📣 Pattern Matching Callbacks & Dynamic Callback Support - In Development, Looking for Feedback

[Emil]

@Emil

I wanted to try out the PR, so i tried to follow the instructions on how to build here. However, i encounter an issue during the npm run build:js step,

> dash-renderer@1.2.4 build:js /home/emher/Projects/dash/dash-renderer
> webpack --build release

/home/emher/Projects/dash/dash-renderer/webpack.config.js:46
    ...defaults
    ^^^
SyntaxError: Unexpected token ...

Is this a known issue? Or have i done something wrong?

I found out that this issue was related to my installed version of node being to old. To others, who would like to build from source, i would recommend to make sure that node is up to date,

How do I update Node.js?

After updating node, i was able to build with the following commands,

git clone git@github.com:plotly/dash.git
cd dash
git fetch origin pull/1103/head:pr-1103
git checkout pr-1103
python3 -m venv venv || virtualenv venv && . venv/bin/activate
sed -i '/dash-/d' requires-install.txt
pip install -e . --no-cache-dir -r requires-install.txt -r requires-dev.txt -r requires-testing.txt 
. venv/bin/activate && pip install --no-cache-dir --upgrade -e . && mkdir packages
cd dash-renderer && renderer build && python setup.py sdist && mv dist/* ../packages/ && cd ..
git clone --depth 1 https://github.com/plotly/dash-core-components.git
cd dash-core-components && npm ci && npm run build && python setup.py sdist && mv dist/* ../packages/  && cd ..
cd dash-renderer-test-components && npm ci && npm run build:all && python setup.py sdist && mv dist/* ../packages/ && cd ..

I haven’t had time to test much yet, but i can confirm that the immediate problems with wrong/inconsistent callback behavior that i have encountered are fixed by the new logic including the mwe that i reported earlier,

Callbacks not working correctly in dash > 1.6.1

A few people seems to be having issues with callbacks in the recent versions of dash (specifically, newer than 1.6.1), myself included. I have created a MWE that should demonstrate the issue, import dash import dash_core_components as dcc import dash_html_components as html from dash.dependencies import Input, Output, State # Data for selectors. regions = ["DK1", "DK2"] base_years = [2018, 2019] model_index = {region: base_years for region in regions} # Configuration keys. ctrl_ids = [0, 1, 2…