Ich bin Neuling in Django. Ich verwende einfaches Ajax, um das Auswahlfeld dynamisch zu aktualisierenSemeste auf der Grundlage vonKur Auswahl. Aber beim Absenden des Formulars erhalte ich den FehlerWählen Sie eine gültige Auswahl.ausgewählte Option ist keine der verfügbaren Optionen. Code lautet wie folgt:

forms.py:

from django import forms
from feedback_form.models import course,section_info

class loginForm(forms.Form):
     iquery1 = course.objects.values_list('course_name', flat = True)
     iquery1_choices = [('', '----------')] + [(id, id) for id in iquery1]
     sem_choices = [('', '----------')]

     course_name = forms.ChoiceField(iquery1_choices,required=True, widget=forms.Select())
     semester = forms.ChoiceField(sem_choices, required= True, widget=forms.Select())

views.py:

def get_batch(request, c_id):
    current_course = feedback_form.models.course.objects.get(course_name=c_id)
    batches = feedback_form.models.batch.objects.all().filter(course_id=current_course)
    no_of_sem = feedback_form.models.course.objects.values_list('number_of_sem', flat=True).filter(course_id = current_course)
    no_of_sem = int(no_of_sem[0])
    batch_dict = {}
    for batch in batches:
         batch_dict[batch.batch_id] = batch.batch_id
    sem = {}
         sem[no_of_sem] = no_of_sem
    data = [batch_dict, no_of_sem]
    return HttpResponse(json.dumps(data))

loginForm.html:

 <form action="" method="post">
    <table>
        {{ form.as_table }}
    </table>
    {% csrf_token%}
    <input type="submit" value="Submit">
 </form>

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script>

$(document).ready(function(){
$('#id_course_name').change(function() {
    request_url = 'login/get_batch/' + c_id + '/';
    $.ajax({
        url: request_url,
        success: function(data){
            data = $.parseJSON(data);
            $('#id_semester').html('<option selected="' + "selected" + '">' + '' +'</option>');
            for(var i = 1; i<=data[1]; i++) //data[1] contains no of sem
                $('#id_semester').append('<option value="' + i + '">' + i +'</option>');
        }, 
        errors: function(e) {
            alert(e);
        }
    })

})

Bitte hilf mir