Sencha Touch Toggle Button

Here's an example I'm currently using in an app of mine. I use the "beforechange" function to check and validate some data before I perform the real action in "change".

{
    xtype: 'togglefield',
    name: 'toggleName',
    label: 'My Toggle Field',
    listeners: {
        beforechange: function (slider, thumb, newValue, oldValue) {
            if (oldValue == 0 && newValue == 1) {
                // Changing from off to on...validate something?
            }
        },
        change: function (slider, thumb, newValue, oldValue) {
            if (oldValue == 0 && newValue == 1) {
                // Changing from off to on...do something?
            }
            else if (oldValue == 1 && newValue == 0)
                // Changing from on to off...do something?
        }
    }
}