From pyscript, how can I access the file that I load from html?
Question
This is the html input from which I load my file
<input type="file" id="fasta_1" accept=".fasta" class="form-control-file">
And this is the block of code from which I try to access the file but it doesn't work for me.
fasta_1 = Element("fasta_1")
document = fasta_1.element.files[0]
print(document)
#document = evt.target.files[0]
#with open(document, "r") as f:
#txtread = f.read()
#print(document)
1 answers
solution1
0 2022-07-26 14:48:59
For security reasons you should create a file listener and use pyodide's create_proxy to load a local file and then process the file asynchronously. It looks like this
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<link rel="stylesheet" href=pyscript.css" />
<script defer src="pyscript.js"></script>
<!-- <link rel="stylesheet" href="https://pyscript.net/alpha/pyscript.css" />
<script defer src="https://pyscript.net/alpha/pyscript.js" onerror=scriptLoadFailure('pyscr ipt.js')></script> -->
<py-env>
paths:
./main.py
</py-env>
</head>
<body>
<py-script id="main" src="./main.py"></py-script>
<input type="file" id="fasta_1" accept=".fasta" class="form-control-file">
<div id="outMsg"></div>
</body>
</html>
And your main.py script (I put it in src attribute of py-script node of index.html) creating a proxy and processing the file that you choose.
import asyncio
from pyodide import create_proxy
#
#
def Setup_File_Listener():
file_event = create_proxy(Process_File)
e = document.getElementById("fasta_1")
e.addEventListener("change", file_event, False)
#
#
async def Process_File(event):
fileList = event.target.files.to_py()
for f in fileList:
data = await f.text()
show_data(data) # OR do something else with the data
#
#
def show_data(data):
document.getElementById("outMsg").innerHTML = data
# -----------------------------------------------------
Setup_File_Listener()
This way browser waits for a change event to happen on your input file element and then the file event defined in listener (Process_File()) activates asynchronous processing the file. More about it at: https://www.jhanley.com/pyscript-javascript-callbacks/
solution2
0 2022-07-26 15:03:20
Try using pandas
pandas.read_html()
https://pandas.pydata.org/docs/reference/api/pandas.read_html.html
Alternatively, you could take the HTML file and depending on the data you want, send it to a csv, from which you can easily access.
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