So this is embarrassing. I've got an application that I threw together in Flask and for now it is just serving up a single static HTML page with some links to CSS and JS. And I can't find where in the documentation Flask describes returning static files. Yes, I could use render_template but I know the data is not templatized. I'd have thought send_file or url_for was the right thing, but I could not get those to work. In the meantime, I am opening the files, reading content, and rigging up a Response with appropriate mimetype:
import os.path
from flask import Flask, Response
app = Flask(__name__)
app.config.from_object(__name__)
def root_dir(): # pragma: no cover
return os.path.abspath(os.path.dirname(__file__))
def get_file(filename): # pragma: no cover
try:
src = os.path.join(root_dir(), filename)
# Figure out how flask returns static files
# Tried:
# - render_template
# - send_file
# This should not be so non-obvious
return open(src).read()
except IOError as exc:
return str(exc)
#app.route('/', methods=['GET'])
def metrics(): # pragma: no cover
content = get_file('jenkins_analytics.html')
return Response(content, mimetype="text/html")
#app.route('/', defaults={'path': ''})
#app.route('/<path:path>')
def get_resource(path): # pragma: no cover
mimetypes = {
".css": "text/css",
".html": "text/html",
".js": "application/javascript",
}
complete_path = os.path.join(root_dir(), path)
ext = os.path.splitext(path)[1]
mimetype = mimetypes.get(ext, "text/html")
content = get_file(complete_path)
return Response(content, mimetype=mimetype)
if __name__ == '__main__': # pragma: no cover
app.run(port=80)
Someone want to give a code sample or url for this? I know this is going to be dead simple.
In production, configure the HTTP server (Nginx, Apache, etc.) in front of your application to serve requests to /static from the static folder. A dedicated web server is very good at serving static files efficiently, although you probably won't notice a difference compared to Flask at low volumes.
Flask automatically creates a /static/<path:filename> route that will serve any filename under the static folder next to the Python module that defines your Flask app. Use url_for to link to static files: url_for('static', filename='js/analytics.js')
You can also use send_from_directory to serve files from a directory in your own route. This takes a base directory and a path, and ensures that the path is contained in the directory, which makes it safe to accept user-provided paths. This can be useful in cases where you want to check something before serving the file, such as if the logged in user has permission.
from flask import send_from_directory
#app.route('/reports/<path:path>')
def send_report(path):
return send_from_directory('reports', path)
Do not use send_file or send_static_file with a user-supplied path. This will expose you to directory traversal attacks. send_from_directory was designed to safely handle user-supplied paths under a known directory, and will raise an error if the path attempts to escape the directory.
If you are generating a file in memory without writing it to the filesystem, you can pass a BytesIO object to send_file to serve it like a file. You'll need to pass other arguments to send_file in this case since it can't infer things like the file name or content type.
If you just want to move the location of your static files, then the simplest method is to declare the paths in the constructor. In the example below, I have moved my templates and static files into a sub-folder called web.
app = Flask(__name__,
static_url_path='',
static_folder='web/static',
template_folder='web/templates')
static_url_path='' removes any preceding path from the URL (i.e.
the default /static).
static_folder='web/static' to serve any files found in the folder
web/static as static files.
template_folder='web/templates' similarly, this changes the
templates folder.
Using this method, the following URL will return a CSS file:
<link rel="stylesheet" type="text/css" href="/css/bootstrap.min.css">
And finally, here's a snap of the folder structure, where flask_server.py is the Flask instance:
You can also, and this is my favorite, set a folder as static path so that the files inside are reachable for everyone.
app = Flask(__name__, static_url_path='/static')
With that set you can use the standard HTML:
<link rel="stylesheet" type="text/css" href="/static/style.css">
I'm sure you'll find what you need there: http://flask.pocoo.org/docs/quickstart/#static-files
Basically you just need a "static" folder at the root of your package, and then you can use url_for('static', filename='foo.bar') or directly link to your files with http://example.com/static/foo.bar.
