AJAX ??????
PHP - AJAX ? MySQL
AJAX? ???? ??????? ????? ??? ? ????.
AJAX ?????? ????
?? ???? ? ???? AJAX? ?? ???????? ??? ?? ??? ?????.
?
?? ??: Peter Griffin Lois Griffin Joseph Swanson Glenn Quagmire
?? ??? ???? ??? ??? ??? ?????...
?? ?? - MySQL ??????
? ???? ??? ?????? ???? ??? ????.
?? ?? - HTML ???
???? ???? ?? ?? ???? ???? ???? ???? "showUser()"?? ??? ?????. ? ??? "onchange" ???? ?? ??????.
<html>
<head>
<script>
function showUser(str)
{
if (str=="")
{
document.getElementById("txtHint").innerHTML="";
return;
}
if (window.XMLHttpRequest)
{
// IE7+, Firefox, Chrome, Opera, Safari 瀏覽器執(zhí)行代碼
xmlhttp=new XMLHttpRequest();
}
else
{
// IE6, IE5 瀏覽器執(zhí)行代碼
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange=function()
{
if (xmlhttp.readyState==4 && xmlhttp.status==200)
{
document.getElementById("txtHint").innerHTML=xmlhttp.responseText;
}
}
xmlhttp.open("GET","getuser.php?q="+str,true);
xmlhttp.send();
}
</script>
</head>
<body>
<form>
<select name="users" onchange="showUser(this.value)">
<option value="">Select a person:</option>
<option value="1">Peter Griffin</option>
<option value="2">Lois Griffin</option>
<option value="3">Glenn Quagmire</option>
<option value="4">Joseph Swanson</option>
</select>
</form>
<br>
<div id="txtHint"><b>Person info will be listed here.</b></div>
</body>
</html>showUser() ??? ?? ??? ?????.
1) ???? ?????? ??
2) XMLHttpRequest ?? ??
3) ?? ??? ???? ???? ?? ??
4) ??? ??? ?? ???
5) ?? ?? URL(q ) ?? ??? ????(???? ??? ?? ??)
PHP ??
?? ??? JavaScript? ?? ??? ???? "getuser.php" PHP ????? ???.
"getuser.php"? ?? ??? MySQL ??????? ?? ??? ???? ??? HTML ???? ?????.
<?php
$q=$_GET["q"];
$con = mysqli_connect('localhost','peter','abc123','my_db');
if (!$con)
{
die('Could not connect: ' . mysqli_error($con));
}
mysqli_select_db($con,"ajax_demo");
$sql="SELECT * FROM user WHERE id = '".$q."'";
$result = mysqli_query($con,$sql);
echo "<table border='1'>
<tr>
<th>Firstname</th>
<th>Lastname</th>
<th>Age</th>
<th>Hometown</th>
<th>Job</th>
</tr>";
while($row = mysqli_fetch_array($result))
{
echo "<tr>";
echo "<td>" . $row['FirstName'] . "</td>";
echo "<td>" . $row['LastName'] . "</td>";
echo "<td>" . $row['Age'] . "</td>";
echo "<td>" . $row['Hometown'] . "</td>";
echo "<td>" . $row['Job'] . "</td>";
echo "</tr>";
}
echo "</table>";
mysqli_close($con);
?>??: ?? JavaScript? PHP ??? ???? ??? ?? ?? ?????.
1. PHP? MySQL ??????? ?? ??? ???.
2. ??? ???? ????.
3. HTML ???? ???? ???? ??? ? "txtHint" ?? ???? ?? ????
