Reading radio button value inside template

Using Django Getting Started
1

Hi all,

Beginner here. I have the following view code snippet for a test project :

def index(request):
    template = loader.get_template("cars/index.html")
    filter = request.POST.get("filter", "id_none")
    context = {
        "list_cars": CarBrand.objects.all(),
        "filter_list_colors": CarColor.objects.all(),
        "filter": filter
    }
    return HttpResponse(template.render(context, request))

And the related template part (inside a form):

{% for color in filter_list_colors %}
<input type="radio" id= "id_color{{color.id}}" name="filter" value="val_color{{color.id}}"
	{% if filter == "???" %} checked {% endif %}>
	<label for="id_color{{color.id}}">{{color.color_name}}</label>
	<br/>
{% endfor %}

My question is, what to use in place of the "???" above ? I want to say: “If context variable filter is matching this radio button’s value, set it to checked”.

2

So, you will need to compare the filter context variable with the value of the radio button in your template.
Try something like this:

{% for color in filter_list_colors %}
    <input type="radio" id="id_color{{ color.id }}" name="filter" value="val_color{{ color.id }}"
        {% if filter == "val_color{{ color.id }}" %} checked {% endif %}>
    <label for="id_color{{ color.id }}">{{ color.color_name }}</label>
    <br/>
{% endfor %}

`