Populating text from dropdown menu

I have a dropdown menu, that when an item is selected a description appears in a text box from the selection in the dropdown list. This is the script I already have, but it only shows for the first item in the dropdown list. I need help getting the text field to show from every selection in my dropdown list.

var v = event.value;

var targetValue = "";

if (v == "Appliance Repair")'

{

     targetValue = "Text";

}

else if (v == "Carpet Repair")

{

     targetValue = "Text2";

}

this.getField("Description").value = targetValue;