How to check if the user didnt input any value in prompt box in Google Sheets

Question

What can I use to know if there was no input in a prompt? Already tried the < "" > but doesnt seem to work for this case.

Answer 1

You can simply check if the response text is an empty string:

var ui = SpreadsheetApp.getUi();
var response = ui.prompt('Enter your name:');
console.log(response.getResponseText()=="")

if response.getResponseText()=="" is true, it means there was no input given.