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Flask javascript page

Flask javascript page

We use a template and it generates code according to the content. Flask is one of the web development frameworks written in Python. The code will be stored in Directories in the format of Flask. So we will be making two directories. We will print a Python list with Some names of Pokemons first in the format of a list and then a table. Example 1: Making a List We will use the argument Pokemons passed from python file here to automatically print a list instead of Writing it everytime.

Output: Without writing any data of list, the list will be automatically generated. You can use the css and js to make these look beautiful.

Example 2: Making a Table. We will use the argument Pokemons passed from python file here to automatically print a table instead of Writing it our self. Code for app. Output: Without writing any data of list, the table will be automatically generated.

Python | Using for loop in Flask

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Load Comments.This is the twentieth installment of the Flask Mega-Tutorial series, in which I'm going to add a nice popup when you hover your mouse over a user's nickname. Note 1: If you are looking for the legacy version of this tutorial, it's here. Note 2: If you would like to support my work on this blog, or just don't have patience to wait for weekly articles, I am offering the complete version of this tutorial packaged as an ebook or a set of videos.

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Nowadays it is impossible to build a web application that doesn't use at least a little bit of JavaScript. As I'm sure you know, the reason is that JavaScript is the only language that runs natively in web browsers. In Chapter 14 you saw me add a simple JavaScript enabled link in a Flask template to provide real-time language translations of blog posts. In this chapter I'm going to dig deeper into the topic and show you another useful JavaScript trick to make the application more interesting and engaging to users.

A common user interface pattern for social sites in which users can interact with each other is to show a quick summary of a user in a popup panel when you hover over the user's name, anywhere it appears on the page. If you have never paid attention to this, go to Twitter, Facebook, LinkedIn, or any other major social network, and when you see a username, just leave your mouse pointer on top of it for a couple of seconds to see the popup appear.

flask javascript page

This chapter is going to be dedicated to building that feature for Microblog, of which you can see a preview below:. Before we delve into the client-side, let's get the little bit of server work that is necessary to support these user popups out of the way. The contents of the user popup are going to be returned by a new route, which is going to be a simplified version of the existing user profile route.

Python Flask: serve static files: (CSS, JavaScript, images, etc.)

Here is the view function:. The template is a shorter version of the one used for the user profile page:. The JavaScript code that I will write in the following sections will invoke this route when the user hovers the mouse pointer over a username. In response the server will return the HTML content for the popup, which the client then display. When the user moves the mouse away the popup will be removed.

Sounds simple, right? In Chapter 11 I introduced you to the Bootstrap framework as a convenient way to create great looking web pages. So far, I have used only a minimal portion of this framework. One of these components is the Popoverwhich is described in the documentation as a "small overlay of content, for housing secondary information". Exactly what I need! Some of the most advanced ones also require JavaScript.

The standard way in which an application includes these components in a web page is by adding the HTML in the proper place, and then for the components that need scripting support, calling a JavaScript function that initializes it or activates it. The popover component does require JavaScript support.

The HTML portion to do a popover is really simple, you just need to define the element that is going to trigger the popover to appear. In my case, this is going to the clickable username that appears in each blog post. Now according to the popover documentation, I need to invoke the popover JavaScript function on each of the links like the one above that appear on the page, and this will initialize the popup. The initialization call accepts a number of options that configure the popup, including options that pass the content that you want displayed in the popup, what method to use to trigger the popup to appear or disappear a click, hovering over the element, etc.

Unfortunately, after reading this information I ended up with more questions than answers, because this component does not appear to be designed to work in the way I need it to. The following is a list of problems I need to solve to implement this feature:. It is actually not that uncommon when working with browser based applications that things get complicated really fast. You have to think very specifically in terms of how the DOM elements interact with each other and make them behave in a way that gives the user a good experience.

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It is clear that I'm going to need to run some JavaScript code as soon as each page loads. The function that I'm going to run will search for all the links to usernames in the page, and configure those with a popover component from Bootstrap.

The jQuery JavaScript library is loaded as a dependency of Bootstrap, so I'm going to take advantage of it. My first problem is to create a JavaScript function that finds all the user links in the page.Version 1. Read about the new features and fixes from March. Flask is a lightweight Python framework for web applications that provides the basics for URL routing and page rendering.

Flask is called a "micro" framework because it doesn't directly provide features like form validation, database abstraction, authentication, and so on. Such features are instead provided by special Python packages called Flask extensions. The extensions integrate seamlessly with Flask so that they appear as if they were part of Flask itself. For example, Flask doesn't provide a page template engine, but installing Flask includes the Jinja templating engine by default.

For convenience, we typically speak of these defaults as part of Flask. In this Flask tutorial, you create a simple Flask app with three pages that use a common base template.

Along the way, you experience a number of features of Visual Studio Code including using the terminal, the editor, the debugger, code snippets, and more. The completed code project for this Flask tutorial can be found on GitHub: python-sample-vscode-flask-tutorial.

