Question

我有一个选择框，最多包含20个选项，例如，如果选择了选项5或任何其他选项并将其保存在特定列中的数据库中，则下次不会显示...
请引导我

<select class="form-control text-center" name="code" id="Code"    >
        <option value="">Select Code</option>
        <?php for($i = 1; $i <= 20; $i++){ ?>
            <option value="<?php echo $i; ?>"><?php echo $i; ?></option>
        <?php } ?>
</select>

Answer 1

控制器

public function get_selected(){
    $this->load->model('model_name');
    $data['selected'] = $this->model_name->function_name($_SESSION['username']); 
    //Already saved values will be get on the basis of any condition

    return $this->load->view('file.php');
}

模型

public function function_name($username){
    return $this->db->get_where('table', ['created_by' => $username])->row()->value;
}

现在您已经在$selected

中获得了选定的值

<select class="form-control text-center" name="code" id="Code"    >
    <option value="">Select Code</option>
     <?php for($i = 1; $i <= 20; $i++){ 
              if($i != $selected)?>
                 <option value="<?php echo $i; ?>"><?php echo $i; ?></option>
     <?php } } ?>
</select>

Answer 2

您可以这样处理

$availableOption = range(1,20);
$selectedOrInDb  = [5,6,8,9]; // Selected OR from DB
$remaining = array_diff($availableOption, $selectedOrInDb);

现在您可以使用$remaining进行遍历

<select class="form-control text-center" name="code" id="Code"    >
    <option value="">Select Code</option>
    <?php foreach($remaining as $key => $value){ ?>
        <option value="<?php echo $value; ?>"><?php echo $value; ?></option>
    <?php } ?>
</select>

Answer 3

控制器：

function index(){
   //below code should be in Model this is only for example
   $this->db->select('code');
   $query = $this->db->get_where('hr_levels', array('created_by' => $_SESSION['username']));
   if ($query->num_rows() > 0) {
        $code = $query->row('code');
   } else {
        $code = 0;
   }
   $option = array();
   for($i=1;$i<=20;$i++){
      if ($code != $i) {//no need to add if in view, just pass the data to view
         $option[$i] = $i;
      }
   }
   $data['options'] = $option;
   $this->load->view('option_view',$data);
}

视图：

<select class="form-control text-center" name="code" id="Code"    >
    <option value="">Select Code</option>
     <?php foreach($options as $key => $value){ 
           <option value="<?php echo $key; ?>"><?php echo $value; ?></option>
     <?php } ?>
</select>

如果已经在数据库中选择了，则取消选择选项...？

3 个答案: