JSON中位于位置0的意外令牌

Question

我正在使用ajax从输入字段中获取文本，并通过php检查它们而不是将它们存储在数据库中...但是在行上的某个地方，出了点问题，并且我Unexpected token s in JSON at position 0收到了Unexpected token s in JSON at position 0这个错误。 。

 $(".df-sub").on('click',function(e){ e.preventDefault(); resetErrors(); $('.inputTxtError').children('form input').css({'border-color' : '','box-shadow' : ''}); var data = {}; $.each($('form input, form select'), function(i, v) { if (v.type !== 'submit') { data[v.name] = v.value; } }); $.ajax({ dataType: "JSON", type: "POST", data: data, cache: false, url: "/ajax/diet/diet-page-error-display.php", success: function(result){ if(result === "true"){ console.log('raboti do tuk'); $(".df-sub").submit(); window.location = "http://www.homepage.co.uk/thankyou"; return false; }else { console.log('ne raboti'); $.each(result, function(i, v) { //console.log(i + " => " + v); // view in console for error messages var msg = '<label class="diet-error" for="'+i+'" style="background:red;">'+v+'</label>'; $('input[name="' + i + '"], select[name="' + i + '"]').css({'border-color' : '#cc0000','box-shadow' : '0 0 10px #cc0000'}).closest('div').addClass('inputTxtError').after(msg); }); var keys = Object.keys(result); $('input[name="'+keys[0]+'"]').focus(); } return false; }, error: function(jqXHR, textStatus, errorThrown) { //console.log(JSON.stringify(result)); alert(jqXHR.status); alert(textStatus); alert(errorThrown); } }); function resetErrors() { $('form input, form select').removeClass('inputTxtError'); $('label.diet-error').remove(); } }); 

 <?php header('Content-type:application/json;charset=utf-8'); if(isset($_POST)){ if (filter_var($_POST['age'], FILTER_VALIDATE_INT) === false){ $_SESSION['errors']['age'] = 'Моля използвайте само цифри в полето за Вашата възраст!'; } if (filter_var($_POST['height'], FILTER_VALIDATE_INT) === false){ $_SESSION['errors']['height'] = 'Моля използвайте само цифри в полето за Вашата височина!'; } if (filter_var($_POST['weight'], FILTER_VALIDATE_INT) === false){ $_SESSION['errors']['weight'] = 'Моля използвайте само цифри в полето за Вашато тегло!'; } if (filter_var($_POST['budget'], FILTER_VALIDATE_INT) === false){ $_SESSION['errors']['budget'] = 'Моля използвайте само цифри в полето за Вашият бюджет!'; } if (filter_var($_POST['email'],FILTER_VALIDATE_EMAIL) === false){ $_SESSION['errors']['email'] = 'Моля въведете валиден имейл адрес!'; } if(empty($_POST['email'])){ $_SESSION['errors']['email'] = 'Моля въведете имейл за връзка'; } if(empty($_POST['age'])){ $_SESSION['errors']['age'] = 'Моля въведете Вашата възраст!'; } if(empty($_POST['height'])){ $_SESSION['errors']['height'] = 'Моля въведете Вашата височина!'; } if(empty($_POST['weight'])){ $_SESSION['errors']['weight'] = 'Моля въведете Вашето тегло!'; } if(!isset($_POST['sex'])){ $_SESSION['errors']['sex'] = 'Моля изберете пол !'; } if(!isset($_POST['activity'])){ $_SESSION['errors']['activity'] = 'Моля изберете активност! !'; } if(!isset($_POST['goal'])){ $_SESSION['errors']['goal'] = 'Моля изберете цел !'; } }// if(count($_SESSION['errors']) > 0){ if(!empty($_SERVER['HTTP_X_REQUESTED_WITH']) && strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) == 'xmlhttprequest') { echo json_encode($_SESSION['errors']); unset($_SESSION['errors']); exit(); } echo "<ul>"; foreach($_SESSION['errors'] as $key => $value){ echo "<li>" . $value . "</li>"; } echo "</ul>"; unset($_SESSION['errors']); exit(); }else{ $age = clean_xss_int($_POST['age']); $height = clean_xss_int($_POST['height']); $weight = clean_xss_int($_POST['weight']); $email = clean_xss($_POST['email']); $sex = clean_xss($_POST['sex']); $activity = clean_xss($_POST['activity']); $goal = clean_xss($_POST['goal']); $diseases = clean_xss($_POST['diseases']); $liked_foods = clean_xss($_POST['liked_foods']); $hated_foods = clean_xss($_POST['hated_foods']); $budget = clean_xss_int($_POST['budget']); $intership = clean_xss($_POST['training']); $description = clean_xss($_POST['eat_usually']); $data = array( 'age' => $age, 'height' => $height, 'weight' => $weight, 'email' => $email, 'sex' => $sex, 'activity' => $activity, 'goal' => $goal, 'diseases' => $diseases, 'liked_foods' => $liked_foods, 'hated_foods' => $hated_foods, 'budget' => $budget, 'intership' => $intership, 'description' =>$description ); //Here is the query usually echo json_encode($data); ?> 

无论我做什么，总是Unexpected token s in JSON at position 0返回Unexpected token s in JSON at position 0 。现在，我尝试删除DataType: "JSON"使用了Content-Type标头，请使用json_encode（）（JSON编码的结果）

链接到网络响应选项卡

在json之前也尝试过utf8_encode（），但是它需要一个字符串而不是数组。 谢谢！

Answer 1

好，所以我整天都在处理此错误，这是对我有用的解决方案。

首先，我检查了JSON在www.jsonlint.com中是否有效并且有效。

其次，我的clean_xss_int函数是错误的，如果输入值是数组，我将对其进行内插，因此最终结果是数字字段的字符串和文本字段的数组。

第三（因为我是ajax的新手），我检查了整个php端，并意识到即使存在空字段，aka也必须返回错误或返回数据数组ajax才能成功完成操作。此外，不需要传递$ data数组再次转换为json，因为我只需要用于插入查询。 所以我写了我在ajax中作为成功返回的array（array（'0'=>'true'）; 我在ajax中将其设置为字符串，并检查成功是否等于字符串'true'。代码如下所示：

  $.ajax({ type: "POST", data: data, dataType: "JSON", url: "/ajax/diet/diet-page-error-display.php", success: function(result){ JSON.stringify(result);// <---- new ;d if(result == "true"){ <--- comparing with 2 x = instead of 3 $(".df-sub").submit(); window.location = "http://www.musclevale.com/diet"; return false; }else { $.each(result, function(i, v) { var msg = '<label class="diet-error" for="'+i+'" style="background:red;">'+v+'</label>'; $('input[name="' + i + '"], select[name="' + i + '"]').css({'border-color' : '#cc0000','box-shadow' : '0 0 10px #cc0000'}).closest('div').addClass('inputTxtError').after(msg); }); var keys = Object.keys(result); $('input[name="'+keys[0]+'"]').focus(); } return false; }, error: function(jqXHR, textStatus, errorThrown) { alert(jqXHR.status); alert(textStatus); alert(errorThrown); } }); 

 <?php $age = clean_xss_int($_POST['age']); $height = clean_xss_int($_POST['height']); $weight = clean_xss_int($_POST['weight']); $email = clean_xss($_POST['email']); $sex = clean_xss($_POST['sex']); $activity = clean_xss($_POST['activity']); $goal = clean_xss($_POST['goal']); $diseases = clean_xss($_POST['diseases']); $liked_foods = clean_xss($_POST['liked_foods']); $hated_foods = clean_xss($_POST['hated_foods']); $budget = clean_xss_int($_POST['budget']); $intership = clean_xss($_POST['training']); $description = clean_xss($_POST['eat_usually']); $data = array( 'age' => $age, 'height' => $height, 'weight' => $weight, 'email' => $email, 'sex' => $sex, 'activity' => $activity, 'goal' => $goal, 'diseases' => $diseases, 'liked_foods' => $liked_foods, 'hated_foods' => $hated_foods, 'budget' => $budget, 'intership' => $intership, 'description' =>$description ); $fields = implode(',',array_keys($data)); $values = '\\'' . implode('\\', \\'', $data) . '\\''; $query = mysqli_query($connect,"INSERT INTO buyed_diets ($fields) VALUES ($values)"); echo json_encode(array('0' => 'true'));// <----new ;d ?>