页面刷新时如何防止重新发送输入的数据F5/ Django

问题描述

请，建议。刷新page（F5）时如何转义重发会话数据。输入城市的名称，看适当的留言。如果我刷新页面（F5），则该消息仍将出现在页面上。看起来好像在刷新页面时以前的数据正在从浏览器发送到我们的应用。

views.py：

import requests
from django.shortcuts import render,redirect
from .models import City
from .forms import CityForm


def index(request):
    url = 'http://api.openweathermap.org/data/2.5/weather?q={}&units=imperial&appid='

    err_msg = ''
    message = ''
    message_class = ''

    if request.method == 'POST':
        form = CityForm(request.POST)

        if form.is_valid():
            new_city = form.cleaned_data['name']
            existing_city_count = City.objects.filter(name=new_city).count()

            if existing_city_count == 0:
                r = requests.get(url.format(new_city)).json()

                if r['cod'] == 200:
                    form.save()
                else:
                    err_msg = 'City does not exist in the world!'
            else:
                err_msg = 'City already exists in the database!'

        if err_msg:
            message = err_msg
            message_class = 'is-danger'
        else:
            message = 'City added successfully!'
            message_class = 'is-success'

    form = CityForm()

    cities = City.objects.all()

    weather_data = []

    for city in cities:
        r = requests.get(url.format(city)).json()

        city_weather = {
            'city': city.name,'temperature': int((r['main']['temp']-32)*5/9),'description': r['weather'][0]['description'],'icon': r['weather'][0]['icon'],}

        weather_data.append(city_weather)

    context = {
        'weather_data': weather_data,'form': form,'message': message,'message_class': message_class
    }

    return render(request,'weather/weather.html',context

解决方法

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django modelform refresh