Jquery错误需要修正：无效字符串错误JSON

尝试使用下拉菜单和api生成饼图，但显示无效字符串的表存在json错误。Jquery错误需要修正：无效字符串错误JSON

馅饼文件

<?php 

$dbHost = 'localhost'; 
$dbUsername = 'root'; 
$dbPassword = ''; 
$dbName = 'techyari_demos'; 

// Create connection and select db 
$db = new mysqli($dbHost, $dbUsername, $dbPassword, $dbName); 
?> 
<html> 
<head> 
    <!--Load the AJAX API--> 
    <script type="text/javascript" src="http://www.google.com/jsapi"></script> 
    <script type="text/javascript" src="jquery-1.9.1.min.js"></script> 
    <script type="text/javascript"> 

    // Load the Visualization API and the piechart,table package. 
    google.load('visualization', '1', {'packages':['corechart','table']}); 


    function drawItems(num) { 
    var jsonPieChartData = $.ajax({ 
     url: "getpiechartdata.php", 
     data: "q="+num, 
     dataType:"json", 
     async: false 
    }).responseText; 

    var jsonTableData = $.ajax({ 
     url: "gettabledata.php", 
     data: "q="+num, 
     dataType:"json", 
     async: false 
    }).responseText; 

    // Create our data table out of JSON data loaded from server. 
    var piechartdata = new google.visualization.DataTable(jsonPieChartData); 
    var tabledata = new google.visualization.DataTable(jsonTableData); 

    // Instantiate and draw our pie chart, passing in some options. 
    var chart = new google.visualization.PieChart(document.getElementById('chart_div')); 
    chart.draw(piechartdata, { 
     width: 700, 
     height: 500, 
     chartArea: { left:"5%",top:"5%",width:"90%",height:"90%" } 
    }); 

    // Instantiate and draw our table, passing in some options. 
    var table = new google.visualization.Table(document.getElementById('table_div')); 
    table.draw(tabledata, {showRowNumber: true, alternatingRowStyle: true}); 
    } 

    </script> 
</head> 
<body> 
    <form> 
    <select name="pt" onchange="drawItems(this.value)"> 
    <option value="">Select a server:</option> 
    <?php 
    $dbHost = 'localhost'; 
$dbUsername = 'root'; 
$dbPassword = ''; 
$dbName = 'techyari_demos'; 
    // Make a MySQL Connection 
    $con = mysqli_connect($dbHost, $dbUsername, $dbPassword, $dbName) or die(mysql_error()); 
    mysqli_select_db($con,"techyari_demos") or die(mysqli_error()); 
    // Create a Query 
    $sql_query = "SELECT id, servername FROM server ORDER BY servername ASC"; 
    // Execute query 
    $result = mysqli_query($con,$sql_query) or die(mysqli_error()); 
    while ($row = mysqli_fetch_array($result)){ 
    echo '<option value='. $row['id'] . '>'. $row['servername'] . '</option>'; 
    } 
    mysqli_close($con); 
    ?> 
    </select> 
    </form> 
    <div id="chart_div"></div> 
    <div id="table_div"></div> 
</body> 
</html>

getpiechartdata

<?php 
$q=$_GET["q"]; 
$dbHost = 'localhost'; 
$dbUsername = 'root'; 
$dbPassword = ''; 
$dbName = 'techyari_demos'; 

$db = new mysqli($dbHost, $dbUsername, $dbPassword, $dbName); 

$sql_query="SELECT * from entry"; 
// $sql_query = "SELECT nickname, name, j2.label, j2.pointsum FROM user JOIN (SELECT j1.user_id, j1.label, name, hover, j1.pointsum FROM activityfield JOIN (SELECT user_id, activity_id, label, field_id , SUM(points.points) AS PointSum FROM points JOIN activity ON points.activity_id = activity.id WHERE points.user_id=" . $q . " GROUP BY points.user_id, points.activity_id, activity.label, activity.field_id ORDER BY points.activity_id ASC) AS j1 ON activityfield.id = j1.field_id) AS j2 ON j2.user_id = user.id WHERE pointsum > 0 ORDER BY j2.pointsum DESC;"; 

    $con = mysqli_connect($dbHost, $dbUsername, $dbPassword, $dbName)or die(mysql_error());; 
    if (!$con){ die('Could not connect: ' .mysqli_error());} 
    mysqli_select_db($con,"techyari_demos"); 
    $result = mysqli_query($con,$sql_query); 
    echo "{ \"cols\": [ {\"id\":\"\",\"label\":\"Name-Label\",\"pattern\":\"\",\"type\":\"string\"}, {\"id\":\"\",\"label\":\"PointSum\",\"pattern\":\"\",\"type\":\"number\"} ], \"rows\": [ "; 
    $total_rows = mysqli_num_rows($result)or die(mysqli_error());; 
    $row_num = 0; 
    while($row = mysqli_fetch_array($result)){ 
    $row_num++; 
    if ($row_num == $total_rows){ 
     echo "{\"c\":[{\"v\":\"" . $row['date'] . "-" . $row['sname'] . "\",\"f\":null},{\"v\":" . $row['status'] . ",\"f\":null}]}"; 
    } else { 
     echo "{\"c\":[{\"v\":\"" . $row['date'] . "-" . $row['sname'] . "\",\"f\":null},{\"v\":" . $row['status'] . ",\"f\":null}]}, "; 
    } 
    } 
    echo " ] }"; 
    mysqli_close($con); 
?>

gettabledata

<?php 
    $q=$_GET["q"]; 
$dbHost = 'localhost'; 
$dbUsername = 'root'; 
$dbPassword = ''; 
$dbName = 'techyari_demos'; 


    $sql_query="SELECT date,sname,dbs,status,updatedby from entry"; 

    $con = mysqli_connect($dbHost, $dbUsername, $dbPassword, $dbName); 
    if (!$con){ die('Could not connect: ' . mysql_error()); } 
    mysqli_select_db($con,"techyari_demos"); 
    $result = mysqli_query($con,$sql_query); 

    echo "{\"c\":[{\"v\":\"" .'date'. "\",\"f\":null},{\"v\":\"" .'sname' . "\",\"f\":null},{\"v\":\"" .'dbs' . "\",\"f\":null},{\"v\":\"" .'status'. "\",\"f\":null},{\"v\":\"".'updatedby'."\",\"f\":null}]}, "; 

    $total_rows = mysqli_num_rows($result); 
    while($row = mysqli_fetch_array($result)){ 
    echo "{\"c\":[{\"v\":\"" . $row['date'] . "\",\"f\":null},{\"v\":\"" . $row['sname'] . "\",\"f\":null},{\"v\":\"" . $row['dbs'] . "\",\"f\":null},{\"v\":\"" .$row['status']."\",\"f\":null},{\"v\":\"" . $row['updatedby']. "\",\"f\":null}]}, "; 
    } 

/* $result = mysqli_query($sql_query2); 
    while($row = mysqli_fetch_array($result)){ 
    echo "{\"c\":[{\"v\":\"" . $row['servername'] . "\",\"f\":null},{\"v\":\"" . "\",\"f\":null},{\"v\":\"" . "\",\"f\":null},{\"v\":\" Total \",\"f\":null},{\"v\":\"" . $row['dbs'] . "\",\"f\":null}]}"; 
    } 
    echo " ] }";*/ 
    mysqli_close($con); 
?>

来源

2017-07-19 Sanjeevani Avasthi

那一行并在浏览器说的错误是什么？ –

你为什么要手工编码所有的JSON？创建一个数组/对象，然后使用任何PHP的JSON编码功能。 – nnnnnn

夫妇的事情，1）创建一个函数或类，可以检索您的连接，做你的连接在随机和重复点不是想法，2）一般创建函数检索数据库数组，使您的脚本manageable 3）使用'json_encode ）'创建json，而不是你的手动回响 – Rasclatt

继我的意见（和其他人的意见），创建一些类的再利用性和可读性，创建一个用于存储重复使用的配置，然后最后在阵列上使用json_encode()为你的ajax创建json字符串。我不知道他们是否正确形成，但他们将是有效的JSON字符串：

/config.php

<?php 
# Used for universal directory separator compatibility 
define('DS',DIRECTORY_SEPARATOR); 
# Store absolute paths for easy referencing 
define('ROOT_DIR',__DIR__); 
define('VENDOR_DIR',ROOT_DIR.DS.'core'.DS.'vendors'); 
# Store database connection credentials this one spot only 
define('DB_HOST','localhost'); 
define('DB_NAME','techyari_demos'); 
define('DB_USER','root'); 
define('DB_PASS',''); 
# Start user session 
session_start(); 
# Create class autoloader so you don't have to worry about including manually 
spl_autoload_register(function($class) { 
    $path = str_replace(DS.DS,DS,VENDOR_DIR.DS.str_replace('\\',DS,$class).'.php'); 
    if(is_file($path)) 
     include_once($path); 
});

/core/vendors/Database.php

<?php 
class Database 
    { 
     private static $con; 
     private $query; 
     # Assign database 
     public static function init() 
      { 
       $db = new Database(); 
       return $db->getConnection(); 
      } 
     # Creates database connection 
     public function getConnection() 
      { 
       if(self::$con instanceof \PDO) 
        return $this; 

       try { 
        self::$con = new \PDO("mysql:host=".DB_HOST.";dbname=".DB_NAME,DB_USER,DB_NAME); 
       } 
       catch(\PDOException $e) { 
       } 

       return $this; 
      } 
     # Used to query database 
     public function query($sql,$bind=false) 
      { 
       if(!empty($bind)) { 
        foreach($bind as $key => $value) { 
         $skey = ":$key"; 
         $setBind[$skey] = $value; 
         $this->query = self::$con->prepare($sql); 
         $this->query->execute($setBind); 
        } 
       } 
       else { 
        $this->query = self::$con->query($sql); 
       } 

