How to select a form option using SWIFT -

im trying figure out how select option in website using swift. website code.

<form name="form1" method="post" action="">     <p align="center">select pay period:         <select name="selpp" onchange="form1.submit()">          <option value="132016"  >132016</option>          <option value="142016"  >142016</option>          <option value="152016"  >152016</option>          <option value="162016"  >162016</option>          <option value="172016"  >172016</option>          <option value="182016" selected="selected" >182016</option>          <option value="192016"  >192016</option>          <option value="202016"  >202016</option>          </select> 

i had tried add "selpp=192016" @ end of post request loads default selected option. i've seen questions relating javascript not in swift. need know format of how submit form select option.

im trying use javascript make form selection. have code before load request still doesn't work. self.webview.stringbyevaluatingjavascriptfromstring("document.getelementbyid('selpp').selectedindex = '202016';")