How can I let dropdown list recall the last selected?

Hi, everyone,

Please help me to change my script aim to let the dropdown list recall the last selected.

I want to:

let the script do as same as last thing

I have a script as below:

var myDialog = app.dialogs.add({name:"add continueds",canCancel:true});
with(myDialog){
    with(dialogColumns.add()){
        with(dialogRows.add()){
           var mySelection = dropdowns.add({stringList:["Continued", "continued", "Cont'd","cont'd"], selectedIndex:0});
       }
   }
}

if (myDialog.show() == true)
   
main();
function main(){
var myObject;
var myCheckSelection = false;
if(app.documents.length > 0){
  if(app.selection.length > 0){
   switch(app.selection[0].constructor.name){
    case "InsertionPoint":
    case "Character":
    case "Word":
    case "TextStyleRange":
    case "Line":
    case "Paragraph":
    case "TextColumn":
    case "Text":
    case "Cell":
    case "Column":
    case "Row":
    case "Table":
     myObject = app.selection[0];
  if(app.selection && app.selection[0].hasOwnProperty ("contents") );
      addContinueds(); 
    }
  }
}
else{
  alert("No documents are open or wrong selection. Please try again.");
}
}
function addContinueds() { 
    if (mySelection.selectedIndex == 0){
   app.findGrepPreferences.findWhat = "(.)\\r";
   app.changeGrepPreferences.changeTo = "$1 (Continued)\\r";
   app.selection[0].changeGrep();
   app.findGrepPreferences = app.changeGrepPreferences = null;
    }
    if (mySelection.selectedIndex == 1){
   app.findGrepPreferences.findWhat = "(.)\\r";
   app.changeGrepPreferences.changeTo = "$1 (continued)\\r";
   app.selection[0].changeGrep();
   app.findGrepPreferences = app.changeGrepPreferences = null;
    }
   if (mySelection.selectedIndex == 2){
   app.findGrepPreferences.findWhat = "(.)\\r";
   app.changeGrepPreferences.changeTo = "$1 (Cont'd)\\r";
   app.selection[0].changeGrep();
   app.findGrepPreferences = app.changeGrepPreferences = null;
    }
  if (mySelection.selectedIndex == 3){
   app.findGrepPreferences.findWhat = "(.)\\r";
   app.changeGrepPreferences.changeTo = "$1 (cont'd)\\r";
   app.selection[0].changeGrep();
   app.findGrepPreferences = app.changeGrepPreferences = null;
    }
}

for do some tedious works, but it has some options, how can I add something to it aim to tell the script I want to do something as previous choice?

I expected it can remember the last what I do. and then do as same as previous jobs.

like I want to repeat one job again and again

I add a recall template into it, but I don't know how can I make it happen?

var myDialog = app.dialogs.add({name:"add continueds",canCancel:true});
with(myDialog){
    with(dialogColumns.add()){
        with(dialogRows.add()){
           var mySelection = dropdowns.add({stringList:["Continued", "continued", "Cont'd","cont'd"], selectedIndex:0});

//---------------------------------------------------------------------------------------- -------------------------------------------------------------
//   I add (a template) into here, but how can make it happen?

my $menu=$q->popup_menu(
            -name=>"templates",
            -id=>"templates",
            -values=>["",23,36],
            -labels=>{""=>"Select . . .",23=>"Text One",36=>"Text Two"
+}
//---------------------------------------------------------------------------------------- -------------------------------------------------------------

           );

       }
   }
}

if (myDialog.show() == true)
   
main();
function main(){
var myObject;
var myCheckSelection = false;
if(app.documents.length > 0){
  if(app.selection.length > 0){
   switch(app.selection[0].constructor.name){
    case "InsertionPoint":
    case "Character":
    case "Word":
    case "TextStyleRange":
    case "Line":
    case "Paragraph":
    case "TextColumn":
    case "Text":
    case "Cell":
    case "Column":
    case "Row":
    case "Table":
     myObject = app.selection[0];
  if(app.selection && app.selection[0].hasOwnProperty ("contents") );
      addContinueds(); 
    }
  }
}
else{
  alert("No documents are open or wrong selection. Please try again.");
}
}
function addContinueds() { 
    if (mySelection.selectedIndex == 0){
   app.findGrepPreferences.findWhat = "(.)\\r";
   app.changeGrepPreferences.changeTo = "$1 (Continued)\\r";
   app.selection[0].changeGrep();
   app.findGrepPreferences = app.changeGrepPreferences = null;
    }
    if (mySelection.selectedIndex == 1){
   app.findGrepPreferences.findWhat = "(.)\\r";
   app.changeGrepPreferences.changeTo = "$1 (continued)\\r";
   app.selection[0].changeGrep();
   app.findGrepPreferences = app.changeGrepPreferences = null;
    }
   if (mySelection.selectedIndex == 2){
   app.findGrepPreferences.findWhat = "(.)\\r";
   app.changeGrepPreferences.changeTo = "$1 (Cont'd)\\r";
   app.selection[0].changeGrep();
   app.findGrepPreferences = app.changeGrepPreferences = null;
    }
  if (mySelection.selectedIndex == 3){
   app.findGrepPreferences.findWhat = "(.)\\r";
   app.changeGrepPreferences.changeTo = "$1 (cont'd)\\r";
   app.selection[0].changeGrep();
   app.findGrepPreferences = app.changeGrepPreferences = null;
    }
}

guys help me please!

John