如何将数据库中的数据加载到选择框中？此选择框依赖于另一个选择框。
我需要更新我的产品的详细信息。当我单击表中的特定产品时，产品详细信息将加载到我的更新视图中。一切都很好，除了一个选择框，即size选择框，数据没有显示。
我尝试了很多解决方案，但没有一个能够解决问题。
这是我的产品表视图：
<div class="col-sm-10" id="main">
<div class="table-wrapper">
<div id="content">
<legend class="text-danger"><h1>Product List</h1></legend>
<?php $tableAttr = array(
'table_open' => '<table class="table table-responsive table-striped table-hover" id="item_tbl">',
);
$item_table = $this->table->set_heading('No.','PRODUCT CODE','PRODUCT DESCRIPTION','BRAND', 'CATEGORY', 'SIZE','ORIGINAL PRICE','ACTION');
$item_table = $this->table->set_template($tableAttr);
$num = 0;
foreach ($items as $item) {
$itemName = urlencode($item->prod_desc);
$num++;
$item_table = $this->table->add_row($num, $item->prod_code, $item->prod_desc, $item->brand_name,$item->category_name,$item->size,'₱'. $item->original_price,"
<a href='".base_url("item/update/$itemName")."'><button class='btn btn-info btn-sm'>EDIT</button></a>
");
}
echo $this->table->generate($item_table); ?>
</div>
</div>
</div>
因此，当我点击编辑按钮时，另一个形式为product_update_view.php：
<div class="col-sm-10" id="main" style="padding: 20px;">
<?php echo form_open("item/item_update/$item->prod_id");
echo form_fieldset('<h3 class="text-info">Update Item</h3>'); ?>
<input type="hidden" name="cur_code" value="<?php echo $item->prod_code ?>">
<input type="hidden" name="cur_name" value="<?php echo $item->prod_desc ?>">
<input type="hidden" name="cur_category" value="<?php echo $item->category_name ?>">
<input type="hidden" name="cur_brand" value="<?php echo $item->brand_name ?>">
<input type="hidden" name="cur_size" value="<?php echo $item->size ?>">
<input type="hidden" name="cur_price" value="<?php echo $item->original_price ?>">
<div class="form-group">
<label for='prod_code'>Product Code:</label>
<input type="text" name="up_code" class="form-control" value="<?php echo $item->prod_code; ?>">
</div>
<div class="form-group">
<label for='prod_name'>Product Description:</label>
<input type="text" name=up_name" class="form-control" value="<?php echo $item->prod_desc; ?>">
</div>
<div class="form-group">
<label for='prod_name'>Brand:</label>
<select name="brand" class="form-control">
<option value="Select Brand" selected="selected">Select Brand</option>
<?php foreach($brand as $br):?>
<option value="<?php echo $br->brand_id; ?>" <?php if ($br->brand_id == $item->brand_id) {echo "selected='selected'";} ?>><?php echo $br->brand_name?></option>
<?php endforeach;?>
</select>
</div>
<div class="form-group">
<label for="category">Category</label>
<select class="form-control" name="category" id="category">
<option value="Select Brand"> Select Category</option>
<?php foreach($category as $cat): ?>
<option value="<?php echo $cat->category_id; ?>" <?php if ($cat->category_id == $item->category_id) {echo "selected='selected'";} ?>><?php echo $cat->category_name; ?></option>
<?php endforeach; ?>
</select>
</div>
<div class="form-group">
<label for="sizes">Size:</label>
<select class="form-control" name="category" id="sizes">
<option value="Select size"> Select Size</option>
</select>
</div>
<div class="form-group">
<label for='prod_price'>Price:</label>
<input type="text" name="price" class="form-control" value="<?php echo $item->original_price; ?>">
</div>
<div class="form-group">
<input type="submit" name="submit_account" class="btn btn-primary" value="Save" >
</div>
</div>
<script src="<?php echo base_url() ?>dropdown/js/jquery.js"></script>
<script src="<?php echo base_url() ?>dropdown/js/bootstrap.min.js"></script>
<script type="text/javascript">
$(document).ready(function(){
$('#category').on('change', function(){
var category_id = $(this).val();
if(category_id === '')
$.ajax({
url:"<?php echo base_url() ?>welcome/get_sizes",
type: "POST",
data: {'category_id' : category_id},
dataType: 'json',
success: function(data){
$('#sizes').html(data);
},
error: function(){
alert('Error occur...!!');
}
});
}
});
});
</script>
</div>
<?php echo form_close(); ?>
控制器（item.php）：
public function update($name) {
$this->load->model('Dependent_model', 'dep_model', TRUE);
$this->load->model('brand_model');
$data['category'] = $this->dep_model->get_category_query();
$data['brand'] = $this->brand_model->getBrandName();
$this->load->model('item_model');
$data['item'] = $this->item_model->item_info($name);
$this->load->view('header');
$this->load->view('side_menu');
$this->load->view('product_update_view.php',$data);
$this->load->view('footer');
}
从属选择框的控制器（welcome.php）：
class Welcome extends CI_Controller {
public function __construct()
{
parent::__construct();
$this->load->model('Dependent_model', 'dep_model', TRUE);
}
public function index()
{
$data['category'] = $this->dep_model->get_category_query();
$this->load->view('new_product', $data);
}
public function get_sizes()
{
$category_id = $this->input->post('category_id');
$sizes = $this->dep_model->get_sizes_query($category_id);
if(count($sizes)>0)
{
$pro_select_box = '';
$pro_select_box .= '<option value="Select Size">Select Size</option>';
foreach ($sizes as $sz) {
$pro_select_box .='<option value="'.$sz->size_id.'">'.$sz->size.'</option>';
}
echo json_encode($pro_select_box);
}
}
}
模型（item_model.php）：
public function item_info ($itemName) {
$this->load->database();
$this->db->select('products.*,category.category_name,sizes.size,brand.brand_name')
->from('products')
->from('category');
$this->db->from('sizes');
$this->db->from('brand');
$this->db->where('products.category_id = category.category_id');
$this->db->where('products.size_id = sizes.size_id');
$this->db->where('products.brand_id = brand.brand_id');
$this->db->where('prod_desc', urldecode($itemName));
$result=$this->db->get();
return $result->row();
}
从属选择框模型（dependent_model）：
<?php
class Dependent_model extends CI_Model
{
public function __construct()
{
parent::__construct();
}
public function get_category_query()
{
$query = $this->db->get('category');
return $query->result();
}
public function get_sizes_query($category_id)
{
$query = $this->db->get_where('sizes', array('category_id' => $category_id));
return $query->result();
}
}
问题是它没有在product_update视图中显示特定产品的大小。
答案 0 :(得分：0)
替换此jquery。
middleware_home_dir