demo_form_validation_required 在线代码实例

实例代码( Tip: 登录后体验更佳 )

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<!DOCTYPE HTML> 
<html>
<head>
<meta charset="utf-8">
<title>W3Cschool在线教程(w3cschool.cn)</title>
<script src="https://cdn.bootcss.com/jquery/2.0.2/jquery.js"></script>
<style>
.error {color: #FF0000;}
</style>
</head>
<body>
<?php
// 定义变量并默认设为空值
$nameErr = $emailErr = $genderErr = $websiteErr = "";
$name = $email = $gender = $comment = $website = "";
if ($_SERVER["REQUEST_METHOD"] == "POST") {
   if (empty($_POST["name"])) {
      $nameErr = "名字是必须的。";
   } else {
      $name = test_input($_POST["name"]);
   }
 
   if (empty($_POST["email"])) {
      $emailErr = "邮箱是必须的。";
   } else {
      $email = test_input($_POST["email"]);
   }
   if (empty($_POST["website"])) {
      $website = "";
   } else {
      $website = test_input($_POST["website"]);
 
 
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运行结果
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