手機網站提交頁面,網路好的時候正常,網路慢的時候手機頁面會一直在載入狀態,但是Fiddler抓取卻有兩次相同內容的提交,如何避免這種情況發生?
手機網站提交頁面,網路好的時候正常,網路慢的時候手機頁面會一直在載入狀態,但是Fiddler抓取卻有兩次相同內容的提交,如何避免這種情況發生?
我的做法是在服務端產生一個token,提交的時候驗證token,這是第一道驗證,第二道驗證為在表單提交時
將提交按鈕設為disabled,一般做個第二種驗證就可以了
<code>// 提交表单数据到后台处理 $.ajax({ type: "post", data: studentInfo, contentType: "application/json", url: "/Home/Submit", beforeSend: function () { // 禁用按钮防止重复提交 $("#submit").attr({ disabled: "disabled" }); }, success: function (data) { if (data == "Success") { //清空输入框 clearBox(); } }, complete: function () { $("#submit").removeAttr("disabled"); }, error: function (data) { console.info("error: " + data.responseText); } });</code>
Csrf 驗證類別
<code><?php // +---------------------------------------------------------------------- // | CSRF安全验证类 @pushaowei // +---------------------------------------------------------------------- // | [Usage] // | // 后端 // | use library\Base\NoCSRF; // | session_start(); // | if ($this->getRequest()->isPost()) { // | // | try { // | ##验证TOKEN // | NoCSRF::check( 'csrf_token', $_POST, true, 60*10, false ); //60*10为10分钟(null为不验证时间) // | $result = 'CSRF check passed. Form parsed.'; // | //$this->getRequest()->getPost('field'); // | echo $result; // | } catch ( Exception $e ) { // | echo $e->getMessage() . ' Form ignored.'; // | } // | } else { // | #生成TOKEN // | $token = NoCSRF::generate( 'csrf_token' ); // | $this->getView()->assign('token', $token); // | $this->getView()->display('页面'); // | } // | // 前端 // | <input type="hidden" name="csrf_token" value="{$token}"> // +---------------------------------------------------------------------- class NoCSRF { protected static $doOriginCheck = false; /** * Check CSRF tokens match between session and $origin. * Make sure you generated a token in the form before checking it. * * @param String $key The session and $origin key where to find the token. * @param Mixed $origin The object/associative array to retreive the token data from (usually $_POST). * @param Boolean $throwException (Facultative) TRUE to throw exception on check fail, FALSE or default to return false. * @param Integer $timespan (Facultative) Makes the token expire after $timespan seconds. (null = never) * @param Boolean $multiple (Facultative) Makes the token reusable and not one-time. (Useful for ajax-heavy requests). * * @return Boolean Returns FALSE if a CSRF attack is detected, TRUE otherwise. */ public static function check( $key, $origin, $throwException=false, $timespan=null, $multiple=false ) { $session = Session::getInstance(); if ( !$session->has( 'csrf_' . $key ) ) if($throwException) throw new \Exception( 'Missing CSRF session token.' ); else return false; if ( !isset( $origin[ $key ] ) ) if($throwException) throw new \Exception( 'Missing CSRF form token.' ); else return false; // Get valid token from session $hash = $session->get('csrf_' . $key); // Free up session token for one-time CSRF token usage. if(!$multiple) $session->forget('csrf_' . $key); // Origin checks if( self::$doOriginCheck && sha1( $_SERVER['REMOTE_ADDR'] . $_SERVER['HTTP_USER_AGENT'] ) != substr( base64_decode( $hash ), 10, 40 ) ) { if($throwException) throw new \Exception( 'Form origin does not match token origin.' ); else return false; } // Check if session token matches form token if ( $origin[ $key ] != $hash ) if($throwException) throw new \Exception( 'Invalid CSRF token.' ); else return false; // Check for token expiration if ( $timespan != null && is_int( $timespan ) && intval( substr( base64_decode( $hash ), 0, 10 ) ) + $timespan < time() ) if($throwException) throw new \Exception( 'CSRF token has expired.' ); else return false; return true; } /** * Adds extra useragent and remote_addr checks to CSRF protections. */ public static function enableOriginCheck() { self::$doOriginCheck = true; } /** * CSRF token generation method. After generating the token, put it inside a hidden form field named $key. * * @param String $key The session key where the token will be stored. (Will also be the name of the hidden field name) * @return String The generated, base64 encoded token. */ public static function generate( $key ) { $session = Session::getInstance(); $extra = self::$doOriginCheck ? sha1( $_SERVER['REMOTE_ADDR'] . $_SERVER['HTTP_USER_AGENT'] ) : ''; // token generation (basically base64_encode any random complex string, time() is used for token expiration) $token = base64_encode( time() . $extra . self::randomString( 32 ) ); // store the one-time token in session $session->put('csrf_' . $key, $token); return $token; } /** * Generates a random string of given $length. * * @param Integer $length The string length. * @return String The randomly generated string. */ protected static function randomString( $length ) { $seed = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijqlmnopqrtsuvwxyz0123456789'; $max = strlen( $seed ) - 1; $string = ''; for ( $i = 0; $i < $length; ++$i ) $string .= $seed{intval( mt_rand( 0.0, $max ) )}; return $string; } } ?></code>
肯定是點擊一次,提交一次,不可能因為網路慢就出現你點一次提交兩次的情況——事件的觸發,怎麼可能像無根之水一樣的?如果真有這種情況,那一定就是你程式碼的問題了
額,沒必要那麼複雜吧。
你看下兩個請求header
,是不是第一個請求down掉了,排除下是不是兩次點擊
導致的(如果是點擊導致的,點擊之後禁用dom元素的點擊事件),或者是代碼部分原因
導致的。
順帶發下你請求的程式碼
和Fiddler
捕獲的資料。
提交兩次的原因大致有兩種:
一,點擊事件觸發兩次(這種情況不分網速快慢)
這種多是由於一些js插件造成的,需要google一下來處理,比較常見的是iscroll.js
會造成事件執行兩次,網上有很多方案.
二,是網速忙,用戶等不及,多次點擊
一定要在將要ajax
前把按鈕disabled
掉,如果ajax
前把按鈕disabled
掉,如果表單是可以多次提交的,在