render jinja2 template without a Flask context

Question

I have a Flask application that calls flask.render_template without problems when it is invoked from a flask http request.

I need the same

Answer 1

What I use is this code:

import jinja2
template_values = {
  'value_name_in_html': value_name_in_python,   
}

template = JINJA_ENVIRONMENT.get_template("file_patch")
self.response.write(template.render(template_values))

Answer 2

If you want to completely bypass flask and use purely Jinja for rendering your template, you can do as such

import jinja2

def render_jinja_html(template_loc,file_name,**context):

    return jinja2.Environment(
        loader=jinja2.FileSystemLoader(template_loc+'/')
    ).get_template(file_name).render(context)

And then you can call this function to render your html

Answer 3

You need to render it in an app context. Import your app in your backend code and do the following.

with app.app_context():
    data = render_template(path, **context)