未定义的索引:formSubmit

Undefined index: formSubmit

本文关键字：formSubmit 索引 未定义      更新时间：2023-09-26

我正在构建一个用于将数据输入数据库的表单。我已经建立了基本的形式和验证（我认为）。当我尝试在我的服务器/域上测试它时，我不断收到错误undefined Index:Form Submit。我确信这是小事，但我找不到我的错误。如果能多看一双眼睛，我将不胜感激。

<!DOCTYPE HTML>
<html lang = "en">
<head>
<link rel="stylesheet" type="text/css" href="mystylesheet.css">
<title>Tech Order Department.html</title>
<meta charset = "UTF-8" />
</head>
<body>
<!--Designing my form-->
<h2>New Projects</h2>
<br>
<?php
  if($_POST['formSubmit'] == "Submit") 
  {
    $varMovie = $_POST['formProject'];
$varMovie = $_POST['formClient'];
$varMovie = $_POST['formLastName'];
$varMovie = $_POST['formDateReceived'];
  }
?>

<form action="myform.php" method="post">
       Project:<br>
       <input type="text" name="Project">
<br>
       Client:<br>
       <input type="text" name="Client">
<br>
       Last Name:<br>
       <input type="text" name="LastName">
<br>
       Date Received:<br>
       <input type="text" name="DateReceived">

  <br><br>
    <input type="submit" name="formSubmit" value="Submit">
</form>   
<?php
if($_POST['formSubmit'] == "Submit") 
{
  $errorMessage = "";
  if(empty($_POST['formProject'])) 
  {
    $errorMessage .= "<li>You forgot to enter a project name!</li>";
  }
  if(empty($_POST['formClient'])) 
  {
    $errorMessage .= "<li>You forgot to enter a client name!</li>";
  }
  if(empty($_POST['formLastName'])) 
  {
    $errorMessage .= "<li>You forgot to enter the tech writer name!</li>";
  }
  if(empty($_POST['formDateReceived'])) 
  {
    $errorMessage .= "<li>You forgot to enter the date received!</li>";
  }

  $varMovie = $_POST['formProject'];
  $varName = $_POST['formClient'];
  $varMovie = $_POST['formLastName'];
  $varMovie = $_POST['formDateReceived'];
  if(!empty($errorMessage)) 
  {
    echo("<p>There was an error with your form:</p>'n");
    echo("<ul>" . $errorMessage . "</ul>'n");
  } 
}
?>

</body>
</html>

您应该更改：

  if($_POST['formSubmit'] == "Submit")

收件人：

  if(isset($_POST['formSubmit']) && $_POST['formSubmit'] == "Submit")

当您使用表单时，您应该始终至少在发布后验证您的字段是否已设置。

例如：

我们有一个快速表格：

<form action="action_page.php" method="POST">
  First name:<br>
  <input type="text" name="firstname" value="">
  <br>
  Last name:<br>
  <input type="text" name="lastname" value="">
  <br><br>
  <input type="submit" value="Submit">
</form>

首先要注意的是，我在上面放了两个属性：

  • 操作：表格将发送到哪个位置
  • 方法：表格将如何发送

有两个输入"firstname"、"lastname"和一个按钮submit。

假设您要在"action_page.php"上显示："Hello，firstname lastname"。

您可以只做以下操作：

<?php 
   echo 'Hello, '.$_POST['firstname'].' '.$_POST['lastname'];
?>

这会打印出你想要的东西。但在这些字段为空的情况下，将创建"未定义索引"。。。

因此，为了确保您不会使用不存在的变量，您应该执行以下操作：

<?php 
  //First we create an array that will errors if they occurs
  $error = array();
  //Then we test if firstname exist
  if(isset($_POST['firstname'])) {
     //if it does we can assign him.
     $firstname = $_POST['firstname'];
  }else{
     //if it doesn't that's an error.
     $error[] = 'Please enter your firstname';
  }
  //Then we test if lastname exist
  if (isset($_POST['lastname'])) {
     //if it does we can assign him.
     $lastname = $_POST['lastname'];
  }else{
     //if it doesn't that's an error.
     $error[] = 'Please enter your lastname';
  }
  //In the end we check if we have any error stocked:
  if(empty($error)) {
     //if it's empty we have all our required data to display our echo
   echo 'Hello, '.$firstname.' '.$lastname;
  }else{
     //else let's show the error
     print_r($error);
  }
?>

通过这种方式，我们可以在任何可能的"未定义索引"发生之前处理它们，我们确信我们的数据会返回一些东西，或者至少有一个相关的错误。

检查是否存在POST操作：-

if (!empty($_POST))

或

if ($_SERVER['REQUEST_METHOD'] == 'POST')

更新您的代码，检查此

<!DOCTYPE HTML>
<html lang = "en">
    <head>
        <link rel="stylesheet" type="text/css" href="mystylesheet.css">
        <title>Tech Order Department.html</title>
        <meta charset = "UTF-8" />
    </head>
    <body>
        <h2>New Projects</h2>
        <?php
        if ($_POST['formSubmit'] == "Submit") {
            $varMovie = $_POST['formProject'];
            $varMovie = $_POST['formClient'];
            $varMovie = $_POST['formLastName'];
            $varMovie = $_POST['formDateReceived'];
        }
        ?>
        <form action="myform.php" method="post">
            Project:<br>
            <input type="text" name="Project">
            <br>
            Client:<br>
            <input type="text" name="Client">
            <br>
            Last Name:<br>
            <input type="text" name="LastName">
            <br>
            Date Received:<br>
            <input type="text" name="DateReceived">
            <br><br>
            <input type="submit" name="formSubmit" value="Submit">
        </form>   
        <?php
        
       if(isset($_POST['formSubmit']) && $_POST['formSubmit'] == "Submit") {
            $errorMessage = "";
            if (empty($_POST['formProject'])) {
                $errorMessage .= "<li>You forgot to enter a project name!</li>";
            }
            if (empty($_POST['formClient'])) {
                $errorMessage .= "<li>You forgot to enter a client name!</li>";
            }
            if (empty($_POST['formLastName'])) {
                $errorMessage .= "<li>You forgot to enter the tech writer name!</li>";
            }
            if (empty($_POST['formDateReceived'])) {
                $errorMessage .= "<li>You forgot to enter the date received!</li>";
            }
            $varMovie = $_POST['formProject'];
            $varName = $_POST['formClient'];
            $varMovie = $_POST['formLastName'];
            $varMovie = $_POST['formDateReceived'];
            if (!empty($errorMessage)) {
                echo("<p>There was an error with your form:</p>'n");
                echo("<ul>" . $errorMessage . "</ul>'n");
            }
        }
        ?>
    </body>
</html>

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