Flask 小程序菜品搜索-编程知识

mina/pages/food/index.wxml

<!--index.wxml-->
<!--1px = 750/320 = 2.34rpx;-->
<view class="container"><!--轮播图--><view class="swiper-container"><swiper class="swiper_box" autoplay="{{autoplay}}" interval="{{interval}}" duration="{{duration}}" bindchange="swiperchange"><block wx:for="{{banners}}" wx:key="id"><swiper-item><image bindtap="tapBanner" data-id="{{item.id}}" src="{{item.pic_url}}" class="slide-image" width="750rpx" height="562.5rpx" /></swiper-item></block></swiper><view class="dots"><block wx:for="{{banners}}" wx:key="unique"><view class="dot{{index == swiperCurrent ? ' active' : ''}}"></view></block></view></view><!--分类展示--><view class="type-container"><scroll-view class="type-navbar" scroll-x="true"><view class="type-box" wx:for-items="{{categories}}" wx:key="id"><view id="{{item.id}}" class="type-navbar-item {{activeCategoryId == item.id ? 'type-item-on' : ''}}" bindtap="catClick">{{item.name}}</view></view></scroll-view></view><!--搜索框--><view class="search-view" style="background:{{ scrollTop === 0 ?'-webkit-linear-gradient(top, rgba(105,195,170, 1), rgba(105,195,170, 0.3))' :( scrollTop<200 ? 'rgba(105,195,170,'+(scrollTop/400+0.3) +')' : 'rgba(105,195,170,1)')  }} "><view class="search-content"><image src="/images/search-pic.png" class="search-icon" /><input placeholder="请输入搜索内容" class="search-input" maxlength="30" confirm-type="搜索" bindinput='listenerSearchInput'></input><button class='search-btn' bindtap="toSearch">搜索</button></view></view><view class="goods-container"><view class="goods-box" wx:for-items="{{goods}}"  bindtap="toDetailsTap" data-id="{{item.id}}"><view class="img-box"><image src="{{item.pic_url}}" class="image" mode="aspectFill" lazy-load="true" /></view><view class="goods-title">{{item.name}}</view><view style='display:flex;'><view class="goods-price">¥ {{item.min_price}}</view><view wx:if="{{item.price && item.price > 0 && item.min_price != item.price}}" class="goods-price" style='color:#aaa;text-decoration:line-through'>¥ {{item.price}}</view></view></view></view><view hidden="{{loadingMoreHidden ? true : false}}" class="no-more-goods">哥也是有底线的</view>
</view>

分类展示

用于展示一个包含滚动视图和下拉菜单的页面

scroll-view | 微信开放文档

该段代码是一个简单的小程序页面，包含了一个横向滚动的导航栏和对应的内容展示区域。下面是各部分功能的简单赘述：

<view class="type-container">：定义一个视图容器，用于包裹整个页面的内容。
<scroll-view class="type-navbar" scroll-x="true">：定义一个横向滚动的视图容器，用于展示导航栏。
<view class="type-box" wx:for-items="{{categories}}" wx:key="id">：定义一个视图容器，用于包裹导航栏的每个选项。
<view id="{{item.id}}" class="type-navbar-item {{activeCategoryId == item.id ? 'type-item-on' : ''}}" >：定义一个视图容器，表示导航栏的每个选项。根据activeCategoryId的值来判断当前选项是否被选中，如果选中则添加type-item-on样式。bindtap属性绑定了一个点击事件。
{{item.name}}：展示导航栏选项的名称，使用双花括号{{}}来插入动态数据,在导航栏选项中显示当前元素的名称。