EDIT: As suggested in the comments you could directly use the '/static/foo.bar' URL path BUT url_for() overhead (performance wise) is quite low, and using it means that you'll be able to easily customise the behaviour afterwards (change the folder, change the URL path, move your static files to S3, etc).
You can use this function :
send_static_file(filename)
Function used internally to send static
files from the static folder to the browser.
app = Flask(__name__)
#app.route('/<path:path>')
def static_file(path):
return app.send_static_file(path)
What I use (and it's been working great) is a "templates" directory and a "static" directory. I place all my .html files/Flask templates inside the templates directory, and static contains CSS/JS. render_template works fine for generic html files to my knowledge, regardless of the extent at which you used Flask's templating syntax. Below is a sample call in my views.py file.
#app.route('/projects')
def projects():
return render_template("projects.html", title = 'Projects')
Just make sure you use url_for() when you do want to reference some static file in the separate static directory. You'll probably end up doing this anyways in your CSS/JS file links in html. For instance...
<script src="{{ url_for('static', filename='styles/dist/js/bootstrap.js') }}"></script>
Here's a link to the "canonical" informal Flask tutorial - lots of great tips in here to help you hit the ground running.
http://blog.miguelgrinberg.com/post/the-flask-mega-tutorial-part-i-hello-world
A simplest working example based on the other answers is the following:
from flask import Flask, request
app = Flask(__name__, static_url_path='')
#app.route('/index/')
def root():
return app.send_static_file('index.html')
if __name__ == '__main__':
app.run(debug=True)
With the HTML called index.html:
<!DOCTYPE html>
<html>
<head>
<title>Hello World!</title>
</head>
<body>
<div>
<p>
This is a test.
</p>
</div>
</body>
</html>
IMPORTANT: And index.html is in a folder called static, meaning <projectpath> has the .py file, and <projectpath>\static has the html file.
If you want the server to be visible on the network, use app.run(debug=True, host='0.0.0.0')
EDIT: For showing all files in the folder if requested, use this
#app.route('/<path:path>')
def static_file(path):
return app.send_static_file(path)
Which is essentially BlackMamba's answer, so give them an upvote.
For angular+boilerplate flow which creates next folders tree:
backend/
|
|------ui/
| |------------------build/ <--'static' folder, constructed by Grunt
| |--<proj |----vendors/ <-- angular.js and others here
| |-- folders> |----src/ <-- your js
| |----index.html <-- your SPA entrypoint
|------<proj
|------ folders>
|
|------view.py <-- Flask app here
I use following solution:
...
root = os.path.join(os.path.dirname(os.path.abspath(__file__)), "ui", "build")
#app.route('/<path:path>', methods=['GET'])
def static_proxy(path):
return send_from_directory(root, path)
#app.route('/', methods=['GET'])
def redirect_to_index():
return send_from_directory(root, 'index.html')
...
It helps to redefine 'static' folder to custom.
app = Flask(__name__, static_folder="your path to static")
If you have templates in your root directory, placing the app=Flask(name) will work if the file that contains this also is in the same location, if this file is in another location, you will have to specify the template location to enable Flask to point to the location
So I got things working (based on #user1671599 answer) and wanted to share it with you guys.
(I hope I'm doing it right since it's my first app in Python)
I did this -
Project structure:
server.py:
from server.AppStarter import AppStarter
import os
static_folder_root = os.path.join(os.path.dirname(os.path.abspath(__file__)), "client")
app = AppStarter()
app.register_routes_to_resources(static_folder_root)
app.run(__name__)
AppStarter.py:
from flask import Flask, send_from_directory
from flask_restful import Api, Resource
from server.ApiResources.TodoList import TodoList
from server.ApiResources.Todo import Todo
class AppStarter(Resource):
def __init__(self):
self._static_files_root_folder_path = '' # Default is current folder
self._app = Flask(__name__) # , static_folder='client', static_url_path='')
self._api = Api(self._app)
def _register_static_server(self, static_files_root_folder_path):
self._static_files_root_folder_path = static_files_root_folder_path
self._app.add_url_rule('/<path:file_relative_path_to_root>', 'serve_page', self._serve_page, methods=['GET'])
self._app.add_url_rule('/', 'index', self._goto_index, methods=['GET'])
def register_routes_to_resources(self, static_files_root_folder_path):
self._register_static_server(static_files_root_folder_path)
self._api.add_resource(TodoList, '/todos')
self._api.add_resource(Todo, '/todos/<todo_id>')
def _goto_index(self):
return self._serve_page("index.html")
def _serve_page(self, file_relative_path_to_root):
return send_from_directory(self._static_files_root_folder_path, file_relative_path_to_root)
def run(self, module_name):
if module_name == '__main__':
self._app.run(debug=True)
By default folder named "static" contains all static files
Here's a code sample:
<link href="{{ url_for('static', filename='vendor/bootstrap/css/bootstrap.min.css') }}" rel="stylesheet">
Use redirect and url_for
from flask import redirect, url_for
#app.route('/', methods=['GET'])
def metrics():
return redirect(url_for('static', filename='jenkins_analytics.html'))
This servers all files (css & js...) referenced in your html.
One of the simple way to do. Cheers!
demo.py
from flask import Flask, render_template
app = Flask(__name__)
#app.route("/")
def index():
return render_template("index.html")
if __name__ == '__main__':
app.run(debug = True)
Now create folder name called templates.
Add your index.html file inside of templates folder
index.html
<!DOCTYPE html>
<html>
<head>
<title>Python Web Application</title>
</head>
<body>
<div>
<p>
Welcomes You!!
</p>
</div>
</body>
</html>
Project Structure
-demo.py
-templates/index.html
The issue I had was related to index.html files not being served for directories when using static_url_path and static_folder.
Here's my solution:
import os
from flask import Flask, send_from_directory
from flask.helpers import safe_join
app = Flask(__name__)
static = safe_join(os.path.dirname(__file__), 'static')
#app.route('/')
def _home():
return send_from_directory(static, 'index.html')
#app.route('/<path:path>')
def _static(path):
if os.path.isdir(safe_join(static, path)):
path = os.path.join(path, 'index.html')
return send_from_directory(static, path)
Thought of sharing.... this example.
from flask import Flask
app = Flask(__name__)
#app.route('/loading/')
def hello_world():
data = open('sample.html').read()
return data
if __name__ == '__main__':
app.run(host='0.0.0.0')
This works better and simple.
All the answers are good but what worked well for me is just using the simple function send_file from Flask. This works well when you just need to send an html file as response when host:port/ApiName will show the output of the file in browser
#app.route('/ApiName')
def ApiFunc():
try:
return send_file('some-other-directory-than-root/your-file.extension')
except Exception as e:
logging.info(e.args[0])```
The simplest way is create a static folder inside the main project folder. Static folder containing .css files.
main folder
/Main Folder
/Main Folder/templates/foo.html
/Main Folder/static/foo.css
/Main Folder/application.py(flask script)
Image of main folder containing static and templates folders and flask script
flask
from flask import Flask, render_template
app = Flask(__name__)
#app.route("/")
def login():
return render_template("login.html")
html (layout)
<!DOCTYPE html>
<html>
<head>
<title>Project(1)</title>
<link rel="stylesheet" href="/static/styles.css">
</head>
<body>
<header>
<div class="container">
<nav>
<a class="title" href="">Kamook</a>
<a class="text" href="">Sign Up</a>
<a class="text" href="">Log In</a>
</nav>
</div>
</header>
{% block body %}
{% endblock %}
</body>
</html>
html
{% extends "layout.html" %}
{% block body %}
<div class="col">
<input type="text" name="username" placeholder="Username" required>
<input type="password" name="password" placeholder="Password" required>
<input type="submit" value="Login">
</div>
{% endblock %}
The URL for a static file can be created using the static endpoint as following:
url_for('static', filename = 'name_of_file')
<link rel="stylesheet" href="{{url_for('static', filename='borders.css')}}" />
By default, flask use a "templates" folder to contain all your template files(any plain-text file, but usually .html or some kind of template language such as jinja2 ) & a "static" folder to contain all your static files(i.e. .js .css and your images).
