Is there a way to pass variables into Jinja2 parents?
Question
I'm trying to pass some variables from the child page to the template. This is my python code:
if self.request.url.find("&try") == 1:
isTrying = False
else:
isTrying = True
page_values = {
"trying": isTrying
}
page = jinja_environment.get_template("p/index.html")
self.response.out.write(page.render(page_values))
The template:
<html>
<head>
<link type="text/css" rel="stylesheet" href="/css/template.css"></link>
<title>{{ title }} | SST QA</title>
<script src="/js/jquery.min.js"></script>
{% block head %}{% endblock head %}
</head>
<body>
{% if not trying %}
<script type="text/javascript">
// Redirects user to maintainence page
window.location.href = "construct"
</script>
{% endif %}
{% block content %}{% endblock content %}
</body>
</html>
and the child:
{% extends "/templates/template.html" %}
{% set title = "Welcome" %}
{% block head %}
{% endblock head %}
{% block content %}
{% endblock content %}
The problem is, I want to pass the variable "trying" into the parent, is there a way to do this?
Thanks in advance!
4 answers
solution1
20 2014-03-22 19:52:01
The example on the Jinja2 Tips and Tricks page explains this perfectly, http://jinja.pocoo.org/docs/templates/#base-template . Essentially, if you have a base template
**base.html**
<html>
<head>
<title> MegaCorp -{% block title %}{% endblock %}</title>
</head>
<body>
<div id="content">{% block content %}{% endblock %}</div>
</body>
</html>
and a child template
**child.html**
{% extends "base.html" %}
{% block title %} Home page {% endblock %}
{% block content %}
... stuff here
{% endblock %}
whatever python function calls render_template("child.html") will return the html page
**Rendered Page**
<html>
<head>
<title> MegaCorp - Home page </title>
</head>
<body>
<div id="content">
stuff here...
</div>
</body>
</html>
solution2
7 2020-05-24 05:59:39
I think that you are looking to highlight active menus in the base layout and you need something like this
{% extends 'base.html' %}
{% set active = "clients" %}
then use can use "active" inside base.html
solution3
4 2021-03-09 18:20:25
You just need to declare that variable before extending the template, so the extended template will have access to to the variable trying
{% set trying = True %} <----------- declare variable
{% extends "/templates/template.html" %}
{% set title = "Welcome" %}
{% block head %}
{% endblock head %}
{% block content %}
{% endblock content %}
Few years later but hoping it may help latecomers
solution4
2 ACCPTED 2013-01-10 13:05:49
I do not understand your problem. When you pass variables to the context (as you do with trying) these variables will be available in the child and the parent. To pass title to the parent, you have to use inheritance, sometimes in combination with super: http://jinja.pocoo.org/docs/templates/#super-blocks
See also this question: Overriding app engine template block inside an if
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