Array of textfields - why doesnt this work?

1

I’ve got 4 input text fields used for inserting numbers. (i’m making a math addition app for children) When each column is added up and the number inserted in the text box in the same column (working from right to left) it compares that number with the actual number and will display either a tick or cross.

e.g

Answers in text fields:

1 2 3 4

var comparetime: 1234

If textfield0 (which is 4) is equal to comparetime.length-1 (which is 4) then a tick will appear.

Now i thought this code would work, the theory is right, but for some reason it’s not even entering the onKeyUp function.

[AS]
for(var i:Number = 0; i < 4; i++)
{
var mc:TextField = this[“t”+i];

mc.onKeyUp = function():Void
{

//for test purtposes
testxt.text = "wooooo!! " + this._name;

    switch(this._name.substring(1)) {
        case 0:
            //if ((this.text != null) && ((comparetime.substring(comparetime.length-1)) != null)) {
                if (this._name.text == comparetime.substring(comparetime.length-1)) {
                    _root.attachMovie("tick", "tick", 200);
                    tick._x = 34;
                    tick._y = 45;
                } else {
                    _root.attachMovie("cross", "cross", 200);
                    cross._x = this._x;
                    cross._y = this._y + 30;
                }
            //}
        break;
        case 1:
            //if ((this.text != null) && ((comparetime.substring(comparetime.length-2)) != null)) {
                if (this.text == comparetime.substring(comparetime.length-2)) {
                    _root.attachMovie("tick", "tick", 201);
                    tick._x = 56;
                    tick._y = + 30;
                } else {
                    _root.attachMovie("cross", "cross", 201);
                    cross._x = this._x;
                    cross._y = this._y + 30;
                }
            //}
        break;

[/AS]