通过w3school的一些帮助,我设法为out数据库创建了一个下拉列表,可以获取有关某个产品的数据。该功能做得很好,但我想为用户添加一个选项来决定他们想要的产品数量。为了帮助我,我想要一个下拉菜单,简单地将从第一个数据库获得的价格乘以,如果可能的话。
PHP如下
<?php
$con = mysqli_connect('localhost','root2','1234','LSnet');
if (!$con) {
die('Could not connect: ' . mysqli_error($con));
}
$con->query('SET CHARACTER SET utf8');
if(isset($_GET['q']))
$q = intval($_GET['q']);
mysqli_select_db($con,'LSnet');
$sql = "SELECT * FROM Produkter Where id = '".$q."'";
$result = mysqli_query($con,$sql)
or die("Error: ".mysqli_error($con));
echo "<table>
<tr>
<th>Pris</th>
</tr>";
while($row = mysqli_fetch_array($result)) {
echo "<td>" . $row['ProduktPris'] . ' DKK' . "</td>";
}
echo "</table>";
mysqli_close($con);
?>
,HTML如下
<script>
function showUser(str) {
if (str == "") {
document.getElementById("txtHint").innerHTML = "";
return;
} else {
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 (this.readyState == 4 && this.status == 200) {
document.getElementById("txtHint").innerHTML = this.responseText;
}
};
xmlhttp.open("GET","../../prisdatabase.php?q="+str,true);
xmlhttp.send();
}
}
</script>
<body>
<form>
<select class="pris" name="NetTyper" onchange="showUser(this.value)">
<option value="">Vælg Nettype</option>
<option value="1">KampNet</option>
<option value="2">TræningNet</option>
</select>
</form>
<br>
<div id="txtHint"><b>Vælg Nettype her</b></div>
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Added short overview of my table in the database.
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来自第一选项的预期输出将是595 DKK,如果需要几个,我希望可以选择乘以