Invoke function through Key Press Event

I do know Javascript or Photoshop scripting well I only hack at it and modify script code the others write.  I steal(reuse) their code to do what I want to automat in Photoshop.  I create a script Paste Image Roll.  The dialog has  input fields for numeric data.  I stole some code from A script I believe Michel Hale posted here years ago the  install and event listener for keyboard input to onle allowed  0 through 9 and I think "."  and some special keys. http://www.mouseprints.net/old/dpr/PasteImageRoll.jsx

The listener event is added in the scripts Dialog and  there is code that handles the keydown events. In these dialog fields Invalid input is rejected with a beep.

Re: Script Request??

To stay open I believe you would need to make it an Photoshop extension.   I have more or less done that without creating a extension.  I created a Pallet Window via ScriptUI and launch the script via the Photoshop extension JSX Launcher.  The script  run seems to stay open because it was launch from a Photoshop extension And Photoshop UI is available for use.

var p = new Window( "palette" ,"JJMack PS Palette");
p.btn = p.add( "button", undefined,'Actual' );
p.btb = p.add( "button", undefined,'Zoom out' );
p.btc = p.add( "button", undefined,'Zoom in' );
p.cls = p.add( "button", undefined, "Close Palette");
customEventManager = {
  events: {},
  addListener: function( evt, handler, context ) {
    if ( !this.events[ evt ] ) {
      this.events[ evt ] = [];
    }
    this.events[ evt ].push( { "handler": handler, "context": context } );
  },
  trigger: function( evt ) {
    if ( this.events[ evt ] ) {
      for ( var i = 0; i < this.events[ evt ].length; i++ ) { 
        this.events[ evt ][ i ].handler.call( this.events[ evt ][ i ].context, evt );
      }
    }
  }
}
 p.btn.onClick = function() {
  p.evt.trigger( "Actual" );
}
p.btb.onClick = function() {
   p.evt.trigger( "Out" );
}
p.btc.onClick = function() {
   p.evt.trigger( "In" );
}
p.cls.onClick = function(){
   p.close();
 };
aHandler = function( evt) {
if (documents.length!=0) {runMenuItem(app.charIDToTypeID("ActP"));}
}
 bHandler = function( evt) {
if (documents.length!=0) {runMenuItem(app.charIDToTypeID("ZmOt"));}
}
 cHandler = function( evt) {
if (documents.length!=0) {runMenuItem(app.charIDToTypeID("ZmIn"));}
//alert( evt );
}
p.evt = customEventManager;
p.evt.addListener( "Actual", aHandler );
p.evt.addListener( "Out", bHandler );
p.evt.addListener( "In", cHandler );
  
p.onShow = function(){  
  var ww = p.bounds.width;  
  var hh = p.bounds.height;  
  PaletteDisplay = 0;                                         // Photoshop's First Display 
  //PaletteDisplay = $.screens.length-1;                        // Photoshop's Last Display 
  PaletteTop   = $.screens[PaletteDisplay].top + 100;         // Relative to Top of display
  PaletteLeft  = $.screens[PaletteDisplay].right - ww - 46 ;  // Relative to Right of side not Left side of display
  p.bounds.x  = PaletteLeft;  
  p.bounds.y  = PaletteTop;  
  p.bounds.width  = ww;  
  p.bounds.height  = hh;  
}   
//alert($.screens)
p.show();