这是一个显示类别列表的文件..在我从下拉列表中选择类别后,它会填充子类别列表。我正在使用javascript。第二个文件是getuser3.php,它在下面发布....代码工作正常。 现在这就是我想要的..在提交表单时,我希望选择的值在select标签中显示为选中.. 例如:如果我选择了类别为“ELECTRONICS”而子类别为“MOBILES”,那么在提交表格后,这两个值都应显示为选中。
<script>
function showUser(str) {
if (str=="") {
document.getElementById("txtHint").innerHTML="";
return;
}
if (window.XMLHttpRequest) {
// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp=new XMLHttpRequest();
} else { // code for IE6, IE5
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange=function() {
if (xmlhttp.readyState==4 && xmlhttp.status==200) {
document.getElementById("txtHint").innerHTML=xmlhttp.responseText;
}
}
xmlhttp.open("GET","getuser3.php?q="+str,true);
xmlhttp.send();
}
</script>
</head>
<body>
<?php
$users="";
if(isset($_POST['users']))
{
$users=$_POST['users'];
}
$item24="";
if(isset($_POST['item24']))
{
$item24=$_POST['item24'];
}
?>
<form method="post" action="categories_sample3.php">
<?php
$x="";
$sql2 = "SELECT DISTINCT categories FROM categories_offline ORDER BY categories";
$result2 = mysql_query($sql2);
echo "<select name='users' onchange='showUser(this.value)'>";
echo "<option value='" . "Select Category" ."'".">"."Select Category"."</option>";
while ($row2 = mysql_fetch_array($result2))
{
if($row2['categories'] == $users)
{
$x="selected";
}
else
{
$x="";
}
echo "<option value='" . $row2['categories'] ."'".$x.">" . $row2['categories'] ."</option>";
echo $x;
}
echo "</select>";
echo "<br><br>";
echo "<div id='txtHint' name='sunny'> </div>";
?>
<input type="submit" name="submit" value="submit">
</form>
<?php
$q = $_GET['q'];
include("db_connect.inc");
session_start();
$sql="SELECT sub_category FROM categories_offline WHERE categories = '$q' ORDER BY sub_category";
$result = mysql_query($sql);
$x="";
echo "<select name='item24'>";
while($row = mysql_fetch_array($result))
{
echo "<option value='" . $row['sub_category'] ."'".$x.">" . $row['sub_category'] ."</option>";
}
echo "</select>";
?>
答案 0 :(得分:0)
在form
<div id="txtHint"><b>Person info will be listed here.</b></div>
由于您的子类别select
位于表单之外,因此您无法发布该值。