Question

我的输入和选择字段验证有问题。如果输入为空并单击提交警告“此字段是必需的”。

但是当我填写ClientID输入并且选择框为空时，验证将失败。或者反转，当选择了选择框并且输入为空时。

这里是我的代码：

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

<?php

$nameErr = $katalogErr = $selectKatalog = "";
$kdn = "";

if ($_SERVER["REQUEST_METHOD"] == "POST") {
  if (empty($_POST["kdn"])) {
    $nameErr = "This field is required";
  } else {
    $kdn = test_input($_POST["kdn"]);
    // check if kdn only contains letters, numbers and whitespace
    if (!preg_match("/^[a-zA-Z0-9 ]*$/", $kdn)) {
      $nameErr = "Only letters, numbers and white space allowed"; 
    }
  }

  if($_POST["selectKatalog"] == 'default'){
      $katalogErr = "This field is required";
  }
  else {
    $selectKatalog = $_POST["selectKatalog"];
  }
}

function test_input($data) {
    $data = trim($data);
    $data = stripslashes($data);
    $data = htmlspecialchars($data);
    return $data;
}
?>

<h2>Order a Catalog</h2>
<p><span class="error">* required field.</span></p>
<form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>">  
  ClientID: <input type="text" name="kdn">
  <span class="error">* <?php echo $nameErr;?></span>
  <br><br>
  Catalog: <select name="selectKatalog">
              <option value="default">Bitte wählen:</option>
              <option value="Catalog1">Catalog1</option>
              <option value="Catalog2">Catalog2</option>
              <option value="Catalog3">Catalog3</option>
           </select>
  <span class="error">* <?php echo $katalogErr;?></span>
  <br><br>
  <input type="submit" name="submit" value="Submit">  
</form>

<?php
echo "<h2>Your Input:</h2>";
echo $kdn;
echo "<br>";
echo $selectKatalog;
?>

</body>
</html>

使用php进行简单的服务器端验证

0 个答案: