title: Auto select value of dropdown
body: <p>How can I auto select a field in dropdown.</p>
  
  <p>Say if someone goes to <code>www.xyx/form/?abc</code>
  Some value gets selected in the dropdown, </p>
  
  <p>Or if someone goes to <code>www.xyx/form/?def</code>
  Some other value gets selected in the dropdown.</p>
  
  <p>I am comfortable with JS and php.</p>