Jinja Inline if and Loop Filtering
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The Jinja2 templating engine offers two powerful ways to handle conditional logic compactly: the **inline if statement** and **loop filtering**. Both methods make your templates cleaner and easier to read by avoiding multi-line if blocks.
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Inline if Statement
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This acts as a ternary operator, providing a concise way to choose between two values based on a single condition. It’s great for displaying a simple message or assigning a variable.
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{# Display a user's status directly #}nThe user’s status is: {{ ‘Logged In’ if user.authenticated else ‘Guest’ }}n
n{# Set a variable based on a condition #} {% set stock_status = ‘In Stock’ if product.in_stock else ‘Out of Stock’ %}n
nThis product is {{ stock_status }}.n
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Filtering with if in Loops
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You can use an if condition directly within a `for` loop to iterate over only the items that meet a specific requirement. This is an elegant way to filter data without writing a separate if block inside your loop.
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{# Only loop over featured products #}n
Featured Products
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- {% for product in products if product.featured %}n
- {{ product.name }}
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n{% endfor %}n
n{# Only display items with a count greater than zero #}n
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Available Items
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- {% for item in inventory if item.count > 0 %}n
- {{ item.name }} ({{ item.count }} left)
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n{% endfor %}n
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