如何在Codeigniter中將set_select與Ajax結合使用

Question

我需要使用set_select，但是select2的選項是使用ajax從控制器調用的。 我能怎么做？

我的控制器：

public function getCategoryByLocation()
{
    $location_id = $this->input->post('location_id');
    $locationscats = $this->Categories_model->getCategorylocal($location_id);
    if(count($locationscats) > 0)
    {
        $select = '';
        $select .= '<option value="">'.$this->lang->line('text_none').'</option>';
        foreach ($locationscats as $locationscat) {
            $select .='<option value="'.$locationscat->category_id.'">'.$locationscat->name.'</option>';
        }
        echo json_encode($select);
    }else{
        $select = '';
        $select .= '<option value="">'.$this->lang->line('text_none').'</option>';
        echo json_encode($select);
    }

}

我的模特：

public function getCategorylocal($location_id)
{
    $query = $this->db->get_where('categories', array('location_id' => $location_id));
    return $query->result();
}

我的觀點：

<select name="parent_id" id="category" class="form-control">
                            <option value=""><?php echo lang('text_none'); ?></option>                          
                        </select>

還有Ajax電話

$(document).ready(function() {
$('#input-location').on('change', function() {
    var location_id = this.value;
    $.ajax({
        url:"<?php echo site_url("/categories/getCategoryByLocation"); ?>",
        type: "POST",
        data: {'location_id' : location_id},
        dataType: 'json',
        success: function(data){
            $('#category').html(data);
        },
        error: function(){
            alert('Error occur...!!');
        }
    });
});
$("#input-location").trigger('change');});

可以從控制器中使用set_select嗎？...我在視圖中使用set_select，但在控制器中沒有...

Answer 1

我看不到在視圖中使用set_select的位置，但是由於您要返回選項的HTML片段，因此無需執行json編碼就可以返回視圖。

$this->load->view('view_that_builds_options', $this->locationscats);

或構建$ select var並回顯...

public function getCategoryByLocation() {

 $this->load->helper('form');

 $location_id = $this->input->post('location_id');
 $locationscats = $this->Categories_model->getCategorylocal($location_id);

  $select .= '<option value="">'.$this->lang->line('text_none').'</option>';

 if(count($locationscats) > 0) {

    foreach ($locationscats as $locationscat) {
       $select .='<option value="'.$locationscat->category_id.'">'

       // assume your select is named 'category' by the id='category'.
       $select .= set_select('category', $NoIdeaWhatValueYouAreCheckingForGoesHere);

       $select .= $locationscat->name.'</option>';
    }

}

echo $select;

}