Is there a way to display the current number of members of my Facebook group on a SquareSpace code block (which only accepts HTML and JavaScript)?
Totally.
You can use Facebook Graph to accomplish what you want. Using an ordinary HTTPS request, I got this JSON-formatted results :
{
"id": "165227436975532",
"about": "Salon de Th\u00e9 style traditionnelle ..!!",
"can_post": false,
"category": "Restaurant/Cafe",
"category_list": [
{
"id": "203462172997785",
"name": "Tea Room"
}
],
"checkins": 66,
"cover": {
"cover_id": "476669145831358",
"offset_x": 0,
"offset_y": 54,
"source": "https://scontent.xx.fbcdn.net/hphotos-xpt1/v/t1.0-9/11536065_476669145831358_6075091507244297763_n.jpg?oh=7c6940ee3f2566884609fc59da224b67&oe=563A1B1D",
"id": "476669145831358"
},
"has_added_app": false,
"is_community_page": false,
"is_published": true,
"likes": 1246,
"link": "https://www.facebook.com/arabiccafe",
"location": {
"city": "Sousse",
"country": "Tunisia",
"latitude": 35.864546,
"longitude": 10.5988045,
"street": "Hammem Sousse",
"zip": "4011"
},
"name": "Arabica Cafe",
"parking": {
"lot": 0,
"street": 0,
"valet": 0
},
"phone": "21770198",
"talking_about_count": 6,
"username": "arabiccafe",
"were_here_count": 66
}
In order to get these info, you can use a normal XHR request (or jQuery.ajax if you use jQuery) and make a GET request to this URL :
https://graph.facebook.com/arabiccafe?access_token={your_token}
You can generate a token following these directives.