用於顯示Facebook登錄按鈕不起作用的Javascript代碼
[英]Javascript code for showing facebook login button not working
問題描述
我有一個腳本來顯示某些網站的facebook登錄按鈕：
<html>
<head></head>
<body>
<div id="fb-root"></div>
<script>
window.fbAsyncInit = function() {
FB.init({
appId : 'myID', // App ID
channelUrl : 'localhost:8080', // Channel File
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();
} 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();
}
});
};
// 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) {
console.log('Good to see you, ' + response.name + '.');
});
}
</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>
</body>
</html>
我從以下位置獲得了此代碼：
https://developers.facebook.com/docs/facebook-login/getting-started-web/
我是Java語言的新手，並按原樣復制了腳本：並將其粘貼到我嘗試使用瀏覽器查看的.html文件中。 但是我什么也沒看見。 請為我提供新的建議。
1 個解決方案
解決方案1
1 已采納 2013-10-04 13:43:43
如果您在開發人員工具中檢查控制台，您將從Facebook javascript代碼中看到以下警告：
Invalid App Id: Must be a number or numeric string representing the application id.
隨后出現此JavaScript錯誤：
Uncaught TypeError: Cannot read property '1' of null
您必須用自己的數據替換代碼中的這兩行，以使其起作用：
appId : 'myID', // App ID
channelUrl : 'localhost:8080', // Channel File
創建Facebook應用程序時，您將獲得appId ，如所鏈接的教程所示。
同樣，您將需要指定channelUrl指向文件（例如，包含以下代碼行的channel.html ：
<script src="//connect.facebook.net/en_US/all.js"></script>
但是，請仔細閱讀您鏈接到的指南，而不是盲目地復制粘貼代碼，您可能會既理解它，又能夠在幾分鍾之內使其起作用:)
Facebook Javascript登錄按鈕
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