動態(tài)填充的下拉框
在此示例中，我們的目標是創(chuàng)建一個動態(tài)下拉框，其中第二個下拉列表中的選項框取決于第一個下拉框中所做的選擇。
這是您的修改版本代碼：
tester.php
<html>
<head>
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<script type="text/javascript">
$(function() {
$('#stSelect').change(function() {
var sel_stud = $(this).val();
$.ajax({
type: "POST",
url: "another_php_file.php",
data: 'theOption=' + sel_stud,
success: function(whatigot) {
$('#LaDIV').html(whatigot);
}
});
});
});
</script>
</head>
<body>
<select name="students">another_php_file.php
<?php
$server = 'localhost'; //localhost is the usual name of the server if apache/Linux.
$login = 'root';
$pword = '';
$dbname = 'test';
mysql_connect($server,$login,$pword) or die($connect_error); //or die(mysql_error());
mysql_select_db($dbname) or die($connect_error);
//Get value posted in by ajax
$sel_stud = $_POST['theOption'];
//Run DB query
if($sel_stud == "Electronics"){
$query = "SELECT * FROM `category` WHERE `master` = 1";
}elseif($sel_stud == "Clothes"){
$query = "SELECT * FROM `category` WHERE `master` = 2";
}else{
$query = "SELECT * FROM `category` WHERE `master` = 3";
}
$result = mysql_query($query) or die('Fn another_php_file.php ERROR: ' . mysql_error());
$num_rows_returned = mysql_num_rows($result);
//Prepare response html markup
$r = '
<select>
';
//Parse mysql results and create response string. Response can be an html table, a full page, or just a few characters
if ($num_rows_returned > 0) {
while ($row = mysql_fetch_assoc($result)) {
$r = $r . '<option value="' .$row['id']. '">' . $row['name'] . '</option>';
}
} else {
$r = '<p>No Items</p>';
}
echo $r;
在此示例中，選項第二個下拉框中的內容將根據第一個下拉框中選擇的值動態(tài)填充。類別表已修改為包含一個主字段，用于對第二個下拉框中的選項進行分組。
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