Django:将值从模板传递到视图 [英] Django: Passing value from template to view

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问题描述

我有这种情况:



点击html提交按钮,我调用 views.stream_response 激活 views.stream_response_generator 其中激活stream.py 并返回一个 StreamingHttpResponse ,我看到逐行数字第二个 m / stream_response /

  1 
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7
8 // eg我的默认最大值m

stream.py

 从django.template导入上下文,模板
import time


def streamx(m) :
lista = []
x = 0
while len(lista)< m:
x = x + 1
time.sleep(1)
lista.append(x)
yield< div>%s< / div> \\\
%x #prints浏览器
print(lista)#print on eclipse
return(x)

views.py

  def stream_response(request)://统一三函数如建议

如果request.method =='POST':
form = InputNumeroForm(request.POST)
如果form.is_valid():
m =请求.POST.get('numb',8)
resp = StreamingHttpResponse(stream.streamx(m))
return resp

forms.py

  from django.db import模型
from django import forms
from django.forms import ModelForm

class InputNumero(models.Model):
m = models.IntegerField()


class InputNumeroForm(forms.Form):
class Meta:
models = InputNumero
fields =('m',)

urls.py

  ... 
url(r'^ homepage / provadata / $',views.provadata ),
url(r'^ stream_response / $',views.stream_response,name ='stream_response'),
...

首页/ provadata.html

  ; form id =streamformaction ={%url'stream_response'%}method =POST> 
{%csrf_token%}
{{form}}
< input id =numbtype =number/>
< input type =submitvalue =查看id =streambutton/>
< / form>

如果我删除8,只使用 m = request.POST。 get('numb')我获取:


在/ stream_response /视图主页的ValueError。 views.stream_response没有返回一个HttpResponse对象。
它返回无。


所以,如果我尝试提交,只需要默认值8(和工作),但它不需要我的表单输入。什么是错误?



- >更新:与@Tanguy Serrat建议:



views.py

  def stream_response(request):
form = InputNumeroForm()
如果request.method =='POST':
form = InputNumeroForm(data = request.POST)
如果form.is_valid():
#访问clean_data中的数据
m = form.cleaned_data ['numero']

print(My form html:%s%form)
print(My Number:%s%m)#watch你的命令行
print(m =,m)
resp = StreamingHttpResponse(stream.streamx(m))
return resp

#如果不提供模板中的表单:
return render(request,'homepage / provadata.html',{'form':form,})

forms.py

  class InputNumeroForm .Form):
numero = models.IntegerField()

homepage / provadata.py

 < form action =/ stream_response /method =POST> 
{%csrf_token%}
{{form}}<! - 问题:不出现在html !!!!! - >
< input type =numbername =numero/> <! - 所以我写这个 - >
< input type =submitvalue =查看/>
< / form>

如果我输入例如7从键盘:


/ stream_response /

上的KeyError

'numero'




WHILE



如果我写 m = request.POST.get('numero'),在命令行我有:

  ... 
我的表单html:
我的号码: 7
m = 7
...
while len(lista)< m:
TypeError:不顺序类型:int()< str()


解决方案

编辑: ModelForm部分已删除,无需将数据保存到DB中,所以使用经典格式:



方法1:您的 forms.py 中的Django





  from django import forms 

class InputNumeroForm(forms.Form):

numero = forms.IntegerField()
pre>

在您的 views.py

  from django.shortcuts import render 

def stream_response(request):
form = InputNumeroForm()
if request.method =='POST':
form = InputNumeroForm(data = request.POST)
如果form.is_valid():
#访问clean_data中的数据
m = form.cleaned_data ['numero']
print我的数字%s%m #watch你的命令行
resp = StreamingHttpResponse(stream.streamx(m))
返回resp

#如果不是在模板中提供表单:
return render(request,'homepage / provadata .html',{
'form':form,
})

在您的模板中:

 < form id =streamformaction ={%url'stream_response'%}method = POST > 
{%csrf_token%}
{{form}}
< input type =submitvalue =查看id =streambutton/>
< / form>

要澄清一点,Django中有两种类型的表单:




  • 不需要保存在数据库中的经典表单

  • 可以让您创建基于数据库的表单的模型表单模型ie(您可以添加一行到您的数据库或编辑一个)



这里您不需要将您的号码保存在数据库,因此您使用古典表单:
https://docs.djangoproject.com /en/1.8/topics/forms/



方法2:不使用Django窗体
非常简单



views.py

  from django.shortcuts import render 

def stream_response(request):
if request.method =='POST':
if request.POST.get( 'numero',False):
m = int(request.POST ['numero'])
打印我的号码%s%m #watch你的命令行
resp = StreamingHttpResponse(stream.streamx(m))
return resp

return render请求,homepage / provadata.html)

在您的模板中:

 < form id =streamformaction ={%url'stream_response'%}method =POST> 
{%csrf_token%}
< input type =numbername =numero/>
< input type =submitvalue =查看id =streambutton/>
< / form>


I HAD this situation:

