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Vue + element-ui 背景图片设置方式

Vue element-ui 背景图片设置 element-ui设置背景图片 2022-11-13 13:11:07 714人浏览八月长安

摘要

目录element-ui 背景图片设置element自定义背景更换element-ui 背景图片设置初学vue 看到其他网址都有些背景图片，于是试着自己也写了一下，表述不好请见谅

element-ui 背景图片设置

初学vue 看到其他网址都有些背景图片，于是试着自己也写了一下，表述不好请见谅

实现效果

背景图片设置

实现效果

以下是如何实现：

找到你想要设置背景图片的页面

data里设置url

data() {
      return {
        url: '',
        urlList: [],
        timer: null
      }
    },

设置背景图片绑定url，并填满页面

<div class="pull-height animated" :class="{'zoomOutUp': isLock}" :style="{backgroundImage:'url('+url+')'}" style="background-size: 100% 100%">
</div>

将子组件用div包裹，设置子组件透明度

<div class="index">
</div>

.index {
    filter:alpha(Opacity=85);
    -moz-opacity:0.85;
    opacity: 0.85;
    }

这样背景图片就设置好了，只要将url替换成图片连接即可

接下来用element-ui的upload组件来设置url

在父组件设置监听事件，监听子组件传值，也可以用Vuex实现

 <top v-on:listenToChildEvent="setBackground"></top>

子组件设置数据

 data() {
      return {
        uploadFile: {
          dialogVisible: false,
          uploadImageList: [],
          uploadMedia: []
        },
        dialogFORMVisible: false
      }
    },

点击弹出图片上传界面

<el-tooltip class='item' effect='dark' content='背景图片设置' placement='bottom'>
      <div style="font-size: 14px;margin-right: 20px" @click='dialogFormVisible = true'>
        背景设置
      </div>
      </el-tooltip>

绑定数据

<el-dialog v-dialogDrag :visible.sync="dialogFormVisible" width="40%" title="背景图片设置">
      <div style="text-align: center;margin-bottom: 10px">
        <span>多张图片隔10分钟切换</span>
      </div>
      <el-upload style="text-align: center" action="你的上传图片接口" list-type="picture-card" ref="uploadImages" :multiple="true" :limit="4"
                 :file-list="uploadFile.uploadImageList" :autoUpload="true" :on-remove="handleUploadRemove" :onPreview="handlePictureCardPreview"
                 :onSuccess="handleUploadSuccess" :onExceed="()=>{$message.error('背景图片不能超过四张')}">
        <i class="el-icon-plus"></i>
      </el-upload>
      <div style="text-align: center;margin-top: 10px">
        <el-button type="primary" @click='saveImage'>保存</el-button>
      </div>
    </el-dialog>

handleUploadSuccess(response, file, fileList) { // 上传图片成功后的回调
        this.uploadFile.uploadImageList = fileList
        this.$message.success('上传成功')
        console.log('上传图片回调')
      },
      handleMidiaUploadSuccess(response, file, fileList) { // 上传媒体成功后的回调
        this.uploadFile.uploadMedia = fileList
      },
      handleUploadRemove(file, fileList) { // 删除图片callback
        this.uploadFile.uploadImageList = fileList
      },
      handleMediaRemove(response, file, fileList) {
        this.uploadFile.uploadMedia = fileList
      },
      handlePictureCardPreview(file) { // 预览图片
        this.uploadFile.dialogImageUrl = file.url
        this.uploadFile.dialogVisible = true
      },

点击保存按钮后触发的事件，这时父组件能接收到uploadImageList

saveImage() {
        this.$emit('listenToChildEvent', this.uploadFile.uploadImageList)
        this.dialogFormVisible = false
      },

父组件修改背景图片的值，并将图片连接存入localStorage，这样页面刷新图片不会丢失

setData() {
        console.log(this.urlList.length)
        var imageMax = this.urlList.length - 1
        var imageMin = 0
        var imageNumber = parseInt(Math.random() * (imageMax - imageMin + 1) + imageMin)
        this.url = this.urlList[imageNumber]
        console.log(imageNumber)
        console.log(this.url)
      },
setBackground(data) {
        console.log(data)
        if (data.length === 0) {
          this.url = ''
          this.urlList = []
          localStorage.setItem('mydata', JSON.stringify(this.urlList))
        } else {
          this.url = ''
          this.urlList = []
          for (let i = 0; i < data.length; i++) {
            this.urlList.push(
              data[i].response.data
            )
          }
          this.setData()
          localStorage.setItem('mydata', jsON.stringify(this.urlList))
        }
      }

页面初始化的时候从localStorage取数据

创建线程每隔10分钟更换背景图片

mounted() {
      this.timer = setInterval(this.setData, 600000)
      var imgList = JSON.parse(localStorage.mydata)
      this.urlList = imgList
      this.setData()
    },

