It seems like the 'with' tag is not working if it is declared outside of a block as this:
{% extends 'base.html' %}
{% with my_var=1 %}
{% block test1 %}
{{my_var}}
{% endblock %}
{% block test2 %}
{{my_var}}
{% endblock %}
{% endwith %}
The template above simply displays nothing since my_var is NOT passed inside those blocks. How can I overcome this?
I came to Django from using Tornado with Jinja2 and I was being driven insane by the inability to set variables that (a) could be defined in the template (not view) and (b) would be available in the base template that this derives from. Looking at a little four-line piece of code from django-libs, I was able to rig up something like this that worked well. Here is an example of a title string that should appear in various blocks.
settings.py -- add to TEMPLATES (Django 1.10+)
TEMPLATES = {
...
builtins = ['mysite...wherever...templatetags',]
}
mysite.whereever.templatetags.py
from django import template
register = template.Library()
@register.simple_tag(takes_context=True)
def setvar(context, key, value):
context.dicts[0][key] = value
return ''
base.html
{% block settings %}
{% comment %}
Put this at the TOP of the template before
any blocks that use variables.
{% endcomment %}
{% endblock settings %}
<html>
<head><title>{{title}}</title></head>
<body><h1>My Site: {{title}}</h1>
{% block body %}
{% endblock body %}
</body></html>
menu.html -- a template that does not set 'title' in views:
{% extends "base.html" %}
{% block settings %}
{{ block.super }} {% comment %}optional{% endcomment %}
{% setvar 'title' 'Menu' %}
{% endblock %}
{% block body %}
<ul><li>Fish</li><li>Steak</li></ul>
{% endblock %}
Now the title will appear in two places in the HTML even though it is defined in the derived template but appears in the top template.
Based on @MichaelScottAsatoCuthbert 's solution,
on top of templates/base.html:
{% block settings %}{% endblock %}
<!doctype html>
...
usage in page_template.html:
{% extends base.html %}
{% block settings %}
{% setcontext title %}
{% trans "I'm a translated title" %}
{% endsetcontext %}
{% endblock %}
templatetags/setcontext.py:
from django import template
register = template.Library()
@register.tag(name="setcontext")
def do_setcontext(parser, token):
nodelist = parser.parse(("endsetcontext",))
params = token.split_contents()
if len(params) != 2:
raise template.TemplateSyntaxError(
"'setcontext' tag requires exactly one argument")
key = params[1]
parser.delete_first_token()
return SetContextNode(nodelist, key)
class SetContextNode(template.Node):
def __init__(self, nodelist, key):
self.nodelist = nodelist
self.key = key
def render(self, context):
context.dicts[0][self.key] = self.nodelist.render(context).strip()
return ''
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blockthe reason. Can you just verifying by seeing if{% block test1 %}{% with my_var1=1 %}{{my_var1}}{% endwith %}{% endblock %}works ? – Decelerate