Google Sheets - Create Data Validation - google-apps-script

Question

I need to create several hundred data validation dropdowns that will refer to different ranges.
Dropdowns needs to be created in each cell of sheet1, in column 'O'.
However each dropdown has to refer to a different row in another sheet ('sheet2').
For example:
data validation dropdown in 'sheet1', cell 'O2' will refer to an entire row 1 in 'sheet2'
dropdown in 'sheet1', cell 'O3' will refer to a row 2 in 'sheet2', and so on.
Data validation setup:
List from range, show dropdown list in a cell, reject input.
I'd appreciate if you guys could help out with a script that will create predefined number of such dropdowns in a column.
regards,

Answer 1

You can use this sample code:
function createDataValidation() {
var ss = SpreadsheetApp.getActiveSpreadsheet();
var s1 = ss.getSheetByName("Sheet1");
var s2 = ss.getSheetByName("Sheet2");
var s2_lastRow = s2.getLastRow();
//create data validation per row
for (var row = 1; row <= s2_lastRow; row++){
//create an a1Notation to select a complete row sample: "A1:1", "A2:2", and so on.
var a1Notation = "A"+row+":"+row;
//create data validation rule
var listRange = s2.getRange(a1Notation);
var rule = SpreadsheetApp.newDataValidation()
.requireValueInRange(listRange, true)
.setAllowInvalid(false)
.build();
//assign rule to the current cell in sheet1 column "O"
//add 1 row offset since data validation will start at cell "O2"
a1Notation = "O"+(row+1);
Logger.log(a1Notation);
var cell = s1.getRange(a1Notation);
cell.setDataValidation(rule);
}
}
What it does?
Get individual sheets using Spreadsheet.getSheetByName(name)
Get Sheet2's last row number using Sheet.getLastRow()
Loop each individual row in Sheet2
Create an a1Notation string for the current row using this format (row1: "A1:1")
Select a range to be used for the data validation using Sheet.getRange(a1Notation)
Create a new data validation rule using SpreadsheetApp.newDataValidation(). This will return a DataValidationBuilder where you can specify what type of data validation to use. For Values in Range, use DataValidationBuilder.requireValueInRange(range, showDropdown)
Regarding rejecting inputs, by default new data validation rules set it to true. See DataValidationBuilder.setAllowInvalid(allowInvalidData)
Set newly created data validation rule for a specific cell using Range.setDataValidation(rule)
OUTPUT:
Sample Sheet2:
Sample Output Sheet1: