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Ajax提交表单时验证码自动验证 php后端验证码检测

本文通过源码展示如何实现表单提交前,验证码先检测正确性,不正确则不提交表单,更新验证码。

1、前端代码 index.html

 <!DOCTYPE html>
<html>
<head>
 <title>验证码提交自验证</title>
 <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
 <meta http-equiv="Content-Language" content="zh-CN" />
</head>
<body>
 <form action="doPost.php" method="POST">
  
  <div class="row">
   <label for="username">用户名</label>
   <input type="text" name="username" id="username" />
  </div>
  <div class="row">
   <label for="mod-captcha-code">验证码</label>
   <input name="code" id="mod-captcha-code" size="6" class="zjcaptcha" style="width:80px" type="text"/>
   <img class="code-img" style="height:30px;width:80px;" src="http://www.mamicode.com/createcode.php?t=0" onclick="this.src=http://www.mamicode.com/this.src.substring(0,this.src.indexOf(‘?‘)+1)+Math.random();return false;" />
   <script type="text/javascript" src="http://www.zjmainstay.cn/jquery/jquery-1.8.2.min.js"></script>
   <div class="yzmtips" style="color:red"></div>
  </div>
  <div class="row">
   <input type="submit" value="http://www.mamicode.com/提交" class="submitBtn"/>
  </div>
 </form>
<script>
(function($){
 $(document).ready(function(){
  $(".submitBtn").click(function() {
   var obj = $(this);
   $.ajax({
    url:‘checkcode.php‘,
    type:‘POST‘,
    data:{code:$.trim($("input[name=code]").val())},
    dataType:‘json‘,
    async:false,
    success:function(result) {
     if(result.status == 1) {
      obj.parents(‘form‘).submit(); //验证码正确提交表单
     }else{
      $(".code-img").click();
      $(".yzmtips").html(‘验证码错误!‘);
      setTimeout(function(){
       $(".yzmtips").empty();
      },3000);
     }
    },
    error:function(msg){
     $(".yzmtips").html(‘Error:‘+msg.toSource());
    }
   })
   return false;
  })
 });
})(jQuery);
</script>
</body>
</html>

 2、后端验证码检测 checkcode.php

 <?php
/**
* 用户验证码验证文件
* @Author:Zjmainstay
* @version : 1.0
* @creatdate: 2013-10-4
*/
session_start();
echo json_encode(array(‘status‘=>(int)($_SESSION["CHECKCODE"] == $_POST[‘code‘])));
exit; 

Ajax提交表单时验证码自动验证 php后端验证码检测