我已经为交货单创建了表单，我正在使用表单formset，
forms.py
class Delivery_note_transiction_form(forms.Form):
item = forms.ModelChoiceField(label=False,queryset=Product.objects.none(),widget=Select2Widget(attrs={"class" : "item"}))
description = forms.CharField(widget=forms.TextInput(attrs={ 'placeholder' : 'optionall','class' : 'description'}),label=False,required=False)
quantity = forms.IntegerField(widget=forms.NumberInput(attrs={'class' : 'quantity'}),label=False,min_value=0)
id = forms.CharField(widget=forms.HiddenInput,required=False)
views.py
def delivery_note_creation(request):
Delivery_note_transiction_form_formset = forms.formset_factory(form=Delivery_note_transiction_form,can_delete=True)
if request.method == 'POST':
inv_no = Invoice_max.objects.get(invoice_name='delivery')
form = Deliver_Note_Main_Modelform(request.POST,initial={'delivery_invoice_no' : inv_no.invoice_no + 1})
formset = Delivery_note_transiction_form_formset(request.POST,request.FILES)
if form.is_valid() and formset.is_valid():
ins = form.save(commit=False)
ins.author = request.user
ins.save()
for transfer in formset:
Delivery_Note_Transiction.objects.create(item=transfer.cleaned_data['item'],
description=transfer.cleaned_data['description'],
quantity=transfer.cleaned_data['quantity'],
delivery_invoice_no=ins ,
)
max_invoice = Invoice_max.objects.get(invoice_name='delivery')
max_invoice.invoice_no = max_invoice.invoice_no + 1
max_invoice.save()
return HttpResponseRedirect(reverse_lazy('delivery note:delivery note home page'))
else:
invoice_create = Invoice_max.objects.get_or_create(invoice_name='delivery')
inv = Invoice_max.objects.get(invoice_name='delivery')
form = Deliver_Note_Main_Modelform(initial={ 'deliver_date' : datetime.today(), 'delivery_invoice_no' : inv.invoice_no + 1, 'total_quantity':0})
formset = Delivery_note_transiction_form_formset()
return render(request,'delivery_note/delivery note creation.html', { 'deliver_main': form,
'delivery_transiction' : formset
})
trmplate.html
{% extends 'home/base.html' %}
{% load crispy_forms_tags %}
{% block title %}
{% endblock title %}
{% block media %}
{{ deliver_main.media.css }}
{{ delivery_transiction.media.css}}
{% endblock media %}
{% block content %}
<div class="w3-container">
<h1>Delivery Note</h1>
<form method="post">{% csrf_token %}
<div class="row">
{{ deliver_main.errors }}
{{ deliver_main.non_field_errors }}
<div class="row">
<div class="col-sm-6">{{ deliver_main.customer|as_crispy_field }}</div>
<div class="col-sm-6">{{ deliver_main.deliver_date|as_crispy_field }}</div>
</div>
<div class="row">
<div class="col-sm-6">{{ deliver_main.delivery_address|as_crispy_field }}</div>
<div class="col-sm-6">{{ deliver_main.delivery_invoice_no|as_crispy_field }}</div>
</div>
</div>
<table class="w3-table-all w3-border w3-striped">
<tr>
<th class="col-sm-4">Item</th>
<th class="col-sm-4">Description</th>
<th class="col-sm-4">Quantity</th>
</tr>
{{ delivery_transiction.management_form }}
{% for error in delivery_transiction.errors %}
{{ error }}
{% endfor %}
{% for error in delivery_transiction.non_form_errors %}
{{ error }}
{% endfor %}
{% for delivery in delivery_transiction %}
<tr class=" delivery_form ">
{{ delivery.id }}
<td class="col-sm-4">{{ delivery.item|as_crispy_field }}</td>
<td class="col-sm-4">{{ delivery.description|as_crispy_field }}</td>
<td class="col-sm-4">{{ delivery.quantity|as_crispy_field }}</td>
</tr>
{% endfor %}
</table>
<button id="add-row" type="button">Add Row</button>
<div class="row ">
{{ deliver_main.description|as_crispy_field }}
{{ deliver_main.total_quantity|as_crispy_field }}
</div>
<input type="submit" value="Create">
</form>
</div>
{% endblock content %}
{% block script %}
<script>
$("#id_customer").change(function () {
var url = "{% url "delivery note:product ajax" %}";
$.ajax({
url: url,
success: function (data) {
$(".item").html(data);
alert(data)
}
})
})
</script>
<script>
{#for set address in delivery#}
$("#id_customer").change(function () {
var customer = $("#id_customer option:selected").text();
var url = "{% url 'saleinvoice:adress ajax' %}";
{#for set address#}
$.ajax({
url: url,
data: {
'customer': customer
},
success: function (data) {
$("#id_delivery_address").text(data);
}
});
});
{#col total calculation#}
$(document).on("change",".quantity", function () {
colum_calculation(".delivery_form", ".quantity", "#id_total_quantity")
})
</script>
<script>
$("#add-row").click(function () {
var url = "{% url 'delivery note:model add row' %}"
$.ajax({
url : url,
success : function (data) {
$(".delivery_form:last").after(data)
$(".django-select2").each(function () {
$(this).djangoSelect2()
})
last_formset_settings(".delivery_form", ".delivery_form:last", ".item", ".description", ".quantity")
}
})
})
</script>
{% endblock script %}
{% block end %}
{{ deliver_main.media.js }}
{{ delivery_transiction.media.js }}
{% endblock end %}
item select表单集为空，因此，当用户选择某个客户时，它将添加optio，具体取决于用户选择的客户，当在项目中添加用户select cutomer选项时，代码工作正常，但是当出现时，就会出现问题表单和模板中是否发生错误，显示错误消息，更改客户时使用ajax修改项目，选择反向返回空选项要求选择它
所以我想要一个解决方案，即使在错误消息出现在模板中的情况下，项目选择选项和用户选择的项目仍保留在项目选择中