*This implementation is using Django 4.0 and Bootstrap5 with CrispyForms.*

**Objective:** The user selecting a value in one field determines whether another field is shown or hidden. By default, the conditional field has a value of "No". The impacted field will be shown when the user changes the conditional field to the value of "Yes". Specifically, if the user selects "Yes" for the field Recurring event the field Recurrence pattern will be shown.

Please note that the implementation of Class Based Views in the template is working great. Here's a screenshot of the form (with the conditional field requirement not working):
[![Working form screenshot](https://i.stack.imgur.com/unZXw.png)](https://i.stack.imgur.com/unZXw.png)

**Existing code (relevant snippets only)**

Here's what I have in models.py:

```
YES_NO_CHOICES = [
    ('No', 'No'),
    ('Yes', 'Yes'),
]
RECURRENCE_PATTERN_CHOICES = [
    ('---', '---'),
    ('Daily', 'Daily'),
    ('Weekly', 'Weekly'),
    ('Monthly', 'Monthly'),
    ('Yearly', 'Yearly'),
]

class Event(models.Model):
    event_name = models.CharField(
        max_length=70,
        help_text='''Enter a name for the event. This is a required field and is limited to 70 characters.'''
    )
    recurring_event = models.CharField(
        max_length=5,
        choices=YES_NO_CHOICES,
        default='No',
        help_text='''Is this a one off event or will it recur? Selecting Yes will open up additional fields.'''

    )
    recurrence_pattern = models.CharField(
        max_length=10,
        choices=RECURRENCE_PATTERN_CHOICES,
        default='---',
        help_text='''Select the recurrence pattern for this event.'''
    )

```

Here is what I have in forms.py:

```
class EventStaffSummaryUpdateView(UpdateView):
    """Event Staff Update view - allows staff to change event details"""
    model = Event
    template_name = 'events/event_staff_summary_form.html'
    fields = [
            'event_name',
            'recurring_event',
            'recurrence_pattern',
    ]
    context_object_name = 'event'

```

In the event\_staff\_summary.html template (using inheritance) I have:

```
   <div class="content-section">
        <form method="POST">
            {% csrf_token %}
            <fieldset class="form-group">
                <div id="event_name">
                    {{ form.event_name|as_crispy_field }}
                </div>
                <div id="recurring_event">
                    {{ form.recurring_event|as_crispy_field }}
                </div>
                <div id="recurrence_pattern">
                    {{ form.recurrence_pattern|as_crispy_field }}
                </div>
            </fieldset>
            <div class="form-group pt-4 pb-2">
                {% if page_type == 'Update' %}
                    <button class="btn btn-BlueGray" type="submit">Update Event</button>
                {% else %}
                    <button class="btn btn-BlueGray" type="submit">Create Event</button>
                {% endif %}
            </div>
        </form>
    </div>

```

In the base.html template I am using the Google JQuery link (found on my journey as a simple way of implementing JQuery):

```
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js"></script>

```

As you can see with the screenshot, the form itself is displaying perfectly. So models, form and even the html is working to this point. The update class based view is working with the DB. All that remains is to show or hide Recurrence pattern based on the value in the field Recurrence event. Which brings me to...

**What have I tried so far?**

Of the 10+ JS snippets I've come across and tried, here is the leading candidate that seems to be closest. I really *want* this to work as it makes sense to me.

```
    <script>
        $("#recurring_event").change(function() {
            if ($(this).val() === "Yes") {
                $('#recurrence_pattern').show();
            } else {
                $('#recurrence_pattern').hide();
            }
         });
    </script>

```

**Request**

Has anyone got suggestions on how I can get this working? I've got requirements for a number of conditionally displayed fields. I'd prefer to not work from checkboxes as typically this client prefers to explicitly have the user click Yes or No as this is clearer to them (they feel there is no chance of ambiguity with a closed question and a yes/no choice).

This requirement of conditional fields in forms is implemented in many instances, so I know I'm not seeking the impossible. I am hoping that there's a simple refinement (or clean up) of the javascript snippet I've posted. I also welcome other JS suggested snippets too.

Thanks in advance for your help.

**ANSWER (Feb 27)**
Following the issuance of a bounty @Swati came through with a solution posted in a fiddle here: <https://jsfiddle.net/L8ke03hc/> As soon as they post the answer I'll award the Bounty. I'd like to thank Tony for coming really close and getting me on the right track. The final piece of the puzzle was the .trigger event to call the change function.

```
    <script>
        $(document).ready(function() {
          $("#id_recurring_event").change(function() {
            if ($(this).val() === "No") {
              $('#div_id_recurrence_pattern').hide();
            } else {
              $('#div_id_recurrence_pattern').show();
            }
          });
          $("#id_recurring_event").trigger("change")
        })
    </script>

```

Thanks to all that came through on this one. This was a profound learning experience for me. I really need to spend some time learning JS. That said, I've got the solution. May anyone trying to build conditional logic in Django/CrispyForms benefit from this. I am so grateful for the Open Source community! <3