Element UI 中登录的分析及实现

一、用户登录

  1. 登录组件的布局要点,如下所示:
  • el-form 容器,包含 usernamepassword 两个 el-form-itemel-form 主要属性,modelloginFormrulesloginRules
  • password 使用了 el-tooltip 提示,当用户打开大小写时,会进行提示,主要属性,manual 是手动控制模式,设置为 true 后, mouseentermouseleave 事件将不会生效。placement 是提示出现的位置。
  • password 对应的 el-input,主要的属性,@keyup.native 修饰符,键盘按键时绑定 checkCapslock 事件,监听键盘 enter 按下后的事件
  • 包含一个 el-button,点击时调用 handleLogin 方法,并触发 loading 效果
  1. checkCapslock 方法的主要作用,监听用户键盘输入,显示提示文字的判断逻辑是,按住 shift 时输入小写字符,未按 shift 时输入大写字符。当按下 Capslock 按键时,如果按下后是小写模式,则会立即消除提示文字,代码如下所示:
checkCapslock(e) {
     
  const {
      key } = e
  this.capsTooltip = key && key.length === 1 && (key >= 'A' && key <= 'Z')
}
  1. handleLogin 方法主要的作用是登录,流程如下所示:
  • 调用 el-formvalidate 方法对 rules 进行验证
  • 如何验证通过,则调用 vuexuser/login action 进行登录验证
  • 登录验证通过后,则会重定向到 redirect 路由,如果 redirect 路由不存在,则直接重定向到 / 路由
  • 由于 vuex 中的 user 指定了 namespacedtrue,所以 dispatch 时需要加上 namespace,否则无法调用 vuex 中的 action
  1. handleLogin,代码如下所示:
  login({
      commit }, userInfo) {
     
    const {
      username, password } = userInfo
    return new Promise((resolve, reject) => {
     
      login({
      username: username.trim(), password: password }).then(response => {
     
        const {
      data } = response
        commit('SET_TOKEN', data.token)
        setToken(data.token)
        resolve()
      }).catch(error => {
     
        reject(error)
      })
    })
 }
  1. user/login 方法,调用了 loginAPI,传入 usernamepassword 参数,请求成功后会从 response 中获取 token,然后将 token 保存到 Cookie 中,之后返回。如果请求失败,将调用 reject 方法,交由自定义的 request 模块来处理异常。

二、用户登录的完整实现

  1. login.vue,代码如下所示:
<template>
  <div class="login-container">
    <el-form ref="loginForm" :model="loginForm" :rules="loginRules" class="login-form" autocomplete="on" label-position="left">

      <div class="title-container">
        <h3 class="title">系统</h3>
      </div>

      <el-form-item prop="username">
        <span class="svg-container">
          <svg-icon icon-class="user" />
        </span>
        <el-input
          ref="username"
          v-model="loginForm.username"
          placeholder="用户名"
          name="username"
          type="text"
          tabindex="1"
          autocomplete="on"
        />
      </el-form-item>

      <el-tooltip v-model="capsTooltip" content="Caps lock is On" placement="right" manual>
        <el-form-item prop="password">
          <span class="svg-container">
            <svg-icon icon-class="password" />
          </span>
          <el-input
            :key="passwordType"
            ref="password"
            v-model="loginForm.password"
            :type="passwordType"
            placeholder="密码"
            name="password"
            tabindex="2"
            autocomplete="on"
            @keyup.native="checkCapslock"
            @blur="capsTooltip = false"
            @keyup.enter.native="handleLogin"
          />
          <span class="show-pwd" @click="showPwd">
            <svg-icon :icon-class="passwordType === 'password' ? 'eye' : 'eye-open'" />
          </span>
        </el-form-item>
      </el-tooltip>

      <el-button :loading="loading" type="primary" style="width:100%;margin-bottom:30px;" @click.native.prevent="handleLogin">登录</el-button>

    </el-form>
  </div>
</template>

<script>
import {
      validUsername } from '@/utils/validate'

export default {
     
  name: 'Login',
  components: {
      },
  data() {
     
    const validateUsername = (rule, value, callback) => {
     
      if (!validUsername(value)) {
     
        callback(new Error('请输入正确的用户名'))
      } else {
     
        callback()
      }
    }
    const validatePassword = (rule, value, callback) => {
     
      if (value.length < 6) {
     
        callback(new Error('请输入正确的密码,不能少于6位'))
      } else {
     
        callback()
      }
    }
    return {
     
      loginForm: {
     
        username: 'admin',
        password: '111111'
      },
      loginRules: {
     
        username: [{
      required: true, trigger: 'blur', validator: validateUsername }],
        password: [{
      required: true, trigger: 'blur', validator: validatePassword }]
      },
      passwordType: 'password',
      capsTooltip: false,
      loading: false,
      showDialog: false,
      redirect: undefined,
      otherQuery: {
     }
    }
  },
  watch: {
     
