1. 引入messages模块
1 from django.contrib import messages
2. 把messages写入view中
1 @csrf_exempt
2 def search(request):
3 if request.method == 'GET':
4 bookname = request.GET.get('bookname')
5 bookinfo = Book.objects.filter(bookname=bookname)
6 is_staff = request.user.is_staff
7 username = request.user.username
8 gonggao = Gonggao.objects.all().order_by("-c_time")
9 liuyanban_all = liuyan.objects.all().order_by("-c_time")
10 c2 = JieInfo.objects.filter(u_name=username, book_name=bookname)
11 c3 = JieInfo.objects.filter(u_name=username).count()
12 if username == '':
13 messages.error(request, '亲，请您先登录,才能使用该功能。')
14 return redirect('/')
15 else:
16 if bookname == '':
17 messages.error(request, '亲，搜索内容不能为空哦。')
18 return redirect('/')
19 elif c2.exists():
20 messages.error(request, '对不起，您不能再次借阅该图书了。')
21 return redirect('/')
22 elif c3 == 5:
23 messages.error(request, '对不起，您将超出图书馆借阅图书数量限制。')
24 return redirect('/')
25 else:
26 if bookinfo.exists():
27 return render(request, "systeam/searched.html",
28 {'bookinfo': bookinfo, 'username': username, 'is_staff': is_staff})
29 else:
30 messages.error(request, '亲，没有这本书呢。')
31 return redirect('/')
32 else:
33 return render(request, "systeam/searched.html", {'username': username})
3. 把messages渲染到页面中
1 {% if messages %}
2
3 <ul class="messages">
4
5 {% for message in messages %}
6
7
8 <li{%if message.tags %} class="{{ message.tags }}"{% endif %}>
9 <div class="m_title">
10 {{ message.tags }}
11 <a href="" id="a_tuichu">
12 <i class="iconfont icon-fork"></i>
13 </a>
14 </div>
15 <div id="m_box">
16 {{ message }}
17 </div>
18 <a href="" id="a_sure">
19 <button id="button_sure">
20 确认
21 </button>
22 </a>
23 </li>
24
25 {% endfor %}
26
27 </ul>
28
29 {% endif %}
