在Codeigniter中选择框验证 [英] select box validation in Codeigniter

问题描述

我是Codeigniter的新人，我在选择框验证有一些麻烦。我想在开始时默认选择值。

i am new to Codeigniter and I have some trouble in select box validation. I want default select value at beginning.

<select name="schooGroups[]">
<option value="0">Select User Group</option>
<option value="1">Admin</option>
</select>

如何在表单中显示错误消息。

how can i make it required field in form and display error message on select of zero "0" value.

推荐答案

这将使标记为selected的条目默认为...。您想要多重选择下拉菜单，对吧？

This will have the entry marked as "selected" as...selected by default. You want a multi-select dropdown, right?

<select name="schoolGroups[]" multiple="multiple">
<option value="0" selected="selected">Select User Group</option>
<option value="1">Admin</option>
</select>

对于验证，您可能需要构建自己的验证规则：

As for validation, you might want to build your own validation rule:

您的控制器的方法：

//...
$this->form_validation->set_rules('schoolGroups','School groups','required|callback_check_default');
$this->form_validation->set_message('check_default', 'You need to select something other than the default');

//...

添加此其他方法：

function check_default($array)
{
  foreach($array as $element)
  {
    if($element == '0')
    { 
      return FALSE;
    }
  }
 return TRUE;
}

如果你只想要一个选择更容易：

If you just want a single select (no ability to multiselect then) it's even easier:

html：

<select name="schoolGroups">
<option value="0" selected="selected">Select User Group</option>
<option value="1">Admin</option>
</select>

验证方法：

 $this->form_validation->set_rules('schoolGroups','School groups','required|callback_check_default');
  $this->form_validation->set_message('check_default', 'You need to select something other than the default');

回呼：

function check_default($post_string)
{
  return $post_string == '0' ? FALSE : TRUE;
}

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