Clicking on a html submit button, I call views.stream_response which "activates" views.stream_response_generator which "activates" stream.py and return a StreamingHttpResponse and I see a progressive number every second up to m at /stream_response/:

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8  //e.g. my default max value for m

stream.py

from django.template import Context, Template
import time         


def streamx(m):
    lista = []
    x=0
    while len(lista) < m:      
        x = x + 1
        time.sleep(1)
        lista.append(x)
        yield "<div>%s</div>\n" % x  #prints on browser
        print(lista)     #print on eclipse
    return (x)

views.py

def stream_response(request):   // unified the three functions as suggested

if request.method == 'POST':
    form = InputNumeroForm(request.POST)
    if form.is_valid():
        m = request.POST.get('numb', 8)
        resp = StreamingHttpResponse(stream.streamx(m))
        return resp

forms.py

from django.db import models
from django import forms
from django.forms import ModelForm

class InputNumero(models.Model):
    m = models.IntegerField()


class  InputNumeroForm(forms.Form):    
    class Meta:
        models = InputNumero
        fields = ('m',)

urls.py

...
url(r'^homepage/provadata/$', views.provadata),    
url(r'^stream_response/$', views.stream_response, name='stream_response'),
...

homepage/provadata.html

<form id="streamform" action="{% url 'stream_response' %}" method="POST">
  {% csrf_token %}
  {{form}}
  <input id="numb" type="number"  />
  <input type="submit" value="to view" id="streambutton" />
</form>

If I delete "8" and use only m = request.POST.get('numb') I obtain:

ValueError at /stream_response/ The view homepage.views.stream_response didn't return an HttpResponse object. It returned None instead.

So, if I try to submit, it takes only the default value 8 (and works) but it not takes my form input. What is it wrong?

-->UPDATE: with @Tanguy Serrat suggestions:

views.py

def stream_response(request):
    form = InputNumeroForm()
    if request.method == 'POST':
        form = InputNumeroForm(data=request.POST)
        if form.is_valid():
            #Accessing the data in cleaned_data
            m = form.cleaned_data['numero']

            print("My form html: %s" % form)      
            print ("My Number: %s" % m) #watch your command line
            print("m = ", m) 
            resp = StreamingHttpResponse(stream.streamx(m))
            return resp

    #If not post provide the form here in the template :
    return render(request, 'homepage/provadata.html', {'form': form,})

forms.py

class  InputNumeroForm(forms.Form):
    numero = models.IntegerField()

homepage/provadata.py

<form  action="/stream_response/" method="POST">
    {% csrf_token %}
    {{form}}                                <!--issue: does not appear on the html !!!!!-->
    <input type="number" name="numero" />   <!--so I write this-->
    <input type="submit" value="to view" />
</form>

If I give as input e.g. 7 from keyboard:

KeyError at /stream_response/

'numero'

WHILE

If I write m = request.POST.get('numero'), in command line I have:

...
My form html: 
My Number: 7
m =  7
...
   while len(lista) < m:
   TypeError: unorderable types: int() < str()

解决方案

EDIT : ModelForm part removed, no need to save the data in DB so using classic form this way :

Method 1 : Classic Form without Model using Django

in your forms.py

from django import forms

class InputNumeroForm(forms.Form):

    numero = forms.IntegerField()

in your views.py

from django.shortcuts import render

def stream_response(request):
    form = InputNumeroForm()
    if request.method == 'POST':
        form = InputNumeroForm(data=request.POST)
        if form.is_valid():
            #Accessing the data in cleaned_data
            m = form.cleaned_data['numero']      
            print "My Number %s" % m #watch your command line 
            resp = StreamingHttpResponse(stream.streamx(m))
            return resp

    #If not post provide the form here in the template :
    return render(request, 'homepage/provadata.html', {
        'form': form,
    })

in your template :

<form id="streamform" action="{% url 'stream_response' %}" method="POST">
  {% csrf_token %}
  {{ form }}
  <input type="submit" value="to view" id="streambutton" />
</form>

To clarify a little there are two types of form in Django :

  • Classic Forms which do not require saving in a database
  • Model Forms which will allow you to create forms which are based on a Database Model i.e. (you can add a row to your db or edit one)

Here you don't need to save your number in your database so you use classical forms: https://docs.djangoproject.com/en/1.8/topics/forms/

Method 2 : Not using the Django Form For very simple forms like your case :

in views.py

from django.shortcuts import render

def stream_response(request):
    if request.method == 'POST':
        if request.POST.get('numero', False):
            m = int(request.POST['numero'])      
            print "My Number %s" % m #watch your command line 
            resp = StreamingHttpResponse(stream.streamx(m))
            return resp

    return render(request, 'homepage/provadata.html')

in your template :

<form id="streamform" action="{% url 'stream_response' %}" method="POST">
  {% csrf_token %}
  <input type="number" name="numero" />
  <input type="submit" value="to view" id="streambutton" />
</form>

这篇关于Django:将值从模板传递到视图的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!

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