前言

若依分离版的通知公告没有预览功能，想开发通知公告功能

开发通知公告

1. 效果如下
   
   
2. 具体开发内容

修改若依notice代码如下。

<template>
  <div class="app-container">
    <el-form :model="queryParams" ref="queryForm" size="small" :inline="true" v-show="showSearch" label-width="68px">
      <el-form-item label="公告标题" prop="noticeTitle">
        <el-input
          v-model="queryParams.noticeTitle"
          placeholder="请输入公告标题"
          clearable
          @keyup.enter.native="handleQuery"
        />
      </el-form-item>
      <el-form-item label="操作人员" prop="createBy">
        <el-input
          v-model="queryParams.createBy"
          placeholder="请输入操作人员"
          clearable
          @keyup.enter.native="handleQuery"
        />
      </el-form-item>
      <el-form-item label="类型" prop="noticeType">
        <el-select v-model="queryParams.noticeType" placeholder="公告类型" clearable>
          <el-option
            v-for="dict in dict.type.sys_notice_type"
            :key="dict.value"
            :label="dict.label"
            :value="dict.value"
          />
        </el-select>
      </el-form-item>
      <el-form-item>
        <el-button type="primary" icon="el-icon-search" size="mini" @click="handleQuery">搜索</el-button>
        <el-button icon="el-icon-refresh" size="mini" @click="resetQuery">重置</el-button>
      </el-form-item>
    </el-form>

    <el-row :gutter="10" class="mb8">
      <el-col :span="1.5">
        <el-button
          type="primary"
          plain
          icon="el-icon-plus"
          size="mini"
          @click="handleAdd"
          v-hasPermi="['system:notice:add']"
        >新增</el-button>
      </el-col>
      <el-col :span="1.5">
        <el-button
          type="success"
          plain
          icon="el-icon-edit"
          size="mini"
          :disabled="single"
          @click="handleUpdate"
          v-hasPermi="['system:notice:edit']"
        >修改</el-button>
      </el-col>
      <el-col :span="1.5">
        <el-button
          type="danger"
          plain
          icon="el-icon-delete"
          size="mini"
          :disabled="multiple"
          @click="handleDelete"
          v-hasPermi="['system:notice:remove']"
        >删除</el-button>
      </el-col>
      <right-toolbar :showSearch.sync="showSearch" @queryTable="getList"></right-toolbar>
    </el-row>

    <el-table v-loading="loading" :data="noticeList" @selection-change="handleSelectionChange">
      <el-table-column type="selection" width="55" align="center" />
      <el-table-column label="序号" align="center" prop="noticeId" width="100" />
      <el-table-column
        label="公告标题"
        align="center"
        prop="noticeTitle"
        :show-overflow-tooltip="true"
      />
      <el-table-column label="公告类型" align="center" prop="noticeType" width="100">
        <template slot-scope="scope">
          <dict-tag :options="dict.type.sys_notice_type" :value="scope.row.noticeType"/>
        </template>
      </el-table-column>
      <el-table-column label="状态" align="center" prop="status" width="100">
        <template slot-scope="scope">
          <dict-tag :options="dict.type.sys_notice_status" :value="scope.row.status"/>
        </template>
      </el-table-column>
      <el-table-column label="创建者" align="center" prop="createBy" width="100" />
      <el-table-column label="创建时间" align="center" prop="createTime" width="100">
        <template slot-scope="scope">
          <span>{{ parseTime(scope.row.createTime, '{y}-{m}-{d}') }}</span>
        </template>
      </el-table-column>
      <el-table-column label="操作" align="center" class-name="small-padding fixed-width">
        <template slot-scope="scope">
          <el-button
            size="mini"
            type="text"
            icon="el-icon-edit"
            @click="handleUpdate(scope.row)"
            v-hasPermi="['system:notice:edit']"
          >修改</el-button>
          <el-button
            size="mini"
            type="text"
            icon="el-icon-delete"
            @click="handleDelete(scope.row)"
            v-hasPermi="['system:notice:remove']"
          >删除</el-button>
          <el-button
            size="mini"
            type="text"
            icon="el-icon-view"
            @click="openDetailDialog(scope.row.noticeId)"
          >查看</el-button>
        </template>
      </el-table-column>
    </el-table>

    <pagination
      v-show="total>0"
      :total="total"
      :page.sync="queryParams.pageNum"
      :limit.sync="queryParams.pageSize"
      @pagination="getList"
    />

