我需要有关如何根据第一个选择框获取第二个选择框的值的帮助
这是视图:
$(document).ready(function() {
$('#state').change(function() {
// Get an instance of the select, and it's value.
var state = $(this),
stateID = state.val();
// Add if statement to check if the new state id
// is different to the last to prevent loading the same
// data again.
// Do the Ajax request.
$.ajax({
url : 'http://localhost/ci_ajax/select/get_cities/'+stateID, // Where to.
dataType : 'json', // Return type.
success : function(data) { // Success :)
// Ensure we have data first.
if(data && data.Cities) {
// Remove all existing options first.
state.find('option').remove();
// Loop through each city in the returned array.
for(var i = 0; i <= data.Cities.length; i++) {
// Add the city option.
state.append($('option').attr({
value : data.Cities[i].value
}).text(data.Cities[i].city));
}
}
},
error : function() {
// Do something when an error happens?
}
});
}); });
<form action="" method="post">
<select name="state" id="state">
<option>Select</option>
<?php foreach($states as $row):?>
<option value="<?php echo $row->id?>"><?php echo $row->states;?></option>
<?php endforeach;?>
</select>
<select id="cities" name="cities">
<option>Select</option>
</select>
这是控制器:
类选择扩展 CI_Controller{
function index(){
$data['states']=$this->load_state();
$this->load->view('form',$data);
}
function load_state(){
$this->load->model('data_model');
$data['states']=$this->data_model->getall_states();
return $data['states'];
}
function get_cities() {
// Load your model.
$this->load->model('data_model');
// Get the data.
$cities = $this->data_model->get_cities();
// Specify that we're returning JSON.
header('content-type: application/json');
// Return a JSON string with the cities in.
return json_encode(array('Cities' => $cities));
}
}
这是模型:
类 Data_model 扩展 CI_Model{
function getall_states(){
$query=$this->db->get('states');
if($query->num_rows()>0){
foreach($query->result() as $row){
$data[]=$row;
}
return $data;
}
}
function get_cities(){
$this->db->select('id,cities');
$this->db->from('cities');
$this->db->where('s_id',$this->uri->segment(3));
$query=$this->db->get();
if($query->num_rows()>0){
foreach($query->result() as $row){
$data[]=$row;
}
return $data;
}
}
}
请对此提供帮助,希望能提供正确的代码。