Vuejs でよく使用されるカスタム命令をいくつか共有します (概要)

export default function (el, binding) { const s = document.styleSheets[document.styleSheets.length - 1] const DEFAULT = -10 // 默认向外扩展10px const ruleStr = `content:"";position:absolute;top:-${top || DEFAULT}px;bottom:-${bottom || DEFAULT}px;right:-${right || DEFAULT}px;left:-${left || DEFAULT}px;` const [top, right, bottom, left] = binding.expression && binding.expression.split(',') || [] const classNameList = el.className.split(' ') el.className = classNameList.includes('expand_click_range') ? classNameList.join(' ') : [...classNameList, 'expand_click_range'].join(' ') el.style.position = el.style.position || "relative" if (s.insertRule) { s.insertRule('.expand_click_range::before' + '{' + ruleStr + '}', s.cssRules.length) } else { /* IE */ s.addRule('.expand_click_range::before', ruleStr, -1) } }

 点击范围扩大

export default { bind (el, binding) { // 双击触发复制 if (binding.modifiers.dblclick) { el.addEventListener('dblclick', () => handleClick(el.innerText)) el.style.cursor = 'copy' } // 点击icon触发复制 else if (binding.modifiers.icon) { if (el.hasIcon) return const iconElement = document.createElement('i') iconElement.setAttribute('class', 'el-icon-document-copy') iconElement.setAttribute('style', 'margin-left:5px') el.appendChild(iconElement) el.hasIcon = true iconElement.addEventListener('click', () => handleClick(el.innerText)) iconElement.style.cursor = 'copy' } // 单击触发复制 else { el.addEventListener('click', () => handleClick(el.innerText)) el.style.cursor = 'copy' } } } function handleClick (text) { // 创建元素 if (!document.getElementById('copyTarget')) { const copyTarget = document.createElement('input') copyTarget.setAttribute('style', 'position:fixed;top:0;left:0;opacity:0;z-index:-1000;') copyTarget.setAttribute('id', 'copyTarget') document.body.appendChild(copyTarget) } // 复制内容 const input = document.getElementById('copyTarget') input.value = text input.select() document.execCommand('copy') // alert('复制成功') }

 单击复制 
 
 双击复制 
 
 icon复制 

import screenfull from 'screenfull' export default { bind (el, binding) { if (binding.modifiers.icon) { if (el.hasIcon) return // 创建全屏图标 const iconElement = document.createElement('i') iconElement.setAttribute('class', 'el-icon-full-screen') iconElement.setAttribute('style', 'margin-left:5px') el.appendChild(iconElement) el.hasIcon = true } el.style.cursor = el.style.cursor || 'pointer' // 监听点击全屏事件 el.addEventListener('click', () => handleClick()) } } function handleClick () { if (!screenfull.isEnabled) { alert('浏览器不支持全屏') return } screenfull.toggle() }

 全屏 

import Vue from 'vue' export default function (el, binding) { if (el.hasIcon) return const iconElement = structureIcon(binding.arg, binding.value) el.appendChild(iconElement) el.hasIcon = true } function structureIcon (content, attrs) { // 拼接绑定属性 let attrStr = '' for (let key in attrs) { attrStr += `${key}=${attrs[key]} ` } const a = `` // 创建构造器 const tooltip = Vue.extend({ template: a }) // 创建一个 tooltip 实例并返回 dom 节点 const component = new tooltip().$mount() return component.$el }

 提示 

 提示1
 
 提示2 

data() { return { tootipParams: { placement: 'top', effect: 'light', } } }

width: 100px; whiteSpace: nowrap overflow: hidden; textOverflow: ellipsis;

 需要省略的文字是阿萨的副本阿萨的副本阿萨的副本阿萨的副本

export default { bind (el, binding, vnode) { // 响应点击后滚动到元素顶部 el.addEventListener('click', () => { const target = binding.arg ? document.getElementById(binding.arg) : window target.scrollTo({ top: 0, behavior: 'smooth' }) }) }, update (el, binding, vnode) { // 滚动到达参数值才出现绑定指令的元素 const target = binding.arg ? document.getElementById(binding.arg) : window if (binding.value) { target.addEventListener('scroll', (e) => { if (e.srcElement.scrollTop > binding.value) { el.style.visibility = 'unset' } else { el.style.visibility = 'hidden' } }) } // 判断初始化状态 if (target.scrollTop < binding.value) { el.style.visibility = 'hidden' } }, unbind (el) { const target = binding.arg ? document.getElementById(binding.arg) : window target.removeEventListener('scroll') el.removeEventListener('click') } }

