Templates
Jinja Includes
Using Includes
Jinja includes embed reusable snippets with {% include %}.
Introduction to Jinja Includes
Jinja includes are a powerful feature of the Jinja templating engine that allow you to embed reusable snippets in your templates using the {% include %} statement. This can help you avoid code duplication and keep your templates organized.
By using includes, you can break down complex templates into smaller, manageable pieces and include them wherever needed in your application.
Basic Usage of {% include %}
The {% include %} statement is used to include an external template file within another template. This is useful for embedding repetitive elements, such as headers, footers, or navigation bars, into multiple pages.
Here is a basic example of how to use the {% include %} statement:
In the example above, the header.html and footer.html files are included in the main base.html template. This approach ensures that any changes to the header or footer only need to be made in one place, simplifying maintenance.
Passing Variables to Included Templates
You can pass variables to the included templates by defining them in the context of the parent template. Variables available in the parent template will also be accessible in the included template.
Consider the following example:
In this scenario, if the user_name variable is defined in the context where base.html is rendered, it will be accessible within the welcome.html template.
Handling Missing Includes
By default, Jinja will raise an error if an included template file is missing. However, you can handle missing includes gracefully using the ignore missing option.
Here's an example:
With ignore missing, Jinja will not raise an error if optional.html does not exist, allowing your application to continue running smoothly.
Conclusion
Jinja includes offer a straightforward way to manage and reuse template code, making your web applications more modular and maintainable. By using {% include %}, you can keep your templates clean and DRY (Don't Repeat Yourself), saving time and reducing the likelihood of errors.
