Django使用AJAX調(diào)用自己寫的API接口的方法

更新時間：2019年03月06日 08:52:08 作者：派派森森

這篇文章主要介紹了Django使用AJAX調(diào)用自己寫的API接口的方法，小編覺得挺不錯的，現(xiàn)在分享給大家，也給大家做個參考。一起跟隨小編過來看看吧

在這個例子中，我們將使用Django編寫?zhàn)I了么高校外賣商家查詢API接口，并且使用AJAX技術(shù)來實(shí)現(xiàn)API接口的使用，包括使用ajax get方法加載更多數(shù)據(jù)，使用ajax方法來更新、修改、新增、刪除數(shù)據(jù)。利用API可以做到前后端分離，為開發(fā)web應(yīng)用提供了便利。

安裝rest framework

首先使用Pycharm新建一個Django項(xiàng)目，并且使用virtualenv或者pipenv虛擬環(huán)境

創(chuàng)建成功會自動安裝Django2.1和所需依賴，restframework框架需要自己手動安裝

//激活虛擬環(huán)境安裝以下
(venv)$ pip install djangorestframework
(venv)$ pip install django-filter 
(venv)$ pip install pytest
(venv)$ pip install pytest-django 
//由于筆者使用Postgresql數(shù)據(jù)庫，所以還需要安裝以下
(venv)$ pip install psycopg2
//使用mysql數(shù)據(jù)庫安裝如下
(venv)$ pip install pymysql

準(zhǔn)備數(shù)據(jù)來提供服務(wù)

數(shù)據(jù)來源：餓了么爬蟲

數(shù)據(jù)內(nèi)容：全國所有大學(xué)附近的外賣商家Top20

數(shù)據(jù)需要導(dǎo)入數(shù)據(jù)庫

Django編寫rest api接口

項(xiàng)目結(jié)構(gòu)

settings.py.

// 安裝的app如下
INSTALLED_APPS = [
 #...
 'rest_framework',
 'django_filters',
 'api.apps.ApiConfig',
 'front.apps.FrontConfig',
]
//restframework 配置如下
REST_FRAMEWORK = {
//這里配置了分頁處理，每頁最多20個項(xiàng)目
'DEFAULT_PAGINATION_CLASS':'api.custompagination.LimitOffsetPaginationWithUpperBound',
 'PAGE_SIZE': 20,
 'DEFAULT_FILTER_BACKENDS': (
 //這里配置了排序、過濾、搜索器
 'django_filters.rest_framework.DjangoFilterBackend',
 'rest_framework.filters.OrderingFilter',
 'rest_framework.filters.SearchFilter',
 ),
 //這里配置了用戶認(rèn)證，管理員才可以更改內(nèi)容，未登錄不能更改
 'DEFAULT_AUTHENTICATION_CLASSES':(
 'rest_framework.authentication.BasicAuthentication',
 'rest_framework.authentication.SessionAuthentication',
 ),
 //這里配置了訪問次數(shù)限制，過多會返回429錯誤 too many requests
 'DEFAULT_THROTTLE_CLASSES': (
 'rest_framework.throttling.AnonRateThrottle',
 'rest_framework.throttling.UserRateThrottle',
 ),
 //這里配置了訪問次數(shù)，anon代表匿名用戶，user代表已登錄用戶，entries是我自己設(shè)置的作用域，300/hour代表最多300次每小時
 'DEFAULT_THROTTLE_RATES': {
 'anon': '300/hour',
 'user': '100/hour',
 'entries': '200/hour',
 },
 'DEFAULT_VERSIONING_CLASS':'rest_framework.versioning.NamespaceVersioning',
}

models.py.

from django.db import models
class Entry(models.Model):
 city = models.CharField(max_length=50)
 school = models.CharField(max_length=100)
 link = models.CharField(max_length=100,null=True,default='null')
 name = models.CharField(max_length=200)
 lat = models.CharField(max_length=20,null=True,default='0.0')
 lng = models.CharField(max_length=20,null=True,default='0.0')
 address = models.CharField(max_length=200,null=True,default='null')
 distance = models.CharField(max_length=20,null=True,default='0')
 time = models.CharField(max_length=20,null=True,default='0:00')
 contact = models.CharField(max_length=200,null=True,default='null')
 score = models.CharField(max_length=10,null=True,default='0')
 comments = models.CharField(max_length=20,null=True,default='0')
 sell = models.CharField(max_length=20,null=True,default='0')
 image = models.CharField(max_length=200,null=True,default='null')
 owner = models.ForeignKey('auth.User',related_name='entries',on_delete=models.CASCADE)
 # class Meta:
 # ordering = ('name',)
 def __str__(self):
 return self.name

serializers.py.

from rest_framework import serializers
from api.models import Entry
//這里繼承自超鏈接模型序列器，用于把數(shù)據(jù)轉(zhuǎn)換為json格式，并且顯示鏈接
class EntrySerializer(serializers.HyperlinkedModelSerializer):
 owner = serializers.ReadOnlyField(source='owner.username')
 class Meta:
 model = Entry
 fields = ('url','pk','name','city','school','link','lat','lng','address','distance','time','contact',
 'score','comments','sell','image','owner')

views.py.

