我是Codeigniter的新手,我在选择框验证方面遇到了一些麻烦。我想要开始时的默认选择值。
<select name="schooGroups[]">
<option value="0">Select User Group</option>
<option value="1">Admin</option>
</select>
如何在表单中创建必填字段并在选择零“0”值时显示错误消息。
答案 0 :(得分:18)
默认情况下,此选项将标记为“已选择”。你想要一个多选下拉菜单,对吗?
<select name="schoolGroups[]" multiple="multiple">
<option value="0" selected="selected">Select User Group</option>
<option value="1">Admin</option>
</select>
至于验证,您可能想要构建自己的验证规则:
你的控制器的方法:
//...
$this->form_validation->set_rules('schoolGroups','School groups','required|callback_check_default');
$this->form_validation->set_message('check_default', 'You need to select something other than the default');
//...
添加其他方法:
function check_default($array)
{
foreach($array as $element)
{
if($element == '0')
{
return FALSE;
}
}
return TRUE;
}
如果您只想要一个选择(无法多选),那就更容易了:
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');
$this->form_validation->set_message('check_default', 'You need to select something other than the default');
回调:
function check_default($post_string)
{
return $post_string == '0' ? FALSE : TRUE;
}
答案 1 :(得分:2)
正确的方法是将默认选项的值设置为空!然后,您可以使用简单的form_validation规则,例如文本字段:
<select name="schoolGroups">
<option value="">Select User Group</option>
<option value="1">Admin</option>
</select>
$this->form_validation->set_rules('schoolGroups','School groups','required');
答案 2 :(得分:1)
这个对我有用。
观点
<select name="schoolGroups[]" multiple="multiple">
<option value="">Select User Group</option>
<option value="1">Admin</option>
</select>
控制器
$this->form_validation->set_rules('schoolGroups','School groups','callback_check_default');
<强> CALLBACK 强>
function select_validate()
{
$choice = $this->input->post("schoolGroups");
if(is_null($choice))
{
$choice = array();
}
$schoolGroups = implode(',', $choice);
if($schoolGroups != '') {
return true;
} else {
$this->form_validation->set_message('select_validate', 'You need to select a least one element');
return false;
}
}