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
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<!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?t=0" onclick = "this.src=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 = "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
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<?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 ; |
源码下载地址:Ajax实现提交表单时验证码自动验证
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。