搜索功能

07-01 搜索导航栏

一. 流程

'''
# 拓展:  京东 360buy -> jd

# 全文检索
    问题: 数据量的庞大
    解决: 全文检索引擎(elasticsearch 一来七课社区). java封装的一个数据库, 专注于大数据的搜索
            
# 前端: 头部搜索组件 + 搜索页面
    1. 新建页面: SearchCourse.vue
    2. 配置路由: index.js 
        path: '/course/search'
        name: 'SearchCourse'
        component: SearchCourse
    3.     拷贝搜索页面
        提示：如果search没有写返回的就是所有的内容
    4. Header.vue组件 right-part下 添加form搜索组件, 记得拿form组件的css样式, 还有搜索相关的data数据,  以及methods中的功能
    5. 修改前端路由 search_action方法中 this.$router.push中的路由跳转路径地址
    6. 难点: 查询的单词'word=值'需要返回前端, 然后通过'search=值'发送asiox
    7. 重点: 
        this.$route.query  从?号后取值
        this.$route.params 从路径中取值
        提示: wd  word 二个关键字都可以搜索 (模仿百度的这种思路www.baidu.com/?wd=shuaige)
    8. h1标签中定义总共书写到了多少门课程
    总结: 二个点
        第一点: 
            路由: path: '/course/search?word=值'
            组件: this.$route.query  从?号后取值
        第二点: .params
            路由: path: '/course/:id'
            组件: this.$route.params  从路径中取值
'''

二. 路由器/ index.js

import SearchCourse from '../views/SearchCourse.vue'

const routes = [
    // ...
    {
        path: '/course/search',
        name: 'SearchCourse',
        component: SearchCourse,
    },
];

三. 头部组件Header.vue

<form class="search">
    <div class="tips" v-if="is_search_tip">
        <span @click="search_action('Python')">Python</span>
        <span @click="search_action('Linux')">Linux</span>
    </div>
    <input type="text" :placeholder="search_placeholder" @focus="on_search" @blur="off_search" v-model="search_word">
    <button type="button" class="glyphicon glyphicon-search" @click="search_action(search_word)"></button>
</form>

<script>
    export default {
        data() {
            return {
                is_search_tip: true,
                search_placeholder: '',
                search_word: ''
            }
        },
        methods: {
            search_action(search_word) {
                if (!search_word) {
                    this.$message('请输入要搜索的内容');
                    return
                }
                if (search_word !== this.$route.query.word) {
                    this.$router.push(`/course/search?word=${search_word}`);
                }
                this.search_word = '';
            },
            on_search() {
                this.search_placeholder = '请输入想搜索的课程';
                this.is_search_tip = false;
            },
            off_search() {
                this.search_placeholder = '';
                this.is_search_tip = true;
            },
        },
    }
</script>

<style scoped>
    .search {
        float: right;
        position: relative;
        margin-top: 22px;
        margin-right: 10px;
    }

    .search input, .search button {
        border: none;
        outline: none;
        background-color: white;
    }

    .search input {
        border-bottom: 1px solid #eeeeee;
    }

    .search input:focus {
        border-bottom-color: orange;
    }

    .search input:focus + button {
        color: orange;
    }

    .search .tips {
        position: absolute;
        bottom: 3px;
        left: 0;
    }

    .search .tips span {
        border-radius: 11px;
        background-color: #eee;
        line-height: 22px;
        display: inline-block;
        padding: 0 7px;
        margin-right: 3px;
        cursor: pointer;
        color: #aaa;
        font-size: 14px;

    }

    .search .tips span:hover {
        color: orange;
    }
</style>

07-02 搜索后台接口

一. 流程

'''
# 后端    
    1. 模糊匹配: SearchFilter
    2. 自己写: 自定义过滤类, 继承filter_queryset, 指定'字段__contains', return queryset
    3. 搜索接口: 不和课程一起, 坨到一起了
        CourseSearchView 继承 G/L
        内部书写SearchFilter的即可
        提示: 需要携带分页
    4. 配置路由: search
'''

二. 路由：course / urls.py

router.register('search', views.CourseSearchView, 'search')

