How to code jquery in codeigniter
I have the following controller and view. I am trying to learn jquery in codeigniter.
The code does not work. So I am hoping someone spot out what I am doing wrong and correct me.
Thanks in advance.
class PhpJqueryBook extends Controller
{
function __construct()
{
parent::Controller(); }
public function index()
{
... }
function dynamic_select_boxes(){
$this->load->view('dynamic_select_boxes');
}
function get_cities(){
switch(@$_POST['country']){
case 'ie': // { ireland
$cities=array('Cork', 'Dublin', 'Galway', 'Limerick',
'Waterford');
break;
// }
case 'uk': // { United Kingdom
$cities=array('Bath', 'Birmingham', 'Bradford',
'Brighton & Hove', 'Bristol',
'Cambridge', 'Canterbury', 'Carlisle',
'Chester', 'Chichester', 'Coventry',
'Derby', 'Durham', 'Ely', 'Exeter',
'Gloucester', 'Hereford', 'Kingston upon Hull',
/* and on and on! */
'Newport', 'St David\'s', 'Swansea');
break;
// }
default: // { else
$cities=false;
// }
}
if(!$cities)echo 'please choose a country first';
else echo '<select name="city"><option>'.join('</option> <option>',$cities).'</select>';
}
}
views/dynamic_select_boxes.php
<?php $this->load->view('inc/header')?>
<form>
<table>
<tr><th>Country</th><td>
<select name="country" id="country">
<option value=""> -- please choose -- </option>
<option value="ie">Ireland</option>
<option value="uk">Great Britain</option>
<开发者_如何学JAVA/select>
</tr>
<tr>
<th>Cities</th>
<td id="cities">please choose a country first</td>
</tr>
</table>
<?php $this->load->view('inc/footer')?>
And this produces the following html.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<base href="http://127.0.0.1/ci_jquery/">
</head>
<body>
<form>
<table>
<tr><th>Country</th><td>
<select name="country" id="country">
<option value=""> -- please choose -- </option>
<option value="ie">Ireland</option>
<option value="uk">Great Britain</option>
</select>
</tr>
<tr>
<th>Cities</th>
<td id="cities">please choose a country first</td>
</tr>
</table>
<script language="javascript" type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.0/jquery.min.js"></script>
<script type="text/javascript">
$(document).ready(setup_country_change);
function setup_country_change(){
$('#country').change(update_cities);
}
function update_cities(){
var country=$('#country').attr('value');
$.get('phpjquerybook/get_cities/'+country, show_cities);
}
function show_cities(res){
$('#cities').html(res);
}
</script>
</body>
</html>
To get the third parameter in a method of a controller you can easily use the parameters of the method to get these, or the uri class to get the segments. In the first case you would use
function get_cities($country = null){
switch($country){
....
see codeigniter userguide for passing uri parameters to controllers and uri library.
It's because of the way you are attempting to identify the city. You are sending a GET request via Ajax with Jquery on this line:
$.get('phpjquerybook/get_cities/'+country, show_cities);
However, in your get_cities() function, you are checking $_POST for the requested country. $_POST will be empty if you are sending a GET request.
The best thing to do here would be to change this line:
switch(@$_POST['country'])
to
switch($_GET['country'])
An alternate solution would be to modify your JQuery call to be a $.post() instead.
I highly recommend you don't use the @ operator while developing either, unless you really need it for specific functionality. You would have noticed this if you hadn't suppressed the error about $_POST['country'] not being set. It is better practice to fix your errors than suppress them.
加载中,请稍侯......
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