总体来说，该段代码实现了一个横向滚动的导航栏，点击不同的选项可以切换对应的内容展示区域。

事件 | 微信开放文档如bindtap，当用户点击该组件的时候会在该页面对应的Page中找到相应的事件处理函数。

mina/pages/food/food.js

实现网络相关请求的加载

//index.js
//获取应用实例
var app = getApp();
Page({data: {indicatorDots: true,autoplay: true,interval: 3000,duration: 1000,loadingHidden: false, // loadingswiperCurrent: 0,categories: [],activeCategoryId: 0,goods: [],scrollTop: "0",loadingMoreHidden: true,searchInput: '',p:1,processing:false},onLoad: function () {var that = this;wx.setNavigationBarTitle({title: app.globalData.shopName});},//解决切换不刷新维内托，每次展示都会调用这个方法onShow:function(){this.getBannerAndCat();},scroll: function (e) {var that = this, scrollTop = that.data.scrollTop;that.setData({scrollTop: e.detail.scrollTop});},//事件处理函数swiperchange: function (e) {this.setData({swiperCurrent: e.detail.current})},listenerSearchInput:function( e ){this.setData({searchInput: e.detail.value});},toSearch:function( e ){this.setData({p:1,goods:[],loadingMoreHidden:true});this.getFoodList();},tapBanner: function (e) {if (e.currentTarget.dataset.id != 0) {wx.navigateTo({url: "/pages/food/info?id=" + e.currentTarget.dataset.id});}},toDetailsTap: function (e) {wx.navigateTo({url: "/pages/food/info?id=" + e.currentTarget.dataset.id});},getBannerAndCat: function () {var that = this;wx.request({url: app.buildUrl("/food/index"),header: app.getRequestHeader(),success: function (res) {var resp = res.data;if (resp.code != 200) {app.alert({"content": resp.msg});return;}that.setData({banners: resp.data.banner_list,categories: resp.data.cat_list});that.getFoodList();}});},catClick: function (e) {this.setData({activeCategoryId: e.currentTarget.id});this.setData({loadingMoreHidden: true,p:1,goods:[]});this.getFoodList();},onReachBottom: function () {var that = this;setTimeout(function () {that.getFoodList();}, 500);},getFoodList: function () {var that = this;if( that.data.processing ){return;}if( !that.data.loadingMoreHidden ){return;}that.setData({processing:true});wx.request({url: app.buildUrl("/food/search"),header: app.getRequestHeader(),data: {cat_id: that.data.activeCategoryId,mix_kw: that.data.searchInput,p: that.data.p,},success: function (res) {var resp = res.data;if (resp.code != 200) {app.alert({"content": resp.msg});return;}var goods = resp.data.list;that.setData({goods: that.data.goods.concat( goods ),p: that.data.p + 1,processing:false});if( resp.data.has_more == 0 ){that.setData({loadingMoreHidden: false});}}});}
});

getBannerAndCat:function(){ }

banner 美/ˈbænər/ adj.极好的，出色的

RequestTask | 微信开放文档发起 HTTPS 网络请求。

wx.request是微信小程序中用于发起网络请求的API。它可以向服务器发送HTTP请求，并在请求成功或失败时执行相应的回调函数。

以下是一个使用wx.request发起GET请求的示例：

wx.request({url: 'https://api.example.com/data',method: 'GET',success: function(res) {console.log(res.data); // 请求成功时的处理逻辑},fail: function(err) {console.error(err); // 请求失败时的处理逻辑},complete: function() {console.log('请求完成'); // 无论请求成功或失败都会执行的回调函数}
});

在上述示例中，我们通过传入一个对象作为参数来调用wx.request函数。该对象包含了请求的URL、请求方法、成功、失败和完成时的回调函数。

成功时的回调函数会接收一个参数res，其中包含了py服务器返回的数据。我们可以通过res.data来获取返回的数据。

失败时的回调函数会接收一个参数err，其中包含了请求失败的错误信息。

完成时的回调函数不论请求成功或失败都会执行。

需要注意的是，wx.request只能在小程序的前端代码中使用，不能在小程序的云函数中使用。

知识点1：setData（{}）

setData是小程序中用于更新页面数据的方法。它可以修改this.data中的数据，并将修改后的数据同步到页面上，从而实现页面的更新。

以下是使用setData方法的示例：

// 修改this.data中的数据
this.setData({text: 'changed data'
});// 修改对象或数组字段中的子字段
this.setData({'array[0].text': 'changed data'
});// 修改对象的某个属性
this.setData({'object.text': 'changed data'
});

需要注意的是，直接修改this.data而不调用setData是无法改变页面的状态的，还会造成数据不一致。因此，在小程序中应该始终使用setData来更新页面数据。

getFoodList:function(){ }

cat_id 当前选中的id

mix_kw 搜索框的值

catClick:function(e){}

当选中选择分类的时候改变它当前的分类，并设置它的选中值

事件 | 微信开放文档

currentTarget

Object

当前组件的一些属性值集合

this当前对象的setData

id就是 index.wxml中的view id对象值

数据库 common/models/member/MemberCart.py

DROP TABLE IF EXISTS `member_cart`;CREATE TABLE `member_cart` (`id` int(11) unsigned NOT NULL AUTO_INCREMENT,`member_id` bigint(20) NOT NULL DEFAULT '0' COMMENT '会员id',`food_id` int(11) NOT NULL DEFAULT '0' COMMENT '商品id',`quantity` int(11) NOT NULL DEFAULT '0' COMMENT '数量',`updated_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '最后一次更新时间',`created_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '插入时间',PRIMARY KEY (`id`),KEY `idx_member_id` (`member_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COMMENT='购物车';

