Create Your First Application!
Get to know Nette Framework while creating a simple blog with comments. Let's begin!
After the first two chapters, you will have your own working blog and you'll be ready to publish your awesome posts, although the features will be pretty much limited after completing these two chapters. To make things nicer for your users, you should also read the following chapters and keep improving your application.
This tutorial assumes that you completed the Installation document and have successfully set up your tooling.
Please use PHP 8.1 or later. You can find the complete application on GitHub.
The Welcome Page
Let's start by creating a new project into the
composer create-project nette/web-project nette-blog
At this moment, the welcome page of the Web Project should be running. Try it by opening your browser and going to the following URL:
and you should see the Nette Framework welcome page:
The application works and you can now start making changes to it.
If you have a problem, try these few tips.
Web Project’s Content
Web Project has the following structure:
nette-blog/ ├── app/ ← application directory │ ├── Presenters/ ← presenter classes │ │ └── templates/← templates │ ├── Router/ ← configuration of URL addresses │ └── Bootstrap.php ← booting class Bootstrap ├── bin/ ← scripts for the command line ├── config/ ← configuration files ├── log/ ← error logs ├── temp/ ← temporary files, cache, … ├── vendor/ ← libraries installed by Composer │ └── autoload.php ← autoloading of libraries installed by Composer └── www/ ← public folder - the only place accessible from browser └── index.php ← initial file that launches the application
directory directly accessible from the browser, so you can point the root directory of your web server here (you can configure it
in Apache, but let’s do it later as it’s not important right now).
The most important directory for you is
app/. You can find
Bootstrap.php file there, inside which is
a class that loads the framework and configures the application. It activates autoloading and sets up the debugger
The Web Project contains a welcome page, which we can remove – feel free to delete the
app/Presenters/templates/Home/default.latte file and replace it with the text “Hello world!”.
An extremely important tool for development is a debugger called Tracy. Try to make
some errors in your
app/Presenters/HomePresenter.php file (e.g. remove a curly bracket from the definition of class
HomePresenter) and see what happens. A red-screen page will pop up with an understandable error description.
Tracy will significantly help you while hunting down errors. Also note the floating Tracy Bar in the bottom right corner, which informs you about important runtime data.
In the production mode, Tracy is, of course, disabled and does not reveal any sensitive information. All errors are saved into
log/ directory instead. Just try it out. In
app/Bootstrap.php, find the following piece of code,
uncomment the line and change the method call parameter to
false, so it looks like this:
... $configurator->setDebugMode(false); $configurator->enableTracy(__DIR__ . '/../log'); ...
After refreshing the web page, the red-screen page will be replaced with the user-friendly message:
Now, look into the
log/ directory. You can find the error log there (in exception.log file) and also the page with
the error message (saved in an HTML file with a name starting with
// $configurator->setDebugMode(false); again. Tracy automatically enables development mode on
localhost environment and disables it elsewhere.
Now, we can fix the bug and continue designing our application.
We will show you a trick that will make open source authors happy. You can easily give a star on GitHub to the libraries that your project uses. Just run: