace(SPECIAL_CHARS_REGEXP, function(_, separator, letter, offset) {
return offset ? letter.toUpperCase() : letter
}).replace(MOZ_HACK_REGEXP, 'Moz$1')
}
const getStyle = ieVersion < 9 ? function(element, styleName) {
if (!element || !styleName) return null
styleName = camelCase(styleName)
if (styleName === 'float') {
styleName = 'styleFloat'
}
try {
switch (styleName) {
case 'opacity':
try {
return element.filters.item('alpha').opacity / 100
} catch (e) {
return 1.0
}
default:
return (element.style[styleName] || element.currentStyle ? element.currentStyle[styleName] : null)
}
} catch (e) {
return element.style[styleName]
}
} : function(element, styleName) {
if (!element || !styleName) return null
styleName = camelCase(styleName)
if (styleName === 'float') {
styleName = 'cssFloat'
}
try {
var computed = document.defaultView.getComputedStyle(element, '')
return element.style[styleName] || computed ? computed[styleName] : null
} catch (e) {
return element.style[styleName]
}
}
function setStyle(element, styleName, value) {
if (!element || !styleName) return
if (typeof styleName === 'object') {
for (const prop in styleName) {
if (styleName.hasOwnProperty(prop)) {
setStyle(element, prop, styleName[prop])
}
}
} else {
styleName = camelCase(styleName)
if (styleName === 'opacity' && ieVersion < 9) {
element.style.filter = isNaN(value) ? '' : 'alpha(opacity=' + value * 100 + ')'
} else {
element.style[styleName] = value
}
}
}
class Tooltip {
constructor () {
this.id = 'autoToolTip'
this.styleId = 'autoToolTipStyle'
this.tooltipContent = ''
this.styleElementText = `
#autoToolTip {
display: none;
position: absolute;
border-radius: 4px;
padding: 10px;
z-index: 99999;
font-size: 12px;
line-height: 1.2;
min-width: 10px;
max-width: 400px;
word-break: break-word;
color: #fff;
background: #303133;
transform-origin: center top;
}
#autoToolTip #arrow::after {
content: " ";
border-width: 5px;
position: absolute;
display: block;
width: 0;
height: 0;
border-color: transparent;
border-style: solid;
bottom: -10px;
left: calc(50% - 5px);
border-top-color: #303133;
}
`
this.tooltipElement = null
this.styleElement = null
this.showStatus = false
}
create (tooltipContent) {
this.tooltipContent = tooltipContent
const autoToolTip = document.querySelector('#' + this.id)
// 同时只添加一个
if (autoToolTip) {
this.tooltipElement = autoToolTip
return
}
const styleElement = document.createElement('style')
styleElement.id = this.styleId
styleElement.innerHTML = this.styleElementText
document.head.append(styleElement)
this.styleElement = styleElement
const element = document.createElement('div')
element.id = this.id
const arrowElement = document.createElement('div')
arrowElement.id = 'arrow'
element.append(arrowElement)
document.body.append(element)
this.tooltipElement = element
}
show (event, textWidth) {
if (this.showStatus) return
const targetElement = event.target
const targetElementRect = targetElement.getBoundingClientRect()
const { left, top, width } = targetElementRect
this.showStatus = true
this.removeTextNode()
this.tooltipElement.insertAdjacentText('afterbegin', this.tooltipContent)
const style = {
left: `${left - (textWidth + 20 - width) / 2}px`,
top: `${top - 38}px`,
display: 'block'
}
setStyle(this.tooltipElement, style)
}
hide () {
const style = {
left: '0px',
top: '0px',
display: 'none'
}
setStyle(this.tooltipElement, style)
this.removeTextNode()
this.showStatus = false
}
removeTextNode () {
const { firstChild } = this.tooltipElement
if (Object.prototype.toString.call(firstChild) === '[object Text]') {
this.tooltipElement.removeChild(firstChild)
}
}
destroy () {
const { tooltipElement, styleElement } = this
tooltipElement && tooltipElement.remove()
styleElement && styleElement.remove()
}
}
长按
/**
* 长按指令，使用：
* longpressFn 长按后执行的方法
* <el-button v-longpress="longpressFn">长按</el-button>
*/
const longpress = {
bind: function (el, binding, vNode) {
if (typeof binding.value !== 'function') {
throw new Error('callback must be a function')
}
// 定义变量
let pressTimer = null
// 创建计时器（ 2秒后执行函数 ）
