我使用CodeIgniter的表单帮助器和表单验证库来构建我的表单.我无法使下拉菜单“粘稠”,也找到适当的验证规则.
这是我如何填充下垂:
foreach($events as $event){ $options[$event->event_title] = $event->event_title; } $firstItem = '<option>Please select one...</option>'; echo form_dropdown('events',$options,'',$firstItem);
这是从存储在数据库中的事件构建选项.表单看起来很好,并正确填充所有字段.
不过,当我提交表单时,下拉菜单不会保留所选的值?此外,我应该如何验证它,我想让它需要,但我也想确保我除了下拉菜单中的第一个选项“请选择一个…”
提前致谢.
干杯,
GAZ
解决方法
你在看这个吗?我会告诉你我已经处理了,但这一切都发生在控制器中:
// first,we can set a validation rule for the input 'country' (our dropdown),in this case it is required,and must be a natural number. You can look up more rules in the CI user guide,and you can write your own functions as well and add them to the 3rd parameter here. I believe some native PHP functions can be used as well. $this->form_validation->set_rules('country','Country','required|is_natural'); // the form is not valid! we'll enter this block whenever the form validation rules above are not met,as well as when first going to this controller-action. if ($this->form_validation->run() == FALSE) { // buid your form,there's some CI functions to help with this that I'm using $my_form = form_open('user/edit','class="superform"') . form_fieldset() . '<ol>' . '<li>' . form_label('Country<br/>','country') // so here is the dropdown,matching the name given to the validation rule we've set,the second parameter takes an array,which I am grabbing from a model,the last parameter is the 'selected; value,which I am grabbing from some variable,if it's not present the first item in the dropdown will obvIoUsly be selected . form_dropdown('country',$this->Country_model->get_countries_dropdown(),$user->country) . form_error('country',' <em>','</em>' . form_submit('mysubmit','Save','class="button"') . '</li>' . '</ol>' . form_fieldset_close() . form_close() ); // sending the form variable to my view,where i will simply <?=$my_form?> it $this->load->view('user_edit',$my_form); } else { // form has validated! do something! }
form_dropdown()函数使用一个数组,如下所示:
$key => $值
我的案件中的关键字是国家编号,值是国家名称.我有对’0’=>在我的国家/地区数组的开始,“NONE”,所以用户不能选择一个.如果我想要这样做需要你的情况,我可以把它设置为’-1’=> “请选择…”,它不会验证,因为-1不是自然数.
希望我的漫游有帮助!
编辑:
好的,所以在使用form_dropdown()创建下拉菜单之前,您要做的是检查来自POST数组的选定值.
在CI的情况下,您可以使用函数set_value($input),所以在我的示例窗体中,我可能会执行以下操作:
$selected = (!empty(set_value('country'))) ? set_value($country) : ''; form_dropdown('country',$selected)
所以现在,下拉列表的选定值将被设置为在最后一个帖子中选择的值.您可能需要检查该值以确保其有效.如果没有选择任何内容,那么您可以将$select设置为数据库中当前的值,或者您选择的默认值.