Custom formatting for drop down menu color change.

Hi, 

Being a beginner at Javascript and have been looking and searching for the right code. 

I really hope that you can help me.

I have created a fillable PDF with a dropdown menus. The dropdowns have 3 options and want each option to result in a color.

This is the script I currently have been working on i'm able to get the color to change for "Complete" but not for "In Progress" or "Not Started"

if (event.value=="Complete")

event.target.fillColor = color.green;

else if (event.value=="In_Progress")

event.target.fillColor = color.yellow;

else if (event.value=="Not­_Started")

event.target.fillColor = color.Red;

event.target.fillColor = color.transparent;