基于element-ui 动态换肤的代码详解
1、在安装好element-ui@2.x 以后,首先安装sass-loader
- npm i sass-loader node-sass -D
2、安装element-theme
- npm i element-theme -D
3、安装theme-chalk
- npm i element-theme-chalk -D
- # or from github
- npm i https://github.com/ElementUI/theme-chalk -D
4、初始化变量文件
- et -i // 默认的文件是element-variables.scss,也可以自定义文件名 et --init [file path]
安装成功以后,在项目里会自动生成一个element-variables.scss 文件,如下图:
里面定义的是所有的颜色变量
当然,这一步也有可能失败,命令行提示找不到et 这个命令。这个时候需要按照步骤一,重新装一下sass-loader
5、修改变量
直接编辑 element-variables.scss 文件,例如修改主题色为红色
6、编译主题
保存文件后,到命令行里执行 et 编译主题,如果你想启用 watch 模式,实时编译主题,增加 -w 参数;如果你在初始化时指定了自定义变量文件,则需要增加 -c 参数,并带上你的变量文件名
此时,项目中会自动生成一个theme文件夹,里面是编译后所有的字体文件和样式文件
7、引入自定义主题
默认情况下编译的主题目录是放在 ./theme 下,你可以通过 -o 参数指定打包目录。像引入默认主题一样,在代码里直接引用 theme/index.css 文件即可。
- import '../theme/index.css'
- import ElementUI from 'element-ui'
- import Vue from 'vue'
- Vue.use(ElementUI)
启动项目,会发现原来默认的蓝色会变成红色
官网提供的这种方法仅适用于一次性的更改全局主题颜色,如果想实现官网2.0版本右上角,使用 ColorPicker 颜色选择器 动态换肤。那么建议参考vue-element-admin,作者的 《手摸手,带你用vue撸后台》系列文章非常精彩
- ThemePicker.vue
- <template>
- <el-tooltip effect="dark" content="theme" placement="bottom">
- <el-color-picker
- v-model="theme"
- class="theme-picker"
- size="small"
- popper-class="theme-picker-dropdown"/>
- </el-tooltip>
- </template>
- <script>
- const version = require('element-ui/package.json').version // element-ui version from node_modules
- const ORIGINAL_THEME = '#409EFF' // default color
- export default {
- data() {
- return {
- chalk: '', // content of theme-chalk css
- theme: ORIGINAL_THEME
- }
- },
- watch: {
- theme(val, oldVal) {
- if (typeof val !== 'string') return
- const themeCluster = this.getThemeCluster(val.replace('#', ''))
- const originalCluster = this.getThemeCluster(oldVal.replace('#', ''))
- console.log(themeCluster, originalCluster)
- const getHandler = (variable, id) => {
- return () => {
- const originalCluster = this.getThemeCluster(ORIGINAL_THEME.replace('#', ''))
- const newStyle = this.updateStyle(this[variable], originalCluster, themeCluster)
- let styleTag = document.getElementById(id)
- if (!styleTag) {
- styleTag = document.createElement('style')
- styleTag.setAttribute('id', id)
- document.head.appendChild(styleTag)
- }
- styleTag.innerText = newStyle
- }
- }
- const chalkHandler = getHandler('chalk', 'chalk-style')
- if (!this.chalk) {
- const url = `https://unpkg.com/element-ui@${version}/lib/theme-chalk/index.css`
- this.getCSSString(url, chalkHandler, 'chalk')
- } else {
- chalkHandler()
- const styles = [].slice.call(document.querySelectorAll('style'))
- .filter(style => {
- const text = style.innerText
- return new RegExp(oldVal, 'i').test(text) && !/Chalk Variables/.test(text)
- })
- styles.forEach(style => {
- const { innerText } = style
- if (typeof innerText !== 'string') return
- style.innerText = this.updateStyle(innerText, originalCluster, themeCluster)
- })
- this.$message({
- message: '换肤成功',
- type: 'success'
- methods: {
- updateStyle(style, oldCluster, newCluster) {
- let newStyle = style
- oldCluster.forEach((color, index) => {
- newStyle = newStyle.replace(new RegExp(color, 'ig'), newCluster[index])
- return newStyle
- },
- getCSSString(url, callback, variable) {
- const xhr = new XMLHttpRequest()
- xhr.onreadystatechange = () => {
- if (xhr.readyState === 4 && xhr.status === 200) {
- this[variable] = xhr.responseText.replace(/@font-face{[^}]+}/, '')
- callback()
- xhr.open('GET', url)
- xhr.send()
- getThemeCluster(theme) {
- const tintColor = (color, tint) => {
- let red = parseInt(color.slice(0, 2), 16)
- let green = parseInt(color.slice(2, 4), 16)
- let blue = parseInt(color.slice(4, 6), 16)
- if (tint === 0) { // when primary color is in its rgb space
- return [red, green, blue].join(',')
- } else {
- red += Math.round(tint * (255 - red))
- green += Math.round(tint * (255 - green))
- blue += Math.round(tint * (255 - blue))
- red = red.toString(16)
- green = green.toString(16)
- blue = blue.toString(16)
- return `#${red}${green}${blue}`
- const shadeColor = (color, shade) => {
- red = Math.round((1 - shade) * red)
- green = Math.round((1 - shade) * green)
- blue = Math.round((1 - shade) * blue)
- red = red.toString(16)
- green = green.toString(16)
- blue = blue.toString(16)
- return `#${red}${green}${blue}`
- const clusters = [theme]
- for (let i = 0; i <= 9; i++) {
- clusters.push(tintColor(theme, Number((i / 10).toFixed(2))))
- clusters.push(shadeColor(theme, 0.1))
- return clusters
- }
- }
- </script>
- Navbar.vue
- <template>
- <el-menu class="navbar" mode="horizontal">
- <hamburger
- class="hamburger-container"
- :toggleClick="toggleSideBar"
- :isActive="!sidebar.opened">
- </hamburger>
- <div class="right-menu">
- <screenfull class="screenfull"></screenfull>
- <div class="lang">
- <el-dropdown>
- <i class="iconfont icon-language4"></i>
- <el-dropdown-menu slot="dropdown">
- <el-dropdown-item @click.native="toggleLang('zh')" :disabled="$i18n.locale == 'zh'">中文</el-dropdown-item>
- <el-dropdown-item @click.native="toggleLang('en')" :disabled="$i18n.locale == 'en'">English</el-dropdown-item>
- </el-dropdown-menu>
- </el-dropdown>
- </div>
- <theme-picker></theme-picker>
- </div>
- </el-menu>
- </template>
以上demo代码地址:https://github.com/frwupeng517/element-admin
Element-UI 官方文档地址:http://element-cn.eleme.io/#/zh-CN/component/custom-theme
PanJiachen Git地址:https://github.com/PanJiaChen/vue-element-admin
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