页面被销毁时触发事件，清空定时器

beforeDestroy() {
      clearInterval(this.timer)
      this.timer = null
    },

这样写完，图片改变时页面会闪烁

在设置背景图片的div上，加上v-cloak 防止页面闪烁

<div v-cloak class="pull-height animated" :class="{'zoomOutUp': isLock}" :style="{backgroundImage:'url('+url+')'}" style="background-size: 100% 100%">
</div>

在style里配置

[v-cloak] {
    display: none;
  }

element自定义背景更换

最近的项目中需要自定义背景更换。可以在element官网查看使用方法，有2中方法，使用了第一种比较简单的，第二种自己尝试了开头没有继续。

在这里使用这个方法，在项目中新建一个js文件，并且全局引用

在这个element-variables.sCSS里面内容可以官网复制过来


$--color-primary: #1890ff;
$--color-success: #13ce66;
$--color-warning: #ffba00;
$--color-danger: #ff4949;
$--color-info: rgba(32, 37, 57, 1);
$--button-font-weight: 400;
// $--color-text-regular: #1f2d3D;
$--border-color-light: #dfe4ed;
$--border-color-lighter: #e6ebf5;
$--table-border:1px solid#dfe6ec;

$--font-path: '~element-ui/lib/theme-chalk/fonts';
@import "~element-ui/packages/theme-chalk/src/index";
// the :export directive is the magic sauce for webpack
// https://www.bluematador.com/blog/how-to-share-variables-between-js-and-sass
:export {
  theme: $--color-primary;
}

我们使用store来实现主题更换

引入index.js里面

此后进行组件编写在components

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

<script> 
export default {
  data () {
    return {};
  },
  props: ['theme'],
  computed: {
    defaultColor: {
      get () {
        return this.theme
      },
      set (val) {
        this.$emit('change', val)
      }
    }
  },
  methods: {}
};
</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>

以上这里方法是自己写的，如果是简单的背景更换，可以使用这个一版本方法，可以看懂的自己研究一下里面方法，例如：

<template>
  <el-color-picker
    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
// 默认颜色
const ORIGINAL_THEME = '#409EFF' // default color
export default {
  data() {
    return {
      chalk: '', // content of theme-chalk css
      theme: ''
    }
  },
  computed: {
    defaultTheme() {
      return this.$store.state.settings.theme
    }
  },
  watch: {
    defaultTheme: {
      handler: function(val, oldVal) {
        this.theme = val
      },
      immediate: true
    },
    async theme(val) {
      await this.setTheme(val)
    }
  },
  created() {
    if(this.defaultTheme !== ORIGINAL_THEME) {
      this.setTheme(this.defaultTheme)
    }
  },
  methods: {
    async setTheme(val) {
      const oldVal = this.chalk ? this.theme : ORIGINAL_THEME
      if (typeof val !== 'string') return
      const themeCluster = this.getThemeCluster(val.replace('#', ''))
      const originalCluster = this.getThemeCluster(oldVal.replace('#', ''))
      const getHandler = (variable, id) => {
        return () => {
          const originalCluster = this.getThemeCluster(ORIGINAL_THEME.replace('#', ''))
          const newStyle = this.updateStyle(this[variable], originalCluster, themeCluster)
          let styleTag = document.getElementById(id)
          if (!styleTag) {
            styleTag = document.createElement('style')
            styleTag.setAttribute('id', id)
            document.head.appendChild(styleTag)
          }
          styleTag.innerText = newStyle
        }
      }
      if (!this.chalk) {
        const url = `Https://unpkg.com/element-ui@${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.$emit('change', val)
    },
    updateStyle(style, oldCluster, newCluster) {
      let newStyle = style
      oldCluster.forEach((color, index) => {
        newStyle = newStyle.replace(new RegExp(color, 'ig'), newCluster[index])
      })
      return newStyle
    },
    getCSSString(url, variable) {
      return new Promise(resolve => {
        const xhr = new XMLHttpRequest()
        xhr.onreadystatechange = () => {
          if (xhr.readyState === 4 && xhr.status === 200) {
            this[variable] = xhr.responseText.replace(/@font-face{[^}]+}/, '')
            resolve()
          }
        }
        xhr.open('GET', url)
        xhr.send()
      })
    },
    getThemeCluster(theme) {
      const tintColor = (color, tint) => {
        let red = parseInt(color.slice(0, 2), 16)
        let green = parseInt(color.slice(2, 4), 16)
        let blue = parseInt(color.slice(4, 6), 16)
        if (tint === 0) { // when primary color is in its rgb space
          return [red, green, blue].join(',')
        } else {
          red += Math.round(tint * (255 - red))
          green += Math.round(tint * (255 - green))
          blue += Math.round(tint * (255 - blue))
          red = red.toString(16)
          green = green.toString(16)
          blue = blue.toString(16)
          return `#${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-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>

背景和字体颜色如果是同一个颜色，会有冲突，所以字体颜色需要单独设置