In your routes, u can use render_template() to render a template file (as I say above, by default it is placed in the templates folder) as the response for your request. And in the template file (it's usually a .html-like file), u may use some .js and/or `.css' files, so I guess your question is how u link these static files to the current template file.
If you are just trying to open a file, you could use app.open_resource(). So reading a file would look something like
with app.open_resource('/static/path/yourfile'):
#code to read the file and do something
In the static directory, create templates directory inside that directory add all the html file create separate directory for css and javascript as flask will treat or recognize all the html files which are inside the template directory.
static -
|_ templates
|_ css
|_javascript
|_images
This is what worked for me:
import os
from flask import Flask, render_template, send_from_directory
app = Flask(__name__)
root = os.path.join(os.path.dirname(os.path.abspath(__file__)), "whereyourfilesare")
#app.route('/', methods=['GET'])
def main(request):
path = request.path
if (path == '/'):
return send_from_directory(root, 'index.html')
else:
return send_from_directory(root, path[1:])
In my case, i needed all the files from a static folder to be accessible by the user, as well as i needed to use templates for some of my html files, so that common html code could be placed in the template and code gets reused. Here is how i achieved both of them together:
from flask import Flask, request, render_template
from flask.json import JSONEncoder
app = Flask(__name__, template_folder='static')
#app.route('/<path:path>')
def serve_static_file(path):
# In my case, only html files are having the template code inside them, like include.
if path.endswith('.html'):
return render_template(path)
# Serve all other files from the static folder directly.
return app.send_static_file(path)
And all of my files are kept under static folder, which is parallel to main flask file.
For example, to return an Adsense file I have used:
#app.route('/ads.txt')
def send_adstxt():
return send_from_directory(app.static_folder, 'ads.txt')
I created a website with HTML/CSS. I also used Javascript for events (click on button, ...).
Now I want to connect a Python script with it and more importantly, return the results from my Python functions to my website and display (use) them there.
Consider something like this: I have a website with an input field and a button. If you click on the button, a Python script should run which returns if the input is an odd or even number (of course you don't need Python for this specific case, but that's what I want to do).
From my research I believe Flask is the library to be used for this, but I really don't know how to do it. I found very few examples. I would really appreciate if someone could implement the above example or tell me how to do it exactly.
I know there are already some questions about that concept here online, but as I said, with very few examples.
You're right about Flask being a good solution for this and there are examples and tutorials everywhere. If what you want is just to run a specific function on a button press and get something back in javascript, I've put a quick example is below.
# app.py
from flask import Flask, render_template
from flask import jsonify
app = Flask(__name__)
# Display your index page
#app.route("/")
def index():
return render_template('index.html')
# A function to add two numbers
#app.route("/add")
def add():
a = request.args.get('a')
b = request.args.get('b')
return jsonify({"result": a+b})
if __name__ == "__main__":
app.run(host='0.0.0.0', port=80)
This can then be run with python app.py and make sure your index.html is in the same directory. Then you should be able to go to http://127.0.0.1/ and see your page load.
This implements a function which adds two numbers, this can be called in your javascript by calling http://127.0.0.1/add?a=10&b=20. This should then return {"result": 30}.
You can grab this in your javascript using the code below and place this code in your buttons on click callback.
let first = 10;
let second = 20;
fetch('http://127.0.0.1/add?a='+first+'&b='+second)
.then((response) => {
return response.json();
})
.then((myJson) => {
console.log("When I add "+first+" and "+second+" I get: " + myJson.result);
});
This should be the barebone basics, but once you can submit data to Flask and get data back, you now have an interface to run things in Python.
