我使用 Javascript SDK 创建了一个 facebook 应用程序。它适用于我（可能是因为该应用程序已链接到我的帐户），但它不适用于其他用户。当用户单击登录按钮时，会出现对话框并询问用户的 Facebook 用户名和密码。但是随后对话框消失了，登录按钮仍然存在。当用户再次单击登录按钮或刷新页面时，对话框会很快出现和消失。用户确实登录了他的 Facebook 帐户，但他没有登录到应用程序。
这是代码示例：
<div id="fb-root"></div>
<script>
window.fbAsyncInit = function() {
FB.init({
appId : 'xxxxxxxxxxx', // App ID
status : true, // check login status
cookie : true, // enable cookies to allow the server to access the session
xfbml : true // parse XFBML
});
// Here we subscribe to the auth.authResponseChange JavaScript event. This event is fired
// for any authentication related change, such as login, logout or session refresh. This means that
// whenever someone who was previously logged out tries to log in again, the correct case below
// will be handled.
FB.Event.subscribe('auth.authResponseChange', function(response) {
// Here we specify what we do with the response anytime this event occurs.
if (response.status === 'connected') {
// The response object is returned with a status field that lets the app know the current
// login status of the person. In this case, we're handling the situation where they
// have logged in to the app.
testAPI();
} else if (response.status === 'not_authorized') {
// In this case, the person is logged into Facebook, but not into the app, so we call
// FB.login() to prompt them to do so.
// In real-life usage, you wouldn't want to immediately prompt someone to login
// like this, for two reasons:
// (1) JavaScript created popup windows are blocked by most browsers unless they
// result from direct interaction from people using the app (such as a mouse click)
// (2) it is a bad experience to be continually prompted to login upon page load.
FB.login(function(response) {
if (response.authResponse) {
console.log('Welcome! Fetching your information.... ');
FB.api('/me', function(response) {
console.log('Good to see you, ' + response.name + '.');
});
} else {
console.log('User cancelled login or did not fully authorize.');
}
});
} else {
// In this case, the person is not logged into Facebook, so we call the login()
// function to prompt them to do so. Note that at this stage there is no indication
// of whether they are logged into the app. If they aren't then they'll see the Login
// dialog right after they log in to Facebook.
// The same caveats as above apply to the FB.login() call here.
FB.login(function(response) {
if (response.authResponse) {
console.log('Welcome! Fetching your information.... ');
FB.api('/me', function(response) {
console.log('Good to see you, ' + response.name + '.');
});
} else {
console.log('User cancelled login or did not fully authorize.');
}
});
}
});
};
// Load the SDK asynchronously
(function(d){
var js, id = 'facebook-jssdk', ref = d.getElementsByTagName('script')[0];
if (d.getElementById(id)) {return;}
js = d.createElement('script'); js.id = id; js.async = true;
js.src = "//connect.facebook.net/en_US/all.js";
ref.parentNode.insertBefore(js, ref);
}(document));
// Here we run a very simple test of the Graph API after login is successful.
// This testAPI() function is only called in those cases.
function testAPI() {
console.log('Welcome! Fetching your information.... ');
FB.api('/me', function(response) {
userData = response;
document.getElementById('name').value=userData.name;
document.getElementById('email').value=userData.email;
});
}
function submit(){
FB.api('/me', function(response) {
userData = response;
console.log(userData);
var form = $("#login-form form");
var serializedData=form.serialize()+'&id='+userData.id+'&email='+userData.email;
console.log(serializedData);
$.ajax({
url: './abc.php',
type: 'POST',
data: serializedData,
dataType:'json',
success: function (response) {},
error: function (xhr, ajaxOptions, thrownError){}
}); });
return false;
}
function logout(){
FB.logout(function(response) {
// Person is now logged out
console.log('You have logged out of Bookatdoor. Thank you!');
location.reload();
});
}
</script>
<!--
Below we include the Login Button social plugin. This button uses the JavaScript SDK to
present a graphical Login button that triggers the FB.login() function when clicked.
Learn more about options for the login button plugin:
/docs/reference/plugins/login/ -->
<fb:login-button show-faces="true" width="200" max-rows="1"></fb:login-button>
<br>
<div id="login-form">
<form action="" method="POST" onsubmit="submit();return false;">
Name: <input type="text" name="name" id="name" placeholder="Name">
Email: <input type="email" name="email" id="email" placeholder="Email" disabled>
Password: <input type="password" name="pwd" placeholder="Password">
Re-Password: <input type="password" placeholder="Re-Type Password">
College: <select name="college">
<?php
include "./connect.php";
$query="select * from college";
$result=mysqli_query($con,$query) or die(mysqli_error($con));
while ($row=mysqli_fetch_array($result))
{
echo "<option value='".$row['ID']."'>".$row['NAME']."</option>";
}
?>
</select>
</form>
<button onclick="submit()">Submit</button>
</div>
<button onclick="logout()">Logout</button>