Google Sheets Script to Rearrange Rows - google-apps-script

Question

Trying to create a Google Sheet that allows selection of row priority with dropdown selection option.
Here's a basic algorithm that I am trying to build out:
1 User changes the priority of the row using the dropdown (Note: That part works fine)
2 The edited row will move up to the position based on the new priority (Note: That part works fine)
3 All other rows will change their numbers based on the edited cell (i.e. Say, the edited cell was originally 13 and changed to 4. I want the old 4 to become 5 and everything from 5 to 12 to increase 1)
The issue I'm having is when the cell is changed to number 4, it goes under the old number 4 - hence a for loop doesn't work.
Anyone done anything similar or have suggestions?
function onEdit(event) {
var activeSheet = SpreadsheetApp.getActiveSheet();
var editedCell = activeSheet.getActiveCell();
var columnToSortBy = 1;
var tableRange = "A2:M22";
if(editedCell.getColumn() == columnToSortBy){
var priority = editedCell.getValue();
var range = activeSheet.getRange(tableRange);
var time = new Date();
time = Utilities.formatDate(time, "GMT", "HH:mm:ss");
var nextCell = editedCell.offset(0, 13);
nextCell.setValue(time);
range.sort({ column: columnToSortBy, ascending: true});
}
}
function rearrangeRows() {
var i;
var ss = SpreadsheetApp.getActiveSheet();
var startRow = 1;
var endRow = ss.getLastRow();
var getRange = ss.getDataRange();
var getRow = getRange.getRow();
var testPriority = 3;
var cell = ss.getRange("A4");
var cellValue = cell.getValue();
if (cellValue > number) {
Logger.log(cellValue);
}
Logger.log(number);
// for(i; i > )
}

Answer 1

I think you could put code like what I've written below in the onEdit function, before you sort the spreadsheet. This should increase the value of all the cells with a priority higher than the priority you just set, ignoring the cell you just changed. You may have to adapt it slightly to work also when you decrease the priority of a row, as you'll want to decrease the priority of all the rows in between the row's original priority and its new priority.
var endRow = activeSheet.getLastRow();
for (var i = 1; i <= endRow; i ++) {
var currentCell = activeSheet.getRange("A" + i);
if (currentCell.getValue() > priority && i != editedCell.getRow()) {
currentCell.setValue(currentCell.getValue() + 1)
}
}