Use onEdit() to run client function in Google Apps Script web-app -

i have google apps script i've published web app.

it's working fine - getting , updating data in spreadsheet.

i'd if spreadsheet edited while web app page open in browser can reload data (to changes.)

how can call client-side javascript function onedit() event handler?

or can display message user tell them reload page. (apparently can't reload them: google apps script location.reload in web app )

would need simple event handler, or installed?

a hack-y way reload data every 20 minutes, i'd used on mobile devices, might use data!