'Django - display "work-in-progress/loading" after form submit until result is returned

I have a online pricing webpage where customer can input some data, then submit the form to get the price returned. How to display a "work-in-progress/loading/calculating"kind of thing temporarily before the final result (e.g. price) is calculated/returned.

below is the simplified code from my web:

Main html (post_list.html) (Note: I am using htmx to help partially update the page result)

<html>
    <body>
        <form method="POST" hx-post="{% url 'post_list' %}" hx-target="#num_1" hx-target="#num_2" hx-target="#result">
            {% csrf_token %}
            <div>
            <label>num_1:</label>
            <input type="text" name="num_1" value="" placeholder="Enter value" />
            </div>
            <div>
            <label>num_2:</label>
            <input type="text" name="num_2" value="" placeholder="Enter value" />
            </div>

            <br />
            <div id="num_1">{{ num_1 }}</div>
            <br />
            <div id="num_2">{{ num_2 }}</div>
            <br />
            <div id="result">{{ result }}</div>
            <br>
            <button type="submit">Submit</button>
        </form>
        <script src="https://unpkg.com/[email protected]"></script>
    </body>
</html>

post_list_snippet.html

<html>

    <div>
            <label>first_number:</label>
            <span id="num_1"> {{ num_1 }} </span>
    </div>

    <div>
            <label>second_number:</label>
            <span id="num_2"> {{ num_2 }} </span>
    </div>

    <div>
            <label>calculation_result:</label>
            <span id="result"> {{ result }} </span>
    </div>

</html>

view.py

def post_list(request):
    result = ""
    num1 = ""
    num2 = ""
    if request.method == "POST":
        num1 = request.POST.get('num_1')
        num2 = request.POST.get('num_2')
        result = int(num1) + int(num2)

    if request.headers.get('Hx-Request') == 'true':
        # return only the result to be replaced
        return render(request, 'blog/post_list_snippet.html', {'num_1': num1,'num_2': num2,'result': result})
    else:
        return render(request, 'blog/post_list.html', {'num_1': num1,'num_2': num2,'result': result})
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