Change Event : Change Drop Down Value based on Numeric Field

The change event is called each time the user presses a key when the field has the focus. It's basically a keystroke event. This event is not called if the field value is modified in some other way. For example by importing data or from a script. If you want the dropdown field modified only under these conditions then the change event is a good choice.

The "this.rawValue" property does not show the changed value. The newly entered data is in the event object.
For example:

if(Number(xfa.event.newText) > 1)
{
...
}

Alternatively you could use the validate event, which is called when data is committed to the field. But you'll need to return a true false value, because that's what Acrobat expects from the validate event. Unless you need to do real validation just put "true;" as the last line of the script.

If I understand you correctly:

if(Number(xfa.event.newText) > 1)
{
fldEnvelopeOrderColor[0].event.value = "Yellow";
}
else if(Number(xfa.event.newText) < 1)
{
fldEnvelopeOrderColor[0].event.value = "";
}

xfa.event.newtext will show the new data in the number field so I changed that. And also the true statement needs an event.value to tell it what the new value should be. It currently doesn't have a default value.

I think I'm getting closer but I'm not there yet.

Thanks.

The xfa.event.newText property contains full text of the data the user is entering into the number field.

To change the value of your dropdown use the "rawValue" property. Like this;

if(Number(xfa.event.newText) > 1)
{
fldEnvelopeOrderColor.rawValue = "Yellow";
}
else if(Number(xfa.event.newText) < 1)
{
fldEnvelopeOrderColor.rawValue = "";
}

For a LiveCycle JavaScript, the instance index of the form element cannot be used in the SOM path. If you have more than one instance of the same element you'll need to access it using the resolveNode function.