like.js

$(document).ready(function(){
    $('.like-btn').on('click', function(){
        var post_id = $(this).data('id');
        $clicked_btn = $(this);
        if ($clicked_btn.hasClass('fa-thumbs-o-up')) {
            action = 'like';
        } else if($clicked_btn.hasClass('fa-thumbs-up')){
            action = 'unlike';
        }
        $.ajax({
        	url: 'likeserver.php',
        	type: 'post',
        	data: {
        		'action': action,
        		'post_id': post_id
        	},
  	        success: function(data){
  		        res = JSON.parse(data);
  		        if (action == "like") {
  		        	$clicked_btn.removeClass('fa-thumbs-o-up');
  		        	$clicked_btn.addClass('fa-thumbs-up');
  		        } else if(action == "unlike") {
  		        	$clicked_btn.removeClass('fa-thumbs-up');
  		        	$clicked_btn.addClass('fa-thumbs-o-up');
  		        }
  		        $clicked_btn.siblings('span.likes').text(res.likes);
  		        $clicked_btn.siblings('span.dislikes').text(res.dislikes);
  		        $clicked_btn.siblings('i.fa-thumbs-down').removeClass('fa-thumbs-down').addClass('fa-thumbs-o-down');
  	        }
       });
});
$('.dislike-btn').on('click', function(){
  var post_id = $(this).data('id');
  $clicked_btn = $(this);
  if ($clicked_btn.hasClass('fa-thumbs-o-down')) {
  	action = 'dislike';
  } else if($clicked_btn.hasClass('fa-thumbs-down')){
  	action = 'undislike';
  }
  $.ajax({
  	url: 'likeserver.php',
  	type: 'post',
  	data: {
  		'action': action,
  		'post_id': post_id
  	},
  	success: function(data){
  		res = JSON.parse(data);
  		if (action == "dislike") {
  			$clicked_btn.removeClass('fa-thumbs-o-down');
  			$clicked_btn.addClass('fa-thumbs-down');
  		} else if(action == "undislike") {
  			$clicked_btn.removeClass('fa-thumbs-down');
  			$clicked_btn.addClass('fa-thumbs-o-down');
  		}
  		$clicked_btn.siblings('span.likes').text(res.likes);
  		$clicked_btn.siblings('span.dislikes').text(res.dislikes);
  		$clicked_btn.siblings('i.fa-thumbs-up').removeClass('fa-thumbs-up').addClass('fa-thumbs-o-up');
  	}
  });	
});
});