为 WordPress 添加前台 AJAX 注册登录功能

功能前台化已成为 WordPress 主题制作的一大趋势，抛却缓慢臃肿的后台不说，前台便捷操作能给用户带来良好体验。登录与注册是网站的重要功能之一，这篇文章将讲述如何实现漂亮的 WordPress 前台登录注册功能，此外观移植自觉唯主题。

此功能的实现是由 AJAX 提交表格数据代替 PHP submit 提交至 WordPress 自带的 admin-ajax.php，再进行 WordPress 内部的 PHP 验证处理，基于功能简化要求，使用了 jquery 表单验证库，在输入界面就提醒用户的明显错误，如邮箱格式不正确等等。

jQuery 核心库 文件必须引入，请在文章底部下载 jQuery Validation Plugin 表单验证修改版。

首先使用 PHP 和 CSS 组织基本界面，点击登录或注册弹窗锚点，PHP 代码如下：

<div id="login-reg">
<span data-sign="0" id="user-login" class="user-login"><?php _e(' 登录','tinection'); ?></span>
<span data-sign="1" id="user-reg" class="user-reg"><?php _e('注册','tinection'); ?></span>
</div>

弹窗代码

<div id="sign" class="sign">
<div class="part loginPart">
<form id="login" action="<?php echo get_option('home'); ?>/wp-login.php" method="post" novalidate="novalidate">
<div id="register-active" class="switch"><i class="fa fa-toggle-on"></i>切换注册</div>
<h3>登录
<p class="status"></p>
</h3>
<label class="icon" for="username"><i class="fa fa-user"></i></label>
<input class="input-control" id="username" type="text" placeholder="请输入用户名" name="username" required="" aria-required="true">
<label class="icon" for="password"><i class="fa fa-lock"></i></label>
<input class="input-control" id="password" type="password" placeholder="请输入密码" name="password" required="" aria-required="true">
<p class="safe">
<label class="remembermetext" for="rememberme"><input name="rememberme" type="checkbox" checked="checked" id="rememberme" class="rememberme" value="forever">记住我的登录</label>
<a class="lost" href="<?php echo get_option('home'); ?>/wp-login.php?action=lostpassword"><?php _e('忘记密码 ?','tinection'); ?></a>
<input class="submit" type="submit" value="登录" name="submit"><a class="close"><i class="fa fa-times"></i></a>
<input type="hidden" id="security" name="security" value="<?php echo wp_create_nonce( 'security_nonce' );?>">
<input type="hidden" name="_wp_http_referer" value="<?php echo $_SERVER['REQUEST_URI']; ?>">
</form>
</div>
<div class="part registerPart">
<form id="register" action="<?php bloginfo('url'); ?>/wp-login.php?action=register" method="post" novalidate="novalidate">
<div id="login-active" class="switch"><i class="fa fa-toggle-off"></i>切换登录</div>
<h3>注册
<p class="status"></p>
</h3>
<label class="icon" for="user_name"><i class="fa fa-user"></i></label>
<input class="input-control" id="user_name" type="text" name="user_name" placeholder="输入英文用户名" required="" aria-required="true">
<label class="icon" for="user_email"><i class="fa fa-envelope"></i></label>
<input class="input-control" id="user_email" type="text" name="user_email" placeholder="输入常用邮箱" required="" aria-required="true">
<label class="icon" for="user_pass"><i class="fa fa-lock"></i></label>
<input class="input-control" id="user_pass" type="password" name="user_pass" placeholder="密码最小长度为6" required="" aria-required="true">
<label class="icon" for="user_pass2"><i class="fa fa-retweet"></i></label>
<input class="input-control" type="password" id="user_pass2" name="user_pass2" placeholder="再次输入密码" required="" aria-required="true">
<input class="submit" type="submit" value="注册" name="submit">
<a class="close"><i class="fa fa-times"></i></a> 
<input type="hidden" id="user_security" name="user_security" value="<?php echo wp_create_nonce( 'user_security_nonce' );?>">
<input type="hidden" name="_wp_http_referer" value="<?php echo $_SERVER['REQUEST_URI']; ?>"> 
</form>
</div>
</div>

