django在提交时定义变量之前阻止访问该变量

我有下面的django视图，除了在我发送帖子信息的前一个视图中单击submitted按钮之外，它工作得非常好

def submitted(request):
# sets the employeentname to the username from the POST of results
    owner = ADMirror.objects.get (employeentname=request.POST.get('userpost'))
# sets the firstname of owner
    firstname = owner.employeefirstname
# sets the lastname of owner
    lastname = owner.employeelastname
# gets the POST list for the report_id values in the checkboxes for application names
    checkedlist = request.POST.getlist('report_id')
    reportdetail = QvReportList.objects.filter(report_id__in = checkedlist).values_list('report_name_sc', flat = True).distinct()



# gets the timestamp from the system clock when the submit button is pressed
    access_request_date = timezone.now()
####  Unused at this time, but we can pull the division CFO and facility CFO based on the tables Gregg created in the SQL server database.  We'll let the workflow tool handle this part.
#    facilitycfo =  QvDatareducecfo.objects.filter(dr_code__exact = '34222', active = 1, cfo_type = 1).values_list('cfo_ntname', flat = True)
#    divisioncfo =  QvDatareducecfo.objects.filter(dr_code__exact = '34222', active = 1, cfo_type = 2).values_list('cfo_ntname', flat = True)
    #print (facilitycfo)
    #print (divisioncfo)
# gets the access level ie facility, division, market, group, corporate from the results.html POST request sent to submitted.html
    selectedaccesslevel = request.POST.get('accesslevelid')
# sets access level name and organization level name for the submitted page
    if request.method == 'POST' and selectedaccesslevel == '3':
        accesslevel = 'company-wide access'
        orglevelname = ''
    if request.method == 'POST' and selectedaccesslevel == '4':
        accesslevel = 'group level access'
        accesslevelname = request.POST.getlist('blevel')
        orglevelname = FacilityDimension.objects.filter(b_level__in = accesslevelname).values_list('group_name', flat = True).distinct()
    if request.method == 'POST' and selectedaccesslevel == '5':
        accesslevel = 'division level access'
        accesslevelname = request.POST.getlist('rlevel')
        orglevelname = FacilityDimension.objects.filter(r_level__in = accesslevelname).values_list('division_name', flat = True).distinct()
    if request.method == 'POST' and selectedaccesslevel == '6':
        accesslevel = 'market level access'
        accesslevelname = request.POST.getlist('dlevel')
        orglevelname = FacilityDimension.objects.filter(d_level__in = accesslevelname).values_list('market_name', flat = True).distinct()

    if request.method == 'POST' and selectedaccesslevel == '7':
        accesslevel = 'facility level access'
        accesslevelname = request.POST.getlist('zcoid')
        orglevelname = FacilityDimension.objects.filter(coid__in = accesslevelname).values_list('coid_name', flat = True).distinct()




# gets the PHI boolean flag from the results.html POST request sent to submitted.html
    selectedphi = request.POST.get('phi')

# if statements to define hte datarduce code based on the selected access level sent from the results.html POST
## corporate
    if request.method == 'POST' and selectedaccesslevel == '3':
        selectlist = "S00001"
# group
    if request.method == 'POST' and selectedaccesslevel == '4':
        selectlist = request.POST.getlist('blevel')
# division
    if request.method == 'POST' and selectedaccesslevel == '5':
        selectlist = request.POST.getlist('rlevel')
# market
    if request.method == 'POST' and selectedaccesslevel == '6':
        selectlist = request.POST.getlist('dlevel')
# facility
    if request.method == 'POST' and selectedaccesslevel == '7':
        selectlist = request.POST.getlist('zcoid')
        selectlist = [f'Z{value}' for value in selectlist]

# nested if/for statement which writes to the [QlikView].[dbo].[QV_FormAccessRequest] table if a corporate access level is selected the datareduce code is set to S00001
    if request.method == 'POST':
        for i in checkedlist:
            if selectedaccesslevel == '3':
                    requestsave = QVFormAccessRequest(ntname = 'HCA\\'+owner.employeentname, first_name = owner.employeefirstname, last_name = owner.employeelastname, coid = owner.coid, title = owner.title
                                                    ,report_id = i, accesslevel_id = selectedaccesslevel, phi = selectedphi , access_beg_date = access_request_date, previousdatareducecode = '',  datareducecode = 'S00001', facility = owner.facilityname, requestid = '0', requesttype = 'New')# = list(facilitycfo)[0], division_cfo = list(divisioncfo)[0] )
                    requestsave.save()
# part of the nested if/for statement above which writes to [QlikView].[dbo].[QV_FormAccessRequest] if anything other than corporate user is selected it will chose the correct data reduce code based on the select list if statements above.
            else:
                for j in selectlist:
                    requestsave = QVFormAccessRequest(ntname = 'HCA\\'+owner.employeentname, first_name = owner.employeefirstname, last_name = owner.employeelastname, coid = owner.coid, title = owner.title
                                            ,report_id = i, accesslevel_id = selectedaccesslevel, phi = selectedphi , access_beg_date = access_request_date,previousdatareducecode = '', datareducecode = j, facility = owner.facilityname,requestid = '0', requesttype = 'New' )# = list(facilitycfo)[0], division_cfo = list(divisioncfo)[0] )
                    requestsave.save()

    args = {'firstname' : firstname, 'lastname' : lastname, 'owner' : owner, 'accesslevel':accesslevel, 'reportdetail':reportdetail, 'orglevelname':orglevelname}
    return render(request, 'submitted.html', args)

我的表单上有多个按钮，所以我不能使用required，因为它会干扰另一个按钮的操作，所以我使用下面的javascript验证

function submitFormSub(action) {
  var form = document.getElementById('form1');
  form.action = action;
  var accesslevelid = document.getElementById('accesslevelid');
  if (form.action == 'submitted')
  {
    if ($('#accesslevelid').val() == "")
  {
      alert('Please select an access level');
      return false;
    }

    form.submit();
  }

}

正如我看到的警报一样，上面的验证工作得非常好，但是表单仍然试图提交，我遇到了以下错误

local variable 'accesslevel' referenced before assignment

有几个选择：

1将您的表单转换为Django表单，这样您就可以重写验证方法，从而在调用其is_valid方法并失败时让它回退表单。这几乎肯定是最干净的。您还可以使用字段上的choices关键字定义不同的选项，并清理大量不必要的代码

2调用selectedaccesslevel=request.POST.get'accesslevelid'，None和on None跳到呈现返回，没有尝试设置访问级别和不处理表单以创建QVFormAccessRequest实例的逻辑

解释：

selectedaccesslevel = request.POST.get('accesslevelid', None)
if selectedaccesslevel:
   # all your code that defines and sets access levels that you
   # don't want to run because it doesn't have a crucial bit of info
args = {'firstname' : firstname, 'lastname' : lastname, 'owner' : owner, 'accesslevel':accesslevel, 'reportdetail':reportdetail, 'orglevelname':orglevelname}
return render(request, 'submitted.html', args) 

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基于在多个表单中移动数据的需求，我在使用Django表单时遇到了一些问题，所以我不能这样做。我在哪里可以跳过返回没有逻辑的返回？这对我来说很好，但是现在我如何让它返回原始视图而不是得到这个错误：视图mysite.search.views.submitted没有返回HttpResponse对象。它没有返回任何结果。我会检查缩进和逻辑流。您遇到了不返回渲染的情况。