Question

这是第一页：Index.php

＆＃13;

Definition fret_dec' (x : nat) : { fret x } + { ~ fret x }.
Proof. right. intros contra. contradiction. Defined.

Theorem hello_decide' : forall x : nat , count fret fret_dec' x = 0.
Proof.
  induction x as [|x IH]; simpl.
  - reflexivity. 
  - exact IH.
Qed.

＆＃13;

第二页：Test2.php

＆＃13;

<?php
session_start();
?>
<!DOCTYPE html>
<html>

<head>
  <title>Index</title>
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
</head>

<body>
  <form name="Index" action="Result.php" method="POST">
    Username: <input type="text" name="username" id="username" autocomplete="off"><br><br> 1. I identify my gender as... <br> &ensp;&ensp;
    <input type="radio" name="gender" value="male">Male<br> &ensp;&ensp;
    <input type="radio" name="gender" value="female">Female<br> &ensp;&ensp;
    <input type="radio" name="gender" value="others">Others<br><br>
    <input type="submit" a href="Test2.php" name="submit" value="Submit">
  </form>
</body>

</html>
<?php
session_destroy();
?>

＆＃13;

第三页：Test3.php

＆＃13;

<?php
session_start();
?>
<!DOCTYPE html>
<html>

<head>
  <title>Test2</title>
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
</head>

<body>
  <form action="Result.php" method="POST">
    2. What is your age?<br> &ensp;&ensp;
    <input type="radio" name="age" value="14years">Under 14 years old<br> &ensp;&ensp;
    <input type="radio" name="age" value="15years">15-24 years old<br> &ensp;&ensp;
    <input type="radio" name="age" value="25years">25-59 years old<br> &ensp;&ensp;
    <input type="radio" name="age" value="60years">60-74 years old<br> &ensp;&ensp;
    <input type="radio" name="age" value="75years">Above 75 years old<br><br><br><br>
    <input type="submit" a href="Test3.php" name="submit" value="Submit">
  </form>
</body>

</html>
<?php
session_destroy();
?>

＆＃13;

这是收到三个php文件的最后一页＆＃39;值：Result.php：

＆＃13;

<?php
session_start();
?>
<!DOCTYPE html>
<html>

<head>
  <title>Test3</title>
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
</head>

<body>
  <form action="Result.php" method="POST">
    3. Please specify your ethnicity (race)<br> &ensp;&ensp;
    <input type="radio" name="race" value="chinese">Chinese<br> &ensp;&ensp;
    <input type="radio" name="race" value="malay">Malay<br> &ensp;&ensp;
    <input type="radio" name="race" value="indian">Indian<br> &ensp;&ensp;
    <input type="radio" name="race" value="others">Others<br><br>
    <input type="submit" name="submit" value="Submit">
  </form>
</body>

</html>
<?php
session_destroy();
?>

＆＃13;

结果是Result.php上的未定义索引。我在互联网上搜索并尝试不同的解决方案。之后，我认为我的每个表单中的按钮都有一些问题，但我找不到一些解决方案。所以对代码的一些解释对我来说将是一个很大的帮助。感谢。

Answer 1

<form action="Report.php" method="GET">
  Name: <input type=text name=username size=20><br><br>
</form>

// script
function GetParam(name, url) {
    if (!url) url = window.location.href;
    name = name.replace(/[\[\]]/g, "\\$&");
    var regex = new RegExp("[?&]" + name + "(=([^&#]*)|&|#|$)"),
        results = regex.exec(url);
    if (!results) return null;
    if (!results[2]) return '';
    return decodeURIComponent(results[2].replace(/\+/g, " "));
}

console.log(GetParam('username')); // will get the username query in the url

Answer 2

您的GetParam(username)正在接受参数，但在调用GetParam();时您没有参数。删除username表单GetParam(username)您不能传递用户名，因为您是从查询字符串中获取的。

function GetParam() {
    var start = location.search.indexOf("?" + username + "=");
    if (start < 0) start = location.search.indexOf("&" + username + "=");
    if (start < 0) return '';
    start += username.length + 2;
    var end = location.search.indexOf("&", start) - 1;
    if (end < 0) end = location.search.length;
    var result = '';
    for (var i = start; i <= end; i++) {
        var c = location.search.charAt(i);
        result = result + (c == '+' ? ' ' : c);
    }
    return unescape(result);
}
result = GetParam();
username = unescape(result["username"]);
document.write("Hi " + username + "<br>");

使用PHP，您可以使用$_GET[]

获取参数

<?php
if(isset($_GET["username"])){
 print("Hi ".$_GET["username"]);   
}
?>

Answer 3

在html

中初始化如下表单

<form method = "get" action="phpFileName.php">
    <input type="text" value="" name="name" placeholder="name"/>
    <input type="submit" value="submit" name="submit"/>
</form>

在你的php文件phpFileName.php脚本中如下

<?php

if(isset($_GET["submit"])){
 print("Welcome ".$_GET["name"]);   
}
?>

PHP中提交按钮的未定义索引

3 个答案: