PHP表单验证，无需重置所有其他值

Samuel 发表于 Dev

塞缪尔

我有一个包含3个字段的表单，我想验证这些字段。

假设用户输入错误或未输入电子邮件，则所有其他字段（名称和地址）均重置为空白。

有什么方法可以显示错误消息（需要电子邮件），而无需重新设置名称和地址，从而使用户不必再次输入所有值？

这对于表单具有多个值的用户很有帮助。

太感谢了

请在下面查看我的PHP代码：

<!DOCTYPE HTML>
<html>
<head>
<style>
.error {color: #FF0000;}
</style>
</head>
<body>

<?php
// define variables and set to empty values
$nameErr = $emailErr = $addressErr = "";
$name = $email = $address = "";

if ($_SERVER["REQUEST_METHOD"] == "POST") {

if (empty($_POST["address"])) {
 $AddressErr = "Address is required";
} else {
 $address = test_input($_POST["address"]);
// check if name only contains letters and whitespace
if (!preg_match("/^[a-zA-Z ]*$/",$address)) {
  $addressErr = "Only letters and white space allowed";
}
}


if (empty($_POST["name"])) {
 $nameErr = "Name is required";
} else {
 $name = test_input($_POST["name"]);
// check if name only contains letters and whitespace
if (!preg_match("/^[a-zA-Z ]*$/",$name)) {
  $nameErr = "Only letters and white space allowed";
}
}

if (empty($_POST["email"])) {
  $emailErr = "Email is required";
} else {
   $email = test_input($_POST["email"]);
 // check if e-mail address is well-formed
 if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
   $emailErr = "Invalid email format";
 }
 }


 <p><span class="error">* required field.</span></p>
 <form method="post" action="<?php echo  htmlspecialchars($_SERVER["PHP_SELF"]);?>">


<input type="text" name="name" placeholder="First Name">
<span class="error">* <?php echo $nameErr;?></span>
<br><br>

<input type="text" name="email" placeholder="Email">
<span class="error">* <?php echo $emailErr;?></span>
<br><br>


<input type="text" name="address" placeholder="Address">
<span class="error">* <?php echo $AddressErr;?></span>
<br><br>


<input type="submit" name="submit" value="SAVE">
</form>


<?php

if ($nameErr == '' && $emailErr == '' && $AddressErr == '') 
{

   $db = pg_connect('host=localhost dbname=test user=samuelraul password=naikaerikamber');

    $firstname = pg_escape_string($_POST['name']);
    $emailaddress = pg_escape_string($_POST['email']);
    $address = pg_escape_string($_POST['address']);

 $query = "INSERT INTO host(firstname, emailaddress, address) VALUES('" .     $firstname . "', ' '" . $emailaddress . "',  '" . $address . "')";

    $result = pg_query($db, $query);
    if (!$result) {
        $errormessage = pg_last_error();
        echo "Error with query: " . $errormessage;
        exit();
    }
    pg_close();

 }
?>

</body>
</html>

乌塔姆·库玛·罗伊（Uttam Kumar Roy）

您可以使用value="<?php echo $name;?>"name字段，因为您已经定义了$name变量。可以将$email和$address变量分别用于email和address字段。

<form method="post" action="<?php echo  htmlspecialchars($_SERVER["PHP_SELF"]);?>">
    <input type="text" name="name" placeholder="First Name" value="<?php echo $name;?>">
    <span class="error">* <?php echo $nameErr;?></span>
    <br><br>
    <input type="text" name="email" placeholder="Email" value="<?php echo $email;?>">
    <span class="error">* <?php echo $emailErr;?></span>
    <br><br>
    <input type="text" name="address" placeholder="Address" value="<?php echo $address;?>">
    <span class="error">* <?php echo $AddressErr;?></span>
    <br><br>
    <input type="submit" name="submit" value="SAVE">
</form>

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