2. Custom Render Template

"It will help us to append necessary values like sid in render template"

In Flask, the render_template function is commonly used to render HTML templates. However, if you want to extend its functionality, you can create a custom rendering function. This can be useful if you need to preprocess data, add custom context processors, or manipulate templates in a unique way before rendering them.

Here's a simple example of creating a custom render template function in Flask:

Example of a Custom Render Template Function

Basic Setup: First, set up your Flask application and directory structure.

/my_flask_app
├── app.py
├── templates
│   ├── base.html
│   └── index.html
└── custom_render.py

Creating the Custom Render Function:

In custom_render.py, define the custom render function.

from flask import render_template
import datetime

def custom_render_template(template_name, **context):
    # Add custom context variables
    context['current_year'] = datetime.datetime.now().year
    
    # You can add more custom logic here
    
    # Render the template with the updated context
    return render_template(template_name, **context)

Using the Custom Render Function in Your Flask App:

In app.py, use the custom render function instead of the default render_template.

from flask import Flask
from custom_render import custom_render_template

app = Flask(__name__)

@app.route('/')
def home():
    return custom_render_template('index.html', title='Home Page')

if __name__ == '__main__':
    app.run(debug=True)

Creating the Templates:

In the templates directory, create a base.html and index.html.

base.html:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>{{ title }}</title>
</head>
<body>
    <header>
        <h1>Welcome to My Website</h1>
        <p>Current Year: {{ current_year }}</p>
    </header>
    <div data-gb-custom-block data-tag="block"></div>

</body>
</html>

index.html:

{% extends "base.html" %}

{% block content %}
    <h2>This is the Home Page</h2>
{% endblock %}

Explanation

custom_render_template Function: This function wraps around Flask's render_template and adds additional context variables (current_year in this example). You can extend this function to include more complex preprocessing or custom context handling as needed.
Using the Custom Function: In app.py, the route handler for / calls custom_render_template instead of the default render_template. This allows you to take advantage of the additional context variables or preprocessing logic you've added in your custom function.
Templates: The templates are structured normally, but they now receive the additional context variable (current_year) provided by the custom render function.

This approach allows for greater flexibility and can be particularly useful in larger applications where you need consistent context variables or preprocessing across many templates.

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Last updated 1 year ago