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Creating Interfaces

.. toctree::
    :hidden:

    html-with-reactpy/index
    your-first-components/index
    rendering-data/index


.. dropdown:: :octicon:`bookmark-fill;2em` What You'll Learn
    :color: info
    :animate: fade-in
    :open:

    .. grid:: 1 2 2 2

        .. grid-item-card:: :octicon:`code-square` HTML with ReactPy
            :link: html-with-reactpy/index
            :link-type: doc

            Construct HTML layouts from the basic units of user interface functionality.

        .. grid-item-card:: :octicon:`package` Your First Components
            :link: your-first-components/index
            :link-type: doc

            Define reusable building blocks that it easier to construct complex
            interfaces.

        .. grid-item-card:: :octicon:`database` Rendering Data
            :link: rendering-data/index
            :link-type: doc

            Use data to organize and render HTML elements and components.

ReactPy is a Python package for making user interfaces (UI). These interfaces are built from small elements of functionality like buttons text and images. ReactPy allows you to combine these elements into reusable, nestable :ref:`"components" <your first components>`. In the sections that follow you'll learn how these UI elements are created and organized into components. Then, you'll use components to customize and conditionally display more complex UIs.

Section 1: HTML with ReactPy

In a typical Python-base web application the responsibility of defining the view along with its backing data and logic are distributed between a client and server respectively. With ReactPy, both these tasks are centralized in a single place. The most foundational pilar of this capability is formed by allowing HTML interfaces to be constructed in Python. Let's consider the HTML sample below:

<h1>My Todo List</h1>
<ul>
    <li>Build a cool new app</li>
    <li>Share it with the world!</li>
</ul>

To recreate the same thing in ReactPy you would write:

from reactpy import html

html.div(
    html.h1("My Todo List"),
    html.ul(
        html.li("Design a cool new app"),
        html.li("Build it"),
        html.li("Share it with the world!"),
    )
)

.. card::
    :link: html-with-reactpy/index
    :link-type: doc

    :octicon:`book` Read More
    ^^^^^^^^^^^^^^^^^^^^^^^^^

    Construct HTML layouts from the basic units of user interface functionality.

Section 2: Your First Components

The next building block in our journey with ReactPy are components. At their core, components are just a normal Python functions that return :ref:`HTML <HTML with ReactPy>`. The one special thing about them that we'll concern ourselves with now, is that to create them we need to add an @component decorator. To see what this looks like in practice we'll quickly make a Photo component:

.. reactpy:: your-first-components/_examples/simple_photo


.. card::
    :link: your-first-components/index
    :link-type: doc

    :octicon:`book` Read More
    ^^^^^^^^^^^^^^^^^^^^^^^^^

    Define reusable building blocks that it easier to construct complex interfaces.

Section 3: Rendering Data

The last pillar of knowledge you need before you can start making :ref:`interactive interfaces <adding interactivity>` is the ability to render sections of the UI given a collection of data. This will require you to understand how elements which are derived from data in this way must be organized with :ref:`"keys" <Organizing Items With Keys>`. One case where we might want to do this is if items in a todo list come from a list of data that we want to sort and filter:

.. reactpy:: rendering-data/_examples/todo_list_with_keys


.. card::
    :link: rendering-data/index
    :link-type: doc

    :octicon:`book` Read More
    ^^^^^^^^^^^^^^^^^^^^^^^^^

    Use data to organize and render HTML elements and components.