Type of parameter for called function

Question

Hi,

I'm working of webform which have multiple html controls.

 

html

<div>
  <label for="ddlJobType">Job Category</label>
  <select id="ddlJobCategory" class="form-control" onchange="getselectedVal(this);"></select>
  <label for="ddlJobType">Job Type</label>
  <select id="ddlJobType" class="form-control" onchange="getselectedVal(this);"></select>
</div>

What parameter should be send to the called function? is parameter 'this' an efficient way?

 

jQuery 

function getselectedVal(**what should be the argument type**){
  alert('dropdown option:selected').val();
}

I want to use the same function to give details of selected dropdown value. What should be the parameter type to access the selected html control.