Write (python) dash vs Dash.jl feature comparison table

[etpinard]

and put it in the Dash.jl README.md somewhere?

Resources:

• python dash changelog: https://github.com/plotly/dash/blob/dev/CHANGELOG.md
• Dash.jl assets: https://github.com/plotly/DashCoreResources

[etpinard]

Tentative list

Things that are missing from Dash.jl since before Dash.jl v1 (and dash v1.15.0)

taken from the TODO items in https://github.com/plotly/Dash.jl/projects/1

• User-defined routes https://github.com/plotly/Dash.jl/issues/35
• Debug logging https://github.com/plotly/Dash.jl/issues/13

Things that are missing from Dash.jl from dash v1.x

• from dash v1.16.0, app.csp_hashes()
• from dash v1.19.0 input-output callbacks
• from dash v1.20.0 app(; extra_hot_reload_paths=#= =#)

Things that are missing from Dash.jl since dash v2

note the dash v2 was released on 2021-08-03 :upside_down_face:

• background (fka long) callbacks
• native pages
• make app(; compress=false) by default
• options / value positional arguments for dash core components https://dash.plotly.com/flexible-callback-signatures
• components as arguments for Input, State and Output
• helpers get_relative_path, strip_relative_path, get_asset_url
• improved callback context
• dash Patch
• allow_duplicate to Output arguments
• dash(; include_pages_meta=true)

Things that maybe just work using resources from dash >= v2.10.2

Dash.jl resources were updated in https://github.com/plotly/Dash.jl/pull/212 after an 18+ month hiatus. The update resources are set to be released as part of the upcoming Dash.jl v1.3.0.

TODO, check if

• [x] dcc_geolocation
• [x] Promise in clientside callbacks
• [x] Mathjax in dcc_markdown and dcc_graph
• [x] Component as props - update: does not work, more info below :x:
• [x] dcc_dropdown search prop and maxHeight
• [x] new prop disable_n_clicks
• [x] dcc_location refresh="callback-nav" - update: does not work, more info below :x:

work in Dash.jl.

[etpinard]

Update

dcc_geolocation just works :heavy_check_mark: :tada: :champagne:

Tested with https://dash.plotly.com/dash-core-components/geolocation translated in Julia as:

see Julia snippet

```jl using Dash app = dash() app.layout = html_div() do html_button("Update Position"; id = "update_btn"), dcc_geolocation(; id = "geolocation"), html_div(; id="text_position") end callback!(app, Output("geolocation", "update_now"), Input("update_btn", "n_clicks")) do click return !isnothing(click) && (click > 1) end callback!(app, Output("text_position", "children"), Input("geolocation", "local_date"), Input("geolocation", "position")) do date, pos isnothing(pos) && return "No position data available" return html_p("As of $date your location was: lat $(pos.lat), lon $(pos.lon), accuracy $(pos.accuracy) meters") end run_server(app, "0.0.0.0", 8080) ```

[etpinard]

Update

dcc_location refresh="callback-nav"

does not work :x:

Translating this "callback-nav" test

see Julia snippet

```jl using Dash app = dash() app.layout = html_div() do dcc_location(; id = "url", refresh = false), dcc_location(; id = "callback-url", refresh = "callback-nav"), html_button("click"; id = "callback-btn", n_clicks=0), html_div(; id = "content") end callback!(app, Output("content", "children"), Input("url", "pathname")) do pathname return if isnothing(pathname) || pathname == "/page-1" html_div("1"; id = "div1") elseif pathname == "/" html_div("base", id = "div0") else "404" end end callback!(app, Output("callback-url", "pathname"), Input("callback-btn", "n_clicks")) do n return if n > 0 "/page-1" else no_update() end end run_server(app) ```

gives

Screencast from 2023-07-11 11-32-18.webm

where the app hangs after pressing the back button.

[etpinard]

Update

Component as props does not work :x:

using Dash

app = dash()

app.layout = html_div() do
    dcc_checklist(; id="checklist",
                  options=[(label=html_h2("H2 label"), value="h2"),
                           (label="plain label", value="plain")])
end

run_server(app, "0.0.0.0", 8080; debug=true)

lead to