favorite-ajax.php

//app/routes.php

Route::post('favorites', ['as' => 'favorites.store', function()
{
    
	if (Request::ajax()) {

		$postId = Input::get('post-id');

		$favorites = DB::table('favorites')->whereUserId(Auth::user()->id)->lists('post_id');
		
		if (!in_array($postId, $favorites)) {

		Auth::user()->favorites()->attach($postId);

		}

		return Post::find($postId)->favorites()->count();

		
		//echo "Process ajax request";
	
	} else {

		Auth::user()->favorites()->attach(Input::get('post-id'));
    
        return Redirect::back();
    }
}])->before('auth|csrf');




//app/views/layout.blade.php


    <script>
    (function(){
    	$('.post').on('submit', function(e) {
    		var that = $(this);
    		$.ajax({
				type: 'POST', 
				url: '{{ url('favorites') }}',
				data: that.serialize()
			}).then(function(data) {
				that.find('.count').html(data);
				that.find('.submit i').removeClass('not-favorited');
				that.find('.submit i').addClass('favorited');
			})

		e.preventDefault();
		
		
		});
    })();

	    
    </script>