vue-element如何實(shí)現(xiàn)動(dòng)態(tài)換膚存儲(chǔ)
需要實(shí)現(xiàn)的效果
選擇顏色塊或者顏色選擇器切換網(wǎng)站主題色,選擇主題后保存到本地,下次打開(kāi)頁(yè)面是緩存的主題色
原理
根據(jù)ElementUI官網(wǎng)的自定義主題,新建一個(gè)樣式文件:element-variables(或者參考官網(wǎng)生成),在文件中寫(xiě)入:
/* 改變主題色變量 */ $--color-primary: #409eff; $--color-success: #67c23a; /*....還可以定義更多變量*/ /* 改變 icon 字體路徑變量,必需 */ $--font-path: '~element-ui/lib/theme-chalk/fonts'; @import "~element-ui/packages/theme-chalk/src/index"; //主要的一步: :export { theme: $--color-primary; }
在項(xiàng)目store文件夾中新建theme.js文件,用于存儲(chǔ)主題色變化狀態(tài),代碼如下
//引入element-variables文件,文件路徑根據(jù)自己項(xiàng)目存放位置來(lái) import variables from '@/assets/css/element-variables.scss' const state = { theme: variables.theme } const getters = { theme: function (state) { return state.theme; } }; const mutations = { CHANGE_SETTING: (state, { key, value }) => { // eslint-disable-next-line no-prototype-builtins if (state.hasOwnProperty(key)) { state[key] = value } } } const actions = { changeSetting({ commit }, data) { commit('CHANGE_SETTING', data) } } export default { namespaced: true, state, mutations, actions, getters }
然后在store.js中引入theme.js
import Vue from 'vue'; import Vuex from 'vuex'; import theme from '@/store/theme.js'; Vue.use(Vuex); export default new Vuex.Store({ modules: { theme } });
切換主圖部分template代碼如下:
<el-form-item label="可選主題" label-width="140px"> <div class="color-box"> <div v-for="(item,i) in themeArr" :key="i" :class="['color-item',theme===item?'active':'']" :style="{backgroundColor:item}" @click="changeTheme(item)"> <span v-if="theme===item" class="iconfont icon-f-right"></span> </div> </div> </el-form-item> <el-form-item label="自定義主題" label-width="140px"> <el-color-picker v-model="theme" :predefine="['#409EFF', '#1890ff', '#304156','#212121','#11a983', '#13c2c2', '#6959CD', '#f5222d', ]" class="theme-picker" popper-class="theme-picker-dropdown" /> </el-form-item>
script代碼
const version = require('element-ui/package.json').version // element-ui version from node_modules const ORIGINAL_THEME = '#409EFF' // default color export default { data() { return { themeArr: ['#409EFF','#202225','#F56C6C','#FFAB42','#17a969','#888C8F'], chalk: '', theme: ORIGINAL_THEME, } }, watch: { //異步監(jiān)聽(tīng)theme的變化 async 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 $message = this.$message({ message: ' Compiling the theme', 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) } styleTag.innerText = newStyle } } // 初次進(jìn)入或刷新時(shí)動(dòng)態(tài)加載CSS文件 if (!this.chalk) { const url = `https://unpkg.com/element-ui@${version}/lib/theme-chalk/index.css` await this.getCSSString(url, 'chalk') } const chalkHandler = getHandler('chalk', 'chalk-style') chalkHandler() const styles = [].slice.call(document.querySelectorAll('style')) .filter(style => { const text = style.innerText return new RegExp(oldVal, 'i').test(text) && !/Chalk Variables/.test(text) }) styles.forEach(style => { const { innerText } = style if (typeof innerText !== 'string') return style.innerText = this.updateStyle(innerText, originalCluster, themeCluster) }) // 將修改的主題保存到本地,下次打開(kāi)頁(yè)面是保存的主題色 localStorage.setItem('theme',val) //調(diào)用vuex中改變主題色方法 this.$store.dispatch('theme/changeSetting', { key: 'theme', value: 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}${blue}` } const clusters = [theme] for (let i = 0; i <= 9; i++) { clusters.push(tintColor(theme, Number((i / 10).toFixed(2)))) } clusters.push(shadeColor(theme, 0.1)) return clusters }, // 顏色塊點(diǎn)擊切換主題事件 changeTheme(item) { this.theme = item this.$store.dispatch('theme/changeSetting', { key: 'theme', value: item }) }, }, mounted() { //從本地存儲(chǔ)獲取保存的主題 if(localStorage.getItem("theme")) { this.theme = localStorage.getItem("theme") this.$store.dispatch('theme/changeSetting', { key: 'theme', value: this.theme }) } } }
顏色塊選擇樣式style:
.color-box { display: flex; flex-wrap: wrap; .color-item { position: relative; margin: 2px; width: 34px; height: 34px; border-radius: 3px; border: 2px solid transparent; cursor: pointer; span { position: absolute; right: 0; top: 0; width: 15px; height: 15px; background-color: #000; color: #fff; font-size: 10px; text-align: center; } &.active { border-color: #000; } } }
最后感謝:vue-element-admin作者 本實(shí)現(xiàn)方案借鑒于此
總結(jié)
以上為個(gè)人經(jīng)驗(yàn),希望能給大家一個(gè)參考,也希望大家多多支持腳本之家。
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