Boolean Operators - Django Template Tags

Django Template Tags support boolean operators to combine or negate conditions in if statements. These operators allow more complex conditional logic directly in templates. Boolean operator are:

• and: Checks if all conditions are true.
• or: Checks if at least one condition is true.
• not: Negates the condition.

Syntax

{% if variable1 boolean_operator variable2 %}
<!-- statements -->
{% endif %}

• variable1 and variable2 can be context variables or values.
• boolean_operator can be and, or, or not.

Example:

{% if athlete_list and coach_list %}
    Both athletes and coaches are available.
{% endif %}

{% if not athlete_list %}
    There are no athletes.
{% endif %}

{% if athlete_list or coach_list %}
    There are some athletes or some coaches.
{% endif %}

{% if not athlete_list or coach_list %}
    There are no athletes or there are some coaches.
{% endif %}

{% if athlete_list and not coach_list %}
    There are some athletes but no coaches.
{% endif %}

• {% if %} tag may include one or more {% elif %} clauses to handle additional conditions.
• an optional {% else %} clause can be used to display content if all previous conditions fail.
• these clauses allow flexible control of content rendering directly in templates.

Example of Boolean Operators in Django

Consider a project named 'geeksforgeeks' having an app named 'geeks'.

In views.py

Create a view through which we will pass the context dictionary in geeks/views.py: 

from django.shortcuts import render

def geeks_view(request):
    context = {
        "data": 99,
    }
    return render(request, "geeks.html", context)

In urls.py

Create a url path to map to this view in geeks/urls.py,

from django.urls import path
from .views import geeks_view

urlpatterns = [
    path('', geeks_view),
]

In templates/geeks.html

Create a geeks.html file in templates folder of the app (geeks) if the folder already exists, if not then create the templates folder and then the geeks.html file in it:

{% if data == 99 %}
    Value in data is:- {{ data }}
{% else %}
    Data is empty
{% endif %}

Run the app using command- python manage.py runserver and visit http://127.0.0.1:8000/

Output

Common Boolean Operators in Django Templates

Django Template Tags support boolean operators that enable complex conditional logic directly in templates. Operators are:

1. == (Equal to)

Returns True if values on both side of the operator are equal.

{% if somevar == "x" %}
somevar is equal to "x"
{% endif %}

2. != (Not equal to)

Returns True if the values are not equal.

{% if somevar != "x" %}
somevar is not equal to "x"
{% endif %}

3. < (Less than)

Checks if the left value is less than the right value.

{% if somevar < 100 %}
somevar is less than 100
{% endif %}

4. > (Greater than)

Checks if the left value is greater than the right value.

{% if somevar > 0 %}
somevar is greater than 0
{% endif %}

5. <= (Less than or equal to)

Checks if the left value is less than or equal to the right value.

{% if somevar <= 100 %}
somevar is less than or equal to 100
{% endif %}

6. >= (Greater than or equal to)

Checks if the left value is greater than or equal to the right value.

{% if somevar >= 1 %}
somevar is greater than or equal to 1
{% endif %}

7. in (Contained within)

Tests if a value exists in a list, string, or QuerySet.

{% if "bc" in "abcdef" %}
  "bc" is found in "abcdef"
{% endif %}

{% if "hello" in greetings %}
  "hello" is in the greetings list or set
{% endif %}

{% if user in users %}
  user is present in the users QuerySet
{% endif %}

8. not in (Not contained within)

It's the negation (opposite) of the in operator.

{% if "z" not in "abc" %}
  "z" is not found in "abc"
{% endif %}

9. is (Object identity)

Tests if two values are the same object.

{% if somevar is True %}
  This appears if and only if somevar is True.
{% endif %}

{% if somevar is None %}
  This appears if somevar is None, or if somevar is not found in the context.
{% endif %}

10. is not (Negated object identity)

Tests if two values are not the same object

{% if somevar is not True %}
  somevar is not exactly True
{% endif %}

{% if somevar is not None %}
  somevar is not None
{% endif %}