Auto populate multiple fields from Drop Down Selection

Good Morning, 

I am hoping for assistance with the below scenario. Upon selection of name the 3 fields autopopulate:

The javascript I entered isn't working. I also have not entered a reset form code, is this necessary? Below is what I have attempted:

var PoistionTitle = "";
var PositionNo = "";
var ApproverID = "";

if ( event.value == "Hopkins, Rachael"){
PositionTitle = "PCS";
PositionNo = "123456";
AproverID = "1111111"

} else if ( event.value == "Perry, Mark"){
PositionTitle = "PCS";
PositionNo = "789123";
AproverID = "222222"
}
else if ( event.value == "Mitchell, Ellis"){
PositionTitle = "PCO";
PositionNo = "999999";
AproverID = "333333"
}

{
this.getField("PositionTitle").value = PositionTitle;
this.getField("PositionNo").value = PositionNo;
this.getField("ApproverID").value = ApproverID;
}

Any guidance would be greatly appreciated.