vue+element实现动态换肤的示例代码
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2022-03-07 07:53:12
有时候一个项目的主题并不能满足所有人的审美,这时候换肤功能就很友好,本项目基于vue+element实现后台管理项目的换肤功能1.创建换肤组件
有时候一个项目的主题并不能满足所有人的审美,这时候换肤功能就很友好,本项目基于vue+element实现后台管理项目的换肤功能
1.创建换肤组件
<template> <el-color-picker class="theme-picker" popper-class="theme-picker-dropdown" v-model="theme" :predefine="predefinecolors" ></el-color-picker> </template> <script> const version = require("element-ui/package.json").version; // element-ui version from node_modules const original_theme = "#409eff"; // default color export default { name: "themepicker", props: { default: { // 初始化主题,可由外部传入 type: string // default: '#2668b1' // default: `${localstorage.getitem("tremepackers")==null?"#c60404":localstorage.getitem("tremepackers")}` } // size: { // 初始化主题,可由外部传入 // type: string, // default: 'small' // }, }, data() { return { chalk: "", // content of theme-chalk css theme: original_theme, showsuccess: true, // 是否弹出换肤成功消息 predefinecolors: [ "#2668b1", "#52b493", "#429798", "#32789c", "#1944a5", "#5944bc", "#995dcd", "#ce7e5b", "#ee8b9b", "#283551" ] }; }, mounted() { this.theme = this.defaulttheme; // this.$emit('onthemechange', this.theme) this.showsuccess = true; }, computed: { defaulttheme() { return this.$store.state.theme; } }, watch: { async theme(val, oldval) { if (typeof val !== "string") return; const themecluster = this.getthemecluster(val.replace("#", "")); const originalcluster = this.getthemecluster(oldval.replace("#", "")); const gethandler = (variable, id) => { return () => { const originalcluster = this.getthemecluster( original_theme.replace("#", "") ); const newstyle = this.updatestyle( this[variable], originalcluster, themecluster ); let styletag = document.getelementbyid(id); if (!styletag) { styletag = document.createelement("style"); styletag.setattribute("id", id); // document.head.appendchild(styletag) document .getelementsbytagname("style")[0] .insertbefore(styletag, null); } styletag.innertext = newstyle; }; }; const chalkhandler = gethandler("chalk", "chalk-style"); if (!this.chalk) { const url = `../../assets/style/theme/index.css`;//本地css样式地址 // const url = `./dist/index.css`;//项目打包后css地址(原文件放入public文件夹中) // const url = `https://unpkg.com/element-ui@${version}/lib/theme-chalk/index.css`;//如果是公司内网,此网址则不适用 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.$store.commit("themcolor", val);//将更换的颜色存入store this.$emit("onthemechange", val); // 响应外部操作 //存入localstorage // localstorage.setitem('tremepackers',val); // if(this.showsuccess) { // this.$message({ // message: '换肤成功', // type: 'success' // }) // } else { // this.showsuccess = true // } } }, methods: { updatestyle(style, oldcluster, newcluster) { let newstyle = style; oldcluster.foreach((color, index) => { newstyle = newstyle.replace(new regexp(color, "ig"), newcluster[index]); }); return newstyle; }, getcssstring(url, callback, variable) { const xhr = new xmlhttprequest(); xhr.onreadystatechange = () => { if (xhr.readystate === 4 && xhr.status === 200) { this[variable] = xhr.responsetext.replace(/@font-face{[^}]+}/, ""); callback(); } }; xhr.open("get", url); xhr.send(); }, getthemecluster(theme) { const tintcolor = (color, tint) => { let red = parseint(color.slice(0, 2), 16); let green = parseint(color.slice(2, 4), 16); let blue = parseint(color.slice(4, 6), 16); if (tint === 0) { // when primary color is in its rgb space return [red, green, blue].join(","); } else { red += math.round(tint * (255 - red)); green += math.round(tint * (255 - green)); blue += math.round(tint * (255 - blue)); red = red.tostring(16); green = green.tostring(16); blue = blue.tostring(16); return `#${red}${green}${blue}`; } }; const shadecolor = (color, shade) => { 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 .el-color-picker__trigger { vertical-align: middle; } .theme-picker-dropdown .el-color-dropdown__link-btn { display: none; } .el-color-picker--small .el-color-picker__trigger { border: none; } </style>
上面这块代码值得注意,红框里的代码是在head里所有节点后插入一个新的style标签,打包后优先级较高,但有个问题,有些地方的颜色直接消失变成空白影响了样式,于是改成绿框里的代码,但绿框里的代码打包后优先级会低于原来样式颜色的而优先级,所以需要根据项目调样式优先级
这块的代码也需要注意,如果公司直接使用的外网那么直接使用第三个url就行,如果公司使用的内网访问不了外部网页那么可以通过第三条url下载项目对应element版本的css样式,把css文件放到项目里,但要注意放到不会被编译的问价夹里,我项目用的是vue cli4,所以我动态转换的css文件放在public文件夹里,放到assets问价夹中样式文件会被编译,因而路径会报404,并且这块使用的url是文件打包编译后样式的路径,这是值得注意的地方
2.如果项目中有的样式颜色没有用到element,可以把颜色缓存到vuex里,然后在具体逐渐里通过计算属性获取再在样式上动态绑定
vuex:
使用的组件中:
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