Como contar campos de texto ocupados en formulario.

You can do it using this code:

var count = 0;
for (var i=0; i<this.numFields; i++) {
	var fname = this.getNthFieldName(i);
	var f = this.getField(fname);
	if (f==null) continue;
	if (f.type=="text" && f.valueAsString!="") count++;
	if ((f.type=="checkbox" || f.type=="radiobutton") && f.valueAsString!="Off") count++;
}
app.alert("Number of filled-in fields: " + count,3);