from rest_framework import generics
from rest_framework.response import Response
from rest_framework.reverse import reverse
from api.models import Entry
from api.serializers import EntrySerializer
from rest_framework import permissions
from rest_framework.permissions import IsAuthenticated
from rest_framework.throttling import ScopedRateThrottle
from api import custompermission
//這里是獲取所有數(shù)據(jù)，可實(shí)現(xiàn)HTTP get、Post、Option操作
class EntryList(generics.ListCreateAPIView):
 //限流自定義作用域
 throttle_scope = 'entries'
 throttle_classes = (ScopedRateThrottle,)
 queryset = Entry.objects.all()
 serializer_class = EntrySerializer
 name = 'entry-list'
 filter_fields = ('city','school','name')
 search_fields = ('school','city')
 ordering_fields = ('city')

 //管理員才能post操作創(chuàng)建新的數(shù)據(jù)
 permission_classes = (
 permissions.IsAuthenticatedOrReadOnly,
 custompermission.IsCurrentUserOwnerOrReadOnly,
 )
 def perform_create(self, serializer):
 serializer.save(owner=self.request.user)

//這里是獲取具體某一項(xiàng)的數(shù)據(jù)，可實(shí)現(xiàn)HTTP GET、PUT、PATCH、Option操作
class EntryDetail(generics.RetrieveUpdateDestroyAPIView):
 throttle_scope = 'entries'
 throttle_classes = (ScopedRateThrottle,)
 queryset = Entry.objects.all()
 serializer_class = EntrySerializer
 name = 'entry-detail'
 permission_classes = (
 permissions.IsAuthenticatedOrReadOnly,
 custompermission.IsCurrentUserOwnerOrReadOnly,
 )
//api根目錄
class ApiRoot(generics.GenericAPIView):
 name = 'api-root'
 def get(self, request, *args, **kwargs):
 return Response({
 'entries': reverse(EntryList.name, request=request),
 })

urls.py.

from django.urls import path
from api import views
urlpatterns = [
 path('entries/', views.EntryList.as_view(), name=views.EntryList.name),
 path('entry-detail/<int:pk>', views.EntryDetail.as_view(), name=views.EntryDetail.name),
 path('', views.ApiRoot.as_view(), name=views.ApiRoot.name)
]

ele/urls.py.

from django.urls import path,include
urlpatterns = [
 path('v1/',include('api.urls')),
 path('v1/api-auth/',include('rest_framework.urls')),
 path('',include('front.urls'))
]

以下為啟動界面

到此為止非常簡單的api就寫完了，接下來就是自動化測試是否達(dá)到預(yù)期效果。如圖，測試通過！

在程序中調(diào)用剛剛寫好的api

創(chuàng)建一個新的app并且添加到settings.py里面

(venv)$ python manage.py startapp front

做好的效果如下：點(diǎn)擊加載更多會觸發(fā)ajax

由于篇幅有限，這里貼出js代碼使用ajax get請求剛剛寫好的api接口并且添加到表格中

myjs.js.

$('#load-more').click(function () {
 $.ajax({
 method:'GET',
 url:api_url,
 dataType:'json',
 success:function (data) {
 api_url = data['next'];
 if (api_url == null){
 $('#load-more').val('已加載全部');
 $('#load-more').attr('disabled',true);
 //api_url這里就是剛剛寫好的api接口
 api_url = 'v1/entries/';
 }
 var results = data['results'];
 for (i=0;i<results.length;i++){
 $('#ele-table-body').append(
 ' <tr>\n' +
 ' <th scope="col">'+results[i]['pk']+'</th>\n' +
 ' <th scope="col">'+results[i]['city']+'</th>\n' +
 ' <th scope="col"><a href="/detail/' + results[i]['pk'] +'" rel="external nofollow" >' + results[i]['name'] + '</a></th>\n' +
 ' <th scope="col">'+results[i]['school']+'</th>\n' +
 ' <th scope="col">'+results[i]['score']+'</th>\n' +
 ' </tr>'
 )
 }
 }
 })
 });

可以修改具體的一條數(shù)據(jù)，使用ajax patch方法提交數(shù)據(jù)。注：PUT方法是修改所有數(shù)據(jù)，而PATCH方法是修改局部數(shù)據(jù)

myjs.js.

 $('#edit-confirm-btn').click(function () {
 var name = $('#name').val();
 var distance = $('#distance').val();
 var adderss = $('#address').val();
 var time = $('#time').val();
 var score = $('#score').val();
 var comments = $('#comments').val();
 var sell = $('#sell').val();
 var pk = $('#pk').val();
 $.ajax({
 type:'PATCH',
 url:'/detail/' + pk,
 data:{
 "name": name,
 "distance": distance,
 "address": adderss,
 "time": time,
 "score": score,
 "comments": comments,
 "sell": sell,
 },
 success:function (data) {
 if (data.status == 'ok'){
 console.log('success');
 location.reload();
 }
 }
 })
 })

本文通過一個小例子介紹了如何使用Django調(diào)用自己寫的api

以上就是本文的全部內(nèi)容，希望對大家的學(xué)習(xí)有所幫助，也希望大家多多支持腳本之家。

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