Jinja Template Stuff

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Also see - Flask Stuff


References

Questions and Explanations

Examples

    {% for link in links %}

            <li><a href="{{ link }}">{{ link }}</a></li>

    {% endfor %}
Number of links is: {{ links|length }}
{% set myvar = "David" %}
My variables: {{ myvar }}
{% for link in links %}
    {{ myvar }}
    {% set myvar = 'Changed' %}
{% endfor %}
{{ myvar }}


<img src="Template:Url for('static', filename = 'css/images/icons/resultset previous.png')" width="16" height="16" alt="previous" title="Previous" border="0">


def tech_pro(name='Tech.Pro'):
    return render_template('message.html', **locals())


def tech_pro(name='Tech.Pro'):
    links = get_links()
    return render_template('message.html', **locals())


def get_links():
    links = ['http://www.tech.pro/article1',
             'http://www.tech.pro/article2',
             'http://www.tech.pro/article3']
    return links


<p>
<h3>My Articles:</h3>

<ul>
    {% for link in links %}

            <li><a href="{{ link }}">{{ link }}</a></li>

    {% endfor %}
</ul>
</p>

A More Complete Example

import os
from flask import Flask
from jinja2 import Environment, FileSystemLoader
from random import randint

# Start the Flask application
app = Flask(__name__)

# Define the template directory
tpldir = os.path.dirname(os.path.abspath(__file__))+'/templates/'

# Setup the template enviroment
env = Environment(loader=FileSystemLoader(tpldir), trim_blocks=True)

# Define a route for the webserver
@app.route('/')
def index():
  
  # define a random skill level
  skill_level = randint(0,100)
      
  # generate template and assign variables
  output = env.get_template('example.html').render(
    skill_level=skill_level
  )
  
  # return the output
  return output

# Listen to port 80
if __name__ == '__main__':
	app.run( 
        host="0.0.0.0",
        port=int("80")
  )
<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title></title>
  <meta name="description" content="Using `if` statements in templates [Python, Flask and Jinja2]">
  <meta name="author" content="Richard Ruiter">
</head>
<body>

  <h1>Your skill level is:</h1>
  
  <p>
  {% if skill_level >= 0 and skill_level < 25 %}
    Beginner
  {% elif skill_level >= 25 and skill_level < 50 %}
    Intermediate
  {% elif skill_level >= 50 and skill_level < 75 %}
    Advanced
  {% else %}
    Expert
  {% endif %}
  </p>
  
</body>
</html>

Zip

you need zip() but it isn't defined in jinja2 templates.

one solution is zipping it before render_template function is called, like:

view function:

return render_template('form_result.html',type=type,reqIDs_msgs_rcs=zip(IDs,msgs,rcs))

template:

{% for reqID,msg,rc in reqIDs_msgs_rcs %}
<h1>ID - {{ID}}</h1>
{% if rc %}
<h1>Status - {{msg}}!</h1>
{% else %}
<h1> Failed </h1>
{% endif %}
{% endfor %}

also, you can add zip to jinja2 template global, using Flask.add_template_x functions(or Flask.template_x decorators)

@app.template_global(name='zip')
def _zip(*args, **kwargs): #to not overwrite builtin zip in globals
    return __builtins__.zip(*args, **kwargs)