<template>
  <div>
    <el-form ref="loginForm" :model="form" :rules="rules" label-width="8epx" class="login-box">
        <h3 class="login-title">欢迎登录</h3>
        <el-form-item label="账号" prop="username">
        <el-input type="text" placeholder="请输入账号" v-model="form.username"/>
        </el-form-item>
        <el-form-item label="密码" prop="password">
          <el-input type="password" placeholder="请输入密码" v-model="form.password"/>
        </el-form-item>
        <el-form-item>
          <el-button type="primary" v-on:click="onSubmit('loginForm')">登录</el-button>
        </el-form-item>
    </el-form>

        <el-dialog
          title="温馨提示"
          :visible.sync="dialogVisible"
          width="30%"
          :before-close="handleClose">
          <span>请输入账号和密码</span>
          <span slot="footer" class="dialog-footer">
            <el-button type="primary" @click="dialogVisible = false">确定</el-button>
          </span>
        </el-dialog>
  </div>
</template>

<script>
  export default {
    name: "Login",
    data() {
      return {
        form: {
          username: '',
          password: ''
        },
        //表单验证，需要在el-form-item元素中增加 prop 属性
        rules: {
          username: [
            {required: true, message: '账号不可为空', trigger: 'blur'}
          ],
          password: [
            {required: true, message: '密码不可为空', trigger: 'blur'}
          ]
        },
        //对话框显示和隐藏
        dialogVisible: false
      }
    },
    methods: {
      onSubmit(formName) {
        //为表单绑定验证功能
        this.$refs[formName].validate((valid) => {
          if (valid) {
            //使用vue-router路由到指定页面，该方式称之为编程式导航
            this.$router.push("/main");
          } else {
            this.dialogVisible = true;
            return false;
          }
        });
      }
    }
  }
</script>
<style lang="scss" scoped>
  .login-box {
    border: 1px solid #DCDFE6;
    width: 350px;
    margin: 180px auto;
    padding: 35px 35px 15px 35px;
    border-radius: 5px;
    -webkit-border-radius: 5px;
    -moz-border-radius: 5px;
    box-shadow: 0 0 25px #909399;
  }

  .login-title {
  text-align: center;
  margin: 0 auto 40px auto;
    color: #303133;
  }
</style>