How to cancel likes on other site - facebook

Question

When you click the Like button https://graph.facebook.com/object_id/likes calls.
To cancel the Like what should I do?
I tried the following:
<code>
<script>
function doLike(objectId) {
$.ajax({
url: 'https://graph.facebook.com/'+objectId+'/likes',
type: 'post',
data: {
access_token: '....'
}
});
}
function doCancel(objectId) {
$.ajax({
url: '???',
type: 'post',
data: {
access_token: '....'
}
});
}
</script>
<input onclick="doLike('...')">Like</button>
<input onclick="doCancel('...')">Cancel</button>
</code>

Answer 1

This drove me nuts. Firefox/Chrome and probably everything else apparently won't allow HTTP DELETE ajax calls unless the host has previously communicated during the current request. So $.ajax{(type: 'delete', ... )} works for YOUR server url host but not anything else.
The workaround is something like:
$.ajax({
url: "https://graph.facebook.com/" + FB_ACTION_ID,
type: 'post',
data: { access_token: ACCESS_TOKEN,
'method': 'delete',
'_method' : 'delete' }
})

Answer 2

If you're looking for an API which allows you to remove a Like of a Facebook page, this is not possible.
If you're looking for an API to remove a Like of an object (via URL) - you can make a HTTP DELETE request to /LIKE_INSTANCE_ID which is the ID returned to your app when you posted the Open Graph like - otherwise it's not possible

Answer 3

You should be able to "unlike" an object ID simply by doing a HTTP DELETE. Using your code, it'd look something like this:
function doCancel(objectId) {
$.ajax({
url: 'https://graph.facebook.com/'+objectId+'/likes',
type: 'delete',
data: {
access_token: '....'
}
});
}
Alternatively, use the Facebook Javascript SDK, in which you can simply do:
FB.api("/" + objectId + "/likes", 'delete', callback);
where callback is the function to call when the unlike operation is complete.