flask-sqlacodegen 'mysql://root:root@127.0.0.1/food_db' --tables member_cart --outfile "common/models/member/MemberCart.py"  --flask

web/controllers/api/Food.py

# -*- coding: utf-8 -*-
from web.controllers.api import route_api
from  flask import request,jsonify,g
from common.models.food.FoodCat import FoodCat
from common.models.food.Food import Food
from common.models.member.MemberCart import MemberCart
from common.models.member.MemberComments import MemberComments
from common.models.member.Member import Member
from common.libs.UrlManager import UrlManager
from common.libs.Helper import getCurrentDate,getDictFilterField,selectFilterObj
from application import app,db
from sqlalchemy import  or_@route_api.route("/food/index" )
def foodIndex():resp = { 'code':200 ,'msg':'操作成功~','data':{} }cat_list = FoodCat.query.filter_by( status = 1 ).order_by( FoodCat.weight.desc() ).all()data_cat_list = []data_cat_list.append({'id': 0,'name': "全部"})if cat_list:for item in cat_list:tmp_data = {'id':item.id,'name':item.name}data_cat_list.append( tmp_data  )resp['data']['cat_list'] = data_cat_listfood_list = Food.query.filter_by( status = 1 )\.order_by( Food.total_count.desc(),Food.id.desc() ).limit(3).all()data_food_list = []if food_list:for item in food_list:tmp_data = {'id':item.id,'pic_url':UrlManager.buildImageUrl( item.main_image )}data_food_list.append( tmp_data )resp['data']['banner_list'] = data_food_listreturn jsonify( resp )@route_api.route("/food/search" )
def foodSearch():resp = {'code': 200, 'msg': '操作成功~', 'data': {}}req = request.valuescat_id = int( req['cat_id'] ) if 'cat_id' in req else 0mix_kw = str(req['mix_kw']) if 'mix_kw' in req else ''p = int( req['p'] ) if 'p' in req else 1if p < 1:p = 1page_size = 10offset = ( p - 1 ) * page_sizequery = Food.query.filter_by(status=1 )if cat_id > 0:query = query.filter_by(cat_id = cat_id)if mix_kw:rule = or_(Food.name.ilike("%{0}%".format(mix_kw)), Food.tags.ilike("%{0}%".format(mix_kw)))query = query.filter(rule)food_list = query.order_by(Food.total_count.desc(), Food.id.desc())\.offset( offset ).limit( page_size ).all()data_food_list = []if food_list:for item in food_list:tmp_data = {'id': item.id,'name': "%s"%( item.name ),'price': str( item.price ),'min_price':str( item.price ),'pic_url': UrlManager.buildImageUrl(item.main_image)}data_food_list.append(tmp_data)resp['data']['list'] = data_food_listresp['data']['has_more'] = 0 if len( data_food_list ) < page_size else 1return jsonify(resp)@route_api.route("/food/info" )
def foodInfo():resp = {'code': 200, 'msg': '操作成功~', 'data': {}}req = request.valuesid = int(req['id']) if 'id' in req else 0food_info = Food.query.filter_by( id = id ).first()if not food_info or not food_info.status :resp['code'] = -1resp['msg'] = "美食已下架"return jsonify(resp)member_info = g.member_infocart_number = 0if member_info:cart_number = MemberCart.query.filter_by( member_id =  member_info.id ).count()resp['data']['info'] = {"id":food_info.id,"name":food_info.name,"summary":food_info.summary,"total_count":food_info.total_count,"comment_count":food_info.comment_count,'main_image':UrlManager.buildImageUrl( food_info.main_image ),"price":str( food_info.price ),"stock":food_info.stock,"pics":[ UrlManager.buildImageUrl( food_info.main_image ) ]}resp['data']['cart_number'] = cart_numberreturn jsonify(resp)@route_api.route("/food/comments")
def foodComments():resp = {'code': 200, 'msg': '操作成功~', 'data': {}}req = request.valuesid = int(req['id']) if 'id' in req else 0query = MemberComments.query.filter( MemberComments.food_ids.ilike("%_{0}_%".format(id)) )list = query.order_by( MemberComments.id.desc() ).limit(5).all()data_list = []if list:member_map = getDictFilterField( Member,Member.id,"id",selectFilterObj( list,"member_id" ) )for item in list:if item.member_id not in member_map:continuetmp_member_info = member_map[ item.member_id ]tmp_data = {'score':item.score_desc,'date': item.created_time.strftime("%Y-%m-%d %H:%M:%S"),"content":item.content,"user":{'nickname':tmp_member_info.nickname,'avatar_url':tmp_member_info.avatar,}}data_list.append( tmp_data )resp['data']['list'] = data_listresp['data']['count'] = query.count()return jsonify(resp)