我尝试使用网站提供的教程来学习CodeIgniter框架,而我对php还是很陌生,我可能会问一个愚蠢的问题。 我试图将复选框状态值从“视图”传递给控制器(是否选中了复选框的状态),它在错误消息之后显示。
遇到PHP错误
严重性:警告
消息:为foreach()提供了无效的参数
文件名:controllers / Todos.php
行号:29
当我在控制器中跟踪时,这是由于foreach循环初始化所致。然后我回声
echo $completed_todos;
echo $completed_todos[0];
echo $completed_todos[1]; — No value;
我认为是什么,它不会将所有复选框值都传递给控制器。
在View中,我使用了以下代码: (index.php)
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Simple CodeIgniter App - Todos</title>
<link rel="stylesheet"
href="//maxcdn.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap.min.css">
</head>
<body>
<div class="container">
<?php echo form_open('todos/update_completed'); ?>
<h1>Todos</h1>
<div class="list-group">
<?php foreach ($todos as $todo) { ?>
<div class="list-group-item clearfix">
<?php
echo form_checkbox('completed', $todo->id, $todo->completed);
?>
<?php echo $todo->task; ?>
</div>
在我使用以下代码的控制器中
Todos控制器代码
<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
class Todos extends CI_Controller {
public function __construct() {
parent::__construct();
// Load the todo model to make it available
// to *all* of the controller's actions
$this->load->model('Todo_model');
$this->load->helper('form');
}
public function update_completed() {
$completed_todos = $this->input->post('completed');
echo $completed_todos;
foreach ($completed_todos as $todo_id) {
echo 'The todo with id = ' . $todo_id
. ' is marked as completed.<br>';
}
}
答案 0 :(得分:5)
在这里您要获取多个复选框的值,因此需要放入数组中。但是您尝试了简单的字符串,并在foreach循环中使用了它,这就是为什么它会导致错误。
请检查以下代码。
index.php(查看文件)
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Simple CodeIgniter App - Todos</title>
<link rel="stylesheet"
href="//maxcdn.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap.min.css">
</head>
<body>
<div class="container">
<h1>Todos</h1>
<?php echo form_open('todos/update_completed'); ?>
<div class="list-group">
<?php foreach ($todos as $todo) { ?>
<div class="list-group-item clearfix">
<?php echo form_checkbox('completed[]', $todo->id, $todo->completed); ?>
<?php echo $todo->task; ?>
</div>
<?php } ?>
</div>
<button type="submit">Submit</button>
<?php echo form_close();
</div>
</body>
</html>
Todos(控制器文件)
public function update_completed() {
$completed_todos = $this->input->post('completed');
// No need to echo $completed_todos. If you want then please do below line.
// var_dump($completed_todos);
foreach ($completed_todos as $todo_id) {
echo 'The todo with id = ' . $todo_id. ' is marked as completed.<br>';
}
}