Array values not able to get on Ajax success with JSON.parse-CodePudding

I have the following jQuery and Ajax codes

$("#grabIdCodeDetails").click(function() {
  var idCodeForDetails = $("#idCode").val();
  if (idCodeForDetails.trim() == "") {
    errorFunction("Please key in an ID Code");
    hidePreviousShownResult();
  } else {
    $.ajax({
      type: "POST",
      url: "fetchIdCodeDetailsFromDatabaseAjax.php",
      data: {
        idCodeForDetails: idCodeForDetails
      },
      success: function(fetchedDetails) {
        var returnedData = JSON.parse(fetchedDetails); 
        alert(returnedData['needle']);
      }
    });
  }
});

Following are the codes in fetchIdCodeDetailsFromDatabaseAjax.php page

$resultArray = [];
array_push($resultArray, $DeviceName, $Start_Date, $Customer, $TotalPinCount, $NeedleType, $DeliveryDate);

$DeviceName = $resultArray[0];
$Start_Date = $resultArray[1];
$Customer = $resultArray[2];
$TotalPinCount = $resultArray[3];
$NeedleType = $resultArray[4];
$DeliveryDate = $resultArray[5];

    echo json_encode(array(
            'needle' => $NeedleType,
            'deviceName' => $DeviceName,
            'pinCount' => $TotalPinCount,
            'startDate' => $Start_Date,
            'endDate' => $DeliveryDate,
            'customer' => $Customer
    ));

In the above $DeviceName, $Start_Date, $Customer, $TotalPinCount, $NeedleType, $DeliveryDate have respective values. When I echo, I can see the individual values.

But I am having Uncaught SyntaxError: Unexpected end of JSON input at JSON.parse (<anonymous>) error while executing this. I read that this could be due to it is returning empty strings. But that is not the case. When I tried to inspect type of data returning on Ajax success using alert(jQuery.type(fetchedDetails)), it shows string. Does anyone know what is going wrong here?

CodePudding user response：

I think there is some problem with your code. Simply just write:

    echo json_encode([
        'needle' => $NeedleType,
        'deviceName' => $DeviceName,
        'pinCount' => $TotalPinCount,
        'startDate' => $Start_Date,
        'endDate' => $DeliveryDate,
        'customer' => $Customer
    ]);

You do not need array push etc.

For your front end try to console.log(fetchedDetails)

$("#grabIdCodeDetails").click(function() {
  var idCodeForDetails = $("#idCode").val();
  if (idCodeForDetails.trim() == "") {
    errorFunction("Please key in an ID Code");
    hidePreviousShownResult();
  } else {
    $.ajax({
      type: "POST",
      url: "fetchIdCodeDetailsFromDatabaseAjax.php",
      data: {
        idCodeForDetails: idCodeForDetails
      },
      success: function(fetchedDetails) {
        console.log(fetchedDetails) // here 
      },
      error: function (xhr, ajaxOptions, thrownError) {
        console.log(xhr.status);
        console.log(thrownError);
       }
    });
  }
});

Alert won't show details.

After that check your fetchedDetails and then use

JSON.parse(fetchedDetails)

JSON.parse(fetchedDetails.data)

You may have some status codes etc.

CodePudding user response：

You have to return the JSON encoded array instead of echo. You can use typeOf() in jQuery to check the data type.

return  json_encode(array(
            'needle' => $NeedleType,
            'deviceName' => $DeviceName,
            'pinCount' => $TotalPinCount,
            'startDate' => $Start_Date,
            'endDate' => $DeliveryDate,
            'customer' => $Customer
    ));