Django中提示消息messages的設置

1. 引入messages模塊

from django.contrib import messages

2. 把messages寫入view中

@csrf_exempt
def search(request):
    if request.method == 'GET':
        bookname = request.GET.get('bookname')
        bookinfo = Book.objects.filter(bookname=bookname)
        is_staff = request.user.is_staff
        username = request.user.username
        gonggao = Gonggao.objects.all().order_by("-c_time")
        liuyanban_all = liuyan.objects.all().order_by("-c_time")
        c2 = JieInfo.objects.filter(u_name=username, book_name=bookname)
        c3 = JieInfo.objects.filter(u_name=username).count()
        if username == '':
            messages.error(request, '親，請您先登錄,才能使用該功能。')
            return redirect('/')
        else:
            if bookname == '':
                messages.error(request, '親，搜索內容不能為空哦。')
                return redirect('/')
            elif c2.exists():
                messages.error(request, '對不起，您不能再次借閱該圖書了。')
                return redirect('/')
            elif c3 == 5:
                messages.error(request, '對不起，您將超出圖書館借閱圖書數量限制。')
                return redirect('/')
            else:
                if bookinfo.exists():
                    return render(request, "systeam/searched.html",
                                  {'bookinfo': bookinfo, 'username': username, 'is_staff': is_staff})
                else:
                    messages.error(request, '親，沒有這本書呢。')
                    return redirect('/')
    else:
        return render(request, "systeam/searched.html", {'username': username})

3. 把messages渲染到頁面中

{% if messages %}

    <ul class="messages">

    {% for message in messages %}


        <li{%if message.tags %} class="{{ message.tags }}"{% endif %}>
            <div class="m_title">
                {{ message.tags }}
                <a href="" id="a_tuichu">
                    <i class="iconfont icon-fork"></i>
                </a>
            </div>
            <div id="m_box">
                {{ message }}
            </div>
            <a href="" id="a_sure">
                <button id="button_sure">
                確認
                </button>
            </a>
        </li>

    {% endfor %}

    </ul>

    {% endif %}