Clientside callback example with .js function throws “cannot read property ‘apply’ of undefined” error

Dash Python
6

Thanks, I tried your solution, but still it does not work – I suspect it’s something on my localhost server (ubuntu 20.04) that I apparently don’t know how to address.
However, the example works just fine when I embed the js code in the callback like this:

app.clientside_callback(
    """
    function(value) {
        return 'Client says:: "' + value + '"';
    }
    """,
    output = Output('output - clientside', 'children'),
    inputs = [Input('input', 'value')],
)