    <!-- 添加或修改公告对话框 -->
    <el-dialog :title="title" :visible.sync="open" width="780px" append-to-body>
      <el-form ref="form" :model="form" :rules="rules" label-width="80px">
        <el-row>
          <el-col :span="12">
            <el-form-item label="公告标题" prop="noticeTitle">
              <el-input v-model="form.noticeTitle" placeholder="请输入公告标题" />
            </el-form-item>
          </el-col>
          <el-col :span="12">
            <el-form-item label="公告类型" prop="noticeType">
              <el-select v-model="form.noticeType" placeholder="请选择公告类型">
                <el-option
                  v-for="dict in dict.type.sys_notice_type"
                  :key="dict.value"
                  :label="dict.label"
                  :value="dict.value"
                ></el-option>
              </el-select>
            </el-form-item>
          </el-col>
          <el-col :span="24">
            <el-form-item label="状态">
              <el-radio-group v-model="form.status">
                <el-radio
                  v-for="dict in dict.type.sys_notice_status"
                  :key="dict.value"
                  :label="dict.value"
                >{{dict.label}}</el-radio>
              </el-radio-group>
            </el-form-item>
          </el-col>
          <el-col :span="24">
            <el-form-item label="内容">
              <editor v-model="form.noticeContent" :min-height="192"/>
            </el-form-item>
          </el-col>
        </el-row>
      </el-form>
      <div slot="footer" class="dialog-footer">
        <el-button type="primary" @click="submitForm">确 定</el-button>
        <el-button @click="cancel">取 消</el-button>
      </div>
    </el-dialog>


    <!--通知公告详情 -->
    <el-dialog :title="form.noticeTitle"
               :visible.sync="openDetail"
               width="800px" append-to-body
               :fullscreen="dialogFull"
               custom-class="adTextDetailDialogClass"
    >
      <div slot="title">
        <div class="avue-crud__dialog__header">
            <span class="el-dialog__title">
            <span style="display:inline-block;background-color: #3478f5;
            width:3px;height:20px;margin-right:5px;
            float: left;margin-top:2px"></span>
              {{ form.noticeTitle }}
            </span>
          <!--     全屏缩放按钮     -->
          <div class="avue-crud__dialog__menu" @click="dialogFull? dialogFull=false: dialogFull=true">
            <i class="el-icon-full-screen"></i>
          </div>
        </div>
      </div>

      <div style="margin-top:-20px;margin-bottom:10px;">
        <el-tag size="mini" effect="dark" type="warning" v-if="form.noticeType==2">公告</el-tag>
        <el-tag size="mini" effect="dark" v-else>信息</el-tag>
        <span style="margin-left:20px;">{{form.createTime}}</span>
      </div>
      <div v-loading="loadingDetail" class="content">
        <div v-html="form.noticeContent" style="margin-left:0px;margin-right:76px" class="ql-editor"></div>
      </div>
      <div slot="footer" class="dialog-footer">
        <el-button type="primary" @click="closeDetail"> 关 闭 </el-button>
      </div>

    </el-dialog>

  </div>
</template>

<script>
import { listNotice, getNotice, delNotice, addNotice, updateNotice } from "@/api/system/notice";
import ZDialog from '@/components/ZDialog'
import ZDialog2 from '@/components/ZDialog2'
export default {
  name: "Notice",
  dicts: ['sys_notice_status', 'sys_notice_type'],
  components: {
    ZDialog,
    ZDialog2
  },
  data() {
    return {
      // 全屏缩放按钮
      dialogFull:false,
      // 详情加载
      loadingDetail: false,
      // 打开详情
      openDetail: false,

      // 遮罩层
      loading: true,
      // 选中数组
      ids: [],
      // 非单个禁用
      single: true,
      // 非多个禁用
      multiple: true,
      // 显示搜索条件
      showSearch: true,
      // 总条数
      total: 0,
      // 公告表格数据
      noticeList: [],
      // 弹出层标题
      title: "",
      // 是否显示弹出层
      open: false,
      // 查询参数
      queryParams: {
        pageNum: 1,
        pageSize: 10,
        noticeTitle: undefined,
        createBy: undefined,
        status: undefined
      },
      // 表单参数
      form: {},
      // 表单校验
      rules: {
        noticeTitle: [
          { required: true, message: "公告标题不能为空", trigger: "blur" }
        ],
        noticeType: [
          { required: true, message: "公告类型不能为空", trigger: "change" }
        ]
      }
    };
  },
  created() {
    this.getList();
  },
  methods: {
    /** 查询公告列表 */
    getList() {
      this.loading = true;
      listNotice(this.queryParams).then(response => {
        this.noticeList = response.rows;
        this.total = response.total;
        this.loading = false;
      });
    },
    // 取消按钮
    cancel() {
      this.open = false;
      this.reset();
    },
    // 表单重置
    reset() {
      this.form = {
        noticeId: undefined,
        noticeTitle: undefined,
        noticeType: undefined,
        noticeContent: undefined,
        status: "0"
      };
      this.resetForm("form");
    },
    /** 搜索按钮操作 */
    handleQuery() {
      this.queryParams.pageNum = 1;
      this.getList();
    },
    /** 重置按钮操作 */
    resetQuery() {
      this.resetForm("queryForm");
      this.handleQuery();
    },
    // 多选框选中数据
    handleSelectionChange(selection) {
      this.ids = selection.map(item => item.noticeId)
      this.single = selection.length!=1
      this.multiple = !selection.length
    },
    /** 新增按钮操作 */
    handleAdd() {
      this.reset();
      this.open = true;
      this.title = "添加公告";
    },
    /** 修改按钮操作 */
    handleUpdate(row) {
      this.reset();
      const noticeId = row.noticeId || this.ids
      getNotice(noticeId).then(response => {
        this.form = response.data;
        this.open = true;
        this.title = "修改公告";
      });
    },
    // 打开信息详情
    openDetailDialog(id) {
      this.dialogVisible2 = true;
      this.openDetail = true;
      this.loadingDetail = true;
      getNotice(id).then(response => {
        this.form = response.data;
        this.openDetail = true;
        this.loadingDetail = false;
      });
    },
    // 取消按钮
    closeDetail() {
      this.titleDetail = "详情";
      this.openDetail = false;
      this.reset();
    },
    /** 提交按钮 */
    submitForm: function() {
      this.$refs["form"].validate(valid => {
        if (valid) {
          if (this.form.noticeId != undefined) {
            updateNotice(this.form).then(response => {
              this.$modal.msgSuccess("修改成功");
              this.open = false;
              this.getList();
            });
          } else {
            addNotice(this.form).then(response => {
              this.$modal.msgSuccess("新增成功");
              this.open = false;
              this.getList();
            });
          }
        }
      });
    },
    /** 删除按钮操作 */
    handleDelete(row) {
      const noticeIds = row.noticeId || this.ids
      this.$modal.confirm('是否确认删除公告编号为"' + noticeIds + '"的数据项？').then(function() {
        return delNotice(noticeIds);
      }).then(() => {
        this.getList();
        this.$modal.msgSuccess("删除成功");
      }).catch(() => {});
    }
  }
};
</script>

<style lang="scss" scoped>
/*  dialog*/
::v-deep .el-dialog {
  margin-top: 0vh !important;
}
::v-deep .el-dialog__header {
  padding: 15px 20px 15px;
}
::v-deep .el-dialog__headerbtn{
  top: 15px;
}

/*dialog header*/
::v-deep .el-dialog__header{
  background: #e3eaed;
}
::v-deep .avue-crud__dialog__header {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: center;
  -ms-flex-align: center;
  align-items: center;
  -webkit-box-pack: justify;
  -ms-flex-pack: justify;
  justify-content: space-between;
}
::v-deep .el-dialog__title {
  color: rgba(0,0,0,.85);
  font-weight: 500;
  word-wrap: break-word;
}
/*全屏缩放图标样式*/
::v-deep .avue-crud__dialog__menu {
  padding-right: 20px;
  float: left;
}
::v-deep .avue-crud__dialog__menu i {
  color: #909399;
  font-size: 15px;
}
::v-deep .el-icon-full-screen{
  cursor: pointer;
}
::v-deep .el-icon-full-screen:before {
  content: "\e719";
}

//头部固定
::v-deep .adTextDetailDialogClass .el-dialog__body{
  max-height: calc(100vh - 150px);
  overflow: auto;
  border-top:1px solid #dfdfdf;
  border-bottom:1px solid #dfdfdf;
}
::v-deep .adTextDetailDialogClass .el-dialog{
  position: fixed;
  height:fit-content;
  left:0 !important;
  right:0 !important;
  top:0 !important;
  bottom:0 !important;
  margin:auto !important;
}

</style>

参考文章
【1】若依分离版—增加通知公告预览功能