If you have any problems, feel free to file an issue for this tutorial in the VS Code documentation repository. To successfully complete this Flask tutorial, you must do the following which are the same steps as in the general Python tutorial :. Install the Python extension. You can check the location by running path at the command prompt. If the Python interpreter's folder isn't included, open Windows Settings, search for "environment", select Edit environment variables for your accountthen edit the Path variable to include that folder.

In this section, you create a virtual environment in which Flask is installed. Using a virtual environment avoids installing Flask into a global Python environment and gives you exact control over the libraries used in an application. A virtual environment also makes it easy to Create a requirements. In that folder, use the following command as appropriate to your computer to create a virtual environment named env based on your current interpreter:. Note : Use a stock Python installation when running the above commands.

If you use python.

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Open the project folder in VS Code by running code. Then select the Python: Select Interpreter command:.

Flask – Static Files

The command presents a list of available interpreters that VS Code can locate automatically your list will vary; if you don't see the desired interpreter, see Configuring Python environments.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. If nothing happens, download GitHub Desktop and try again. If nothing happens, download Xcode and try again.

If nothing happens, download the GitHub extension for Visual Studio and try again. In this project I am experimenting with sending data between Javascript and Python using the web framework Flask. Additionally I will use matplotlib to generate a dynamic graph based on the provided user input data.

The POST call give a response from Python and the page is redirected to the results page with the given uuid. Return the unique id that was used for writing to the file. The core of the web application is inside this file. Here I define the different routes for the website and specify the settings. The default route shows the index. The result route will show the image once a picture is drawn, based on the provided unique ID. The content of the POST variable are written to a CSV file which can be used again on the result page where data is loaded from this same file.

The second part of the magic happens in the Javascript file.

Dynamic Charts Using Flask and jQuery

In this file a canvas is generated and added to the DOM. The mouse is used to draw dots on the canvas with a predefined color and radius. One button is used to send the data of the current drawing on the canvas and another one is used to clear the canvas.

Finally we need to define a base template to be used by the index and result page. I know this could be split up nicer and I could make better use of the templating engine, but for this experiment it seemed sufficient. Important: Please note that for the source of the image the specific URL for the matplotlib image is used. The route for plot is called with the parameter imgdata containing the data. I have kept the stylesheet very basic since this project is not aimed at making the most slick interface.

After putting all the files together the application can be started and visited on port on the localhost. Original blog post. Skip to content. Dismiss Join GitHub today GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.

Sign up. This repository contains an example app to communicate between JavaScript and Python. HTML Branch: master. Find file. Sign in Sign up. Go back. Launching Xcode If nothing happens, download Xcode and try again. Latest commit. Latest commit d Dec 6, 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.

The working application is hosted on GitHub.

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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.

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Can you try putting in the following code and see if it works at the top of the file:. 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. Made appropriate changes to application. Can you please help out? How would one go about if one wanted to have not the same random numbers for each client, but a different set of data for each?As of Flask 0.

The Flask-Script extension provides support for writing external scripts in Flask. This includes running a development server, a customised Python shell, scripts to set up your database, cronjobs, and other command-line tasks that belong outside the web application itself.

Flask-Script works in a similar way to Flask itself. You define and add commands that can be called from the command line to a Manager instance:. Source code and issue tracking at GitHub. If you are using virtualenvit is assumed that you are installing Flask-Script in the same virtualenv as your Flask application s.

The first step is to create a Python module to run your script commands in. In your manage. The Manager class keeps track of all the commands and handles how they are called from the command line:. Calling manager. The Manager requires a single argument, a Flask instance. This may also be a function or other callable that returns a Flask instance instead, if you want to use a factory pattern.

Now the command needs to be added to our Manager instance, like the one created above:. This of course needs to be called before manager. Now in our command line:. You can also pass the Command instance in a dict to manager. The Command class must define a run method. The positional and optional arguments depend on the command-line arguments you pass to the Command see below. This will print usage plus the docstring of the Command. For simpler commands you can use the command decorator, which belongs to the Manager instance:.

Commands created this way are run in exactly the same way as those created with the Command class:. As with the Command class, the docstring you use for the function will appear when you run with the -?

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Finally, the option decorator, again belonging to Manager can be used when you want more sophisticated control over your commands:. The option decorator is explained in more detail below. Help was previously available with --help and -h.

This had a couple of less-than-ideal consequences, among them the inability to use -h as a shortcut for --host or similar options.

flask javascript page

Positional and optional arguments are stored as Option instances - see the API below for details. This is useful if you want to be able to return options at runtime based on for example per-instance attributes:. This is an example of a positional argument:. The command decorator is fine for simple operations, but often you need the flexibility. Options can also be passed to the Manager instance.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.

flask javascript page

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.

flask javascript page

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. 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. Pretty cool! Now, you can have jQuery operations running for whatever you like, returning all sorts of things. With this, you can actually create web pages that are only a single, interactive, page. Pretty neat! That's all for now, in the next tutorial we're going to discuss Pygal. Pygal is an SVG plotting library, which is extremely simple, yet also very impressively powerful for making quick interactive embeddable graphs with Python and Flask.