81.(前端)分配权限实现——用路由来接收参数实现展开行中选数据功能

1.概述

在上文中，我们已经实现了数据的回显，并且已经做好了后端的接口。我们本次需要实现前端的权限分配的问题——当按下弹窗中的确认按钮，传递数据给后端接口即可。

2.流程概述

针对于后端的接口是需要两个参数，一个是mid，一个是rid。需要想办法获取
对于rid，我们在showMenuDialog()函数中使用slot-scope获取当前列的id字段，作为data数据返回，再在我们使用接口函数中使用。对于mid，我们使用展开列的属性，getCheckedKeys()，getHalfCheckedKeys(),获取到半展开和全展开的id，再拼接起来转成字符串既可。
由于后端的接口用的路由接口的post请求，这里传递方式也要注意！！！

3.主要代码展示

async editMenu(){
            // console.log(this.rid)
            const mids = [
                ...this.$refs.treeRef.getHalfCheckedKeys(),
                ...this.$refs.treeRef.getCheckedKeys()
            ]
            const midsStr = mids.join(',')
            const { data: resp } = await this.$axios.post(
                `/api/set_menu/${this.rid}`,this.$qs.stringify({mids: midsStr})
            )
            if (resp.status !== 200) return this.$msg.error(resp.msg)
            this.$msg.success(resp.msg)
            this.getRoleList()
            this.dialogClose()
        }
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4.效果展示

5.完整代码展示

<template>
    <div>
        
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页el-breadcrumb-item>
            <el-breadcrumb-item>权限管理el-breadcrumb-item>
            <el-breadcrumb-item>角色列表el-breadcrumb-item>
        el-breadcrumb>
        <el-card>
            
            <el-row :gutter="20">
                <el-col :span="2">
                    <el-button type="primary" icon="el-icon-circle-plus-outline">新增角色el-button>
                el-col>
            el-row>
            
            <el-row>
                <el-col>
                    <el-table :data="roleList" border style="width:100%">
                        
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                
                                <el-row :class="['bottom', i==0?'top':'', 'rcenter']" v-for=" (m,i) in scope.row.menu" :key="m.id">
                                    <el-col :span="8">
                                        
                                        <el-tag closable @click="removeMenu(scope.row,m.id)">{{m.name}}el-tag>
                                        <span class="el-icon-caret-right">span>
                                    el-col>
                                    <el-col :span="14">
                                        <el-tag closable @click="removeMenu(scope.row,sm.id)" type="success" v-for="sm in m.children" :key="sm.id">
                                            {{sm.name}}
                                        el-tag>
                                    el-col>
                                el-row>
                            template>
                        el-table-column>
                        <el-table-column type="index">el-table-column>
                        <el-table-column prop="id" label="ID">el-table-column>
                        <el-table-column prop="name" label="角色名称">el-table-column>
                        <el-table-column prop="desc" label="角色详情">el-table-column>
                        <el-table-column prop="level" label="操作" width="300px">
                            <template slot-scope="scope">
                                <el-button size="mini" type="success" icon="el-icon-edit">修改el-button>
                                <el-button size="mini" type="danger" icon="el-icon-edit">删除el-button>
                                <el-button size="mini" type="warning" icon="el-icon-edit" @click="showMenuDialog(scope.row)">分配权限el-button>
                            template>
                        el-table-column>
                    el-table>
                el-col>
            el-row>
        el-card>
        <el-dialog title="分配权限" :visible.sync="menuDialogVisible" width="40%" :before-close="dialogClose">
            
            
            <el-tree 
            :default-checked-keys="keyList"  
            node-key = "id"
            default-expand-all
            :data="menuList" 
            :props="menuProps" 
            ref="treeRef"
            show-checkbox>el-tree>
            <span slot="footer" class="dialog-footer">
                <el-button @click="dialogClose()">取 消el-button>
                <el-button type="primary" @click="editMenu()">确 定el-button>
            span>
        el-dialog>
    div>
template>

<script>

export default {
    data () {
        return {
            roleList: [],
            menuDialogVisible:false,
            menuProps:{
                label: 'name',
                children: 'children'
            },
            menuList:[],
            keyList:[],
            rid: 0
        }
    },
    created(){
        this.getRoleList()
        // this.getMenuList()
    },
    methods: {
        async getRoleList() {
            const { data: res } = await this.$axios.get('/api/role')
            if (res.status !== 200) return this.$msg.error(res.msg)
            console.log(res.data);
            this.roleList = res.data
        },
        removeMenu(row,mid) {
            this.$confirm('此操作将永久删除该权限, 是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).then(async () => {
                const { data: resp } = await this.$axios.get(`/api/del_menu/${row.id}/${mid}`)
                if (resp.status !== 200) return this.$msg(resp.msg)
                this.$msg({
                    type: 'success',
                    message: '删除成功!'
                });
                // this.getRoleList()
                // console.log(row.id);
                // console.log(mid);
                row.menu = resp.data
            }).catch(() => {
                this.$msg({
                    type: 'info',
                    message: '已取消删除'
                });
            });
        },
        showMenuDialog(row){
            this.rid = row.id
            this.getMenuList()
            this.menuDialogVisible = true
            // 显示菜单时调用，用于数据回显
            this.getKeys(row.menu)
        },
        async getMenuList(){
            const{data :resp} = await this.$axios.get('/api/menu')
            if (resp.status !== 200) return this.$msg.error(resp.msg)
            this.menuList = resp.data
        },
        // 获取menu中的元素
        getKeys(menu) {
            menu.forEach(item => {
                item.children.forEach(i => {    
                    this.keyList.push(i.id)
                })
            })
        },
        dialogClose(){
            this.keyList = []
            this.menuDialogVisible = false
        },
        async editMenu(){
            // console.log(this.rid)
            const mids = [
                ...this.$refs.treeRef.getHalfCheckedKeys(),
                ...this.$refs.treeRef.getCheckedKeys()
            ]
            const midsStr = mids.join(',')
            const { data: resp } = await this.$axios.post(
                `/api/set_menu/${this.rid}`,this.$qs.stringify({mids: midsStr})
            )
            if (resp.status !== 200) return this.$msg.error(resp.msg)
            this.$msg.success(resp.msg)
            this.getRoleList()
            this.dialogClose()
        }
    }
   
}

script>

<style lang="less" scoped>

    .top{
        border-top: 1px solid #eee
    }
    .bottom{
        border-top: 1px solid #eee
    }
    .el-tag{
        margin: 10px;
    }
    .rcenter{
        display:flex;
        align-items: center;
    }
style>
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