About Input Search History Listing

// Search history array
var history_list = [ ];

function fake_search(){
  // Retrieve and clear search terms
  varsword=$("#s_words").val();
  $("#s_words").val("";
  
  // Add if not already registered
  if(0>$.inArray(sword, history_list)){
    // Add history to Suggest
    $("#search_history").append($("<option>").val(sword));
    // Add to word list
    history_list.push(sword);
  }
  
  alert("Pseudosearched.\n Added words and phrases to search history.");
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type="search" id="s_words" name="s_words"placeholder="Please enter a search term." list="search_history"/>
<button onclick="fake_search();">Search</button>
<datalist id="search_history">
</datalist>