三. 视图：course / views.py

from rest_framework.viewsets import GenericViewSet
from rest_framework.mixins import ListModelMixin
from rest_framework.filters import SearchFilter
from . import models, serializers
from .filters import CourseFilter

# 搜索课程接口
class SearchCourseViewSet(ListModelMixin, GenericViewSet):
    queryset = Course.objects.filter(is_delete=False, is_show=True).order_by('orders')
    serializer_class = CourseModelSerializer

    # 提示: 需要携带分页
    pagination_class = PageNumberPagination

    # 自定义
    # filter_backends = [CourseFilter]

    # 使用SearchFilter
    filter_backends = [SearchFilter]
    search_fields = ['name']

07-03 搜索页面

一. 流程

'''
# 前端: 头部搜索组件 + 搜索页面
    1. 新建页面: SearchCourse.vue
    2. 配置路由: index.js 
        path: '/search'
        name: 'SearchCourse'
        component: SearchCourse
    3. 拷贝搜索页面
        提示：如果search没有写返回的就是所有的内容
    4. Header.vue组件 right-part下 添加form搜索组件, 记得拿form组件的css样式, 还有搜索相关的data数据,  以及methods中的功能
    5. 修改前端路由 search_action方法中 this.$router.push中的路由跳转路径地址
    6. 难点: 查询的单词'word=值'需要返回前端, 然后通过'search=值'发送asiox
    7. 重点: 
        this.$route.query  从?号后取值
        this.$route.params 从路径中取值
        提示: wd  word 二个关键字都可以搜索 (模仿百度的这种思路www.baidu.com/?wd=shuaige)
    8. h1标签中定义总共书写到了多少门课程
    总结: 二个点
        第一点: 
            路由: path: '/course/search?word=值'
            组件: this.$route.query  从?号后取值
        第二点: .params
            路由: path: '/course/:id'
            组件: this.$route.params  从路径中取值
'''

二. SearchCourse搜索页面

<template>
    <div class="search-course course">
        <Header/>

        <!-- 课程列表 -->
        <div class="main">
            <div v-if="course_list.length > 0" class="course-list">
                <div class="course-item" v-for="course in course_list" :key="course.name">
                    <div class="course-image">
                        <img :src="course.course_img" alt="">
                    </div>
                    <div class="course-info">
                        <h3>
                            <router-link :to="'/free/detail/'+course.id">{{course.name}}</router-link>
                            <span><img src="@/assets/img/avatar1.svg" alt="">{{course.students}}人已加入学习</span></h3>
                        <p class="teather-info">
                            {{course.teacher.name}} {{course.teacher.title}} {{course.teacher.signature}}
                            <span v-if="course.sections>course.pub_sections">共{{course.sections}}课时/已更新{{course.pub_sections}}课时</span>
                            <span v-else>共{{course.sections}}课时/更新完成</span>
                        </p>
                        <ul class="section-list">
                            <li v-for="(section, key) in course.section_list" :key="section.name"><span
                                    class="section-title">0{{key+1}}  |  {{section.name}}</span>
                                <span class="free" v-if="section.free_trail">免费</span></li>
                        </ul>
                        <div class="pay-box">
                            <div v-if="course.discount_type">
                                <span class="discount-type">{{course.discount_type}}</span>
                                <span class="discount-price">￥{{course.real_price}}元</span>
                                <span class="original-price">原价：{{course.price}}元</span>
                            </div>
                            <span v-else class="discount-price">￥{{course.price}}元</span>
                            <span class="buy-now">立即购买</span>
                        </div>
                    </div>
                </div>
            </div>
            <div v-else style="text-align: center; line-height: 60px">
                没有搜索结果
            </div>
            <div class="course_pagination block">
                <el-pagination
                        @size-change="handleSizeChange"
                        @current-change="handleCurrentChange"
                        :current-page.sync="filter.page"
                        :page-sizes="[2, 3, 5, 10]"
                        :page-size="filter.page_size"
                        layout="sizes, prev, pager, next"
                        :total="course_total">
                </el-pagination>
            </div>
        </div>
    </div>
</template>

