jcb91
commented
6 years ago With small/new notebooks - all extensions work well. With a big notebook - they don't start.
Unfortunately, although this (timeout) can be caused by nbextensions which take a long time to load, it's also an issue with notebook itself. You can check https://github.com/jupyter/notebook/issues/2075 for details, but essentially as I understand it, what's happening is that
- notebook javascript fires off requests to load nbextensions
- notebook javascript starts loading all the notebook content (rendering markdown cells etc)
- loading big notebooks takes a long time and, crucially, it blocks the loading of require-specified scripts from 1. As a result, the require library assumes the requests have timed out, and doesn't bother to try loading the nbextensions.
probably I used setTimeout option wrong? Am I right that it should be added to notebook metadata, like this:
To mitigate this issue, you can increase the timeout for requirejs as specified in https://github.com/ipython-contrib/jupyter_contrib_nbextensions/issues/822#issuecomment-269912319. But, this doesn't go in notebook metadata, or notebook config. Instead, you need to add something like the following in your custom.js:
// default is 30s, increase to 1 minute
window.requirejs.config({waitseconds: 60});You can find details of where to find/create a custom.js file at http://jupyter-notebook.readthedocs.io/en/latest/examples/Notebook/JavaScript%20Notebook%20Extensions.html#custom.js. This (using custom.js instead of an nbextension) is necessary because it's the only way to guarantee that it gets executed before the notebook load call.
Alternatively, in a strategy that's only just occurred to me (so is untested!) you could delay the (attempted) loading of nbextensions until after the notebook fully loads, using the following in custom.js:
require(['base/js/namespace', 'base/js/utils', 'base/js/events'], function (Jupyter, utils, events) {
"use strict";
// only bother if we're in notebook view
if (Jupyter.notebook === undefined) return;
// patch load_extensions to delay until after the notebook has fully loaded
var orig_load_extensions = utils.load_extensions;
utils.load_extensions = function () {
var nbexts = arguments;
if (Jupyter.notebook._fully_loaded) return orig_load_extensions.apply(this, nbexts);
return new Promise(function (resolve, reject) {
console.log('deferring loading of nbextensions');
events.one('notebook_loaded.Notebook', function () {
console.log('loading deferred nbextensions');
resolve(orig_load_extensions.apply(this, nbexts));
});
});
};
});
ODemidenko
webermarcolivier
cholmcc
Benfeitas
iromeo
Artyrm
Timmate
ibobak
IVN-tone
With small/new notebooks - all extensions work well. With a big notebook - they don't start. I've tried setTimeout and enabling/disabling Highlighter extension as was suggested in issue 1009 But that helped only once (and I didn't get which advice actually helped). And now the problem continues.
In the JS console I see following error:
probably I used setTimeout option wrong? Am I right that it should be added to notebook metadata, like this:
? BTW: I have just updated nbextensions and this didn't help either