fetch query from url parameter

[rprimet]

This change allows the sharing of links pointing directly to a query, which is an important feature in the main neuroquery website.

For instance, try https://notebooks.gesis.org/binder/v2/gh/rprimet/neuroquery_apps/query_string?urlpath=%2Fvoila%2Frender%2Fminimal_dashboard.py%3Fquery%3Dadhd

A further refinement would be to allow creating these sharing links from within the voilà dashboard itself, but this may require some introspection (see if we are running from within a binderhub service, obtain the hostname etc.)

[jeromedockes]

Awesome! thanks @rprimet , indeed this is an important feature. I will try it out and merge this afternoon

[jeromedockes]

When I run it locally (with the command in the README), the QUERY_STRING env variable does not seem to be set -- so the example query is always used. Do you observe this too?
Also, should we redirect to a URL including the query when the user enters text in the box and hits the "run query" button?

[rprimet]

Did you run voilà >= 0.2.2 (the query string feature is fairly recent) ?
It seems to run locally in my case (see screenshot)

Regarding the URL redirection, that's an excellent idea but it would cause the whole page execution to restart IIUC (including loading the model...) which would be fairly slow I guess. A possible hacky workaround might be to edit the URL in-place (that might require some JS?) but I guess a "share query" link in the UI itself would be a good first step and generally more useful, given that, for instance, when running the dashboard in a binderhub setting, copying URLs from the navbar would be ineffective (these point to a temporary single-user jupyter server that gets destroyed after a period of inactivity)

Thoughts?

[jeromedockes]

I seem to be using voila 0.2.2, but the default query seems to be used:

[jeromedockes]

Regarding the URL redirection, that's an excellent idea but it would cause the whole page execution to restart IIUC (including loading the model...) which would be fairly slow I guess. A possible hacky workaround might be to edit the URL in-place (that might require some JS?)

that's true! let's forget about changing the URL

but I guess a "share query" link in the UI itself would be a good first step and generally more useful, given that, for instance, when running the dashboard in a binderhub setting, copying URLs from the navbar would be ineffective (these point to a temporary single-user jupyter server that gets destroyed after a period of inactivity)

that's a much better idea! I guess we could even have a "copy to clipboard"
button. I may have some time to look into it this weekend but I'm not sure