Edit: Full Front-end example
https://jsfiddle.net/4bv805L6/
I really appreciate time spent on this answer. But the answer did not help me in the way I needed it. At that point I had no clue what to do, but since thenbI figured it out some time ago and I thought I should share my solution here:
That's app.py:
from flask import Flask, render_template, request
app = Flask(__name__)
#app.route('/stick', methods=['GET', 'POST'])
def stick():
if request.method == 'POST':
result = request.form['string1'] + request.form['string2']
return render_template('index.html', result=result)
else:
return render_template('index.html')
if __name__ == "__main__":
app.run()
And that's index.html (put in the folder templates):
<!DOCTYPE html>
<html>
<body>
<h3> Stick two strings </h3>
<form action="{{ url_for('stick') }}" method="post">
<input type="text" name="string1">
<input type="text" name="string2">
<input type="submit" value="Go!">
<p id="result"></p>
</form>
<script>
document.getElementById("result").innerHTML = "{{result}}"
</script>
</body>
</html>
In the terminal, type in python app.py and it should work.
So I have a simple Django script which I've found online for an AJAX function that runs a Python script and gets the output via stdout.
views.py
from django.shortcuts import render
def index(request):
return render(request,'homepage/page.html')
homepage/page.html
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8">
<title>test</title>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js"></script>
<script type="text/javascript">
$(function()
{
$('#clickme').click(function(){
alert('Im going to start processing');
$.ajax({
url: "static/homepage/js/external_func.py",
type: "POST",
datatype:"json",
data: {'key':'value','key2':'value2'},
success: function(response){
console.log(response.keys);
console.log(response.message);
}
});
});
});
</script>
</head>
<body>
<button id="clickme"> click me </button>
</body>
</html>
So you can see my url is linked to external_func.py which runs after the button is clicked. The script then returns a json.
external_func.py
import sys
import json
import cgi
fs = cgi.FieldStorage()
sys.stdout.write("Content-Type: application/json")
sys.stdout.write("\n")
sys.stdout.write("\n")
result = {}
result['success'] = True
result['message'] = "The command Completed Successfully"
result['keys'] = ",".join(fs.keys())
d = {}
for k in fs.keys():
d[k] = fs.getvalue(k)
result['data'] = d
sys.stdout.write(json.dumps(result, indent=1))
sys.stdout.write("\n")
sys.stdout.close()
However, when I run the server and clicked on the button, the console shows undefined for both values, meaning response.keys and response.message is undefined.
Now, when I instead switch the code to console.log(response) in homepage/page.html. The console prints out the entire external_func.py code in text.
I couldn't find a solution online. It seems like people rarely calls a Python script in an AJAX request, I see a lot of forum posts about AJAX calling for a php code instead.
EDIT1:
I have to clarify one thing. This is just a small section of my project which I want to run some test on. In my actual project, I will have a function in python that takes a long time to compute, hence I prefer to have a webpage partially rendered with a waiting icon while the function processes. The output from the function will then be displayed on a webpage.
You have a django app, and yet you are using CGI for this function? Why? Why not simply make the function another django view? Serving your response with django is much superior to CGI, unless that function significantly bloats or slows down your django. It is as easy as this:
from django.http import JsonResponse
def func(request):
result = ...
return JsonResponse(result)
If you really want to separate this into a CGI script, the most likely reason you are failing to get a response is your web server not being configured to process the CGI request. (Your Developer Tools Network tab is a great help for diagnosing exactly what kind of response you got.) For security reasons CGI is not enabled by default. You need to tell Apache (or whatever web server you are using) that CGI should be enabled for that directory, and that it should be associated with .py files.
I am using Dropzone.js to allow drag and drop upload of CSV files via a Flask web site. The upload process works great. I save the uploaded file to my specified folder and can then use df.to_html() to convert the dataframe into HTML code, which I then pass to my template. It gets to that point in the code, but it doesn't render the template and no errors are thrown. So my question is why is Dropzone.js preventing the render from happening?
