我的项目中使用了scss,elementui官网提供了解决方案如下:
在项目中改变 SCSS 变量
Element 的 theme-chalk 使用 SCSS 编写,如果你的项目也使用了 SCSS,那么可以直接在项目中改变 Element 的样式变量。
1. 新建一个样式文件,例如 element-variables.scss,写入以下内容:
/* 改变主题色变量 */
$--color-primary: teal;
/* 改变 icon 字体路径变量,必需 */
$--font-path: '~element-ui/lib/theme-chalk/fonts';
@import "~element-ui/packages/theme-chalk/src/index";
2. 之后,在项目的入口文件中,直接引入以上样式文件即可(无需引入 Element 编译好的 CSS 文件):
import Vue from 'vue'
import Element from 'element-ui'
import './element-variables.scss'
Vue.use(Element)
需要注意的是,覆盖字体路径变量是必需的,将其赋值为 Element 中 icon 图标所在的相对路径即可。
以上方法,我们修改主题色变量 $--color-primary 的值,然后在项目入口文件 main.js 中引入该样式文件,覆盖elementui的css文件,即可实现换肤。
那么怎么做到自定义任意颜色的主题呢?大致思路如下:
- 1.使用 el-color-picker 组件,供用户选择颜色
- 2.监听颜色的变化,创建 style 标签,生成样式内容
- 3.将创建好的样式内容插入 head 中
实际步骤如下:
- 1.在项目中新建一个scss文件,比如就叫 elementui-variables.scss
内容如下:
/* theme color */
$--color-primary: #1890ff;
$--color-success: #13ce66;
$--color-warning: #FFBA00;
$--color-danger: #ff4949;
// $--color-info: #1E1E1E;
$--button-font-weight: 400;
// $--color-text-regular: #1f2d3d;
$--border-color-light: #dfe4ed;
$--border-color-lighter: #e6ebf5;
$--table-border:1px solid #dfe6ec;
/* icon font path, required */
$--font-path: '~element-ui/lib/theme-chalk/fonts';
// @import "~element-ui/packages/theme-chalk/src/index";
:export {
theme: $--color-primary;
}
- 2.考虑到项目全局都有可能使用到颜色这个变量,所以决定用vuex,如图:新建文件 settings.js
settings.js 内容如下,theme 的初始值为 elementui-variables.scss 中定义的theme。
import variables from '@/styles/element-variables.scss'
const settings = {
state: {
theme: variables.theme,
},
mutations: {
CHANGE_SETTING: (state, { key, value }) => {
if (state.hasOwnProperty(key)) {
state[key] = value
}
}
},
actions: {
changeSetting({ commit }, data) {
commit('CHANGE_SETTING', data)
}
}
}
export default settings
- 3.新建一个组件(一般在components目录下,我将它命名为ThemePicker),用于监听颜色变量 theme 的改变,然后 getHandler 函数生成样式文件,插入head中。在这里我遇到了一个问题,如果使用 document.head.appendChild(styleTag) ,页面就会变成一片空白,然后我就在想有可能是样式的顺序导致一些有用的样式被覆盖了,所以我就讲它改为 document.getElementsByTagName('style')[0].insertBefore(styleTag, null) ; 完美解决问题。
ThemePicker文件内容如下,可以看到默认的颜色是 this.$store.state.settings.theme ,它是在 elementui-variables.scss 中定义的。
<template>
<el-color-picker
v-model="theme"
:predefine="['#409EFF', '#67C23A', '#E6A23C', '#f5222d', '#11a983', '#13c2c2', '#6959CD', '#434f5d', ]"
class="theme-picker"
popper-class="theme-picker-dropdown" title="换肤"
/>
</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: ''
}
},
computed: {
defaultTheme() {
return this.$store.state.settings.theme
}
},
watch: {
defaultTheme: {
handler: function(val, oldVal) {
this.theme = val
},
immediate: true
},
async theme(val) {
const oldVal = this.chalk ? this.theme : ORIGINAL_THEME
if (typeof val !== 'string') return
const themeCluster = this.getThemeCluster(val.replace('#', ''))
const originalCluster = this.getThemeCluster(oldVal.replace('#', ''))
// console.log(themeCluster, originalCluster)
const $message = this.$message({
message: '更换主题中...',
customClass: 'theme-message',
type: 'success',
duration: 0,
iconClass: 'el-icon-loading'