<script>
    import Header from '../components/Header'

    export default {
        name: "SearchCourse",
        components: {
            Header,
        },
        data() {
            return {
                course_list: [],
                course_total: 0,
                filter: {
                    page_size: 10,
                    page: 1,
                    search: '',
                }
            }
        },
        created() {
            this.get_course()
        },
        watch: {
            '$route.query' () {
                this.get_course()
            }
        },
        methods: {
            handleSizeChange(val) {
                // 每页数据量发生变化时执行的方法
                this.filter.page = 1;
                this.filter.page_size = val;
            },
            handleCurrentChange(val) {
                // 页码发生变化时执行的方法
                this.filter.page = val;
            },
            get_course() {
                // 获取搜索的关键字
                this.filter.search = this.$route.query.word || this.$route.query.wd;

                // 获取课程列表信息
                this.$axios.get(`${this.$settings.base_url}/course/search/`, {
                    params: this.filter
                }).then(response => {
                    // 如果后台不分页，数据在response.data中；如果后台分页，数据在response.data.results中
                    this.course_list = response.data.results;
                    this.course_total = response.data.count;
                }).catch(() => {
                    this.$message({
                        message: "获取课程信息有误，请联系客服工作人员"
                    })
                })
            }
        }
    }
</script>

<style scoped>
    .course {
        background: #f6f6f6;
    }

    .course .main {
        width: 1100px;
        margin: 35px auto 0;
    }

    .course .condition {
        margin-bottom: 35px;
        padding: 25px 30px 25px 20px;
        background: #fff;
        border-radius: 4px;
        box-shadow: 0 2px 4px 0 #f0f0f0;
    }

    .course .cate-list {
        border-bottom: 1px solid #333;
        border-bottom-color: rgba(51, 51, 51, .05);
        padding-bottom: 18px;
        margin-bottom: 17px;
    }

    .course .cate-list::after {
        content: "";
        display: block;
        clear: both;
    }

    .course .cate-list li {
        float: left;
        font-size: 16px;
        padding: 6px 15px;
        line-height: 16px;
        margin-left: 14px;
        position: relative;
        transition: all .3s ease;
        cursor: pointer;
        color: #4a4a4a;
        border: 1px solid transparent; /* transparent 透明 */
    }

    .course .cate-list .title {
        color: #888;
        margin-left: 0;
        letter-spacing: .36px;
        padding: 0;
        line-height: 28px;
    }

    .course .cate-list .this {
        color: #ffc210;
        border: 1px solid #ffc210 !important;
        border-radius: 30px;
    }

    .course .ordering::after {
        content: "";
        display: block;
        clear: both;
    }

    .course .ordering ul {
        float: left;
    }

    .course .ordering ul::after {
        content: "";
        display: block;
        clear: both;
    }

    .course .ordering .condition-result {
        float: right;
        font-size: 14px;
        color: #9b9b9b;
        line-height: 28px;
    }

    .course .ordering ul li {
        float: left;
        padding: 6px 15px;
        line-height: 16px;
        margin-left: 14px;
        position: relative;
        transition: all .3s ease;
        cursor: pointer;
        color: #4a4a4a;
    }

    .course .ordering .title {
        font-size: 16px;
        color: #888;
        letter-spacing: .36px;
        margin-left: 0;
        padding: 0;
        line-height: 28px;
    }

    .course .ordering .this {
        color: #ffc210;
    }

    .course .ordering .price {
        position: relative;
    }

    .course .ordering .price::before,
    .course .ordering .price::after {
        cursor: pointer;
        content: "";
        display: block;
        width: 0px;
        height: 0px;
        border: 5px solid transparent;
        position: absolute;
        right: 0;
    }

    .course .ordering .price::before {
        border-bottom: 5px solid #aaa;
        margin-bottom: 2px;
        top: 2px;
    }

    .course .ordering .price::after {
        border-top: 5px solid #aaa;
        bottom: 2px;
    }

    .course .ordering .price_up::before {
        border-bottom-color: #ffc210;
    }

    .course .ordering .price_down::after {
        border-top-color: #ffc210;
    }

    .course .course-item:hover {
        box-shadow: 4px 6px 16px rgba(0, 0, 0, .5);
    }

