CI：未定义变量

Question

I know similiar questions have been asked, but I've still been unable to resolve my issue. 我知道有人问过类似的问题，但仍然无法解决我的问题。 When my view loads, I get the error below, and I know there is a value in $id. 加载视图时，出现以下错误，并且我知道$ id中有一个值。

Message: Undefined variable: id Filename: admin/upload_form.php Line Number: 17 消息：未定义的变量：id文件名：admin / upload_form.php行号：17

Controller: 控制器：

public function getEventNameById( $id ) {
            $q = $this->event_model->getEventNameById( $id );            
            echo "Event Name: ".$q."</p>";
            $data['id'] = $id;            
            $this->load->view('admin/upload_form',array('error' => ' ' ), $data);
}

View: 视图：

<body>
<div>
<?php echo $error;?>
<p>Event Image:</p>
<?php echo form_open_multipart('admin_upload/do_upload');?>

<input type="file" name="userfile" size="20" />
<br /><br />
<input type="hidden" id="iEventID" name="iEventID" value="<?php echo $id;?>" />
<input type="submit" value="upload event image" /> <input type="button" value="close" 
onclick="window.close()">

</form>
</div>
</body>

What I need to be able to do, is query information based on an ID, then pass that ID to my view, which will then pass the ID back to a different controller function for use in updating a record in my database. 我需要做的是基于ID的查询信息，然后将该ID传递给我的视图，然后将其传递回另一个控制器功能，以用于更新数据库中的记录。 In other words I need to persist the ID throughout. 换句话说，我需要始终保留该ID。

Any and all assistance is greatly appreciated. 任何帮助都将不胜感激。

Answer 1

You're passing the view data incorrectly: 您错误地传递了视图数据：

Your code passes 3 parameters: 您的代码传递了3个参数：

$this->load->view('admin/upload_form', array('error' => ' ' ), $data);
//                |        1         |            2          |   3   |

You should pass all data to the second parameter: 您应该将所有数据传递给第二个参数：

$this->load->view('admin/upload_form', array('error' => ' ' ) + $data);
//                |        1         |                  2             |

The third param is supposed to be a boolean, whether or not to print the data directly (default false ) or store it in a variable ( true ). 第三个参数应该是布尔值，是直接打印数据（默认为false ）还是将其存储在变量中（ true ）。

I just used the + operator to combine the arrays, but it probably would be cleaner to use this: 我只是用+运算符组合了数组，但是使用它可能会更干净：

$data['error'] = ''; // Not sure why this is needed, but I assume it is
$data['id'] = $id;   
$this->load->view('admin/upload_form', $data);

What happened was your $data array wasn't getting passed to the view at all, hence the undefined variable. 发生的是您的$data数组根本没有传递给视图，因此未定义变量。

Reference: http://codeigniter.com/user_guide/libraries/loader.html 参考： http : //codeigniter.com/user_guide/libraries/loader.html

CI：未定义变量

问题描述

1 个解决方案

解决方案1
1 已采纳 2011-07-25 21:49:01

CI：未定义变量

问题描述

1 个解决方案

解决方案1 1 已采纳 2011-07-25 21:49:01

解决方案1
1 已采纳 2011-07-25 21:49:01