JavaScript Enter key function sometimes works and sometimes doesn't

I have a search box which should work with pressing the button and also pressing the Enter key. They both have the same code. The button works perfectly but when it comes to the Enter key, most of the time it doesn't work and sometimes it suddenly works.

Here's my code:

$(document).ready(function() {

  function myFunction() {
    $("#search-criteria").keydown(function(event) {
      if (event.keyCode === 13) {
        var txt = $('#search-criteria').val();
        $('.items:contains("' + txt + '")').addClass('searched');
      }
    });
  }

  $('#search').click(function() {
    var txt = $('#search-criteria').val();
    $('.items:contains("' + txt + '")').addClass('searched');
  });
  
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<form>
  <input type="text" id="search-criteria" onkeydown="myFunction()" name="search" placeholder="Search..">
  <input type="button" id="search" value="search" />
</form>
Answer:1

  1. Remove the inline-event onkeydown you don't need it.

  2. You need to use preventDefault inside your myFunction function.

  3. Remove the classes inside your functions to see clearly the new search result. 

    $(document).ready(function() {
  $("#search-criteria").keypress(function(event) {
    if (event.which === 13) {
      myFunction();
    }
  });

  //code for the button
  $('#search').click(myFunction);
});

var myFunction = function() {
  event.preventDefault();

  var txt = $('#search-criteria').val();

  $('.items').removeClass('searched');
  $('.items:contains("' + txt + '")').addClass('searched');
}
    .searched {
  background-color: green;
}
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

<form>
  <input type="text" id="search-criteria" name="search" placeholder="Search..">
  <input type="button" id="search" value="search" />
</form>


<ul>
  <li class="items">Coffee</li>
  <li class="items">Tea</li>
  <li class="items">Milk</li>
  <li class="items">Coffee</li>
  <li class="items">Tea</li>
  <li class="items">Milk</li>
  <li class="items">Coffee</li>
  <li class="items">Tea</li>
  <li class="items">Milk</li>
</ul>
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