Php - Ajax like / dislike button

Question

I found this script from internet search by using like / dislike button for my script

http://wcetdesigns.com/view.php?dtype=tutorials&category=php&id=22

Everythings work good when using for single post but,

I want to use this rating script for all documents come from while cycle

For example, I have news script and all news are listed, and near to title you see like/dislike buttons. (like stackoverflow web page) and I want to rate all this content separately. In this script, I couldn't separate article id's in same page

Can you please help me about that?

Answer 1

First, you need to specify for each button which article is it for, you can easily do it with data- attribute

<button class="votebutton" data-article="1" data-vote="1">Up vote</button>
<button class="votebutton" data-article="1" data-vote="-1">Down vote</button>
<span class="votes" data-article="1"><?=//print the current number of votes of this article//?>

Now you need to do something when the button is clicked, so your javascript would look something like that:

$('.votebutton').on("click", function(){
  vote = $(this).attr("data-vote");
  article = $(this).attr("data-article");
  rateArticle(vote, article);
})

now you need the rateArticle() function that would look something like this:

function rateArticle(vote, article){ 
  var data = 'vote='+rating+'&articleID='+article;
  $.ajax({
     type: 'POST',
     url: 'rateArticle.php', 
     data: data,
     success: function(votes){
         $('.vote[data-article='+article+']').html(votes); 
     }
   });
}

on the server side, the rateArticle.php file that you'll post to would look something like this:

$vote = $_POST['vote'];
$articleID = $_POST['articleID'];
$currentVotes = ; //fill it with the votes that the article currently have

if($vote != "-1" || vote != "1"){
  //goddamn script kids messing with us again, let's put them back where they belong
  header("Location: http://www.lemonparty.com"); //probably not this, but you can think of something
}

if(userHasAlreadyVoted()){ //if user has already voted we just return the current number of votes
  echo $currentVotes;
}else{
  $newVotes = $currentVotes + $vote;
  //save newVotes to db...
  echo $newVotes;
}

And that's about it...