FullCalendar无法加载CodeIgniter数据问题求助

Let's walk through the most likely reasons your FullCalendar isn't displaying events from your CodeIgniter API, along with practical fixes for each scenario:

1. Check for Invalid or Impure JSON Output #

FullCalendar depends entirely on valid, unadulterated JSON to render events. Echoing JSON directly from a view can easily introduce hidden problems:

• Extra whitespace, newlines, or accidental HTML snippets (from unclosed PHP tags or leftover template code) will break JSON parsing.
• PHP errors (like database connection failures or undefined variables) might inject error messages into the response, making it invalid.

Fix Steps:

• Directly visit your endpoint URL (https://panel.strater.com.au/index.php?staff/load/) in a browser. Copy the output and test it with a JSON validator (you can use your browser's console: run JSON.parse('your-output-here') to check for parsing errors).
• Move the JSON generation logic to your Staff controller instead of a view for better control. Example controller code:

  public function load() {
      // Fetch institution ID from session
      $institution_id = $this->session->userdata('institution_id');
      
      $events = [];
      if ($institution_id) {
          // Get projects from database
          $projects = $this->db->get_where('project', ['institution_id' => $institution_id])->result_array();
          
          // Format events for FullCalendar
          foreach ($projects as $row) {
              $events[] = [
                  'id' => $row["project_code"],
                  'title' => $row["description"],
                  // Use ISO 8601 format (FullCalendar's most reliable date format)
                  'start' => date('c', $row["timestamp_start"]),
                  'end' => date('c', $row["timestamp_end"])
              ];
          }
      }
      
      // Set proper JSON header and output clean JSON
      $this->output
          ->set_content_type('application/json')
          ->set_output(json_encode($events));
  }
  

• If you must use a view, ensure there are no spaces/newlines before <?php and omit the closing ?> entirely to avoid trailing whitespace.

2. Verify Date Format Compatibility #

Your current date format (d-M-Y H:i:s) might not be parsed correctly by FullCalendar. While it can handle some human-readable formats, ISO 8601 (e.g., 2024-05-20T14:30:00) is the most universally supported.

Fix:
Replace your date() calls with date('c', $timestamp) as shown in the controller example above—this generates a format FullCalendar understands natively.

3. Check for Session or Database Query Issues #

If your institution_id session variable is missing or invalid, your database query will return no results, resulting in an empty JSON array (and no events).

Fix Steps:

• Temporarily add debug output to your endpoint to confirm the session value:

  // Add this at the top of your controller method
  var_dump($this->session->userdata('institution_id'));
  exit;
  

• Run the query directly in your database (replace {valid-institution-id} with a known valid value) to ensure it returns data:

  SELECT * FROM project WHERE institution_id = {valid-institution-id};
  

4. Inspect Network Requests with Browser Dev Tools #

Use your browser's Developer Tools (Network tab) to audit the request to your endpoint:

• Status Code: Ensure it returns 200 OK (not 404, 500, or 403). A 500 error means there's a server-side PHP issue—check CodeIgniter's error logs for details.
• Response Content: Confirm the response is pure JSON with no error messages or extra text.
• CORS Issues: If your calendar page is hosted on a different domain than the API, you'll see a CORS error. Fix this by adding CORS headers to your controller:

  $this->output
      ->set_header('Access-Control-Allow-Origin: https://your-calendar-domain.com') // Restrict to your domain for security
      ->set_content_type('application/json')
      ->set_output(json_encode($events));
  

5. Validate FullCalendar Initialization #

Double-check your FullCalendar code for typos or misconfigurations:

• Ensure the events URL has no typos in controller/method names.
• Confirm the #calendar element exists on the page before initialization (your $(document).ready() wrapper handles this, but it's worth verifying with console.log($('#calendar').length)).

内容的提问来源于stack exchange，提问作者Taylan Selvi