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Question

我正在尝试使用ajax将表单提交到数据库。我成功地使用AJAX发布到数据库。但问题不在于我不确定如何检查提交的值是否已存在于数据库中。

我已经有了这样做的PHP，但我正在尝试使用AJAX。我正在使用 jquery validate plugin 以下是代码。

$('#subscribeForm').validate({
  errorElement: "p",
  errorPlacement: function(error, element) {
  $('.status').html(error);
},

rules: {
  email: {
    required: true,
    email: true,
    remote: {
        url: 'index.php',
        type: 'post',
        data: {
            email: function(){
            // not sure how to check this
        }
    }
}
}
},

messages: {
email: {
required: "Please enter your email.",
email: "Please enter a valid email.",
// remote: jQuery.format("{0} is already in use")  // doesnt work
}
},

submitHandler: function(form) {
var btn = $(".submit_button");
btn.attr("value", "Submitting..");

$(form).ajaxSubmit({
    success: function(){
        btn.attr("value", "Submitted");
    }
});
return false;
}
});

这是我的PHP：

if(isset($_REQUEST['subscribeForm'])){
$email = trim($_POST['email']);

if(empty($email) || !valid_email($email)){
    $status = 'Please provide valid email address.';
} else {
    if(email_exist($email)){
        $status = 'You are already subscribed.';
    } else {
        add_email($email);
        $status = 'Thank you for subscribing.';
    }
   }
 }

修改

这是我尝试过但又失败了。

if(isset($_REQUEST['subscribeForm'])){
$email = trim($_POST['email']);

if(empty($email) || !valid_email($email)){
    $status = 'Please provide valid email address.';
} else {
    if(email_exist($email)){
        $status = 'You are already subscribed.';
        echo false;
    } else {
        add_email($email);
        $status = 'Thank you for subscribing.';
        echo true;
    }
}
}

我的Javascript

rules: {
email: {
required: true,
email: true,
remote: {
  url: 'index.php',
  type: 'post'
   }
}
},

messages: {
 email: {
required: "Please enter your email.",
email: "Please enter a valid email.",
remote: "You are already subscribed."
   }
 },

Answer 1

只需回显PHP文件中的错误代码，然后使用Javascript中的AJAX解析错误代码并确定电子邮件是否已注册。

<强> PHP ：

define('ERROR_SUCCESS', 0);
define('ERROR_ALREADY', 1);
define('ERROR_INVALID', 2);

if (isset($_REQUEST['subscribeForm'])) {
    $email = trim($_POST['email']);

    if (empty($email) || !valid_email($email)) {
        $status = 'Please provide valid email address.';
        echo ERROR_INVALID;
    } else {
        if (email_exist($email)) {
            $status = 'You are already subscribed.';
            echo ERROR_ALREADY;
        } else {
            add_email($email);
            $status = 'Thank you for subscribing.';
            echo ERROR_SUCCESS;
        }
    }
}

Answer 2

你应该在JS中做一些事情，在返回“谢谢订阅”回声时做成功。

尝试;

<强>的Javascript

messages: {
email: {
required: "Please enter your email.",
email: "Please enter a valid email.",
success: "Thank you for subscribing.",
// remote: jQuery.format("{0} is already in use")  // doesnt work
}
},

<强> PHP

if(isset($_REQUEST['subscribeForm'])){
$email = trim($_POST['email']);

if(empty($email) || !valid_email($email)){
    $status = 'false';
} else {
    if(email_exist($email)){
        $status = 'false';
    } else {
        add_email($email);
        $status = 'true';
    }
   }
 }
echo $status;

使用jquery validate plugin检查数据库中是否存在电子邮件

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2 个答案: