该应用程序用于跟踪库存电缆的数量。
因此，我正在努力工作的应用程序部分如下。
当用户从下拉框中选择某些内容时，它会查询 MySQL 数据库并返回一个整数。每个选择只有 1 个整数。例如，用户从下拉框中选择 5 米橙色电缆，它将显示剩余的电缆数量。其存储在mysql数据库中。如果有人可以提供一些帮助，我正在经历一场噩梦，让代码正常工作。
这是主页
<html>
<head>
<title>Cable Management</title>
<link href="style.css" rel="stylesheet">
</head>
<body>
<div class="wrapper">
<?php include("Header.php"); ?>
<div id="main">
<h1>Cable Management</h1>
<h2>Bournemouth Office</h2>
<p>Enter how many cables you want to remove or add from the Bournemouth office</p>
<script>
function showcables(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","getcable.php?q="+str,true);
xmlhttp.send();
}
</script>
</head>
<body>
<form>
<INPUT TYPE = "TEXT" NAME='amount' VALUE ="">
<select name="cables" onchange="showcables(this.value)">
<option value="">Select a cable type</option>
<option value="0.25 Metre Orange">0.25 Metre Orange</option>
<option value="0.3 Metre Orange">0.3 Metre Orange</option>
<option value="0.5 Metre Orange">0.5 Metre Orange</option>
<option value="1 Metre Orange">1 Metre Orange</option>
<option value="2 Metre Orange">2 Metre Orange</option>
<option value="3 Metre Orange">3 Metre Orange</option>
<option value="5 Metre Orange">5 Metre Orange</option>
<option value="10 Metre Orange">10 Metre Orange</option>
<option value="2 Metre Black">2 Metre Black</option>
<option value="3 Metre Black">3 Metre Black</option>
<option value="5 Metre Black">5 Metre Black</option>
<option value="10 Metre Black">10 Metre Black</option>
<option value="RJ 11">RJ11</option>
<option value="RJ 11 to BT">RJ11 to BT</option>
</select>
<INPUT TYPE = "button" Name = "Remove" VALUE = "Remove">
<INPUT TYPE = "button" Name = "Add" VALUE = "Add">
</form>
<br>
<div id="txtHint"><b>The amount of cables of that type will be listed here</b></div>
</select>
</div>
<div class="footer-clear"></div><!-- add this at the end of wrapper -->
</div> <!-- i added this closing tag, it was missing (for wrapper) -->
<?php include("Footer.php"); ?> <!-- move footer to go outside of wrapper -->
</body>
</html>
这是 getcable.php 文件
<?php
$q = intval($_GET['q']);
$con = mysqli_connect('localhost','root','','cables');
if (!$con)
{
die('Could not connect: ' . mysqli_error($con));
}
mysqli_select_db($con,"bmouthoff");
$sql="SELECT * FROM bmouthoff WHERE id = '".$q."'";
$result = mysqli_query($con,$sql);
while($row = mysqli_fetch_array($result))
{
echo "<tr>";
echo "<td>" . $row['Amount'] . "</td>";
echo "</tr>";
}
echo "</table>";
mysqli_close($con);
?>
提前致谢
最佳答案
您需要输入:
echo "<table>";
之前:
while($row = mysqli_fetch_array($result))
在 PHP 中。
摆脱mysqli_select_db($con, "bmouthoff")。这不是数据库的名称，并且您已经在 mysqli_connect() 调用中选择了数据库。
die("Could not connect: " . mysqli_error($con));
应该是:
die("Could not connect: " . mysqli_connect_error());
并更改:
$result = mysqli_query($con,$sql);
至:
$result = mysqli_query($con,$sql) or die ("Could not query: " . mysqli_error($con));
关于php - 如何让php/ajax从mysql获取整数，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/19450815/