SampleCode for Module to read a specific Information from a webpage

newbi

Hello,
i want to create a easy module that only reads a specific Information from a web page.
Can someone provide me a simple sample how to do this?
No formating just reading an writing on the MM screen.
I do now basics in programming, but do not want to learn it all from the beginning. I can learn by samples that will help me, in a more better way.
If someone can show me the code that i have to put into the .js file will help me a lot.
Thanks in advance

sdetweil

@newbi describe more, reading specific info

sdetweil

@newbi

you can fetch the page html and then
use the cheerio lib to extract the html part of the page

newbi

@sdetweil, well on a webpage of a gym, there is an information how many people are in the gym. I want to show this Information on my MagicMirror. Thats all.

Can you provide me a sample code?
I am not firm with programming in javascript an libs. My programming experience is business based.

Or is there a module i can use?

How to fetch a html-Page?
How to extract? I thougt i can search the page for a keyword, where the wanted value is nearby. Dirty but hopfuly worky ;)

sdetweil

@newbi well, compliments does fetch, helloworld is a simple module

my sample module is full function, but you wont need a node_helper as fetch works browser

https://github.com/sdetweil/SampleModule

cheerio is a nodejs lib you can find in npmjs , and will require the node_helper, so best to combine fetch and cheerio there

the module development doc is here
https://docs.magicmirror.builders/development/introduction.html

sdetweil

@newbi we will help you if you get stuck making it work, but wont write it for you

newbi

@sdetweil, ok, thanks so far, i will try to get firm with the basics.
As i am working on my Windows Laptop, having a MagicMirror on a Raspy 3, can i develope on my Laptop or do i need to create a developement environment on my raspy (or on my Windows Laptop)?

chrisfr1976

@newbi
If you want to display how crowded yor gym is, use HTML Snippet or SmartWebDisplay. Cheerio is more for static pages useful. If yor gym does not block iframes thi is the easiest way imho.

sdetweil

@newbi MagicMirror runs on windows

need to follow the install instructions

need nodejs (20.18.1, or 22 up)
git

there is a separate start script for windows

npm run start:windows

also see
https://forum.magicmirror.builders/post/121672

rkorell

@newbi asked

can i develope on my Laptop or do i need to create a developement environment on my raspy

Dear @newbi ,
neither, nor :-)
You can “develop” physically on your laptop but the files (should) remain on the Raspi.
On the Raspi therefore you do not need a “development” environment.
You need a FTP Browser - connect this one via SFTP to the Raspi (SSH should be enabled on the Raspi - then SFTP works inherently).

Than you click right on the remote (Raspi) File(s) you need to modify and open the file(s) with a (Laptop) local editor of your choice.
When changes are done, save the file and restart the mirror - then you see the changes.

At least this is the way as I do those things - currently NOT programming but changing custom.css and config.js.

I am on a Windows laptop in most cases and I use BitVize for FTP and SSH and Sublime as Editor (which is for “programmers” because several “languages” are marked up nicely).
For a quick view on the result I use VNC-Viewer which gives me a better view because I have my display in portrait format which isn’t displayed nicely in Webbrowser).

HTH
Regards,
Ralf