const start = (e) => {
if (e.type === 'click' && e.button !== 0) {
return
}
if (pressTimer === null) {
pressTimer = setTimeout(() => {
handler()
}, 1500)
}
}
// 取消计时器
const cancel = (e) => {
if (pressTimer !== null) {
clearTimeout(pressTimer)
pressTimer = null
}
}
// 运行函数
const handler = (e) => {
binding.value(e)
}
// 添加事件监听器
el.addEventListener('mousedown', start)
el.addEventListener('touchstart', start)
// 取消计时器
el.addEventListener('click', cancel)
el.addEventListener('mouseout', cancel)
el.addEventListener('touchend', cancel)
el.addEventListener('touchcancel', cancel)
},
// 当传进来的值更新的时候触发
componentUpdated (el, { value }) {
el.$value = value
},
// 指令与元素解绑的时候，移除事件绑定
unbind (el) {
el.removeEventListener('click', el.handler)
}
}
export default longpress
input限制输入
/**
* 用法：v-limit-input:digit 只允许输入数字
* v-limip-input:reg="your reg expression" 支持传正则表达式，处理一些特殊的场景
*/
export default {
name: 'limit-input',
bind (el, binding, vnode, oldvnode) {
const typeMap = {
// 只输入数字
digit: /\D/g,
// 只输入正整数
positiveInteger: /^(0+)|\D+/g,
// 只输入基本中文
chinese: /[^\u4E00-\u9FA5]/g,
// 只输入中文英文字母
chineseAlphabet: /[^\u4E00-\u9FA5A-Za-z]/g,
// 只输入大写字母及数字
uppercaseLetterDigit: /[^A-Z0-9]/g,
// 只输入字母及数字
letterDigit: /[^0-9a-zA-Z]/,
// 只输入合法的金额格式
price: /(\d+)(\.\d{0,2})?/
// price: /([^0-9.])|((?<=\d+\.\d{2})\d+)|((?<=^0)0+)|(^0(?=[1-9]))|((?<=\.\d*)\.)|(^\.)/g
}
const { arg, value } = binding
if (!arg) {
throw Error('one arg is required')
}
if (arg && !typeMap.hasOwnProperty(arg)) {
throw Error('arg is not in typeMap')
}
if (arg === 'reg' && !value) {
throw Error('reg arg requires a reg expression value')
}
const tagName = el.tagName.toLowerCase()
const input = tagName === 'input' ? el : el.querySelector('input')
const regKey = arg || (arg === 'reg' && value)
// 输入法气泡窗弹出，开始拼写
el.compositionstartHandler = function () {
el.inputLocking = true
}
// 输入法气泡窗关闭，输入结束
el.compositionendHandler = function () {
el.inputLocking = false
input.dispatchEvent(new Event('input'))
}
el.inputHandler = function (e) {
if (el.inputLocking) return
const oldValue = e.target.value
const newValue = oldValue.replace(typeMap[regKey], '')
// price 正则在safar报错，导致页面无法打开，新增的判断
if (regKey === 'price') {
const rege = /(\d+)(\.\d{0,2})?/
const target = e.target
if (rege.test(target.value)) {
const value = target.value.match(rege)[0]
if (value.split('.').length === 1 && target.value === value) {
input.value = Number(value)
} else if (target.value !== value) {
input.value = value
input.dispatchEvent(new Event('input')) // 通知v-model更新
}
} else {
input.value = ''
input.dispatchEvent(new Event('input'))
}
} else {
// 判断是否需要更新，避免进入死循环
if (newValue !== oldValue) {
input.value = newValue
input.dispatchEvent(new Event('input')) // 通知v-model更新
}
}
}
input.addEventListener('compositionstart', el.compositionstartHandler)
input.addEventListener('compositionend', el.compositionendHandler)
input.addEventListener('input', el.inputHandler)
},
unbind (el) {
const tagName = el.tagName.toLowerCase()
const input = tagName === 'input' ? el : el.querySelector('input')
input.removeEventListener('compositionstart', el.compositionstartHandler)
input.removeEventListener('compositionend', el.compositionendHandler)
input.removeEventListener('input', el.inputHandler)
}
}
select组件上拉加载
/**
* element select添加上拉加载更多指令
* 使用：
* v-el-select-loadmore="执行的事件名"
*/
export default {
name: 'el-select-loadmore',
bind (el, binding) {
// 获取element-ui定义好的scroll盒子
const SELECTWRAP_DOM = el.querySelector('.el-select-dropdown .el-select-dropdown__wrap');
SELECTWRAP_DOM.addEventListener('scroll', function () {
const CONDITION = this.scrollHeight - this.scrollTop <= (this.clientHeight + 2);
if (CONDITION) {
binding.value()
}
})
}
}<!-- 使用 select组件需使用form-item包裹，且需设置样式 -->
<FormItem style="padding-right: 10px; transform: translate(-10px, 0px)">
<el-select v-model.lazy="queryParams.platformName" v-el-select-loadmore="loRaLoadMoreFn" >
<el-option v-for="item in loraNumList"
:value="item.platformName"
:label="item.platformName"
:key="item.appKey"
></el-option>
</el-select>
</FormItem>