    $route: {
     
      handler: function(route) {
     
        const query = route.query
        if (query) {
     
          this.redirect = query.redirect
          this.otherQuery = this.getOtherQuery(query)
        }
      },
      immediate: true
    }
  },
  mounted() {
     
    if (this.loginForm.username === '') {
     
      this.$refs.username.focus()
    } else if (this.loginForm.password === '') {
     
      this.$refs.password.focus()
    }
  },
  methods: {
     
    checkCapslock(e) {
     
      const {
      key } = e
      this.capsTooltip = key && key.length === 1 && (key >= 'A' && key <= 'Z')
    },
    showPwd() {
     
      if (this.passwordType === 'password') {
     
        this.passwordType = ''
      } else {
     
        this.passwordType = 'password'
      }
      this.$nextTick(() => {
     
        this.$refs.password.focus()
      })
    },
    handleLogin() {
     
      this.$refs.loginForm.validate(valid => {
     
        if (valid) {
     
          this.loading = true
          this.$store.dispatch('user/login', this.loginForm)
            .then(() => {
     
              this.$router.push({
      path: this.redirect || '/', query: this.otherQuery })
              this.loading = false
            })
            .catch(() => {
     
              this.loading = false
            })
        } else {
     
          console.log('error submit!!')
          return false
        }
      })
    },
    getOtherQuery(query) {
     
      return Object.keys(query).reduce((acc, cur) => {
     
        if (cur !== 'redirect') {
     
          acc[cur] = query[cur]
        }
        return acc
      }, {
     })
    }
  }
}
</script>

<style lang="scss">

$bg:#283443;
$light_gray:#fff;
$cursor: #fff;

@supports (-webkit-mask: none) and (not (cater-color: $cursor)) {
     
  .login-container .el-input input {
     
    color: $cursor;
  }
}

.login-container {
     
  .el-input {
     
    display: inline-block;
    height: 47px;
    width: 85%;

    input {
     
      background: transparent;
      border: 0px;
      -webkit-appearance: none;
      border-radius: 0px;
      padding: 12px 5px 12px 15px;
      color: $light_gray;
      height: 47px;
      caret-color: $cursor;

      &:-webkit-autofill {
     
        box-shadow: 0 0 0px 1000px $bg inset !important;
        -webkit-text-fill-color: $cursor !important;
      }
    }
  }

  .el-form-item {
     
    border: 1px solid rgba(255, 255, 255, 0.1);
    background: rgba(0, 0, 0, 0.1);
    border-radius: 5px;
    color: #454545;
  }
}
</style>

<style lang="scss" scoped>
$bg:#2d3a4b;
$dark_gray:#889aa4;
$light_gray:#eee;

.login-container {
     
  min-height: 100%;
  width: 100%;
  background-color: $bg;
  overflow: hidden;

  .login-form {
     
    position: relative;
    width: 520px;
    max-width: 100%;
    padding: 160px 35px 0;
    margin: 0 auto;
    overflow: hidden;
  }

  .tips {
     
    font-size: 14px;
    color: #fff;
    margin-bottom: 10px;

    span {
     
      &:first-of-type {
     
        margin-right: 16px;
      }
    }
  }

  .svg-container {
     
    padding: 6px 5px 6px 15px;
    color: $dark_gray;
    vertical-align: middle;
    width: 30px;
    display: inline-block;
  }

  .title-container {
     
    position: relative;

    .title {
     
      font-size: 26px;
      color: $light_gray;
      margin: 0px auto 40px auto;
      text-align: center;
      font-weight: bold;
    }
  }

  .show-pwd {
     
    position: absolute;
    right: 10px;
    top: 7px;
    font-size: 16px;
    color: $dark_gray;
    cursor: pointer;
    user-select: none;
  }

