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页面防重复提交方法总结

Jun 21, 2016 am 08:48 AM
nbsp session token

有时候我们的程序执行比较慢,而且我们页面也不怎么友好,没什么提示信息。操作人员以为没有点击提交按钮,就会再一次点击提交。这会导致很多问题出现。下面介绍三种防重复提交的方法。

 

1、提交按钮置disabled

 

      当用户提交后,立即把按钮置为不可用状态。这种用js来实现。

 

         提交前

 

        $("#submit").attr('disabled','true');

         $("#submit").val("正在提交,请稍等");

 

 

 

       ....................................................................................

 

    执行后,把按钮置为原来状态

 

    

 

      $('#submit ').removeAttr('disabled');

      $("#submit ").val("确定提交");

 

 

 

2、过期时间法

 

    思路:当用户提交按钮后生成一个token(每次业务提交token 为唯一值)存入session,并设置过期时间。当用户再此提交时,检测token是否一致且是否过期,若一致且没有过期,则认为提交了二次。当程序执行出错的时候,则需要清除存入session的值。见下面程序

 

 

 

function checkRepeatSubmit($uniqueid = '', $expire = 30) {

 

        $uniqueid = empty($uniqueid) ? Yii::app()->user->id . Yii::app()->user->name . Yii::app()->user->mihome : $uniqueid;

        $token = md5("wms_check_repeat" . $uniqueid);

 

        $time = time();

 

        if (isset($_SESSION['token']) && !empty($_SESSION['token']) && $_SESSION['token'] == $token && ($time - $_SESSION['expire_time']

 

            return false;

        } else {

 

            $_SESSION['token'] = $token;

            $_SESSION['expire_time'] = $time;

            //session写入的时候会等待整个页面加载完成,用此函数可以立即写入

            session_write_close();

            return true;

        }

    }

 

 //删除存入的值

 

   function cancelRepeatSubmit() {

 

        unset($_SESSION['token']);

        unset($_SESSION['expire_time']);

    }

 

 

 

3、token销毁法

 

思路:当页面进行加装的时候生成token,存在session中,并写在表单里。表单提交的时候随表单提交给服务端,服务端通过session存入的token与token进行比较,若相等,则销毁seesion中存入的token,当页面遭到二次提交的时候,由于存入session中的token不存在而报错。下面是代码

 

 /**

     * 第二种方案

     * 1、产生token,并存在session中

     * 2、随页面生成

     * 3、提交页面与session进行比对,成功后对session进行销毁

     * 4、第二次提交则不存在这个值而报错

     * @param type $uniqueid

     * @return type

     */

    function createToken($uniqueid) {

 

        $uniqueid = empty($uniqueid) ? Yii::app()->user->id . Yii::app()->user->name . Yii::app()->user->mihome : $uniqueid;

        $token = md5("wms_check2_repeat" . $uniqueid);

        $_SESSION['form_token'] = $token;

 

       ​session_write_close();

        return $token;

    }

 

    function checkToken($token) {

 

        if (!isset($_SESSION['form_token']) empty($_SESSION['form_token']) $_SESSION['form_token'] != $token) {

            return false;

        } else {

            unset($_SESSION['form_token']);

            return true;

        }

    }

 

 

 

上面总结了三种方法,个人感觉第一种跟第二种方法配合着用会达到更好的效果。第二种方法与第三种方法个人感觉第三种要有优势点。

 

第二种与第三种方法都是把token写在session中,这种方法好处是节省存储空间,但坏处是由于session是需要整个页面加载完毕才能写入,故当整个页面加载比较慢,且用户点击多次提交,可能由于session还没写入导致系统还认为是第一次输入。导致验证不起作用。好在php函数提供了一个牛逼的函数。   session_write_close(),可以立即把session写入,不用等待页面加载完成。同事对于session的存入也有很多种方法可以选择,可以存在redis,memcache或者数据库都可以的。

 



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