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選擇國家下拉菜單顯示狀態列表框帶有多個選項而不刷新頁面。但選擇2或3國在另一個lisbox不顯示所有城市。城市只展示一個國家。幫助狀態的多選列表框不在另一個列表框中顯示所有城市
loadData.php
<?php
$q = $_GET['q'];
$con = mysqli_connect('localhost','root','','test');
if (!$con) {
die('Could not connect: ' . mysqli_error($con));
}
mysqli_select_db($con,"test");
$sql="SELECT * FROM state WHERE country_id = '".$q."'";
$result = mysqli_query($con,$sql);
echo "<select name='try[]' onchange='showSecondUser(this.value)' multiple>";
while($row = mysqli_fetch_array($result)){
echo "<option value='".$row['id']."'>".$row['state_name']."</option>";
}
echo" </select>";
$g = $_GET['g'];
$sql="SELECT * FROM city WHERE state_id = '".$g."'";
$result = mysqli_query($con,$sql);
echo "<select name='try' multiple>";
while($row = mysqli_fetch_array($result)){
echo "<option value=''>".$row['city_name']."</option>";
}
echo" </select>";
mysqli_close($con);
?>
的index.php
<html>
<head>
<script>
function showUser(str) {
if (str=="") {
document.getElementById("txtHint").innerHTML="";
return;
}
if (window.XMLHttpRequest) {
// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp=new XMLHttpRequest();
} else { // code for IE6, IE5
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange=function() {
if (xmlhttp.readyState==4 && xmlhttp.status==200) {
document.getElementById("txtHint").innerHTML=xmlhttp.responseText;
}
}
xmlhttp.open("GET","loadData.php?q="+str,true);
xmlhttp.send();
}
function showSecondUser(str) {
if (str=="") {
document.getElementById("txtHint2").innerHTML="";
return;
}
if (window.XMLHttpRequest) {
// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp=new XMLHttpRequest();
} else { // code for IE6, IE5
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange=function() {
if (xmlhttp.readyState==4 && xmlhttp.status==200) {
document.getElementById("txtHint2").innerHTML=xmlhttp.responseText;
}
}
xmlhttp.open("GET","loadData.php?g="+str,true);
xmlhttp.send();
}
</script>
</head>
<body>
<form>
<select name="users" onchange="showUser(this.value)">
<option value="">Select Country</option>
<option value="1">Australia</option>
<option value="2">Japan</option>
<option value="3">Russia</option>
<option value="4">Germany</option>
</select>
</form>
<br>
<div id="txtHint"></div>
<div id="txtHint2"></div>
</body>
</html>
如何選擇查詢申請$ G值,如果$ G有三個值 – 2014-10-10 20:21:59
是'$ g'數組或字符串?如果字符串是如何分開的數字? – 2014-10-10 20:26:16
$ g是值,我從index.php頁面從這一行獲得。 'xmlhttp.open(「GET」,「loadData.php?g =」+ str,true);'如果我在$ g中獲得單值,如何獲取多個值? – 2014-10-11 01:52:06