Question

因此，我正在尝试从数组中删除一些元素。我有2个过滤器需要调用。一种是使用搜索框过滤数据，另一种是根据条件过滤。但我收到此错误：

TypeError：TypeError：无法读取未定义的属性“ filter”

这是组件：

const PassengerCardBasedOnRoute = ({
  searchParam,
  passengerCardId,
  isAddToMyPassengersSuccess,
  unassignedDropOffPassengers,
}) => {

  // This is the filter that work based on a search parameter
  const filteredData = filterByParam =>
    filterByParam.filter(obj =>
      Object.keys(obj).some(key =>
        String(obj[key])
          .toLowerCase()
          .includes(searchParam.toLowerCase()),
      ),
    );

  // Here is where I need to remove from the array the condition met
  const filterByPassengerCardId = passengersData => {
    remove(passengersData, info => {
      return info.id === passengerCardId;
    });
  };

  const componentToRenderBasedOnParams = info => (
    <View key={info.id}>
      {isAddToMyPassengersSuccess && info.id === passengerCardId && (
        <PassengersAdded name={info.name} id={info.id} />
      )}
      <PassengersInfo
        id={info.id}
        name={info.name}
        searchParam={searchParam}
      />
    </View>
  );

  const showFeedbackIfNoLength = data => {
    if (!passengerCardId && size(filteredData(data))) {
      filteredData(data).map(info => componentToRenderBasedOnParams(info));
    } else if (passengerCardId) {

      // HERE IS WHERE THE APP THROWS THE ERROR
      filteredData(filterByPassengerCardId(data)).map(info =>
        componentToRenderBasedOnParams(info),
      );

    } else {
      return <EmptyState>No records found</EmptyState>;
    }

    return data;
  };

  return (
    <>
      <OptionsModal>{<AllPassengersOptionsModal />}</OptionsModal>
      <View>
        {!navigationStore.index && unassignedDropOffPassengers
          ? showFeedbackIfNoLength(unassignedDropOffPassengers)
          : null}
      </View>
    </>
  );
};

编辑

出现错误：

  const filteredData = filterByParam =>
    // Here comes the error
    filterByParam.filter(obj =>
      Object.keys(obj).some(key =>
        String(obj[key])
          .toLowerCase()
          .includes(searchParam.toLowerCase()),
      ),
    );

满足此条件时：

      // HERE IS WHERE THE APP THROWS THE ERROR
      filteredData(filterByPassengerCardId(data)).map(info =>
        componentToRenderBasedOnParams(info),
      );

满足此其他条件后，一切正常：

   if (!passengerCardId && size(filteredData(data))) {
      filteredData(data).map(info => componentToRenderBasedOnParams(info));
    }

要实现自己的目标，我缺少什么？

Answer 1

在表达式filteredData(filterByPassengerCardId(data))中，filteredData似乎期望Array；但是，filterByPassengerCardId(data)返回未定义。

将filterByPassengerCardId的返回值更改为Array，该错误不应再引发。

编辑：看到您的评论是您使用的是Lodash的remove method，实际上它会返回Array。

在这种情况下，只需编辑filterByPassengerCardId即可返回调用remove的结果：

const filterByPassengerCardId = passengersData => {
  return remove(passengersData, info => {
    return info.id === passengerCardId;
  });
};

编辑：为简洁起见，或者更好：

const filterByPassengerCardId = passengersData => (
  remove(passengersData, ({id}) => id === passengerCardId)
);

Answer 2

问题可能来自这里：

$server_ip= $_POST['server']; 
$port = $_POST['port'];
$server_ip = gethostbyname($server_ip);
$status = array();

if (empty($_POST["server"]) || empty($_POST['port']) || !filter_var($server_ip, FILTER_VALIDATE_IP) )
{
    echo "some html code";
}

elseif (!(is_numeric($port)))
{
    echo "some other html code";
}

else
{
    if($pf = @fsockopen($_POST['server'], $port, $err, $err_string, 1)) {
        $status = true;
        fclose($pf);
    } else {
        $status = false;
    }

Output code here..
}

也许它没有按照您期望的方式工作，至少它没有返回任何东西。您可能会期望从此函数返回数组。

数组方法错误：TypeError：无法读取未定义的属性“ filter”

2 个答案: