Category archives: Flask refresh page

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Sign in to your account. Why doesn't flask reload when I change my code? It should automatically reload my app Is flask-script now obsolete in 0. Now that since I've been wanting to upgrade to newer flask version 0.

I'm a bit confused on why this is happening Also I believe there is something holding back flask from actually being able to auto reload when any part of my code base changes It doesn't automatically reload anymore Is there something I can do about this in my development environment? Also because of this change Will this affect how uwsgi is implemented with supervisor?

If so could you please point out where are the changes? In addition could you please let me know if application factory pattern of designing larger apps still work? Or what sort of modifications were made to this patter? Also I believe there is something holding back flask from actually being able to auto reload when any part of my code base changes.

This would be an actual bug, but you still haven't described which exact steps you take, such that I can reproduce your issue. There's a bunch of unrelated questions you additionally asked which I can't all answer. I have no experience with uwsgi, however I can't imagine that configuration with uwsgi changes. The app factory pattern also still works. You would create a separate module that calls your factory at import time. We're looking at improving this experience.

In the future please ask those questions in the IRC channel or on stackoverflow. This is a bugtracker. Let's focus on the bug you reported. Nothing has changed about the application factory pattern or about how you would run a Flask app with uWSGI.

flask refresh page

Nothing should have changed about the reloader, either. Please include a minimal, complete, and verifiable example when reporting a bug. Was it 0. X or earlier? And by code, do you mean the. If it's the html templatesthen is this problem the same as which was fixed in ? If I edit test. In my case, my template directory and static directory are custom locations that I am pointing to when I initialize my flask app.

When I change either the template or the source files, the app fails to reload correctly.This post is about creating Python Flask web pages that can be asynchronously updated by your Python Flask application at any point without any user interaction.

Asynchronous updates to a webpage with Flask and

The working application is hosted on GitHub. What I want to achieve here is a web page that is automatically updated for each user as a result of events that happened in the background on my server system. In this post, I show how to develop a bare-bones Python Flask application that updates connected clients with random numbers. Flask is an extremely lightweight and simple framework for building web applications using Python. Gone are the days of static HTML pages that load when you visit; with Socket technology, the server can continuously update your view with new information.

For Socket. Implementing event triggers or binding event callbacks are very simply implemented in Flask after some initial setup using:. Four events are allowed in the socketio. I would really recommend the JavaScript path on CodeSchool if you are not familiar with these technologies. And that, effectively, is the bones of sending messages between client and server. Hence, in application. In our main Flask code then, we start this RandomThead running, and then catch the emitted numbers in Javascript on the client.

Client presentation is done, for this example, using a simple bootstrap themed page contained in the Flask Template folder, and the number handling logic is maintained in the static JavaScript file application. A running list of 10 numbers is maintained and all connected clients will update simultaneously as new numbers are generated by the server.

Flask served web pages that react to events on the server. Perhaps in part2. The final output should look like this:. You can find all of the source code on GitHubwith instructions on how to install the necessary libraries etc. Feel free to adapt to your own needs, and leave any comments if you come up with something neat or have any problems.

This functionality is documented in the original documentation for Flask-SocketIO. The documentation and tutorials are quite comprehensive and worth working through if you are interested in more. Why is it only within the console are the random numbers being generated, but nothing on the browser after.

Or simply updating it within the same TextField, similar to how real time stock quotes are displayed? Install eventlet or gevent and gevent-websocket for improved performance. Hi guys, I think some version issues are affecting this. Can you try putting in the following code and see if it works at the top of the file:.

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Hi guys, download the jquery and socketio files and put this in static directory. And, monkey. My bad, I found the eventlet module and applied this to the application. Running python 3.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information.

I'm investigating how to develop a decent web app with Python. Since I don't want some high-order structures to get in my way, my choice fell on the lightweight Flask framework. Time will tell if this was the right choice. However, I'd like to speed up the development routine by making the site automatically reload upon any changes in py or template files I make.

I see that any changes in site's. Is there some way how to cause reload when I edit some of the app's py files? Or, I am expected to use IDE that refreshes the. It will auto-reload the flask app when a code change happens.

flask refresh page

The werkzeug debugger already has an 'auto reload' function available that can be enabled by doing one of the following:. You can also use a separate configuration file to manage all your setup if you need be. For example I use 'settings. Importing this file is easy too. I went this route to mimic production as close as possible with my nginx setup. Simply running the flask app with it's built in web server behind nginx it would result in a bad gateway error.

Install the python-dotenv module, which will read local preference for your project environment. With this config for your Flask project, when you run flask run and you will see this output in your terminal:. But using different configuration file to handle the actual working environment seems like a better solution, so I strongly recommend this method I use. Learn more.

Auto reloading python Flask app upon code changes Ask Question. Asked 6 years, 11 months ago. Active 3 months ago. Viewed k times. Passiday Passiday 4, 5 5 gold badges 29 29 silver badges 50 50 bronze badges.It is the perfect tool to make web applications more dynamic by exchanging JSON between server and client. JSON itself is a very lightweight transport format, very similar to how Python primitives numbers, strings, dicts and lists look like which is widely supported and very easy to parse.