此 PHP 代码请放到要显示登录按钮的地方，比如导航条。CSS 样式代码如下：

/* Login pop
/* ----------- */
.fadeIn #sign{opacity:1;-webkit-transform:translate3d(0,0,0);-moz-transform:translate3d(0,0,0);-o-transform:translate3d(0,0,0);transform:translate3d(0,0,0)}
#sign,#sign a{font-size:12px !important;line-height:1.5;}
#sign{position:fixed;z-index:9999;top:80px;left:50%;width:400px;margin-left:-200px;opacity:0;-webkit-transform:translate3d(0,-600px,0);-moz-transform:translate3d(0,-600px,0);-o-transform:translate3d(0,-600px,0);transform:translate3d(0,-600px,0);min-height:200px;-webkit-transition:all .3s ease-out;-moz-transition:all .3s ease-out;-o-transition:all .3s ease-out;transition:all .3s ease-out;-webkit-perspective:800px;-moz-perspective:800px;-ms-perspective:800px;perspective:800px}
#sign .part{position:absolute;width:100%;left:0;top:0;background-color:#FFF;padding:50px 50px 40px 50px;box-sizing:border-box;-webkit-transform-style:preserve-3d;-moz-transform-style:preserve-3d;-ms-transform-style:preserve-3d;transform-style:preserve-3d;-webkit-transition:all .9s ease-in-out;-moz-transition:all .9s ease-in-out;-ms-transition:all .9s ease-in-out;transition:all .9s ease-in-out;-webkit-backface-visibility:hidden;-moz-backface-visibility:hidden;-ms-backface-visibility:hidden;backface-visibility:hidden;display:none}
#sign.sign .part.loginPart{-webkit-transform:rotateY(0deg);-moz-transform:rotateY(0deg);-ms-transform:rotateY(0deg);transform:rotateY(0deg);z-index:1;display:block}
#sign.sign .part.registerPart{-webkit-transform:rotateY(-180deg);-moz-transform:rotateY(-180deg);-ms-transform:rotateY(-180deg);transform:rotateY(-180deg);z-index:0;display:block}
#sign.register .part.loginPart{-webkit-transform:rotateY(180deg);-moz-transform:rotateY(180deg);-ms-transform:rotateY(180deg);transform:rotateY(180deg);z-index:0;display:block}
#sign.register .part.registerPart{-webkit-transform:rotateY(0deg);-moz-transform:rotateY(0deg);-ms-transform:rotateY(0deg);transform:rotateY(0deg);z-index:1;display:block}
#sign form h3{font-size:18px;margin-bottom:20px}
#sign form h3 p{font-size:12px;color:#999;margin:0 0 0 10px;display:inline-block}
#sign form .status .error{color:#ea4c89}
#sign form .status .success{color:#00c3b6}
#sign form p{margin:10px auto;position:relative}
#sign form label.error{color:#FFF;background-color:#7656E8;padding:0 4px;position:absolute;z-index:5;right:10px;top:11px}
#sign form label.icon{position:absolute;right:10px;top:5px;color:#999;font-size:20px;color:rgba(0,0,0,.3)}
#sign form label.icon i{width:20px;text-align:center}
#sign form input{border:1px solid #ddd;padding:10px;width:100%;box-sizing:border-box}
#sign ::-webkit-input-placeholder{color:#999}
#sign form input:focus{border:1px solid #00c3b6}
#sign input:-moz-placeholder{color:#999}
#sign input.input-control{padding-right:35px}
#sign form .submit{cursor:pointer;background-color:#00c3b6;color:#FFF;border:0 none;font-size:14px}
#sign form .submit:hover{background-color:#00b5a9}
#sign form .submit:focus{border:0 none}
#sign form .safe{color:#999;margin-top:20px}
#sign form .rememberme{width:inherit;margin-right:3px}
#sign form .lost{float:right}
#sign form .close{position:absolute;right:25px;top:0;width:50px;height:50px;border-radius:0 0 50px 50px;text-align:center;line-height:50px;background-color:#444;font-size:16px;color:#FFF}
#sign form .close i{-webkit-transition:all ease-out .3s;-moz-transition:all ease-out .3s;-o-transition:all ease-out .3s;transition:all ease-out .3s}
#sign form .close:hover i{-webkit-transform:rotate(180deg);-moz-transform:rotate(180deg);-o-transform:rotate(180deg);transform:rotate(180deg)}
#sign .other-sign{border-top:1px solid rgba(0,0,0,.1);margin:30px -50px auto -50px;padding:0 50px}
#sign .other-sign p{margin:20px auto 10px auto}
#sign .other-sign a{display:inline-block;padding:6px 10px;border-radius: 3px;}
#sign .other-sign a i{margin-right:5px}
#sign .other-sign .qqlogin{background-color:#4a9cf8;color:#FFF;}
#sign .other-sign .weibologin {background-color: #e14d4c;color: #FFF;}
#sign .other-sign div{width:150px;text-align:center;float:left;}
#sign .switch{color:#999;cursor:pointer;margin:15px auto;display:inline-block}
#sign .switch i{margin-right:5px;color:#1cbdc5}
.overlay {background: #000;opacity: .8;position: fixed;width: 100%;height: 100%;left: 0;top: 0;z-index: 9998;}
.nav-wrap #login-reg{float: right;margin-left: 5px;font-size: 12px;padding: 14px 0;height: 60px;}
.nav-wrap #login-reg span{display: block;background-color: #757575;background-color: rgba(255,255,255,.2);color: rgba(255,255,255,.8);height: 32px;padding: 0 15px;line-height: 32px;overflow: hidden;display:inline-block;cursor:pointer;float:left;}
#user-login{border-radius: 4px 0 0 4px;}
#user-reg{border-radius: 0 4px 4px 0;margin-left:1px}

