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Upload_and_download_files

In addition to any assets you ship with your app, many web app will often need to receive or send files, whether you want to share medias, allow user to import their data, or export some backend data.

In this section, we will cover all you need to know for manipulating files in Reflex.

If you want to let the users of your app download files from your server to their computer, Reflex offer you two way.

For some basic usage, simply providing the path to your resource in a rx.link will work, and clicking the link will download or display the resource.

rx.link("Download", href="/reflex_banner.png")

Using the rx.download event will always prompt the browser to download the file, even if it could be displayed in the browser.

The rx.download event also allows the download to be triggered from another backend event handler.

rx.button(
    "Download",
    on_click=rx.download(url="/reflex_banner.png"),
)

rx.download lets you specify a name for the file that will be downloaded, if you want it to be different from the name on the server side.

rx.button(
    "Download and Rename",
    on_click=rx.download(
        url="/reflex_banner.png",
        filename="different_name_logo.png",
    ),
)

If the data to download is not already available at a known URL, pass the data directly to the rx.download event from the backend.

import random


class DownloadState(rx.State):
    def download_random_data(self):
        return rx.download(
            data=",".join(
                [
                    str(random.randint(0, 100))
                    for _ in range(10)
                ]
            ),
            filename="random_numbers.csv",
        )


def download_random_data_button():
    return rx.button(
        "Download random numbers",
        on_click=DownloadState.download_random_data,
    )

The data arg accepts str or bytes data, a data: URI, PIL.Image, or any state Var. If the Var is not already a string, it will be converted to a string using JSON.stringify. This allows complex state structures to be offered as JSON downloads.

Reference page for rx.download here .

Uploading files to your server let your users interact with your app in a different way than just filling forms to provide data.

The component rx.upload let your users upload files on the server.

Here is a basic example of how it is used:

def index():
    return rx.fragment(
        rx.upload(rx.text("Upload files"), rx.icon(tag="upload")),
        rx.button(on_submit=State.<your_upload_handler>)
    )

For detailed information, see the reference page of the component here .

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