How to return 'null' instead of 'undefined' from select element

Question

How can I return null instead of a 'undefined' from a select element. Basically I have 4 selects at the moment, but only the first one is populated with data at this point, but I want to grab the value from all of them when working with them. ``` ``` JQuery: ``` $('.changeValue').change(function() { var data = {}; data["Id1"] = $('#drpOne:selected').attr("id"); data["Id2"] = $('#drpTwo:selected').attr("id"); ``` In this case, drpTwo will return 'undefined'. Is there anyway to get a null instead?

Accepted Answer

Use the `or` operator `||`:

```
data["Id2"] = $('#drpTwo:selected').attr("id") || null;
```

How to return 'null' instead of 'undefined' from select element

Solution

Problem