Django request GET

Question

It seems I can t make this example print  quot You submitted nothing  quot   Every time I submit an empty form it says   You submitted  u    instead of   You submitted nothing   Where did I go wrong  views py def search request       if  q  in request GET          message    You submitted   r    request GET  q       else          message    You submitted nothing        return HttpResponse message   template   lt html gt       lt head gt           lt title gt  Search  lt  title gt       lt  head gt       lt body gt           lt form action  quot  search  quot   method  quot get quot   gt           lt input type  quot text quot  name    quot q quot  gt           lt input type  quot submit quot value  quot Search quot   gt           lt  form gt       lt  body gt   lt  html gt

User · Answer

msg   request GET get  q   default   if  msg    default       message    quot YOU SUBMITTED NOTHING quot  else       message    quot you submitted    s quot   msg quot  return HttpResponse message

User · Answer

Here is a good way to do it   from django utils datastructures import MultiValueDictKeyError try      message    You submitted   r    request GET  q   except MultiValueDictKeyError      message    You submitted nothing     You don t need to check again if q is in GET request  The call in the QueryDict get already does that to you

User · Answer

def search request   if  q  in request GET keys        message    You submitted   r    request GET  q   else      message    You submitted nothing    return HttpResponse message    you can use if     in too

User · Answer

In python  None  0     empty string   False are all accepted None   So   if request GET  q       true if q contains anything but not        message else        since this returns    ant this is equals to None     error

User · Answer

q   request GET get  q   None  if q      message    q   s    q else      message    Empty

User · Answer

since your form has a field called  q   leaving it blank still sends an empty string   try  if  q  in request GET and request GET  q                message else      error message

User · Answer

from django http import QueryDict  def search request   if request GET    contains    q        message    You submitted   r    request GET  q   else      message    You submitted nothing   return HttpResponse message    Use this way  django offical document recommended   contains   method  See https   docs djangoproject com en 1 9 ref request-response

User · Answer

Calling  search  should result in  you submitted nothing   but calling  search  q  on the other hand should result in  you submitted u     Browsers have to add the q  even when it s empty  because they have to include all fields which are part of the form  Only if you do some DOM manipulation in Javascript  or a custom javascript submit action   you might get such a behavior  but only if the user has javascript enabled  So you should probably simply test for non-empty strings  e g   if request GET get  q        message    You submitted   r    request GET  q   else      message    You submitted nothing

[django] Django request.GET

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