Applying "Automatic" number formatting
Is it possible to apply the 'Automatic' number format programmatically through GAS? My issue is that as I write columns of numbers, Sheets seems to attempt to apply appropriate formatting, but gets it wrong sometimes. That is, particular small integers (1 sometimes) will be formatted as dates. The range is being written in one
myRange.setValues() method and I can't see any pattern to the mistakes and therefore don't see any way to prevent the surprise mis-formatting.
But, when I select the range in sheets and just click "Automatic" on the number format menu all returns to normal. It doesn't help to click that upfront as the writing of data somehow resets the format.
Despite the long-winded intro, my question is very simple: how to programmatically apply "Automatic" number formatting. I'm thinking this is very basic, especially since google and searches here have been no help.
My current fallback solution is to use
myRange.setNumberFormat("0") as the format for the whole range. This is not ideal as some numbers are very large and are easier to read in scientific notation. There are also some text strings in the range, but these format properly regardless of format applied. I also would prefer to avoid having to iterate through the data and test for values to determine the best format, when it's just a couple clicks in the user interface.
we can use
Below is the example:
var spreadsheet = SpreadsheetApp.getActive(); spreadsheet.getRange("B:B").setNumberFormat("General");
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copyFormatToRange to copy/apply Automatic format:
var ss = SpreadsheetApp.getActiveSpreadsheet(); var sheet = ss.getActiveSheet(); var source_cell = sheet.getRange("A1");//A1: cell having automatic format source_cell.copyFormatToRange(sheet,1,1,2,2);//copy format of cell A1 to cell A2
You can write an API that opens another spreadsheet, read any cell that having the automatic format.
var ss = SpreadsheetApp.openById(SpreadsheetId);//Id of another spreadsheet
copyFormatToRange to your wanted cell.
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If you don't have dates in the range, the below solution appears to be the best available option (without resorting to an API-based solution):
A zero-point-15x'#' seems to be a 'magic' number format that will allow very large numbers to show as scientific notation and smaller integers and decimals to show in the 'standard' format pre-application of number formatting. This is also the format that is returned for cells that contain non-dates formatted with the 'Automatic' selection in the user interface.
Adding or removing even one
# will 'break the spell' and cause very large numbers to display in non-scientific notation. I also tested changes before the decimal place, but leaving the 15x#:
So there is some flexibility for prefixes.
0 is evidently required.
This turns numbers red, but breaks the 'magic' formatting. So no suffixes it appears.
Again, if you have dates in the range, this will not work as they will, not surprisingly, display as the underlying number. And potentially more problematic (but totally understandable), the only way to return them to date form is manually applying a date format, assuming you know which cells 'were' dates.
Complete replication of 'Automatic' number formatting requires traversing the range to find dates and apply desired date format, but otherwise applying the 'magic' format. (My original dataset was a mix of numbers and strings, so the simple approach given above works.)
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- This is a really good question, and something that is definitely not documented. Closest I could find was stackoverflow.com/questions/13758913/… which only really overs plain text.
- Really appreciate the comment. I searched and searched on this for nearly a week thinking that I must be missing something obvious. The only suspicion I have left is that "Automatic" formatting is the absence of any number formatting, but my efforts to assign
undefinedhave been totally unsuccessful.
myRange.setNumberFormat((typeof undefined)); // or just 'undefined'turns a cell with a
0into: 'un301899fin189930' -- that is, it's parsing
undefinedas a string and then valiantly trying to format the cell as a date.(?) Passing
nullthrows a server error.
- And if anyone else is wondering
myRange.setNumberFormat("");does not work. It simply hides all numbers (and dates). Strings still show normally. Just like if you placed
""into the custom number format box in the user interface.
- It's good to note that this will not set it to automatic to reader's looking for a Tl;Dr. I discovered this before i made my earlier comment. Hope someone can puzzle it out, or show proof of it being impossible.
- Thanks. Hard to put yourself in others' shoes when writing. Updated to make more clear the limitations of the approach. The link you cited in your earlier comment was also interesting and led me to research more Java documentation on number formatting. There may be more answers there for particular situations, but I did not see any mention of a way to trigger automatic formatting in Java, in the hopes that the method would also work here.