javascript - google 图表未在 php 中使用 ajax 调用显示

Question

这是我的 array.php，其中 json 数据来自数据库，我从下面的脚本中得到了完美的结果

$table = [];
  $table['cols'] = array(
      array('id' => '', 'label' => 'Topping', 'type' => 'string'),
      array('id' => '', 'label' => 'Slices', 'type' => 'number')
      );    

$tableName = array('1' => "tb", '2' => 'tb1');
foreach ($tableName as $key => $value) {

    $row = [];
    $qry = "SELECT topping, slices FROM $value";
    $result = mysqli_query($con,$qry);
     foreach ($result as $row) {
        $temp = [];
          $temp[] = array('v' => (string) $row['topping']);
      $temp[] = array('v' => (int) $row['slices']); 
      $rows[] = array('c' => $temp);        
     }
     $result->free();
             $table['rows'] = $rows;
}
mysqli_close($con);
$jsonTable = json_encode($table, true);
echo $jsonTable;

<小时/>

**Array.php 数据输出示例:**

{"cols":[{"id":"","label":"Topping","type":"string"},{"id":"","label":"Slices","type":"number"}],"rows":[{"c":[{"v":"MAX"},{"v":150}]},{"c":[{"v":"MAX1"},{"v":59}]},{"c":[{"v":"MAX2"},{"v":15}]},{"c":[{"v":"MAX3"},{"v":153}]},{"c":[{"v":"MAX4"},{"v":8}]},{"c":[{"v":"MAX5"},{"v":25}]},{"c":[{"v":"MAX6"},{"v":65}]}]

}

<小时/>

这是我的 Ajax 函数，我在其中从 array.php 计算数据

var jsonData = $.ajax({
url: "array.php",
dataType:"json",
}).responseText;

var data = new google.visualization.DataTable(JSON.parse(jsonData)); 变量选项= { 标题:“我的日常事件” }; var Chart = new google.visualization.PieChart(document.getElementById('piechart')); 图表.draw(数据，选项)；

**但我仍然遇到错误，请帮助**

Answer 1

好的，我已将您的 json 输出复制到 php 文件 (jsondata.php)，如下所示:

$out = '{"cols":[{"id":"","label":"Topping","type":"string"},{"id":"","label":"Slices","type":"number"}],"rows":[{"c":[{"v":"MAX"},{"v":150}]},{"c":[{"v":"MAX1"},{"v":59}]},{"c":[{"v":"MAX2"},{"v":15}]},{"c":[{"v":"MAX3"},{"v":153}]},{"c":[{"v":"MAX4"},{"v":8}]},{"c":[{"v":"MAX5"},{"v":25}]},{"c":[{"v":"MAX6"},{"v":65}]}]}';
echo $out; 

使用它，我修改了你的 javascript

  var jsonData = $.ajax({
      url: "jsondata.php",
      dataType: "json",
      async: false
      }).responseText;

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

  // Instantiate and draw our chart, passing in some options.
  var chart = new google.visualization.PieChart(document.getElementById('piechart'));
  var options = { title: 'My Daily Activities' };
  chart.draw(data, options);

注意两件事:

• Ajax 调用中的 async:false。这实际上违背了 Ajax 的本质，但这就是 google 显示示例的方式，也是解决问题的最简单方法。

• var data = new google.visualization.DataTable(jsonData);

这对我有用，希望它能解决您的问题。