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vue+element-ui实现主题切换功能

2024-04-02 19:55

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element-ui提供了自定义主题自定义主题

一、安装

npm i element-theme -g
npm i element-theme-chalk -D
npm i https://github.com/ElementUI/theme-chalk -D
官网说明安装完成后需要et -i并会有element-variables.scss文件,但是我文件中并未找到 node_modules/.bin/et,所以手动生成了

下图element-variables.scss是自己写的，因为安装完成后并未生成此文件

文件中让内容如下`

 ```
 
 $--color-primary: #d85f6a;  
 
 
 $--font-path: '~element-ui/lib/theme-chalk/fonts';
 
 @import "~element-ui/packages/theme-chalk/class="lazy" data-src/index";
 ```

页面文件：index.vue

     <el-radio-group v-model="themeRadio" @change="changeClick" size="mini">
       <el-radio label="#d85f6a">红色主题</el-radio>
          <el-radio label="#409EFF">蓝色主题</el-radio>
      </el-radio-group>
	
	文件引入：
	import ColorPicker from "@/layout/colorpicker/index";  
	使用：
    <color-picker :colorVal="colorVal"></color-picker>
	方法：
    changeClick(value){
      this.colorVal = value
      localStorage.setItem('skin',value)
      this.$store.commit("setSkin",value)
    },

colorpicker.vue文件,文件内容如下：

<template>
  <el-color-picker
    v-if="false"
    v-model="theme"
    :predefine="['#409EFF', '#1890ff', '#304156','#212121','#11a983', '#13c2c2', '#6959CD', '#f5222d', ]"
    class="theme-picker"
    popper-class="theme-picker-dropdown"
  />
</template>
<script>

const version = require('element-ui/package.json').version // element-ui version from node_modules
const ORIGINAL_THEME = '#409EFF' // default color
import { Loading } from 'element-ui';
export default {
  props:{   //在页面中将colorVal传进来
    colorVal:{
      type:String,  
    }
  },
  created(){
    // let option={
    //   background:'#FFFFFF'
    // }
      this.loadingInstance =Loading.service();  //这里增加加载loadding,因为刷新页面会出现延迟

  },
  data() {
    return {
      chalk: '', // content of theme-chalk css
      theme: '',
      loadingInstance:true
    }
  },
  computed: {
    defaultTheme() {
    // 将选择的颜色属性保存在vuex中,如果页面刷新娶不到就从ocalStorage中取
      if(this.$store.state.skin)  return this.$store.state.skin;
      else return  localStorage.getItem('skin')
      // return this.$store.state.skin
    }
  },
  watch: {
    defaultTheme:{
      handler: function(val) {
        this.$nextTick(() => {
          // this.$emit('input', this.model);
        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('#', ''))
      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
        }
      }
      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)
      $message.close()
      // this.$message({
      //     message:'皮肤切换成功',
      //     type:'success'
      // })
      this.$nextTick(() => { // 以服务的方式调用的 Loading 需要异步关闭
        // this.loadingInstance.close();
      })
      setTimeout(()=>{
        this.loadingInstance.close();

      },1000)
    }
  },
  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()
      })
    },

    //将传入的24进制颜色标号进行处理,
    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-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>

效果：

但是到现在有个问题,就是element-ui有自己的ui主题,每次radio切换主题时没问题，但是F5刷新后页面元素颜色会闪烁，顺序：element-ui颜色>当前设置缓存颜色,为了解决这个问题，就优化了代码,在APP.vue中设置，当页面刷新时能更快的渲染
1.新建colorpicker.js文件

2.APP.vue中引入

//colorpicker.js中只保留了 colorpicker.vue 中 methods：中的方法
import  colorpicker from '@/mixins/colorpicker.js'

3.使用mixins模式

mixins:[colorpicker],

在created中使用

  async created() {
      await this.getColor('#409EFF')
      await this.configRouter();
  },
  //将colorpicker.vue中此方法拿出来
  async getColor(val){
      let theme = val
      const oldVal = this.chalk ? theme : ORIGINAL_THEME
      if (typeof val !== 'string') return
      const themeCluster = this.getThemeCluster(val.replace('#', ''))
      const originalCluster = this.getThemeCluster(oldVal.replace('#', ''))
      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
        }
      }
      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()
    },

到此这篇关于vue+element-ui实现主题切换的文章就介绍到这了,更多相关vue主题切换内容请搜索编程网以前的文章或继续浏览下面的相关文章希望大家以后多多支持编程网！

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