Use example of client side callbacks doesn't work

Dash Python
2

First, please utilize appropriate markdown so your code is easy to read.

I was able to make your client_side_simple.py work (using the most recent - aka today’s version - of Dash) but I modified the .js file as shown below:

if(!window.dash_clientside) {window.dash_clientside = {};}
window.dash_clientside.clientside = {
    display: function (value) {
        return 'Client says "' + value + '"';
    }
}

This change was taken directly from 📣 Dash 0.41.0 released