I have also tried just return the HTML code from the table and not using render_template, but this also does not work.
init.py
import os
from flask import Flask, render_template, request
import pandas as pd
app = Flask(__name__)
# get the current folder
APP_ROOT = os.path.dirname(os.path.abspath(__file__))
#app.route('/')
def index():
return render_template('upload1.html')
#app.route('/upload', methods=['POST'])
def upload():
# set the target save path
target = os.path.join(APP_ROOT, 'uploads/')
# loop over files since we allow multiple files
for file in request.files.getlist("file"):
# get the filename
filename = file.filename
# combine filename and path
destination = "/".join([target, filename])
# save the file
file.save(destination)
#upload the file
df = pd.read_csv(destination)
table += df.to_html()
return render_template('complete.html', table=table)
if __name__ == '__main__':
app.run(port=4555, debug=True)
upload1.html
<!DOCTYPE html>
<meta charset="utf-8">
<script src="https://rawgit.com/enyo/dropzone/master/dist/dropzone.js"></script>
<link rel="stylesheet" href="https://rawgit.com/enyo/dropzone/master/dist/dropzone.css">
<table width="500">
<tr>
<td>
<form action="{{ url_for('upload') }}", method="POST" class="dropzone"></form>
</td>
</tr>
</table>
EDIT
Here is the sample csv data I am uploading:
Person,Count
A,10
B,12
C,13
Complete.html
<html>
<body>
{{table | safe }}
</body>
</html>
Update: Now you can use Flask-Dropzone, a Flask extension that integrates Dropzone.js with Flask. For this issue, you can set DROPZONE_REDIRECT_VIEW to the view you want to redirect when uploading complete.
Dropzone.js use AJAX to post data, that's why it will not give back the control to your view function.
There are two methods to redirect (or render template) when all files were complete uploading.
You can add a button to redirect.
Upload Complete
You can add an event listener to automatic redirect page (use jQuery).
<script>
Dropzone.autoDiscover = false;
$(function() {
var myDropzone = new Dropzone("#my-dropzone");
myDropzone.on("queuecomplete", function(file) {
// Called when all files in the queue finish uploading.
window.location = "{{ url_for('upload') }}";
});
})
</script>
In view function, add an if statement to check whether the HTTP method was POST:
import os
from flask import Flask, render_template, request
app = Flask(__name__)
app.config['UPLOADED_PATH'] = 'the/path/to/upload'
#app.route('/')
def index():
# render upload page
return render_template('index.html')
#app.route('/upload', methods=['GET', 'POST'])
def upload():
if request.method == 'POST':
for f in request.files.getlist('file'):
f.save(os.path.join('the/path/to/upload', f.filename))
return render_template('your template to render')
Your code does work. Your template will be rendered and returned.
Dropzone will upload files you drag and drop into your browser 'in the background'.
It will consume the response from the server and leave the page as is. It uses the response from the server to know if the upload was successful.
To see this in action:
Navigate to your page
Open up your favourite browser dev tools; (in firefox press CTRL+SHIFT+K)
Select the network tab
Drag your csv into the dropzone pane and note that the request shows in the dev tools network table
Here is a screen shot from my browser. I copied your code as is from your question.
To actually see the rendered complete.html you will need to add another flask endpoint and have a way to navigate to that.
For example:
in upload1.html add:
Click here when you have finished uploading
in init.py change and add:
def upload():
...
# you do not need to read_csv in upload()
#upload the file
#df = pd.read_csv(destination)
#table += df.to_html()
return "OK"
# simply returning HTTP 200 is enough for dropzone to treat it as successful
# return render_template('complete.html', table=table)
# add the new upload_complete endpoint
# this is for example only, it is not suitable for production use
#app.route('/upload-complete')
def upload_complete():
target = os.path.join(APP_ROOT, 'uploads/')
table=""
for file_name in os.listdir(target):
df = pd.read_csv(file_name)
table += df.to_html()
return render_template('complete.html', table=table)
If you are using Flask-Dropzone then:
{{ dropzone.config(redirect_url=url_for('endpoint',foo=bar)) }}