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[facebook] FB login api (javascript SDK),客製化按鈕及串接FB登入個人資料

Published: at 05:43 AM (5 min read)

FB 登入實作的部分,我想大家參考官方文件應該就可以很清楚了,有範例程式碼加上全中文,我想應該沒什麼困難!

這邊想記錄的主要是 FB 客製化登入按鈕實作FB登入的個人資料串接。

PS. 囧,當初接FB登入的時候一直拿不到使用者 email !!


備註:在以下步驟之前,要先自己參考官方文件說明創建一個facebook的APP

  1. FB客製化按鈕實作 首先我們先使用HTML及CSS製作一個客製化的按鈕

    [html] [/html]

    接下來我們必須寫javascript的部分,我們需要存取使用者公開資料與email

    [javascript] // javascript document // This is called with the results from from FB.getLoginStatus(). function statusChangeCallback(response) {     console.log(‘statusChangeCallback’);     console.log(response);     // The response object is returned with a status field that lets the     // app know the current login status of the persopren.     // Full docs on the response object can be found in the documentation     // for FB.getLoginStatus().     if (response.status === ‘connected’) {         // Logged into your app and Facebook.         login(response.authResponse.accessToken);     } else if (response.status === ‘not_authorized’) {         // The person is logged into Facebook, but not your app.         console.log(‘The person is logged into Facebook, but not your app’);     } else {         // The person is not logged into Facebook, so we’re not sure if         // they are logged into this app or not.         console.log(“The person is not logged into Facebook”);     } } // This function is called when someone finishes with the Login // Button.  See the onlogin handler attached to it in the sample // code below. function checkLoginState() {     FB.getLoginStatus(function(response) {         statusChangeCallback(response);     }); } window.fbAsyncInit = function() {     FB.init({         appId      : “{{your-app-id}}”,         cookie     : true,  // enable cookies to allow the server to access                             // the session         xfbml      : true,  // parse social plugins on this page         version    : ‘v2.2’ // use version 2.2     }); }; // Now that we’ve initialized the JavaScript SDK, we call // FB.getLoginStatus().  This function gets the state of the // person visiting this page and can return one of three states to // the callback you provide.  They can be: // // 1. Logged into your app (‘connected’) // 2. Logged into Facebook, but not your app (‘not_authorized’) // 3. Not logged into Facebook and can’t tell if they are logged into //    your app or not. // // These three cases are handled in the callback function. // Load the SDK asynchronously (function(d, s, id) { var js, fjs = d.getElementsByTagName(s)[0]; if (d.getElementById(id)) return; js = d.createElement(s); js.id = id; js.src = “//connect.facebook.net/en_US/sdk.js”; fjs.parentNode.insertBefore(js, fjs); }(document, “script”, “facebook-jssdk”)); // Here we run a very simple test of the Graph API after login is // successful.  See statusChangeCallback() for when this call is made. function loginNEMI(token) {     // 把 access_token 傳至後端再做資料拿取     console.log(“Welcome!  Fetching your information… ”);     var xhr=new XMLHttpRequest();     xhr.open(“POST”, “/login”, true);     xhr.setRequestHeader(“Content-type”, “application/x-www-form-urlencoded”);     xhr.onreadystatechange=function()     {       if(xhr.readyState === 4 && xhr.status === 200)       {           if(JSON.parse(xhr.responseText).status === “ok”)             location.href=“/index”;           else             alert(“something wrong!”);       }      };     xhr.send(“token=“+token); } // custom fb login button function fb_login() {     // FB 第三方登入,要求公開資料與email     FB.login(function(response)     {         statusChangeCallback(response);         console.log(response);     }, {scope: ‘public_profile,email’}); } [/javascript]

    這樣就可以完成一個客製化的FB登入按鈕囉!

  2. FB登入個人資料串接 接下來我們進一步的在後端嘗試拿取使用者所授權的個人資料 我們可以透過上面編寫的程式碼,在後端得到使用者的 access token 透過 graph api 去存取使用者的個人資料 例如: GET  https://graph.facebook.com/me?fields=id,name,email&access\_token=’+**token** graph api 會回傳:

    {   “id”: “xxx”,   “name”: “xxx”,   “email”: “[email protected]” } 這樣就可以成功地拿取到使用者的資訊囉。 另外,也可以透過 Graph API 測試工具做測試

    PS. 記得 fields 一定要填上你所要拿取的欄位,不然只能拿到基本的ID與名字。

參考資料:

https://developers.facebook.com/docs/facebook-login/web