我使用常规contact_me表单的默认代码。它根据服务器响应（根据我的理解）带来成功或失败。此代码调用msend_form.php，它负责与数据库的通信。它始终返回true。我能够在那里检查数据库中的预先存在的电子邮件。问题是如何将其传递给ajax代码，以便它不仅会显示服务器响应错误，还会显示现有电子邮件错误。这是msend_form.js中的代码：
$.ajax({
url: "././mail/msend_form.php",
type: "POST",
data: {
fname: firstName,
gender: gender,
email: email
},
cache: false,
success: function() {
// Success message
$('#success').html("<div class='alert alert-success'>");
$('#success > .alert-success').html("<button type='button' class='close' data-dismiss='alert' aria-hidden='true'>×")
.append("</button>");
$('#success > .alert-success')
.append("<strong>Thank you for registering! </strong>");
$('#success > .alert-success')
.append('</div>');
//clear all fields
$('#contactForm').trigger("reset");
},
error: function() {
// Fail message
$('#success').html("<div class='alert alert-danger'>");
$('#success > .alert-danger').html("<button type='button' class='close' data-dismiss='alert' aria-hidden='true'>×")
.append("</button>");
$('#success > .alert-danger').append("<strong>Sorry " + firstname + ", it seems that my mail server is not responding. Please try again later!");
$('#success > .alert-danger').append('</div>');
//clear all fields
$('#contactForm').trigger("reset");
},
})
msend_form.php中的代码：
<?php
// insert in sql database
include '../db_connect.php';
// check if fields passed are empty
if(empty($_POST['fname']) ||
empty($_POST['email']) ||
!filter_var($_POST['email'],FILTER_VALIDATE_EMAIL))
{
echo "No arguments Provided!";
return false;
}
$fname = mysql_real_escape_string($_POST['fname']);
$email_address = mysql_real_escape_string($_POST['email']);
$gender = mysql_real_escape_string($_POST['gender']);
$ip = 1;
$sqlemail=mysql_query('SELECT * FROM `sdusers` WHERE email="'.$email_address.'"');
$res2=mysql_num_rows($sqlemail);
if($res2>=1)
{
echo 'Email already in use';
}
else
{
//insert query goes here
$sql='INSERT INTO `sdusers` (fname, gender, email, ip, time_registered) VALUES ("'.$fname.'","'.$gender.'","'.$email_address.'","'.$ip.'",CURRENT_TIMESTAMP)';
$res3=mysql_query($sql);
}
mysql_close($link);
return true;
?>
index.php中的代码：
<form name="sentMessage" id="contactForm" novalidate>
<div class="row control-group">
<div class="form-group col-xs-12 floating-label-form-group controls">
<label>First Name</label>
<input type="text" class="form-control" placeholder="First Name" id="fname" required data-validation-required-message="Please enter your first name.">
<p class="help-block text-danger"></p>
</div>
</div>
<div class="row control-group">
<div class="form-group col-xs-12 floating-label-form-group controls">
<label>Email Address</label>
<input type="email" class="form-control" placeholder="Email Address" id="email" required data-validation-required-message="Please enter your email address.">
<p class="help-block text-danger"></p>
</div>
</div>
<div class="row control-group">
<div class="form-group col-xs-12 floating-label-form-group controls">
<label>Gender</label>
<select id="gender" name="gender" class="form-control">
<option value="female">Female</option>
<option value="male">Male</option>
</select>
</div>
</div>
<br>
<div id="success"></div>
<div class="row">
<div class="form-group col-xs-12">
<button type="submit" class="btn btn-outline-dark">Submit</button>
</div>
</div>
</form>
由于
更新：
$.ajax({
url: "././mail/msend_form.php",
type: "POST",
data: {
fname: firstName,
gender: gender,
email: email
},
dataType: "json",
cache: false,
success: function(response) {
if(response.status == 1){
// ok
// Success message
$('#success').html("<div class='alert alert-success'>");
$('#success > .alert-success').html("<button type='button' class='close' data-dismiss='alert' aria-hidden='true'>×")
.append("</button>");
$('#success > .alert-success')
.append("<strong>Thank you for registering! We will contact you once this app is deployed soon. </strong>");
$('#success > .alert-success')
.append('</div>');
}else{
// fail
// Danger message
$('#success').html("<div class='alert alert-danger'>");
$('#success > .alert-danger').html("<button type='button' class='close' data-dismiss='alert' aria-hidden='true'>×")
.append("</button>");
$('#success > .alert-danger')
.append("<strong>Email address already in use. </strong>");
$('#success > .alert-danger')
.append('</div>');
}
//clear all fields
$('#contactForm').trigger("reset");
},
error: function() {
// Fail message
$('#success').html("<div class='alert alert-danger'>");
$('#success > .alert-danger').html("<button type='button' class='close' data-dismiss='alert' aria-hidden='true'>×")
.append("</button>");
$('#success > .alert-danger').append("<strong>Sorry " + firstname + ", it seems that my mail server is not responding. Please try again later!");
$('#success > .alert-danger').append('</div>');
//clear all fields
$('#contactForm').trigger("reset");
},
})
答案 0 :(得分：3)
成功回调
如果你想在error函数中说错误，你需要从后端发送标题500（服务器错误），例如
您也可以在成功回复中发送bool（int）标志：
{status: 1, message: "email does not exists"}
or
{status: 0, message: "email alredy taken"}
JavaScript的：
$.ajax({
url: "././mail/msend_form.php",
type: "POST",
data: {
fname: firstName,
gender: gender,
email: email
},
dataType: "json",
cache: false,
success: function(response) {
if(response.status == 1){
// ok
}else{
// fail
}
}
});
PHP
// check for existing email
$email_exists = false; // or true
$json = ['status' => 0, 'message' => 'Email exists']; // default
if(!$email_exists){
$json['status'] = 1;
$json['message'] = 'OK';
}
// delete all outputs before header (echo, print_r...)
header("Content-Type: application/json");
echo json_encode($json);
die;