Can't read contents of a file #16

gregnordin · 2024-11-28T07:51:20Z

gregnordin
Nov 28, 2024

@laffra: I'm trying to read the contents of a user-specified text file with the code appended below as main.py. I keep getting an error because ltk.File evidently does not generate the full path of the file and instead gives something like C:\fakepath\testfile.txt where testfile.txt is the correct name of the file I selected. I assume I'm missing something, but I don't know what. Is there a way to read the contents of a text file?

import ltk

def read_file(file):
    with open(file, encoding="utf-8") as fp:
        file_text = ltk.create("<script>").text(fp.read())
    return file_text

def feedback(text):
    ltk.find("#feedback").html(text).css("text-align", "left")

@ltk.callback
def handle_file(event):
    element = ltk.find(event.target)
    kind = element.prop("type")
    feedback(f"{kind}: {element.val()}")
    file_text = read_file(element.val())
    ltk.html(file_text).appendTo(ltk.find("body"))

def create():
    return ltk.VBox(
        ltk.Heading1("Can we read a file?"),
        ltk.File().on("change", handle_file),
        ltk.Text("File name goes here").attr("id", "feedback"),
    )

create().appendTo(ltk.find("body"))

gregnordin · 2024-11-28T17:30:01Z

gregnordin
Nov 28, 2024
Author

I find I can read a text file using only pyscript with the code below. Is there a way to do it with ltk?

# main.py
from js import document, console, FileReader
from pyodide.ffi import create_proxy

def read_file(event):
    try:
        # Get the selected file
        files = event.target.files
        if not files or files.length == 0:
            return

        file = files.item(0)  # Using item() instead of indexing

        def handle_load(e):
            content = e.target.result
            output_div = document.getElementById("output")
            output_div.innerHTML = f"<pre>{content}</pre>"

        # Create a FileReader
        reader = FileReader.new()
        reader.onload = create_proxy(handle_load)

        # Read the file
        reader.readAsText(file)
    except Exception as e:
        console.error(f"Error: {str(e)}")
        output_div = document.getElementById("output")
        output_div.innerHTML = f"<pre>Error reading file: {str(e)}</pre>"

# Add event listener to the file input
file_input = document.getElementById("fileInput")
file_input.addEventListener("change", create_proxy(read_file))

#-----------------------------------------------------------------------------
# index.html
<!DOCTYPE html>
<html>

<head>
    <title>PyScript File Reader</title>
    <script defer src="https://pyscript.net/latest/pyscript.js"></script>
    <link rel="stylesheet" href="https://pyscript.net/latest/pyscript.css">
</head>

<body>
    <h1>PyScript File Reader</h1>
    <input type="file" id="fileInput" accept=".txt">
    <div id="output"></div>

    <script type="py" src="./main.py"></script>
</body>

</html>

0 replies

laffra · 2024-11-28T18:16:44Z

laffra
Nov 28, 2024
Maintainer

In LTK, I would use ltk.File(handler) as shown in the LTK Kitchensink using LTK >v0.2.8. See the source for ltk.File here

0 replies

gregnordin · 2024-11-29T01:06:25Z

gregnordin
Nov 29, 2024
Author

Awesome--that works great! Thank you so much!

Here is some code that exercises the new file reading ability in case it is useful for anyone.

#--------------------------------------------------------------------
# main.py
import ltk

@ltk.callback
def loaded_file(file, content):
    ltk.find("#content").html(content)

def create():
    return ltk.VBox(
        ltk.Heading1("Can we read a file?"),
        ltk.File(loaded_file),
        ltk.Label("File contents:"),
        ltk.Preformatted(
            "File contents will be shown here after selecting file.",
            {
                "margin-left": 20,
                "margin-right": 20,
                "padding": 8,
                "background-color": "lightyellow",
                "border": "1px solid gray",
            },
        ).attr("id", "content"),
    )

create().appendTo(ltk.find("body"))

#--------------------------------------------------------------------
# index.html
<!DOCTYPE html>
<html lang="en">

<head>
    <title>Try to read file</title>

    <!-- Recommended meta tags -->
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width,initial-scale=1.0">

