Edittext onChange has undefined value?

[annaforrest]

I'm trying to add validation to my edittext controls.  I need to make sure they are always numeric values.  I've seen a number of posts indicating various methods for accomplishing this, but my edittext control is always returning an 'undefined' value regardless of whether I add a number or a letter.  I can see the correct value in the debugger's view of the control, but the code fails.  Can anyone please tell me what I'm doing wrong here?

CreateDialog.prototype.run = function()
{
     // declare a bunch of vars
   
    // Create a window of type palette.
    var win = new Window("dialog", "Element Spray Generator",[iTop,iLeft,iTop + iWidth,iLeft + iHeight] );  // bounds = [left, top, right, bottom] 
    this.windowRef = win;

     // add a bunch of other stuff...

    win.txtEditScaleJitter = win.btnPanel.add("edittext",[win.btnPanel.bounds.width/5*4-iPadding, win.txtScaleJitter.bounds.top, win.btnPanel.bounds.width-iPadding, win.txtScaleJitter.bounds.bottom], "100%")

    //Textbox events
    win.txtEditScaleJitter.onChanging = function() {

     //****  here win.txtEditScaleJitter.text is always undefined ******

        var testCharacter = win.txtEditScaleJitter.text.charAt(win.txtEditScaleJitter.text.length -1);
         switch(testCharacter ){
             case "0":  case "1":   case "2": case "3":case "4": case "5":case "6":case "7":case "8": case "9": break;
             default: alert("You entered a character that is not a number  --> " + testCharacter + " <--"); break;
        }
               
    };

   
    // Display the window
    win.show();
       
    return true;   
}

[Michael_L_Hale]

Tom,

What I think we really need is a numeric input control or at least a creation property for edittext so it will only accept numbers. That way we wouldn't need keyboard handlers for this kind of thing.

[xbytor2]

Wanting to accept numbers can mean a lot of different things. Handling digits is relatively easy. When you have to deal with

floating point numbers, things get a bit gnarly because of localization issues. A decimal mark can be any of ".,-/" and mixing

in digit grouping separators just makes matters worse.

For what it's worth, I'm using this sort of code for keystroke filtering:

function filterKey(event) {
  var obj = event.currentTarget;
  var filter = obj.keyFilter; // a RegExp
  var c = Number("0x" + event.keyIdentifier.substring(2));
  var key = String.fromCharCode(c);
  if (filter && key.match(filter)) {
    return;
  } else if (event.keyName.length == 1) {
    // bail if it was a simple character that we couldn't match
    event.stopPropagation();
    event.preventDefault();
  }
};
function addNumericFilter(obj) {
  obj.keyFilter = /\d/;
  obj.addEventListener('keydown', filterKey);
};
//...
   addNumericFilter(pnl.textField);

It has the (dis)advantage of using RegExp for filtering, but it makes it easy to add new keystroke filters and gets around some of the issues of using onChanging.