CSS 样式可直接放到 style.css 文件中。

功能实现

ajax 提交表单数据代码已经包含在修改版 jQuery Validation Plugin 表单验证 js 文件中，主要是将 ajax 的提交 action 指向 admin-ajax.php 这个 wordpress 自带 ajax 处理接口，请直接下载即可。

表单后台处理，先在 functions.php 文件中添加如下几个函数，代码如下：

/* 获取当前页面url
/* ---------------- */
function tin_get_current_page_url(){
$ssl = (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] == 'on') ? true:false;
$sp = strtolower($_SERVER['SERVER_PROTOCOL']);
$protocol = substr($sp, 0, strpos($sp, '/')) . (($ssl) ? 's' : '');
$port = $_SERVER['SERVER_PORT'];
$port = ((!$ssl && $port=='80') || ($ssl && $port=='443')) ? '' : ':'.$port;
$host = isset($_SERVER['HTTP_X_FORWARDED_HOST']) ? $_SERVER['HTTP_X_FORWARDED_HOST'] : isset($_SERVER['HTTP_HOST']) ? $_SERVER['HTTP_HOST'] : $_SERVER['SERVER_NAME'];
return $protocol . '://' . $host . $port . $_SERVER['REQUEST_URI'];
}

/* AJAX登录变量
/* -------------- */
function ajax_sign_object(){
$object = array();
$object[redirecturl] = tin_get_current_page_url();
$object[ajaxurl] = admin_url( '/admin-ajax.php' );
$object[loadingmessage] = '正在请求中，请稍等...';
$object_json = json_encode($object);
return $object_json;
}

/* AJAX登录验证
/* ------------- */
function tin_ajax_login(){
$result = array();
if(isset($_POST['security']) && wp_verify_nonce( $_POST['security'], 'security_nonce' ) ){
$creds = array();
$creds['user_login'] = $_POST['username'];
$creds['user_password'] = $_POST['password'];
$creds['remember'] = ( isset( $_POST['remember'] ) ) ? $_POST['remember'] : false;
$login = wp_signon($creds, false);
if ( ! is_wp_error( $login ) ){
$result['loggedin'] = 1;
}else{
$result['message'] = ( $login->errors ) ? strip_tags( $login->get_error_message() ) : 'ERROR: ' . esc_HTML__( '请输入正确用户名和密码以登录', 'tinection' );
}
}else{
$result['message'] = __('安全认证失败，请重试！','tinection');
}
header( 'content-type: application/json; charset=utf-8' );
echo json_encode( $result );
exit;

}
add_action( 'wp_ajax_ajaxlogin', 'tin_ajax_login' );
add_action( 'wp_ajax_nopriv_ajaxlogin', 'tin_ajax_login' );

/* AJAX注册验证
/* ------------- */
function tin_ajax_register(){
$result = array();
if(isset($_POST['security']) && wp_verify_nonce( $_POST['security'], 'user_security_nonce' ) ){
$user_login = sanitize_user($_POST['username']);
$user_pass = $_POST['password'];
$user_email = apply_filters( 'user_registration_email', $_POST['email'] );
$errors = new WP_Error();
if( ! validate_username( $user_login ) ){
$errors->add( 'invalid_username', __( '请输入一个有效用户名','tinection' ) );
}elseif(username_exists( $user_login )){
$errors->add( 'username_exists', __( '此用户名已被注册','tinection' ) );
}elseif(email_exists( $user_email )){
$errors->add( 'email_exists', __( '此邮箱已被注册','tinection' ) );
}
do_action( 'register_post', $user_login, $user_email, $errors );
$errors = apply_filters( 'registration_errors', $errors, $user_login, $user_email );
if ( $errors->get_error_code() ){
$result['success'] = 0;
$result['message'] = $errors->get_error_message();

} else {
$user_id = wp_create_user( $user_login, $user_pass, $user_email );
if ( ! $user_id ) {
$errors->add( 'registerfail', sprintf( __( '无法注册，请联系管理员','tinection' ), get_option( 'admin_email' ) ) );
$result['success'] = 0;
$result['message'] = $errors->get_error_message(); 
} else{
update_user_option( $user_id, 'default_password_nag', true, true ); //Set up the Password change nag.
wp_new_user_notification( $user_id, $user_pass ); 
$result['success'] = 1;
$result['message'] = esc_html__( '注册成功','tinection' );
//自动登录
wp_set_current_user($user_id);
wp_set_auth_cookie($user_id);
$result['loggedin'] = 1;
}

} 
}else{
$result['message'] = __('安全认证失败，请重试！','tinection');
}
header( 'content-type: application/json; charset=utf-8' );
echo json_encode( $result );
exit; 
}
add_action( 'wp_ajax_ajaxregister', 'tin_ajax_register' );
add_action( 'wp_ajax_nopriv_ajaxregister', 'tin_ajax_register' );

js 必须的变量引入，请在主题的 header.php 或 footer.php 中引入如下代码：

<script type="text/javascript">
/* <![CDATA[ */
var ajax_sign_object = <?php echo ajax_sign_object(); ?>;
/* ]]> */
</script>