我已经给了你足够的开始，但是你必须自己学习一些 jquery 和 javascript 来处理你从投票中得到的消息。它没有那么坏;您可以在堆栈溢出和整个互联网上使用许多示例。希望这会有所帮助。
添加到models:
class UserCalculationUpdate(models.Model)
user = models.ForeignKey(User)
stage = models.SmallIntegerField(default=0, max_length=1)
message = models.TextField(default='')
_stage_dict = {-1: 'Failed.', 0: 'On stage 1 of 3', 1: 'On stage 2 of 3',
2: 'On stage 3 of 3', 3: 'Calculation Complete!'}
def get_stage(self):
return self._stage_dict[self.stage]
运行python manage.py makemigrations，调试我犯的任何错误，然后运行python manage.py migrate。
导入您的新模型和 json 内容并编辑您的 view:
from django.http import JsonResponse
from my_app.models import UserCalculationUpdate
# I'd rename your view to something else.
def form(request):
if request.method == 'POST'
form = MyForm(request.POST)
if form.is_valid():
form = convert_form_to_model(form.cleaned_data, MyModel)
"""
looks to see if there is a UserCalculationUpdate object
corresponding to the present user. If not, it creates one
and sets obj.stage = 0 and sets created = True, otherwise,
it sets obj.stage = 0 for the object already in the db
and sets created = False
"""
obj, created = UserCalculationUpdate.objects \
.update_or_create(user=request.user,
defaults={'stage':0})
result1, success, message = step_one_calc(form)
# storing the progress in our new model, success should be
# a boolean
if success:
obj.update(stage=1)
else obj.update(stage=-1, message=message)
return HttpResponse() # whatever you want to happen when fails
result2, success, message = step_two_calc(result1, success)
if success:
obj.update(stage=2)
else obj.update(stage=-1,
message=message)
return HttpResponse() # whatever you want to happen when fails
"""
. . . and so on . . .
"""
return HttpResponseRedirect(reverse('my_app:results', args(form.id,)))
else:
return render(request, 'my_app/form.html')
else:
form = MyForm()
render(request, 'my_app/form.html')
def poll_view(request):
user_calc_update = UserCalculationUpdate.objects \
.filter(user=request.user):
if len(user_calc_update) != 0:
stage_message = user_calc_update[0].get_stage()
results_message = user_calc_update[0].message
# 0 is incomplete 1 is complete
completion_status = 0 if user_calc_update[0].stage == 3 else 1
return JsonResponse({
'message': f'{stage_message} {results_message}',
'completion_status': completion_status
})
except UserCalculationUpdate.DoesNotExist:
return JsonResponse({
'message': 'Beginning Calculations',
'completion_status': 0
})
添加到您的urls：
url(r'^calculation_poll/$', view.poll_view, name='poll_view')
确保将{% load url %} 添加到模板顶部，
如果您还没有在标题中包含 <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script> 来添加 jquery，并在模板中的某个位置添加此脚本：
<script>
// $('#id') is the jquery selector syntax for selecting an element by its id
// and manipulating it.
$('#calc_submit_button_id').click(function(){ //adding an onclick trigger
$('#loading').show(); //the 'loading' element is where you want your //information about your progress to show, this can
// a modal or a bootstrap alert or whatever you like.
// the .show() method removes any 'display:none' or
// 'display: hidden' from the style of the 'loading'
// element.
pollingFunction = $.ajax({
dataType: "json",
url:"{% url "poll_view" %}",
data: '',
success: function (message){
/* use console.log() and look at the console using inspect element
(ctrl + shift + i in chrome, right click + Q in firefox) to
examine the structure of your message
*/
console.log(message)
# Some code that decides what to do with message
if (you wish to display the message and poll again)
{
//adds message to ('#loading'), should make it prettier, but
//serves our purpose for now
('#loading').empty()
('#loading').html('<h3>' + JSON.stringify(message) + '</h3>')
//wait ten seconds, poll again
setTimeout(pollingFunction, 10000)
}
else(you wish to end polling and hide the ('#loading') element)
{
$('#loading').hide();
}
},
error: function(jqXHR){
console.log(jqXHR)
('#loading').html('<h3>Oh no, something awful happened, better check the logs.</h3>')
}
});
});
</script>