search by @ symbol in autocomplete

<div id="post_content" contenteditable="true" class="post_content_textarea">
     
  </div>

<script>
var availableTags = <%= raw @users %>;

  
function split(val) {

      return val.split(/@\s*/);
}


function extractLast(term) {
    return split(term).pop();
}



  $(".post_content_textarea")
  // don't navigate away from the field on tab when selecting an item
  .bind("keydown", function(event) {
      if (event.keyCode === $.ui.keyCode.TAB && $(this).data("autocomplete").menu.active) {
          event.preventDefault();
      }
  }).autocomplete({
      minLength: 0,
      source: function(request, response) {

          var term = request.term,
              results = [];
          if (term.indexOf("@") >= 0) {
              
              term = extractLast(request.term);
              if (term.length > 0) {
                results = $.ui.autocomplete.filter(
                availableTags, term.trim());

              } else {
                  results = ['Start typing...'];
              }
          }
          
          response(results);
      },
      focus: function() {
          // prevent value inserted on focus
          return false;
      },
      select: function(event, ui) {
          var terms = split($(this).html());
          // remove the current input
           
          terms.pop();
          // add the selected item

          terms.push("<span class='tagged_uid' style='color:red' id="+ui.item.value+">"+ui.item.label+"</span>");
          // add placeholder to get the comma-and-space at the end
          terms.push("&nbsp;");
          $(this).html(terms.join(""));
          return false;
       
      }
  });



</script>

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