Jinja has multiple ways to control whitespace. It does not have a way to prettify output, you have to manually make sure everything looks “nice”. The broadest solution is to set trim_blocks and lstrip_blocks on the env. app.jinja_env.trim_blocks = True app.jinja_env.lstrip_blocks = True If you want to keep a newline at the end of the … Read more
Just pass items to template.render as a keyword argument – it should be a list (really any iterable will do) of items. If you need sub-items use a class or a dictionary. In the simplest case, you can use a dictionary: items = [] for i in range(1, 11): i = str(i) # dict == … Read more
Data: parent_list = [{‘A’: ‘val1’, ‘B’: ‘val2’}, {‘C’: ‘val3’, ‘D’: ‘val4’}] in Jinja2 iteration: {% for dict_item in parent_list %} {% for key, value in dict_item.items() %} <h1>Key: {{key}}</h1> <h2>Value: {{value}}</h2> {% endfor %} {% endfor %} Note: Make sure you have the list of dict items. If you get UnicodeError may be the value … Read more
<span>You have {{products|length}} products</span> You can also use this syntax in expressions like {% if products|length > 1 %} jinja2’s builtin filters are documented here; and specifically, as you’ve already found, length (and its synonym count) is documented to: Return the number of items of a sequence or mapping. So, again as you’ve found, {{products|count}} … Read more
Modify the jinja2.Environment global namespace itself if you see fit. import jinja2 env = jinja2.Environment() env.globals.update(zip=zip) # use env to load template(s) This may be helpful in separating view (template) logic from application logic, but it enables the reverse as well. #separationofconcerns
Any arguments that don’t match route parameters will be added as the query string. Assuming extra_args is a dict, just unpack it. extra_args = {‘hello’: ‘world’} url_for(‘doit’, oid=oid, **extra_args) # /doit/123?hello=world url_for(‘doit’, oid=oid, hello=’davidism’) # /doit/123?hello=davidism Then access them in the view with request.args: @app.route(‘/doit/<int:oid>’) def doit(oid) hello = request.args.get(‘hello’) …
If you absolutely need to store the image in the database, then yes, this is correct. Typically, files are stored in the filesystem and the path is stored in the database. This is the better solution because the web server typically has an efficient method of serving files from the filesystem, as opposed to the … Read more
Using an Ajax request Python @app.route(‘/_stuff’, methods= [‘GET’]) def stuff(): cpu=round(getCpuLoad()) ram=round(getVmem()) disk=round(getDisk()) return jsonify(cpu=cpu, ram=ram, disk=disk) Javascript function update_values() { $SCRIPT_ROOT = {{ request.script_root|tojson|safe }}; $.getJSON($SCRIPT_ROOT+”/_stuff”, function(data) { $(“#cpuload”).text(data.cpu+” %”) $(“#ram”).text(data.ram+” %”) $(“#disk”).text(data.disk+” %”) }); } Using Websockets project/app/views/request/websockets.py # -*- coding: utf-8 -*- # OS Imports import json # Local Imports from app … Read more
Basically, jinja2 is only concerned with finding an evaluating its own blocks, not the structure of the HTML. If you want to exclude a section of your template entirely, you can use jinja2’s comment syntax: {# This is a comment now. <div class=”control-group”> … </div> #}