我正在构建一个用于将数据输入数据库的表单。我已经构建了基本的表单和验证(我认为)。当我尝试在我的服务器/域上测试它时，我不断收到错误未定义索引:表单提交。我确信这是一件小事，但我找不到我的错误。如果有更多人关注这一点，我们将不胜感激。
<!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>" . $errorMessage . "</ul>\n");
}
}
?>
</body>
</html>
最佳答案
你应该改变:
if($_POST['formSubmit'] == "Submit")
致:
if(isset($_POST['formSubmit']) && $_POST['formSubmit'] == "Submit")
当您使用表单时，您应该始终至少在发布后验证您的字段是否已设置。
例如:
我们有这个快速表格:
<form action="action_page.php" method="POST">
First name:<br>
<input type="text" name="firstname" value="">
<br>
Last name:<br>
<input type="text" name="lastname" value="">
<br><br>
<input type="submit" value="Submit">
</form>
首先请注意，我添加了两个属性:
- action:表单将发送到的位置
- 方法:表单的发送方式
有两个输入“firstname”、“lastname”和一个提交按钮。
假设您要在“action_page.php”上显示:“您好，名字姓氏”。
您可以执行以下操作:
<?php
echo 'Hello, '.$_POST['firstname'].' '.$_POST['lastname'];
?>
这将打印出你想要的内容。 但如果这些字段为空，则会创建“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”发生之前对其进行处理，并且我们确信我们的数据将返回某些内容或至少有一个相关的错误。
关于javascript - 未定义索引 : formSubmit，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/33567519/