Django 如何使用 AJAX 将数据发送到 django 调度程序 url？

Question

所以我试图在this website 中使用ajax 将类别发送到django url（通过url 访问时采用类别），但我收到了这个我似乎不明白的错误。请帮忙！

urls.py

urlpatterns=[
    path('category/<str:category>', views.getcategory, name = 'get_category'),
]

views.py：

def get_category(request, category=None):
    
    #To get category if requested via AJAX
    if request.is_ajax and request.method == "GET":
        
        category = request.GET.get("last_joke_id", category)
    
    if category!=None:
        return HttpResponse('\n Received via Json. \n')
    else:
        return HttpResponse('\n Received via URL. \n')

index.html：

<script>
function send_category(category){
  $.ajax({
    type: 'POST',
    *url:"{% url 'get_category' %}"*, /*Error in this line*/
    data: {'category':category},
    success: function(response) {
      console.log("\n\nCategory data Successfully recived.\n");
      console.log( response );
      //displayJokes(response);
    
    }, error: function (response) {
         console.log('\n\n error in retriving category data:');
         console.log(response);
         //return 'her';
       }
    
  })
}
</script>

错误信息：

<b>django.urls.exceptions.NoReverseMatch: Reverse for 'get_category' with no arguments not found. 1 pattern(s) tried: ['jokes/category/(?P[^/]+)$']</b>

Answer 1

这意味着category是你的路由中的必需参数，所以如果你改变你的路由和视图功能，你可以解决这个问题，像这样：

urls.py

path('category/', views.getcategory, name = 'get_category'),

views.py

def getcategory(request):
    category = request.GET.get("category")

    if request.is_ajax and request.method == "GET":
        category = request.GET.get("last_joke_id", category)

    if category!=None:
        return HttpResponse('\n Received via Json. \n')
    else:
        return HttpResponse('\n Received via URL. \n')

或者你可以创建两个路由，带参数和不带参数：

path('category/', views.getcategory, name = 'get_category_default'),
path('category/<str:category>', views.getcategory, name = 'get_category'),

然后你需要在你的函数中设置默认值：

def get_category(request, category=None):
    ...

最后，您需要在 js 代码中将 get_category 路由替换为 get_category_default