php jquery 验证码 输入后验证表单
php jquery 验证码 输入后验证表单可以刷新验证码，提交验证是否输入正确
演示
PHP Code
[*]<?php
[*]session_start();
[*]$cap = 'notEq';
[*]if ($_SERVER['REQUEST_METHOD'] == 'POST') {
[*] if ($_POST['captcha'] == $_SESSION['cap_code']) {
[*] // Captcha verification is Correct. Do something here!
[*] $cap = 'Eq';
[*] } else {
[*] // Captcha verification is wrong. Take other action
[*] $cap = '';
[*] }
[*]}
[*]?>
[*]<form action="index.php" method="post">
[*] <div id="form">
[*] <table border="0" width="100%">
[*] <tr>
[*] <td colspan="2"><label>Name:</label><label class="mandat"> *</label><br/>
[*] <input type="text" name="name" id="name"/></td>
[*] </tr>
[*] <tr>
[*] <td colspan="2"><label>Message:</label><label class="mandat"> *</label><br/>
[*] <textarea name="msg" id="msg"></textarea></td>
[*] </tr>
[*] <tr>
[*] <td colspan="2"><label>Enter the contents of image</label><label class="mandat"> *</label></td>
[*] </tr>
[*] <tr>
[*] <td width="60px">
[*] <input type="text" name="captcha" id="captcha" maxlength="6" size="6"/></td>
[*] <td><img id="captcha-image-new" name="captcha-image-new" src="captcha.php"/>
[*]
[*] </td>
[*] </tr>
[*] <tr>
[*] <td><input type="submit" value="Submit" id="submit"/></td>
[*] <td><a href="#" onClick="javascript:refresh();" id="change-image">看不清,换一个</a> </td>
[*] </tr>
[*] </table>
[*] </div>
[*] </form>
[*] <div class="cap_status"></div>
[*] </div>
js文件
JavaScript Code
[*] <script type="text/javascript">
[*] $(document).ready(function(){
[*] $('#submit').click(function(){
[*] var name = $('#name').val();
[*] var msg = $('#msg').val();
[*] var captcha = $('#captcha').val();
[*]
[*] if( name.length == 0){
[*] $('#name').addClass('error');
[*] }
[*] else{
[*] $('#name').removeClass('error');
[*] }
[*]
[*] if( msg.length == 0){
[*] $('#msg').addClass('error');
[*] }
[*] else{
[*] $('#msg').removeClass('error');
[*] }
[*]
[*] if( captcha.length == 0){
[*] $('#captcha').addClass('error');
[*] }
[*] else{
[*] $('#captcha').removeClass('error');
[*] }
[*]
[*] if(name.length != 0 && msg.length != 0 && captcha.length != 0){
[*] return true;
[*] }
[*] return false;
[*] });
[*]
[*] var capch = '<?php echo $cap; ?>';
[*] if(capch != 'notEq'){
[*] if(capch == 'Eq'){
[*] $('.cap_status').html("Your form is successfully Submitted ").fadeIn('slow').delay(3000).fadeOut('slow');
[*] }else{
[*] $('.cap_status').html("Human verification Wrong!").addClass('cap_status_error').fadeIn('slow');
[*] }
[*] }
[*]
[*]
[*]
[*] });
[*]
[*]function refresh()
[*]{
[*] document.getElementById('captcha-image-new').src='captcha.php?'+Math.random();
[*] document.getElementById('captcha').focus();
[*]}
[*] </script>
[*]
captcha.php
PHP Code
[*]<?php
[*]session_start();
[*]$ranStr = md5(microtime());
[*]$ranStr = substr($ranStr, 0, 6);
[*]$_SESSION['cap_code'] = $ranStr;
[*]$newImage = imagecreatefromjpeg("cap_bg.jpg");
[*]$txtColor = imagecolorallocate($newImage, 0, 0, 0);
[*]imagestring($newImage, 5, 5, 5, $ranStr, $txtColor);
[*]header("Content-type: image/jpeg");
[*]imagejpeg($newImage);
[*]?>
原文地址:http://www.freejs.net/article_biaodan_65.html
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