Automatic verification of verification code when Ajax submits form PHP backend verification code detection

Automatic verification of verification code when Ajax submits form PHP backend verification code detection_php example

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Release： 2016-08-04 08:56:42

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This article shows through the source code how to implement the verification code to check the correctness before submitting the form. If it is incorrect, the form will not be submitted and the verification code will be updated.

1. Front-end code 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="createcode.php&#63;t=0" onclick="this.src=this.src.substring(0,this.src.indexOf('&#63;')+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="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>

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2. Backend verification code detection checkcode.php

 <&#63;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;

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Source code download address: Ajax realizes automatic verification of verification code when submitting a form

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