       return $this; 
      } 
     # Used to fetch results from database 
     public function getResults($single=false) 
      { 
       $row = array(); 
       while($result = $this->query->fetch(\PDO::FETCH_ASSOC)) { 
        $row[] = $result; 
       } 

       if(empty($row)) 
        return $row; 

       return ($single)? $row[0] : $row; 
      } 
    }

/芯/销售商/ App.php

<?php 
class App 
    { 
     # Easily return post values even if they don't exist without drawing errors 
     public function getPost($key=false) 
      { 
       if(!empty($key)) 
        return (isset($_POST[$key]))? $_POST[$key] : false; 

       return $_POST; 
      } 
     # Easily return get values even if they don't exist without drawing errors 
     public function getGet($key=false) 
      { 
       if(!empty($key)) 
        return (isset($_GET[$key]))? $_GET[$key] : false; 

       return $_GET; 
      } 
     # Easily return session values even if they don't exist without drawing errors 
     public function getSession($key=false) 
      { 
       if(!empty($key)) 
        return (isset($_SESSION[$key]))? $_SESSION[$key] : false; 

       return $_SESSION; 
      } 
     # Used to render pages 
     public function render($file) 
      { 
       ob_start(); 
       # Create instance of database 
       $db = Database::init(); 
       # Include page to render 
       include($file); 
       # Assign view 
       $data = ob_get_contents(); 
       ob_end_clean(); 
       # Return for echo 
       return $data; 
      } 
    }

的index.php

<?php 
if(!isset($this)) { 
    include_once(__DIR__.DIRECTORY_SEPARATOR.'config.php'); 
    echo (new App())->render(__FILE__); 
    exit; 
} 
?> 
<html> 
<head> 
    <!--Load the AJAX API--> 
    <script type="text/javascript" src="http://www.google.com/jsapi"></script> 
    <script type="text/javascript" src="jquery-1.9.1.min.js"></script> 
    <script type="text/javascript"> 

    // Load the Visualization API and the piechart,table package. 
    google.load('visualization', '1', {'packages':['corechart','table']}); 


    function drawItems(num) { 
    var jsonPieChartData = $.ajax({ 
     url: "getpiechartdata.php", 
     data: "q="+num, 
     dataType:"json", 
     async: false 
    }).responseText; 

    var jsonTableData = $.ajax({ 
     url: "gettabledata.php", 
     data: "q="+num, 
     dataType:"json", 
     async: false 
    }).responseText; 

    // Create our data table out of JSON data loaded from server. 
    var piechartdata = new google.visualization.DataTable(jsonPieChartData); 
    var tabledata = new google.visualization.DataTable(jsonTableData); 

    // Instantiate and draw our pie chart, passing in some options. 
    var chart = new google.visualization.PieChart(document.getElementById('chart_div')); 
    chart.draw(piechartdata, { 
     width: 700, 
     height: 500, 
     chartArea: { left:"5%",top:"5%",width:"90%",height:"90%" } 
    }); 

    // Instantiate and draw our table, passing in some options. 
    var table = new google.visualization.Table(document.getElementById('table_div')); 
    table.draw(tabledata, {showRowNumber: true, alternatingRowStyle: true}); 
    } 

</script> 
</head> 
<body> 
    <form> 
     <select name="pt" onchange="drawItems(this.value)"> 
      <option value="">Select a server:</option> 
      <?php 
      $servers = $db->query("SELECT id, servername FROM server ORDER BY servername ASC")->getResults(); 

      foreach($servers as $row) { ?> 
      <option value="<?php echo $row['id'] ?>"><?php echo $row['servername'] ?></option> 
      <?php 
      } 
      ?> 
     </select> 
    </form> 
    <div id="chart_div"></div> 
    <div id="table_div"></div> 
</body> 
</html>

/getpiechartdata.php

<?php 
if(!isset($this)) { 
    include_once(__DIR__.DIRECTORY_SEPARATOR.'config.php'); 
    echo (new App())->render(__FILE__); 
    exit; 
} 

# Internally retrieve the get value 
$q = $this->getGet("q"); 
# Run your general query 
$results = $db->query("SELECT * from entry",array($q))->getResults(true); 
# Set base array/object 
$base = array(
    'cols'=>array(
     array(
      'id'=>'', 
      'label'=>'Name-Label', 
      'pattern' => '', 
      'type'=>'string' 
     ), 
     array(
      'id'=>'', 
      'label'=>'PointSum', 
      'pattern' => '', 
      'type'=>'number' 
     ) 
    ) 
); 
# Create default array 
$base['rows'] = array(); 
# Loop results, building on base array/object 
foreach($results as $row) { 
    $base['rows'][] = array(
     'c'=>array(
      array(
       'v'=>$row['date'].' - '.$row['sname'], 
       'f'=>NULL 
      ), 
      array(
       'v'=>$row['status'], 
       'f'=>NULL 
      ) 
     ) 
    ); 
} 
# Return results 
echo json_encode($base);

来源

2017-07-19 14:38:08 Rasclatt

Jquery错误需要修正：无效字符串错误JSON

回答

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