Django if-else: Conditional Statements in Templates

Introduction

Django provides a powerful template language that includes conditional statements. With the use of if-else statements, you can control the flow of your templates based on specific conditions. In this guide, we will explore how to use if-else statements in Django templates with examples.

Step 1: Basic if-else Statement

The if-else statement allows you to execute different blocks of code based on a condition. Here's an example:

{% if condition %}
    <p>Condition is true</p>
{% else %}
    <p>Condition is false</p>
{% endif %}
    

In this example, we use the {% if %} tag to check a condition. If the condition is true, the code inside the {% if %} block will be executed. Otherwise, the code inside the {% else %} block will be executed. In this case, we output different messages based on whether the condition is true or false.

Step 2: Checking Equality

You can use the if-else statement to check for equality between variables or compare values. Here's an example:

{% if name == "John" %}
    <p>Hello, John!</p>
{% else %}
    <p>Hello, stranger!</p>
{% endif %}
    

In this example, we compare the value of the variable name with the string "John". If the condition is true, we output a personalized greeting for John. Otherwise, we output a generic greeting for other names.

Step 3: Multiple Conditions

You can combine multiple conditions using logical operators such as and and or. Here's an example:

{% if age >= 18 and nationality == "US" %}
    <p>You are eligible to vote in the US.</p>
{% elif age >= 18 and nationality == "UK" %}
    <p>You are eligible to vote in the UK.</p>
{% else %}
    <p>You are not eligible to vote.</p>
{% endif %}
    

In this example, we check two conditions: the age is greater than or equal to 18 and the nationality is either "US" or "UK". Based on the combination of conditions, we output different messages regarding voting eligibility.

Conclusion

Using if-else statements in Django templates allows you to implement conditional logic and control the flow of your templates based on specific conditions. By following this guide, you have learned how to use if-else statements in Django templates, check for equality, handle multiple conditions, and personalize the output based on different scenarios. With the power of if-else statements, you can create dynamic and interactive templates in your Django web applications.