Below is the JavaScript code for real-time article suggest in your Desk.com support center contact form. This is to be placed within your theme's "Email (New)" section of Advanced Themes within Desk.com Admin.

gistfile1.html

<div id="autosuggest" style="display: none;"></div>
<div id="common">
  <h4>Common Questions</h4>
  <p>This will show on page-load and if no results are found based on what the user is typing. You can optionally put links to common articles here.</p>
</div>

<script>
var as_count = 0;

$(function() {

  // Skip pre-create
  $('#new_email').attr('action','/customer/portal/emails');

  // Real-time auto-suggest
  $('#email_subject').on("keyup paste",function() {
    if ($('#email_subject').val().length > 3 && $('#email_subject').val().length <= 250) {
      clearTimeout(window.timer);
      window.timer=setTimeout(function(){ // setting the delay for each keypress
        articleSuggest();
      }, 500);
    }
  });
  
});

articleSuggest = function() {
  as_count = 0;
  var search_query = $('#email_subject').val();
  var systemLanguageDesk = '{{system.language}}';
  
  $.ajax({
    url: '//' + document.domain.toString() + '/customer/' + systemLanguageDesk + '/portal/articles/autocomplete?term=' + search_query,
    dataType: 'json'
  }).done(apiSuccess).fail(apiFail);

}
  
apiSuccess = function(data) {
  auto_suggest_content = "";
  auto_suggest_articles = "";
  auto_suggest_questions = "";
  $('.autosuggest').html('<h2 class="muted">Do these help?</h4><ul class="unstyled"></ul>');
  $.each(data, function() {
    var html = $(this.label);
    article_title = html.find(".article-autocomplete-subject").html();
    if (this.id.indexOf("questions") !== -1) {
      auto_suggest_questions += '<li><a target="_blank" href="' + this.id + '" class="discussion">' + article_title + '</a></li>';
    } else {
      auto_suggest_articles += '<li><a target="_blank" href="' + this.id + '" class="article">' + article_title + '</a></li>';
    }
    as_count++;
  });
  if (as_count > 0) {
    $('#autosuggest ul').append(auto_suggest_articles + auto_suggest_questions);
    $("#common").hide();
    $(".autosuggest").removeClass('hide');
  } else {
    $("#autosuggest").addClass('hide');
    $("#common").show();
  }
};
  
apiFail = function(data) {
    
};
</script>

This code snippet requires jQuery. You can use a CDN and quickly insert it into your code by adding this to your code:

<script src="http://code.jquery.com/jquery-1.11.0.min.js"></script>
<script src="http://code.jquery.com/jquery-migrate-1.2.1.min.js"></script>