What is modeless dialog in Google Sheets?
Modeless Dialog is Apps Script project vocabulary around deployments, triggers, authorization, and the script editor. These concepts sit above individual API methods documented on Better Sheets snippet pages.
When to use it
Use Apps Script concepts when you automate Sheets beyond formulas: menus, web apps, triggers, and deployments.
When to skip it
Skip custom scripts when macros, formulas, or an add-on already cover the workflow with less maintenance.
Better Sheets resources
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Google Apps Script
Apps Script is Google's JavaScript platform for automating Sheets and other Workspace apps. From a spreadsheet you can open Extensions > Apps Script to write code that reads cells, sends email, builds menus, and runs on triggers. It goes beyond formulas when you need custom workflows tied to your file.
Read guide →Script Editor
The Script Editor is the Apps Script workspace inside your spreadsheet where you write JavaScript that talks to Sheets, Gmail, and other Google services. You open it from Extensions > Apps Script. Every function you save can be run manually, bound to a trigger, or linked from a custom menu.
Read guide →Apps Script triggers
Triggers tell Apps Script when to run a function: on edit, on open, on a schedule, or when a form is submitted. Simple triggers use reserved names like onEdit. Installable triggers are created in the Apps Script Triggers page and can do more, including running as a specific user or on a timer.
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