Yesterday I started work in earnest on the leowapp.py plugin. The gui work
is complete for now: the web page contains the outline, body and log panes
and the minibuffer.
Attempting two-way communication encountered a roadblock. Putting
"require(http)" in a client-side script fails with the console message:
ReferenceError: require is not defined
We can not use a node.js server in the browser, as explained here
<https://stackoverflow.com/questions/19059580/client-on-node-uncaught-referenceerror-require-is-not-defined>
.
With my new insights about sockets, I saw that the proper question is *not*:
Can javascript create *servers *in browsers?
but instead:
Can javascript create *sockets *in browsers?
The answer to this question is an emphatic yes
<https://stackoverflow.com/questions/1736382/how-to-use-sockets-in-javascript-html>.
This leads to WebSockets <https://en.wikipedia.org/wiki/WebSocket>, with
this tutorial <https://www.html5rocks.com/en/tutorials/websockets/basics/>.
*Summary*
WebSockets is perfect for LeoWapp: high performance, two-way communication,
supported by all major browsers. LeoWapp is essential if Leo's browser gui
is to have the fine granularity I envisaged in the initial design.
web.py <http://webpy.org/> or requests
<http://docs.python-requests.org/en/master/> might replace the aging, ugly,
python-side guts of leowapp.py. (The present code barfs on POST requests).
We shall see. requests is part of the Anaconda distro, web.py is not.
Edward
P. S. Imo, LeoWapp should *require *Python 3. I see no justification
supporting Python 2 in leading-edge web work. Comments in the
documentation for the requests package indicate that there are serious
problems in attempting to do so.
EKR
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