手动使用FB SDK实现Facebook‘Continue as {Name}’的权限疑问

Absolutely! You can grab the user's name without requesting any extra permissions—here's how to make that work while keeping your manual FB SDK implementation intact:

First off, Facebook's public_profile permission is granted by default when a user logs into your app (no extra approval requests needed for this). This permission includes access to the user's full name, which is exactly what you need for that "Continue as {Name}" flow.

Here's a step-by-step breakdown tailored to your setup:

• Initialize the SDK correctly: Make sure you load the SDK with your app ID and enable status: true (so it checks if the user is already logged in when the page loads):

  window.fbAsyncInit = function() {
    FB.init({
      appId      : 'YOUR_APP_ID',
      cookie     : true,
      xfbml      : false, // Skip since you're not using the official button
      version    : 'v18.0' // Use the latest SDK version available
    });
  
    // Check if user is already logged in on page load
    FB.getLoginStatus(function(response) {
      if (response.status === 'connected') {
        fetchUserName();
      }
    });
  };
  

• Trigger login with default scope: When you call FB.login(), you can explicitly include public_profile in the scope (it’s included by default, but being explicit avoids edge cases):

  document.getElementById('your-custom-login-btn').addEventListener('click', function() {
    FB.login(function(response) {
      if (response.authResponse) {
        // Login succeeded, fetch the user's name
        fetchUserName();
      } else {
        console.log('User cancelled login or didn’t fully authorize.');
      }
    }, { scope: 'public_profile' });
  });
  

• Fetch and display the user’s name: After a successful login (or detecting an existing session), use FB.api() to grab just the name field (keep it lightweight):

  function fetchUserName() {
    FB.api('/me', { fields: 'name' }, function(response) {
      if (response.name) {
        // Update your UI to show the personalized button
        document.getElementById('continue-btn').textContent = `Continue as ${response.name}`;
      }
    });
  }
  

A quick heads-up: If a user has previously denied the public_profile permission (rare, since it’s a basic, non-intrusive access), you’d need to re-request it. But in most cases, users accept this default permission without hesitation.

This approach keeps your manual SDK workflow intact and doesn’t require any extra permission requests to Facebook—perfect for building that personalized "Continue as {Name}" experience!

内容的提问来源于stack exchange，提问作者johnmarinelli