Last updated stamp
onEdit sets the cell in column F on the same row to new Date() when column D changes to Done.
What is setValue in Google Sheets Apps Script?
setValue writes a single value into one cell on a Range object. Pass a string, number, boolean, or Date and Apps Script stores it in the grid. It is the simplest write operation and appears constantly in triggers, menus, and small automations that update one field at a time.
When to use it
Use setValue for single-cell updates: stamp a timestamp, flip a status flag, write a computed ID into one cell, or clear one field with an empty string.
When to skip it
Skip setValue when updating many cells. Build a 2D array and use setValues once. Repeated setValue calls in large loops are slow and can hit execution limits.
How it works
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1
Get a Range with getRange('E5') or offset from a known row.
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2
Call range.setValue(value) with the data you want stored.
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3
JavaScript Date objects usually become proper date values in the cell.
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4
Use setNumberFormat after setValue if display format matters for your team.
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5
In onEdit, avoid writing back to e.range without checking oldValue to prevent loops.
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6
Test on a copy because script writes do not Undo with Ctrl+Z.
Examples in Google Sheets
Reset a control cell
After processing, setValue on Settings!A1 back to READY so the next menu run knows the job finished.
Write an error message
catch block calls getRange('B1').setValue('API failed at ' + new Date()) for a visible status on the Dashboard tab.
Build this without starting from a blank cell
Use a Better Sheets tool for setValue, then watch a walkthrough when you want the full pattern.
Better Sheets resources
Common mistakes
- setValue inside a loop over thousands of rows instead of batching with setValues.
- Writing to the trigger cell in onEdit without guards, causing infinite re-fires.
- Passing a string when the sheet expects a number, breaking downstream SUM formulas.
- Overwriting formula cells with setValue and deleting logic users relied on.
- Using setValue on merged cells in ways that confuse which master cell receives the value.
Frequently asked questions
- What is the difference between setValue and setValues?
- setValue writes one cell. setValues writes a 2D array to a matching rectangular range in one call.
- Can setValue write a formula?
- Yes. Pass a string starting with = and Sheets stores it as a formula. setFormula is clearer when you only set formulas.
- How do I clear a cell?
- Call setValue('') or clearContent on the range. clearContent also removes formatting.
- Does setValue trigger onEdit?
- Yes, when a user-visible edit path runs. Script writes from the same onEdit handler can re-fire the trigger if you are not careful.
- Can setValue set a checkbox?
- Pass true or false boolean for checkbox cells formatted as checkboxes.
- Why is my date wrong?
- Timezone and Date object time can shift display. Set timezone in script settings or write a date-only value intentionally.
- Can setValue run in simple onOpen?
- Yes. Simple triggers can write cells. Restricted services still need installable triggers and authorization.
- How do I set value and note together?
- Use setValue for the cell and setNote on the range for a comment. They are separate calls.
Related Tutorials
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Related blog posts
Guides that explain setValue in more depth.
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Read post →Related glossary terms
onEdit trigger
The onEdit trigger runs a script automatically when someone changes a cell in your spreadsheet. It is one of the simplest ways to make Sheets react to user input without clicking a custom menu. You define the function in Apps Script and bind it to the onEdit event for that file.
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.
Read guide →Apps Script loops
Loops in Apps Script let you repeat code over rows, columns, sheets, or API pages. You read ranges into arrays with getValues(), process each item in a for or forEach loop, then write results back in one setValues() call when possible. Batch reads and writes beat cell-by-cell updates for speed and quota limits.
Read guide →Google Sheets automation
Automation means work happens without repeating the same clicks every day: imports update, emails send, rows move, and dashboards refresh. In Sheets, automation usually stacks built-in features, Apps Script, and sometimes the Sheets API or add-ons. Start with the lightest tool that still solves the job.
Read guide →Done reading about setValue?
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