    .course .course-item {
        width: 1100px;
        background: #fff;
        padding: 20px 30px 20px 20px;
        margin-bottom: 35px;
        border-radius: 2px;
        cursor: pointer;
        box-shadow: 2px 3px 16px rgba(0, 0, 0, .1);
        /* css3.0 过渡动画 hover 事件操作 */
        transition: all .2s ease;
    }

    .course .course-item::after {
        content: "";
        display: block;
        clear: both;
    }

    /* 顶级元素 父级元素  当前元素{} */
    .course .course-item .course-image {
        float: left;
        width: 423px;
        height: 210px;
        margin-right: 30px;
    }

    .course .course-item .course-image img {
        max-width: 100%;
        max-height: 210px;
    }

    .course .course-item .course-info {
        float: left;
        width: 596px;
    }

    .course-item .course-info h3 a {
        font-size: 26px;
        color: #333;
        font-weight: normal;
        margin-bottom: 8px;
    }

    .course-item .course-info h3 span {
        font-size: 14px;
        color: #9b9b9b;
        float: right;
        margin-top: 14px;
    }

    .course-item .course-info h3 span img {
        width: 11px;
        height: auto;
        margin-right: 7px;
    }

    .course-item .course-info .teather-info {
        font-size: 14px;
        color: #9b9b9b;
        margin-bottom: 14px;
        padding-bottom: 14px;
        border-bottom: 1px solid #333;
        border-bottom-color: rgba(51, 51, 51, .05);
    }

    .course-item .course-info .teather-info span {
        float: right;
    }

    .course-item .section-list::after {
        content: "";
        display: block;
        clear: both;
    }

    .course-item .section-list li {
        float: left;
        width: 44%;
        font-size: 14px;
        color: #666;
        padding-left: 22px;
        /* background: url("路径") 是否平铺 x轴位置 y轴位置 */
        background: url("/src/assets/img/play-icon-gray.svg") no-repeat left 4px;
        margin-bottom: 15px;
    }

    .course-item .section-list li .section-title {
        /* 以下3句，文本内容过多，会自动隐藏，并显示省略符号 */
        text-overflow: ellipsis;
        overflow: hidden;
        white-space: nowrap;
        display: inline-block;
        max-width: 200px;
    }

    .course-item .section-list li:hover {
        background-image: url("/src/assets/img/play-icon-yellow.svg");
        color: #ffc210;
    }

    .course-item .section-list li .free {
        width: 34px;
        height: 20px;
        color: #fd7b4d;
        vertical-align: super;
        margin-left: 10px;
        border: 1px solid #fd7b4d;
        border-radius: 2px;
        text-align: center;
        font-size: 13px;
        white-space: nowrap;
    }

    .course-item .section-list li:hover .free {
        color: #ffc210;
        border-color: #ffc210;
    }

    .course-item {
        position: relative;
    }

    .course-item .pay-box {
        position: absolute;
        bottom: 20px;
        width: 600px;
    }

    .course-item .pay-box::after {
        content: "";
        display: block;
        clear: both;
    }

    .course-item .pay-box .discount-type {
        padding: 6px 10px;
        font-size: 16px;
        color: #fff;
        text-align: center;
        margin-right: 8px;
        background: #fa6240;
        border: 1px solid #fa6240;
        border-radius: 10px 0 10px 0;
        float: left;
    }

    .course-item .pay-box .discount-price {
        font-size: 24px;
        color: #fa6240;
        float: left;
    }

    .course-item .pay-box .original-price {
        text-decoration: line-through;
        font-size: 14px;
        color: #9b9b9b;
        margin-left: 10px;
        float: left;
        margin-top: 10px;
    }

    .course-item .pay-box .buy-now {
        width: 120px;
        height: 38px;
        background: transparent;
        color: #fa6240;
        font-size: 16px;
        border: 1px solid #fd7b4d;
        border-radius: 3px;
        transition: all .2s ease-in-out;
        float: right;
        text-align: center;
        line-height: 38px;
        position: absolute;
        right: 0;
        bottom: 5px;
    }

    .course-item .pay-box .buy-now:hover {
        color: #fff;
        background: #ffc210;
        border: 1px solid #ffc210;
    }

    .course .course_pagination {
        margin-bottom: 60px;
        text-align: center;
    }
</style>