 回到顶部 

 回到顶部 

import Vue from "vue"; export default { update (el, binding, vnode) { el.style.position = el.style.position || 'relative' const { offsetHeight, offsetWidth } = el const { visible, content, img } = binding.value const image = img ? `` : '' const defaultStyle = "position:absolute;top:0;left:0;z-index:9999;background:#fff;display:flex;justify-content: center;align-items: center;" const empty = Vue.extend({ template: `
 
 
${image}
 
${content || '暂无数据'}
 
 
` }) const component = new empty().$mount().$el if (visible) { el.appendChild(component) } else { el.removeChild(el.lastChild) } }, }

 原本内容

emptyValue = { content: '暂无列表', img: require('../../assets/images/blue_big.png'), visible: true, },

import Vue from 'vue' const SUCCESS = '#72c140' const ERROR = '#ed5b56' const WARNING = '#f0af41' const INFO = '#4091f7' const HEIGHT = 20 let flag = false export default { update (el, binding, vnode) { const { modifiers, value } = binding const modifiersKey = Object.keys(modifiers) let isDot = modifiersKey.includes('dot') let backgroundColor = '' if (modifiersKey.includes('success')) { backgroundColor = SUCCESS } else if (modifiersKey.includes('warning')) { backgroundColor = WARNING } else if (modifiersKey.includes('info')) { backgroundColor = INFO } else { backgroundColor = ERROR } const targetTemplate = isDot ? `
` : `
${value}
` el.style.position = el.style.position || 'relative' const badge = Vue.extend({ template: targetTemplate }) const component = new badge().$mount().$el if (flag) { el.removeChild(el.lastChild) } el.appendChild(component) flag = true } }

export default { let _el = el document.onselectstart = function() { return false //禁止选择网页上的文字 } _el.onmousedown = e => { let disX = e.clientX - _el.offsetLeft //鼠标按下，计算当前元素距离可视区的距离 let disY = e.clientY - _el.offsetTop document.onmousemove = function(e){ let l = e.clientX - disX let t = e.clientY - disY; _el.style.left = l + "px" _el.style.top = t + "px" } document.onmouseup = e => { document.onmousemove = document.onmouseup = null } return false } }

 支持拖拽的元素 

export default { bind(el, binding) { let width = '', height = ''; function isReize() { const style = document.defaultView.getComputedStyle(el); if (width !== style.width || height !== style.height) { binding.value(); // 执行传入的方法 } width = style.width; height = style.height; } el.__timer__ = setInterval(isReize, 300); // 周期性监听元素是否改变 }, unbind(el) { clearInterval(el.__timer__); } }

// 传入 resize() 方法 

export default { update (el, binding, vnode) { const { value, modifiers } = binding if (!value) return let formatValue = value if (modifiers.toFixed) { formatValue = value.toFixed(2) } console.log(formatValue) if (modifiers.price) { formatValue = formatNumber(formatValue) } el.innerText = formatValue }, } function formatNumber (num) { num += ''; let strs = num.split('.'); let x1 = strs[0]; let x2 = strs.length > 1 ? '.' + strs[1] : ''; var rgx = /(\d+)(\d{3})/; while (rgx.test(x1)) { x1 = x1.replace(rgx, '$1' + ',' + '$2'); } return x1 + x2 }

 123 

├── src | ├── directive | | ├── index.js | | ├── backtop.js | | ├── badge.js | | ├── copy.js | | ├── ellipsis.js | | ├── empty.js | | ├── expandClick.js | | ├── screenfull.js | | └── tooltips.js | ├── main.js

import Vue from 'vue' import ellipsis from './ellipsis' // 引入指令 // import other directives const directives = { ellipsis // other directives } Object.keys(directives).forEach(name => Vue.directive(name, directives[name]))