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php 防止表单重复提交

Jun 23, 2016 pm 01:29 PM

用户提交表单时可能因为网速的原因,或者网页被恶意刷新,致使同一条记录重复插入到数据库中,这是一个比较棘手的问题。我们可以从客户端和服务器端一起着手,设法避免同一表单的重复提交。

1.使用客户端脚本

[php]  view plain copy

 

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当用户单击“提交”按钮后,该按钮将变为灰色不可用状态
上面的例子中使用OnClick事件检测用户的提交状态,如果单击了“提交”按钮,该按钮立即置为失效状态,用户不能单击按钮再次提交。

还有一个方法,也是利用JavaScript的功能,但是使用的是OnSubmit()方法,如果已经提交过一次表单,将立即弹出对话框,代码如下:

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  1. <script> </script>
  2. var submitcount=0;  
  3. function submitOnce (form){  
  4.     if (submitcount == 0){  
  5.          submitcount++;  
  6.          return true;  
  7.     } else{  
  8.         alert("正在操作,请不要重复提交,谢谢!");  
  9.         return false;  
  10.     }  
  11. }  
  12.   
  13.   
  14.   
  15.   
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在上例中,如果用户已经单击“提交”按钮,该脚本会自动记录当前的状态,并将submitcount变量自加1,当用户试图再次提交时,脚本判断submitcount变量值非零,提示用户已经提交,从而避免重复提交表单。


2. 使用session(这个与JSP处理方法是一样的)

利用PHP的Session功能,也能避免重复提交表单。Session保存在服务器端,在PHP运行过程中可以改变Session变量,下次访问这个变量时,得到的是新赋的值,所以,可以用一个Session变量记录表单提交的值,如果不匹配,则认为是用户在重复提交。
A页面的代码:

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  1. session_start();                //根据当前SESSION生成随机数  
  2. $code = mt_rand(0,1000000);  
  3. $_SESSION['code'] = $code;      //将此随机数暂存入到session  
  4. ?>  
  5.   
  6.     

    说明   

  7.         ">  
  8.     

      
  9.   



B页面:

[php]  view plain copy

 

    1. session_start();  
    2. if(isset($_POST['originator'])) {  
    3.     if($_POST['originator'] == $_SESSION['code']){  
    4.         echo "ok";  
    5.         unset($_SESSION["code"]);               //将其清除掉此时再按F5则无效  
    6.     }else{  
    7.         echo "请不要刷新本页面或重复提交表单";  
    8.     }  
    9. }?>  

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