javascript - How to populate input text fields with values from database on checkbox clicked

I am trying to automatically populate multiple input text fields with the values of variables returned from SELECT query on click checkbox event. For example: the SELECT query returns Warehouse Street Address ($WarehouseStreetAdress). Then after checking the checkbox "Use the Warehouse Street Address"this address should be entered into input text field. I have the following code:

$WarehouseStreetAddress = $_POST['WarehouseStreetAddress']; ...Select query works fine...
<input id="checkbox" type="checkbox"> Use Warehouse Address<br>
Street Address: <input id="StreetAddress" type="text">
$("#checkbox").change(function() {
if (this.checked) {
var StreetAddress= $WarehouseStreetAdress;
}
$("#StreetAddress").val(StreetAddress);
}