It became popular a few years ago and quickly replaced XML as transport format in web applications. In this case you have to put jQuery into your static folder as a fallback, but it will first try to load it directly from Google. This has the advantage that your website will probably load faster for users if they went to at least one other website before using the same jQuery version from Google because it will already be in the browser cache. Do you know where your application is? But what if you later decide to move your application to a different location?

A simple method would be to add a script tag to our page that sets a global variable to the prefix to the root of the application. Something like this:. The safe is necessary in Flask before 0. Usually this would be necessary, but we are inside a script block here where different rules apply.

In Flask 0. This is a really ridiculous example and is something you usually would do on the client side alone, but a simple example that shows how you would use jQuery and Flask nonetheless:. As you can see I also added an index method here that renders a template. This template will load jQuery as above and have a little form where we can add two numbers and a link to trigger the function on the server side.

In test/development environments

Note that we are using the get method here which will never fail. If the key is missing a default value here 0 is returned. Furthermore it can convert values to a specific type like in our case int.

Your index. Notice that we also drop the script directly into the HTML here. It is usually a better idea to have that in a separate script file:. If that function returns falsethe default behavior will not kick in in this case, navigate to the URL.

Once the data arrived, it will call the given function with the return value as argument. Check out the example source for a full application demonstrating the code on this page, as well as the same thing using XMLHttpRequest and fetch. Navigation index modules next previous Flask Documentation 1.

Where is My Site? Created using Sphinx 2.I am developing a simple flask app that is using Flask-Socketio. It is running on a custom websocket app and uses socket. Eventlet is install on the server so it should be running the server with that. The process is run by a supervisor script which is running on a different port. The app works almost perfectly. Upon going to the webpage I can view the site, requests are successfully made, etc.

My problem occurs when I attempt to refresh the page — the page times out. Typically the first refresh works, although some of the requests seem to be lost in the ether. The second refresh seems to never work on any web page regardless of its complexity. I am worried that this has something to do with eventlet running the server.

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I have seen a few people reference celery but I am unsure if this is necessary. I am fine adding in celery if required but don't want to add complexity if it's not necessary.

It is difficult to say since it could be any number of things based on the complexity of the stack you describe. If I were you I would attempt to debug the process thread which is running the server, and see what is happening after the first request. Answers and Comments. Getting up and running Total webdev noob.

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Matplotlib pyplot mpld3. Connection problem between Celery and RabbitMQ. Python 2. SMTP through Python - error, can't send mail. Updated guide for using Websockets. Community site: login faq. Flask App Hangs on Refresh.

flask refresh page

Let me know if anyone wants more information, thanks in advance! One Answer:. Your answer. Foo 2. Bar to add a line break simply add two spaces to where you would like the new line to be. Affiliate program. First time here?In this Flask web development tutorial, we're going to cover how to incorporate jQuery with our Flask application.

The idea for this is to create a more interactive web application. With jQuery, you will be able to allow for elements and parts of your web page to be changed, in accordance with backend processes, without needing to actually refresh the web page. Allowing for asynchronous loading like this gives you quite a few gains. Immersion, interactivity, and ease of use all go up. Furthermore, speed is improved. Let's consider a simple example, where we ask the user what the best programming language is.

If they answer "python," then they are obviously correct and we'll display on the screen they are wise. If they answer anything else, we'll prompt them to try again. Regardless of what they type, and the answer, we want to keep the page from reloading, and just use jQuery to make the magic happen. Nothing too impressive yet.

Typical function that returns a template. Let's make the interactive. Here, we have some html that creates a short text input field, has a submit button, and a result.

These ideas are to be used in some javascript. We'll put this javascript in the head of this same file, like so:. Now, this isn't a javascript tutorial, but we can break this down anyway. After this, the result is populated with the data. We could return multiple values in the JSON.

For example we might also pack an image. So, here's a page meant to not really be visited by the public. All it does is return a json, based on user input. As you can see, if the user types in Python or python, they are claimed to be wise. Otherwise, they are told to try again. Should there be any sort of error, we're returning an error, but we could also return a json to try again, when in production.

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Try typing something, pressing submit or enter, and see what happens. You should be greeted with the response you created, and the page should not reload. If you see nothing, you are probably getting an error. Press F12 if you are in chrome, and you can read the script error if there is one. From here, you should be returned a JSON, like:. If not, read the error, since we're outputing the errors.

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The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. You do not need to include the URL. Just use only the content attribute of meta tag. But to see the real time changes in your graph, you might want to look at sockets in flask. This will help server push changes to all clients using broadcasting.

Using sockets is way better approach than to refresh your page at regular interval. Learn more. How to refresh the flask web page? Ask Question. Asked 2 years, 8 months ago. Active 2 years, 8 months ago. Viewed 14k times. Recently, I have a project is to implement the dynamic plotting on a web page. If I want to observe the change of the plotting, I still need to refresh it manually. Can anyone help me to solve this problem?

Thanks a lot. You might wanna refer to this answer: stackoverflow. This has nothing to do with Python or Flask. Check the link provided by LingchaoCao. Active Oldest Votes.

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