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I have a simple rating system that logged in users can just click and it updates asynchronously.
However, I still want non-logged in users to see the rating mechanism (let’s say a simple “up” arrow) but trigger the Facebook authentication popup when they click the link.
Can you help? I have the regular fb:login button working just fine. But how can I trigger this action on a regular anchor tag (in addition to the fb:login button).
You need to call the FB.login method
https://developers.facebook.com/docs/reference/javascript/FB.login/
You can bind this to the button click for non logged in users, on the callback you can register the original rating action or refresh the page.