onchange pass select value via function
HTML
<select onchange="getVal(this.value)">
<option value="PAK">Pakistan</option>
<option value="KSA">Saudi Arabia</option>
<option value="TUR">Turkey</option>
<option value="EYG">Egypt</option>
</select>
<script>
function getVal(val){
console.log(val);
}
</script>