Value formatter don't working for dash-ag-grid

[AlesiaSel]

@Skiks

Indeed if using your second solution 'valueFormatter': {"function": "'£' + (params.value.toFixed(2))"} raises those errors means you have empty values in your dataset, it seems 34…

To handle empty values, as suggested by @jinnyzor you can set:
'valueFormatter': {"function": "params.value ? '£' + (params.value.toFixed(2)) : null"}
Or set the default value to 0:
'valueFormatter': {"function": "params.value ? '£' + (params.value.toFixed(2)) : '£0'"}

About your first solution, using D3 formatter should handle empty values setting them to 0 by default. The issue is the format you used: .format('£,.2f') that should be .format('$,.2f')

$ here is only to tell you want to use the currency locale (defined in d3.formatLocale() as you did using £ as prefix)

Here are more examples using currencies:

D3 value formatter looks good!!! Thanks