错误无法读取未定义的属性“toLowerCase”

Question

我试图获取输入项字母表自动填充列表，但是当我想搜索它显示在控制台内的内容时

<块引用>

无法读取未定义的属性“toLowerCase”

这是我的代码，我想通过它来填充下拉搜索项

// Do the actual search
function run_search(query) {
  var cache_key = query + computeURL();
  var cached_results = cache.get(cache_key);
  if (cached_results) {
    if ($.isFunction($(input).data("settings").onCachedResult)) {
      cached_results = $(input).data("settings").onCachedResult.call(hiddenInput, cached_results);
    }
    populateDropdown(query, cached_results);
  } else {
    // Are we doing an ajax search or local data search?
    if ($(input).data("settings").url) {
      var url = computeURL();
      // Extract existing get params
      var ajax_params = {};
      ajax_params.data = {};
      if (url.indexOf("?") > -1) {
        var parts = url.split("?");
        ajax_params.url = parts[0];

        var param_array = parts[1].split("&");
        $.each(param_array, function(index, value) {
          var kv = value.split("=");
          ajax_params.data[kv[0]] = kv[1];
        });
      } else {
        ajax_params.url = url;
      }

      // Prepare the request
      ajax_params.data[$(input).data("settings").queryParam] = query;
      ajax_params.type = $(input).data("settings").method;
      ajax_params.dataType = $(input).data("settings").contentType;
      if ($(input).data("settings").crossDomain) {
        ajax_params.dataType = "jsonp";
      }

      // exclude current tokens?
      // send exclude list to the server, so it can also exclude existing tokens
      if ($(input).data("settings").excludeCurrent) {
        var currentTokens = $(input).data("tokenInputObject").getTokens();
        var tokenList = $.map(currentTokens, function(el) {
          if (typeof $(input).data("settings").tokenValue == 'function')
            return $(input).data("settings").tokenValue.call(this, el);

          return el[$(input).data("settings").tokenValue];
        });

        ajax_params.data[$(input).data("settings").excludeCurrentParameter] = tokenList.join($(input).data("settings").tokenDelimiter);
      }

      // Attach the success callback
      ajax_params.success = function(results) {
        cache.add(cache_key, $(input).data("settings").jsonContainer ? results[$(input).data("settings").jsonContainer] : results);
        if ($.isFunction($(input).data("settings").onResult)) {
          results = $(input).data("settings").onResult.call(hiddenInput, results);
        }

        // only populate the dropdown if the results are associated with the active search query
        if (input_box.val() === query) {
          populateDropdown(query, $(input).data("settings").jsonContainer ? results[$(input).data("settings").jsonContainer] : results);
        }
      };

      // Provide a beforeSend callback
      if (settings.onSend) {
        settings.onSend(ajax_params);
      }

      // Make the request
      $.ajax(ajax_params);
    } else if ($(input).data("settings").local_data) {
      // Do the search through local data
      var results = $.grep($(input).data("settings").local_data, function(row) {
        return row[$(input).data("settings").propertyToSearch].toLowerCase().indexOf(query.toLowerCase());
      });

      cache.add(cache_key, results);
      if ($.isFunction($(input).data("settings").onResult)) {
        results = $(input).data("settings").onResult.call(hiddenInput, results);
      }
      populateDropdown(query, results);
    }
  }
}