<template>
    <div>
        <el-menu
            class="sidebar-el-menu"
            :default-active="onRoutes"
            background-color="#324157"
            text-color="#bfcbd9"
            active-text-color="#9278FF"
            unique-opened
            mode="horizontal"
            router
            @select="handleSelect"
        >
            <template v-for="item in items">
                <template v-if="item.subs">
                    <el-submenu :index="item.index" :key="item.index">
                        <template slot="title">
                            <i :class="item.icon"></i>
                            <span slot="title">{{ item.title }}</span>
                        </template>
                        <template v-for="subItem in item.subs">
                            <el-submenu
                                v-if="subItem.subs"
                                :index="subItem.index"
                                :key="subItem.index"
                            >
                                <template slot="title">{{ subItem.title }}</template>
                                <el-menu-item
                                    v-for="(threeItem,i) in subItem.subs"
                                    :key="i"
                                    :index="threeItem.index"
                                >{{ threeItem.title }}</el-menu-item>
                            </el-submenu>
                            <el-menu-item
                                v-else
                                :index="subItem.index"
                                :key="subItem.index"
                            >{{ subItem.title }}</el-menu-item>
                        </template>
                    </el-submenu>
                </template>
                <template v-else>
                    <el-menu-item :index="item.index" :key="item.index">
                        <i :class="item.icon"></i>
                        <span slot="title">{{ item.title }}</span>
                    </el-menu-item>
                </template>
            </template>
        </el-menu>
    </div>
</template>

<script>
export default {
    data() {
        return {
            items: [
                {
                    icon: 'el-icon-lx-home',
                    index: 'dashboard',
                    title: '客户管理'
                },
                {
                    icon: 'el-icon-lx-cascades',
                    index: 'user',
                    title: '用户管理'
                },
                {
                    icon: 'el-icon-lx-copy',
                    index: 'order',
                    title: '订单管理'
                },
                {
                    icon: 'el-icon-lx-emoji',
                    index: 'configure',
                    title: '服务配置'
                },
                {
                    icon: 'el-icon-lx-emoji',
                    index: 'curriculum',
                    title: '课程管理'
                },
                {
                    icon: 'el-icon-lx-emoji',
                    index: 'data',
                    title: '数据管理'
                }
            ]
        };
    },
    watch:{
        "$route.path":function(val){
            this.items.map(e=>{
                if(val.replace('/', '')===e.index){
                    this.handleSelect(val.replace('/', ''))
                    this.$forceUpdate();
                }
            })
        }
    },
    methods:{
        handleSelect(index){
            this.onRoutes = index
            sessionStorage.setItem('sideBar',index)
        },
    },
    created() {
        if(sessionStorage.getItem('sideBar')){
            this.handleSelect(sessionStorage.getItem('sideBar'))
        }
    }
};
</script>

<style scoped>
.sidebar::-webkit-scrollbar {
    width: 0;
}
.sidebar-el-menu:not(.el-menu--collapse) {
    width: 100%;
}
.sidebar > ul {
    height: 100%;
}
</style>
