创建登录页面，但单击按钮不会显示任何数据或错误消息
[英]creating a login page but button click doesn't show any data or error messages
问题描述
When i click on the submit button it doesn't show any error and does not respond with any message.after a click it only reload itself and doesn't show any data. 
当我单击提交按钮时，它不显示任何错误，也不响应任何消息。单击后，它仅重新加载自身，不显示任何数据。 please reply me with the error. 请以错误答复我。
I found I missed the tag. 我发现我错过了标签。 It was a silly mistake. 这是一个愚蠢的错误。
<?php
$server="localhost";
$username="root";
$password="admin007#";
$dbname="demo";
$con=new mysqli($server,$username,$password,$dbname);
if(!$con)
{
die('error connecting to the database');
}
if(isset($_POST['login'])){
$a=mysqli_real_escape_string($con, $_POST['user']);
$b=mysqli_real_escape_string($con, $_POST['pass']);
$sql="SELECT * FROM login WHERE username='$a' AND password='$b'";
$result=mysqli_query($con, $sql);
$check=mysqli_num_rows($result);
if($check>0){
echo "you are logged in";
}
else
{
echo "Error";
}
}
?>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
</head>
<body>
<tr>
<td>Username:</td>
<td><input type="text" name="user" value=""/></td>
</tr>
<br /><br />
<tr>
Password:
<td><input type="password" name="pass" value=""/></td>
</tr>
<br />
<tr align="center">
<td colspan="2"><input type="submit" name="login" value="Log In"/></td>
</tr>
</body>
</html>
2 个解决方案
解决方案1
2 已采纳 2016-10-19 09:15:11
There is a <form> Tag missing 缺少<form>标记
<body>
<form action="#" method="post">
<tr>
<td>Username:</td>
<td>
<input type="text" name="user" value="" />
</td>
</tr>
<br />
<br />
<tr>
Password:
<td>
<input type="password" name="pass" value="" />
</td>
</tr>
<br />
<tr align="center">
<td colspan="2">
<input type="submit" name="login" value="Log In" />
</td>
</tr>
</form>
</body>
解决方案2
0 2016-10-19 09:20:19
The <form method="post"> around the input fields is missing. 输入字段周围的<form method="post">丢失了。 Besides that, the <table> is also missing :) 除此之外， <table>也丢失了:)
Make the magic happen with something like: 通过以下方式使魔术发生：
<body>
<form method="post">
<table>
<tr>
<td>Username:</td>
<td><input type="text" name="user" value=""/></td>
</tr>
<tr>
Password:
<td><input type="password" name="pass" value=""/></td>
</tr>
<tr align="center"><td colspan="2"><input type="submit" name="login" value="Log In"/></td></tr>
</table>
</form>
</body>
PS: No <br> Tags between <tr> Tags - thats semantic nonsense (use CSS instead) ... and modern day HTML developers will go full rage when you use <table> tags for layout purposes :) PS：在<tr>标记之间没有<br>标记-多数民众赞成在语义上的废话（改用CSS）...并且当您将<table>标记用于布局目的时，现代HTML开发人员会大吃一惊:)
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