Subj : Synchronet Javascript and reading XML
To : KenDB3
From : echicken
Date : Wed Jul 27 2016 11:10 pm
> I'm rather stuck on something. Is there a way to read an XML file using the
> Synchronet Javascript model?
E4X (ECMAScript for XML, IIRC) is still available in Synchronet's JS
interpreter as far as I know. It's kinda shitty but can get the job done.
Documentation can be found on the web.
There are probably a few Synchronet-specific examples of how to use it;
'exec/load/rss-atom.js', which I made, is not the best but does what it does
and should be easy to follow. It uses E4X to turn an RSS or Atom feed (both
are XML) into an easier-to-work-with JS object.
> JSON has the lovely JSON.parse(), but I'm not sure how to read the data, or
> maybe convert it into JSON to make things easier. I even noticed that
> XMLHttpRequest is not defined, while HTTPRequest is defined.
XMLHttpRequest is something that exists in browsers, and doesn't necessarily
have to have anything to do with XML. It's a way for a script to make the
browser load something asynchronously / in the background via HTTP; good for
updating content on a page without the user having to reload.
HTTPRequest is defined if you load 'exec/load/http.js' into your script.
That's an HTTP(S) client for Synchronet's JS environment which you can use in
your scripts (and I assume you already do in that weather script).
> A lot of the code snippets I find tend to use things in the DOM and has
> things like hasChildNodes which is not defined in Core JS or Sync.
Yes, if you look for XML parsing via JS, the vast majority of examples will be
DOM-based and/or browser specific. We don't have the DOM around here. It's
possible that you'd be able to find a pure-JS parser if you looked, which may
or may not be portable for Synchronet with some effort.
> For reference, I am trying to grab the data found here:
>
http://www.hamqsl.com/solarxml.php
There's already some code for dealing with this exact feed, but it's embedded
in an IRC bot. You might be able to find something useful in:
'/exec/ircbots/ham/ham.js', however this should work:
load('http.js');
try {
var solardata = new XML(
(new HTTPRequest()).Get(
'
http://www.hamqsl.com/solarxml.php'
).replace(
/<\?[^?]*\?>/g, ''
)
).solardata;
} catch (err) {
log('Shit done borked! ' + err);
}
(See
https://bbs.electronicchicken.com/temp/solar.txt if that didn't come
through okay.)
You should then be able to get at the values from the feed like so:
print(solardata.sunspots);
print(solardata.solarwind);
And so on.
The IRC bot code mentioned above has examples of how to deal with the nested
'calculated(vhf)conditions' values, which gets deeper into E4X than I care to
do right now.
Hope this helps.
---
echicken
electronic chicken bbs - bbs.electronicchicken.com - 416-273-7230
� Synchronet � electronic chicken bbs - bbs.electronicchicken.com