  .thirdparty-button {
     
    position: absolute;
    right: 0;
    bottom: 6px;
  }

  @media only screen and (max-width: 470px) {
     
    .thirdparty-button {
     
      display: none;
    }
  }
}
</style>

  1. store 中的 user.js,代码如下所示:
import {
      login, logout, getInfo } from '@/api/user'
import {
      getToken, setToken, removeToken } from '@/utils/auth'
import router, {
      resetRouter } from '@/router'

const state = {
     
  token: getToken(),
  name: '',
  avatar: '',
  introduction: '',
  roles: []
}

const mutations = {
     
  SET_TOKEN: (state, token) => {
     
    state.token = token
  },
  SET_INTRODUCTION: (state, introduction) => {
     
    state.introduction = introduction
  },
  SET_NAME: (state, name) => {
     
    state.name = name
  },
  SET_AVATAR: (state, avatar) => {
     
    state.avatar = avatar
  },
  SET_ROLES: (state, roles) => {
     
    state.roles = roles
  }
}

const actions = {
     
  login({
      commit }, userInfo) {
     
    const {
      username, password } = userInfo
    return new Promise((resolve, reject) => {
     
      login({
      username: username.trim(), password: password }).then(response => {
     
        const {
      data } = response
        commit('SET_TOKEN', data.token)
        setToken(data.token)
        resolve()
      }).catch(error => {
     
        reject(error)
      })
    })
  },

  getInfo({
      commit, state }) {
     
    return new Promise((resolve, reject) => {
     
      getInfo(state.token).then(response => {
     
        const {
      data } = response

        if (!data) {
     
          reject('Verification failed, please Login again.')
        }

        const {
      roles, name, avatar, introduction } = data

        if (!roles || roles.length <= 0) {
     
          reject('getInfo: roles must be a non-null array!')
        }

        commit('SET_ROLES', roles)
        commit('SET_NAME', name)
        commit('SET_AVATAR', avatar)
        commit('SET_INTRODUCTION', introduction)
        resolve(data)
      }).catch(error => {
     
        reject(error)
      })
    })
  },

  logout({
      commit, state, dispatch }) {
     
    return new Promise((resolve, reject) => {
     
      logout(state.token).then(() => {
     
        commit('SET_TOKEN', '')
        commit('SET_ROLES', [])
        removeToken()
        resetRouter()

        dispatch('tagsView/delAllViews', null, {
      root: true })

        resolve()
      }).catch(error => {
     
        reject(error)
      })
    })
  },

  resetToken({
      commit }) {
     
    return new Promise(resolve => {
     
      commit('SET_TOKEN', '')
      commit('SET_ROLES', [])
      removeToken()
      resolve()
    })
  },

  async changeRoles({
      commit, dispatch }, role) {
     
    const token = role + '-token'

    commit('SET_TOKEN', token)
    setToken(token)

    const {
      roles } = await dispatch('getInfo')

    resetRouter()

    const accessRoutes = await dispatch('permission/generateRoutes', roles, {
      root: true })
    router.addRoutes(accessRoutes)

    dispatch('tagsView/delAllViews', null, {
      root: true })
  }
}

export default {
     
  namespaced: true,
  state,
  mutations,
  actions
}

  1. api 下的 user.js,代码如下所示:
import request from '@/utils/request'

export function login(data) {
     
  return request({
     
    url: '/vue-element-admin/user/login',
    method: 'post',
    data
  })
}

export function getInfo(token) {
     
  return request({
     
    url: '/vue-element-admin/user/info',
    method: 'get',
    params: {
      token }
  })
}

export function logout() {
     
  return request({
     
    url: '/vue-element-admin/user/logout',
    method: 'post'
  })
}

  1. utils 下的 request.js,代码如下所示:
import axios from 'axios'
import {
      MessageBox, Message } from 'element-ui'
import store from '@/store'
import {
      getToken } from '@/utils/auth'

const service = axios.create({
     
  baseURL: process.env.VUE_APP_BASE_API, 
  timeout: 5000 
})

service.interceptors.request.use(
  config => {
     

    if (store.getters.token) {
     
      config.headers['X-Token'] = getToken()
    }
    return config
  },
  error => {
     
    console.log(error) 
    return Promise.reject(error)
  }
)

service.interceptors.response.use(
  response => {
     
    const res = response.data

    if (res.code !== 20000) {
     
      Message({
     
        message: res.message || 'Error',
        type: 'error',
        duration: 5 * 1000
      })

      if (res.code === 50008 || res.code === 50012 || res.code === 50014) {
     
        MessageBox.confirm('You have been logged out, you can cancel to stay on this page, or log in again', 'Confirm logout', {
     
          confirmButtonText: 'Re-Login',
          cancelButtonText: 'Cancel',
          type: 'warning'
        }).then(() => {
     
          store.dispatch('user/resetToken').then(() => {
     
            location.reload()
          })
        })
      }
      return Promise.reject(new Error(res.message || 'Error'))
    } else {
     
      return res
    }
  },
  error => {
     
    console.log('err' + error) 
    Message({
     
      message: error.message,
      type: 'error',
      duration: 5 * 1000
    })
    return Promise.reject(error)
  }
)

export default service

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