Hi all,
I have taken from net chained select script.
here is all PHP and Javascript files but i dont understand one thing there.
index.php file
<?php
include('db.php');
include('func.php');
?>
<!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>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Chained Select Boxes using PHP, MySQL and jQuery</title>
<script type="text/javascript" src="jquery-1.4.1.min.js"></script>
<script type="text/javascript">
$(document).ready(function() {
$('#wait_1').hide();
$('#drop_1').change(function(){
$('#wait_1').show();
$('#result_1').hide();
$.get("func.php", {
func: "drop_1",
drop_var: $('#drop_1').val()
}, function(response){
$('#result_1').fadeOut();
setTimeout("finishAjax('result_1', '"+escape(response)+"')", 400);
});
return false;
});
});
function finishAjax(id, response) {
$('#wait_1').hide();
$('#'+id).html(unescape(response));
$('#'+id).fadeIn();
}
</script>
</head>
<body>
<p>
<form action="" method="post">
<select name="drop_1" id="drop_1" size="4">
<option value="" selected="selected" disabled="disabled">Select a Category</option>
<?php getTierOne(); ?>
</select>
<span id="wait_1" style="display: none;">
<img alt="Please Wait" src="ajax-loader.gif"/>
</span>
<span id="result_1" style="display: none;"></span>
</form>
</p>
<p>
<?php if(isset($_POST['submit'])){
$drop = $_POST['drop_1'];
$tier_two = $_POST['tier_two'];
echo "You selected ";
echo $drop." & ".$tier_two;
}
?>
<p><a href="three-tier/">View 3 Tier Select Box Example</a></p>
</body>
</html>func.php file
<?php
//**************************************
// Page load dropdown results //
//**************************************
function getTierOne()
{
$result = mysql_query("SELECT DISTINCT tier_one FROM two_drops")
or die(mysql_error());
while($tier = mysql_fetch_array( $result ))
{
echo '<option value="'.$tier['tier_one'].'">'.$tier['tier_one'].'</option>';
}
}
//**************************************
// First selection results //
//**************************************
if($_GET['func'] == "drop_1" && isset($_GET['func'])) {
drop_1($_GET['drop_var']);
}
function drop_1($drop_var)
{
include_once('db.php');
$result = mysql_query("SELECT * FROM two_drops WHERE tier_one='$drop_var'")
or die(mysql_error());
echo '<select name="tier_two" id="tier_two" size="4">
<option value=" " disabled="disabled" selected="selected">Choose one</option>';
while($drop_2 = mysql_fetch_array( $result ))
{
echo '<option value="'.$drop_2['tier_two'].'">'.$drop_2['tier_two'].'</option>';
}
echo '</select> ';
echo '<textarea rows="15 cols="12">dgd gdfg dgdfg</textarea>';
echo '<input type="submit" name="submit" value="Submit" />';
}
?>But i didnt understand what is
if($_GET['func'] == "drop_1" && isset($_GET['func'])) {
drop_1($_GET['drop_var']);
}in func.php file.
where is $_GET option. where is $_GET method used?
thanks inadvance!
