Use Jinja2 template for Flask frontend rendering.
Pass Variables
There are two ways passing variables via Jinja2
- pass value in render_template
@index_page.route("/")
def index():
name = "jinja2"
return render_template("index.html", name = name)
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- pass a dictionary
@index_page.route("/dict")
def index_dict():
name = "jinja2"
context = {"name": name}
return render_template("index.html", **context)
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In html template
<body>
<h1>Render Template</h1>
<p>var name = {{name}}</p>
</body>
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if
in python file
@index_page.route("/template_dict")
def res_temp_dict():
data = {
"name": "Flask Using Dict",
"company": {
"name": "Facebook",
"ticker": "FB",
"price": 159.6
},
"hist": [1, 2, 3, 4, 5, 3, 2, 1]
}
return render_template("index.html", **data)
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in Jinja2 file
<p>
{% if company %}
{{ company.name }}
Ticker: {{company.ticker}}
Price: {{company.price}}
{% endif %}
</p>
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for
in Jinja2 file
<p>
{% for num in hist %}
<h1>{{num}}</h1>
{% endfor %}
</p>
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Extend Template
In Python file
@index_page.route("/extend_template")
def extend_template():
return render_template("extend_template.html")
@index_page.route("/extend_template2")
def extend_template2():
return render_template("extend_template_2.html")
@index_page.route("/extend_template/<username>")
def extend_template_username(username):
data = {
"username": username
}
return render_template("extend_template_2.html", **data)
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In Jinja2 Template
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>This is common template</title>
</head>
<body>
<h1>Template Header</h1>
{% block content %}
{% endblock %}
<h1>Template Footer</h1>
</body>
</html>
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{% extends "common/layout.html" %}
{% block content %}
<h2>Body starts here</h2>
{% endblock %}
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