How do I restrict a trigger to a specific sheet/tab?

Question

I have written a script in google sheets that will change the time stamp in the selected cell anytime the entire spreadsheet is updated at all. However, I need the timestamp

Answer 1

This is what you are looking for :

function onEdit(e) {

  var row = e.range.getRow();
  var col = e.range.getColumn();
  if ( e.source.getActiveSheet().getName() === "Input" && (row==1 && col==1) ){
 e.source.getSheetByName('Board').getRange('A28').setValue(new Date())      
  }
}