    <!-- PyScript CSS -->
    <link rel="stylesheet" href="https://pyscript.net/releases/2024.10.2/core.css">

    <!-- This script tag bootstraps PyScript -->
    <script type="module" src="https://pyscript.net/releases/2024.10.2/core.js"></script>

    <!-- Import jQuery - used in ltk/jquery.py -->
    <script src="https://cdn.jsdelivr.net/npm/jquery@3.7.1/dist/jquery.min.js"></script>
    <script src="https://cdn.jsdelivr.net/npm/jquery-ui@1.13.2/dist/jquery-ui.min.js"></script>
    <link rel="stylesheet" href="https://ajax.googleapis.com/ajax/libs/jqueryui/1.13.2/themes/base/jquery-ui.css" />
</head>

<body>
    <script type="py" src="./main.py" config="./pyscript.toml"></script>
</body>

</html>

#--------------------------------------------------------------------
# pyproject.toml
packages = ["pyscript-ltk"]
[files]
"https://raw.githubusercontent.com/pyscript/ltk/main/ltk/ltk.js" = "ltk/ltk.js"
"https://raw.githubusercontent.com/pyscript/ltk/main/ltk/ltk.css" = "ltk/ltk.css"

0 replies

laffra · 2024-11-29T08:13:12Z

laffra
Nov 29, 2024
Maintainer

Can you put that example on pyscript.com? Then we can link to it from the LTK docs. Chris

…

On Fri, Nov 29, 2024 at 2:06 AM Greg Nordin ***@***.***> wrote: Awesome--that works great! Thank you so much! Here is some code that exercises the new file reading ability in case it is useful for anyone. #-------------------------------------------------------------------- # main.py import ltk @ltk.callback def loaded_file(file, content): ltk.find("#content").html(content) def create(): return ltk.VBox( ltk.Heading1("Can we read a file?"), ltk.File(loaded_file), ltk.Label("File contents:"), ltk.Preformatted( "File contents will be shown here after selecting file.", { "margin-left": 20, "margin-right": 20, "padding": 8, "background-color": "lightyellow", "border": "1px solid gray", }, ).attr("id", "content"), ) create().appendTo(ltk.find("body")) #-------------------------------------------------------------------- # index.html <!DOCTYPE html> <html lang="en"> <head> <title>Try to read file</title>  <meta charset="UTF-8"> <meta name="viewport" content="width=device-width,initial-scale=1.0">  <link rel="stylesheet" href="https://pyscript.net/releases/2024.10.2/core.css">  <script type="module" src="https://pyscript.net/releases/2024.10.2/core.js"></script>  <script ***@***.***/dist/jquery.min.js"></script> <script ***@***.***/dist/jquery-ui.min.js"></script> <link rel="stylesheet" href="https://ajax.googleapis.com/ajax/libs/jqueryui/1.13.2/themes/base/jquery-ui.css" /> </head> <body> <script type="py" src="./main.py" config="./pyscript.toml"></script> </body> </html> #-------------------------------------------------------------------- # pyproject.toml packages = ["pyscript-ltk"] [files] "https://raw.githubusercontent.com/pyscript/ltk/main/ltk/ltk.js" = "ltk/ltk.js" "https://raw.githubusercontent.com/pyscript/ltk/main/ltk/ltk.css" = "ltk/ltk.css" — Reply to this email directly, view it on GitHub <#16 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AE4XAKF3KK3GHZG5MUNYKKT2C642NAVCNFSM6AAAAABSUPZQKSVHI2DSMVQWIX3LMV43URDJONRXK43TNFXW4Q3PNVWWK3TUHMYTCNBRGEZDCMQ> . You are receiving this because you were mentioned.Message ID: ***@***.***>

0 replies

gregnordin · 2024-11-29T20:12:16Z

gregnordin
Nov 29, 2024
Author

I put the example on pyscript.com at https://pyscript.com/@gnordin/ltk-read-a-file/latest. If there is a different place you would like it, please let me know. I've not really used pyscript.com before so I don't know what the norms are in how to share things there.

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