[# Display a <select> widget with options to set/append/remove/clear the field.
   Args:
    arg0: element ID of widget to disable if Clear is selected.  The form name and ID
          of the <select> will be "op_" + arg0.
    arg1: "multi" for multi-valued fields so that "Append" and "Remove" are offered.
  ]
<select name="op_[arg0]" id="op_[arg0]" style="width:9em" tabindex="-1">
  [is arg1 "multi"]
    <option value="append" selected="selected">Append +=</option>
    <option value="remove">Remove -=</option>
    [# TODO(jrobbins): <option value="setexact">Set exactly :=</option>]
  [else]
    <option value="set" selected="selected">Set =</option>
    <option value="clear">Clear</option>
  [end]
</select>

[is arg1 "multi"][else]
<script type="text/javascript" nonce="[nonce]">

runOnLoad(function() {
  if ($("op_[arg0]")) {
    $("op_[arg0]").addEventListener("change", function(event) {
      TKR_ignoreWidgetIfOpIsClear(event.target, '[arg0]');
    });
  }
});
</script>
[end]