Question

I’ve got a label in my mxml like this;

   <s:Label id="lblChange" text="{_symbol.change>0 ?  '+' + _symbol.change:_symbol.change}" />

This works perfectly fine, but I need to replace the binding via curly brackets with BindingUitls, something like this;

_changeWatcher = BindingUtils.bindProperty(lblChange, "text", _symbol, "change");

Again, works fine, but without the if/else case. So I though I could just write a function to do that;

private function checkValue(val:Number):String {
    if (val > 0)
        return "+"+val;
    else
        return val as String;
}

and use it as a property in the bindProperty call instead of change;

.bindProperty(lblChange, "text", _symbol, checkValue(_symbol.change));

However, bindProperty seems to accept nothing but strings here. So what way is there to get around this ‘feature’?

Answer 1

Try this:

BindingUtils.bindSetter(checkValue, _symbol, "change");

private function checkValue(object:Object):void {
    var val:Number = object as Number;
    if (val > 0)
        lblChange.text = "+"+val.toString();
    else
        lblChange.text = val.toString();
}