在codeigniter中验证max_length，min_length

I am getting an error when trying to set custom validation messages in CodeIgniter for the min_length and max_length validation constraints.

尝试在CodeIgniter中为min_length和max_length验证约束设置自定义验证消息时出错。

These are my validation rules:

这些是我的验证规则：

$this->form_validation->set_rules('username', 'Username', 'required|xss_clean|min_length[6]|max_length[10]');
$this->form_validation->set_rules('password', 'Password', 'required|min_length[8]|max_length[20]';

These are my custom validation message:

这些是我的自定义验证消息：

$this->form_validation->set_message('min_length[3]', '%s: the minimum of characters is three');
$this->form_validation->set_message('max_length[20]', '%s:the maximum of characters is 20');

In my example we have two fields, but I have many fields with different minimum and maximum length values. They all have a specific constraint validations. This messages doesn't work. The message appears by default. Thanks for your help.

在我的示例中，我们有两个字段，但是我有许多字段具有不同的最小和最大长度值。它们都有特定的约束验证。此消息不起作用。默认情况下会显示该消息。谢谢你的帮助。

4 个解决方案

#1

It's simple one just add another %s to get the length value..

这很简单，只需添加另一个％s即可获得长度值。

$this->form_validation->set_message('min_length', '%s: the minimum of characters is %s');

You will give the size only if you use %s second time. first time it will give field name you specified..

只有在第二次使用％s时才会给出大小。第一次它会给你指定的字段名称..

#2

$this->form_validation->set_rules('password', 'Password', 'required|min_length[8]|max_length[20]';

is missing a closing bracket -- ):

缺少结束括号 - ）：

$this->form_validation->set_rules('password', 'Password', 'required|min_length[8]|max_length[20]');

Update
Perhaps using a callback function would be better? E.g.:

更新也许使用回调函数会更好？例如。：

$this->form_validation->set_rules('username', 'Username', 'required|xss_clean|callback__check_length[6,10]');


/**
 * Callback function. Checks if the length of the user's input
 * conforms to minimum and maximum character length requirements
 *
 * @param  string
 * @param  int
 * @param  int
 * @return bool
 */
function _check_length($input, $min, $max)
{
    $length = strlen($input);

    if ($length <= $max && $length >= $min)
    {
        return TRUE;
    }
    elseif ($length < $min)
    {
        $this->form_validation->set_message('_check_length', 'Minimum number of characters is ' . $min);
        return FALSE;        
    }
    elseif ($length > $max)
    {
        $this->form_validation->set_message('_check_length', 'Maximum number of characters is ' . $max);
        return FALSE;        
    }
}

#3

When using set_message, you can't specify the lengths (both min and max) the way that you have done. You can either set a general message for min_length and max_length like:

使用set_message时，不能指定已完成的长度（最小值和最大值）。您可以为min_length和max_length设置常规消息，如：

$this->form_validation->set_message('min_length', 'The value you have entered for %s is too short');
$this->form_validation->set_message('max_length', 'The value you have entered for %s is too long');

Otherwise, you will have to utilise CodeIgniter's callback feature and set up a custom validation function which would look something like this (for the minimum length!!).

否则，您将不得不使用CodeIgniter的回调功能并设置一个自定义验证函数，看起来像这样（最小长度!!）。

public function custom_min_length($str, $val) {
    if (preg_match("/[^0-9]/", $val)) {
        return FALSE;
    }
    if (function_exists('mb_strlen')) {
        if(mb_strlen($str) < $val) {
            $this->form_validation->set_message('custom_min_length', '%s: The Minimum Number Of Characters Is ' . $val);
            return FALSE;
        } else {
            return TRUE;
        }
    }
    if(strlen($str) < $val) {
        $this->form_validation->set_message('custom_min_length', '%s: The Minimum Number Of Characters Is ' . $val);
        return FALSE;
    } else {
        return TRUE;
    }
}

You would set your validation rule like this:

您可以像这样设置验证规则：

$this->form_validation->set_rules('username', 'Username', 'callback_custom_min_length[6]|required|xss_clean');

Notice the callback_ prefix on the custom_min_length rule. This replaces, and is used instead of the usual min_length CI function.

注意custom_min_length规则上的callback_前缀。这取代了，而不是通常的min_length CI函数。

Hope that helps...I'll leave you figure out how to do the custom_max_length function :)

希望有帮助...我会告诉你如何做custom_max_length函数:)

#4

If you want to show your own validation message, do something like that:

如果要显示自己的验证消息，请执行以下操作：

$this->form_validation->set_message('min_length','YOUR MESSAGE');

without the branches: [num]

没有分支：[num]

Greetings

问候

#1