基于element-ui 动态换肤的代码详解
作者:rogerwu
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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