Google Sheets - Make sure cells have a value before executing script - google-apps-script

Question

I want to have a script execute only if all required cells contain information.
The above sheet shows how the layout is. The rows that need to be populated for the script to start are columns B to G
An extra feature that I would also like but is not required is if the user does not fill in all the cells required it will highlight them in red and delete the values in columns H & I of the active row in question.
Below is the script that executes when column H has the value "Completed"
function moveComplete() {
Utilities.sleep(200);
var sheetNameToWatch = "REQUEST";
var columnNumberToWatch = 9;
var valueToWatch = "COMPLETED";
var sheetNameToMoveTheRowTo = "ARCHIVE";
var ss = SpreadsheetApp.getActiveSpreadsheet();
var sheet = SpreadsheetApp.getActiveSheet();
var range = sheet.getActiveCell();
if (sheet.getName() == sheetNameToWatch && range.getColumn() == columnNumberToWatch && range.getValue() == valueToWatch) {
var targetSheet = ss.getSheetByName(sheetNameToMoveTheRowTo);
var targetRange = targetSheet.getRange(targetSheet.getLastRow() + 1, 2);
sheet.getRange(range.getRow(), 2, 1, sheet.getLastColumn()).setDataValidation(null).moveTo(targetRange);
sheet.deleteRow(range.getRow());
var lastrow = sheet.getLastRow();
sheet.insertRows(lastrow, 1);
}
}

Answer 1

You should trigger a checking (depending on what value you need) on all the cells that correspond as a required value with onEdit(). Afterwards, simply trigger your moveComplete() function to populate the rest of the other cells you need.
This Google Docs Help Forum post might give you an idea on how to do it. Just modify some of the code snippets that are already provided there. Other helpful docs:
Google AppScipt Triggers
Google AppScript Event Objects