javascript - 未捕获的语法错误 : Unexpected token < in CodeIgniter

Question

我目前正在处理 CodeIgniter 图表，但遇到如下错误:

Uncaught SyntaxError: Unexpected token <

图表未加载显示空白。

var data_course_stats = google.visualization.arrayToDataTable([
          ['Course', 'Time spent',{ role: 'style' }],
           <?php 
           $i=0;
           foreach ($timespent_stats as $course) { $course = (object)$course;
           $color_val = 'green';
            if(count($i<count($timespent_stats)))
              $color_val = $colors[$i++];
            ?>
         ['<?php echo $course->title;?>', <?php echo $course->spent_seconds/60;?>,'<?php echo $color_val; ?>'],
         <?php } ?>
        ]);

        var options_course_stats = {
          title: 'Course Wise Spent Time in Minutes',
          curveType: 'function',
           height: 400,
             bar: {groupWidth: "50%"},
          legend: { position: "none" },
};

Answer 1

对于较长的 block ，要保持 PHP 开放 - 您会遇到麻烦，因为您在混合和匹配开放和封闭。改变这个:

       <?php 
       $i=0;
       foreach ($timespent_stats as $course) { $course = (object)$course;
       $color_val = 'green';
        if(count($i<count($timespent_stats)))
          $color_val = $colors[$i++];
        ?>
     ['<?php echo $course->title;?>', <?php echo $course->spent_seconds/60;?>,'<?php echo $color_val; ?>'],
     <?php } ?>

为此:

<?php 
       $i=0;
       foreach ($timespent_stats as $course) { 
         $course = (object)$course;
         $color_val = 'green';
         if(count($i<count($timespent_stats))) {
            $color_val = $colors[$i++];

            echo "['" . $course->title . "','" .  
                        $course->spent_seconds/60 . "','" . 
                        $color_val . "']"; 
         }
       }
       ?>