})
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)
document.getElementsByTagName('style')[0].insertBefore(styleTag, null)
}
styleTag.innerText = newStyle
}
}
if (!this.chalk) {
const url = `https://unpkg.com/element-ui@${version}/lib/theme-chalk/index.css`
await this.getCSSString(url, 'chalk')
}
const chalkHandler = getHandler('chalk', 'chalk-style')
chalkHandler()
const styles = [].slice.call(document.querySelectorAll('style'))
.filter(style => {
const text = style.innerText
return new RegExp(oldVal, 'i').test(text) && !/Chalk Variables/.test(text)
})
styles.forEach(style => {
const { innerText } = style
if (typeof innerText !== 'string') return
style.innerText = this.updateStyle(innerText, originalCluster, themeCluster)
})
this.$emit('change', val)
$message.close()
}
},
methods: {
updateStyle(style, oldCluster, newCluster) {
let newStyle = style
oldCluster.forEach((color, index) => {
newStyle = newStyle.replace(new RegExp(color, 'ig'), newCluster[index])
})
return newStyle
},
getCSSString(url, variable) {
return new Promise(resolve => {
const xhr = new XMLHttpRequest()
xhr.onreadystatechange = () => {
if (xhr.readyState === 4 && xhr.status === 200) {
this[variable] = xhr.responseText.replace(/@font-face{[^}]+}/, '')
resolve()
}
}
xhr.open('GET', url)
xhr.send()
})
},
getThemeCluster(theme) {
const tintColor = (color, tint) => {
let red = parseInt(color.slice(0, 2), 16)
let green = parseInt(color.slice(2, 4), 16)
let blue = parseInt(color.slice(4, 6), 16)
if (tint === 0) { // when primary color is in its rgb space
return [red, green, blue].join(',')
} else {
red += Math.round(tint * (255 - red))
green += Math.round(tint * (255 - green))
blue += Math.round(tint * (255 - blue))
red = red.toString(16)
green = green.toString(16)
blue = blue.toString(16)
return `#${red}${green}${blue}`
}
}
const shadeColor = (color, shade) => {
let red = parseInt(color.slice(0, 2), 16)
let green = parseInt(color.slice(2, 4), 16)
let blue = parseInt(color.slice(4, 6), 16)
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}${blue}`
}
const clusters = [theme]
for (let i = 0; i <= 9; i++) {
clusters.push(tintColor(theme, Number((i / 10).toFixed(2))))
}
clusters.push(shadeColor(theme, 0.1))
return clusters
}
}
}
</script>
<style>
.theme-picker {
float: left;
margin-top: 10px;
}
.theme-message,
.theme-picker-dropdown {
z-index: 99999 !important;
}
.theme-picker .el-color-picker__trigger {
height: 26px !important;
width: 26px !important;
padding: 2px;
}
.theme-picker-dropdown .el-color-dropdown__link-btn {
display: none;
}
</style>
页面上有些组件的样式可能是自定义的,不会随 theme 一起变化,可这么实现:
<router-link v-for="tag in Array.from(visitedViews)" ref="tag" :style="isActive(tag)?{
'background-color': theme,
'color': '#ffffff',
'border-color': theme
}:{}"
:to="tag" :key="tag.path" class="tags-view-item">
{{ tag.name }}
<span class="el-icon-close" @click.prevent.stop="closeSelectedTag(tag)"/>
</router-link>
computed: {
//...,
theme() {
return this.$store.state.settings.theme
}
},
- 4.最后在页面上使用 ThemePicker 组件即可:
实际效果录屏: