Well you could add something like this at the start of the “click” handler:

$(“.reaction-post”).removeClass(“dislike like”);

This will, on a like/dislike button click, remove all “like” or “dislike” class to your .reaction-post, and then your script applies a new one depending on the clicked button.

Note: if you have many elements like this on your page (DOM) (many like and dislike button), you may want to restrict the class manipulation to the clicked element.

Edit: your code could look like this (not tested, but you get the idea):

<script>
$(function(){
    $('.reaction-post div').click(function(){
        var likable_element = $(this).parent(); //the .reaction-post, easier to manager multiple likeable element on the same page
        likable_element.removeClass("dislike like");
        
        var lod = $(this).attr('data-title');
        var idr = likable_element.attr('data-id');       
        localStorage.setItem(idr,lod);
        var ratinghis = localStorage.getItem(idr);
        likable_element.addClass(ratinghis);     
    });
});
</script>

I’m trying to generate a jQuery code with post review functionality. What I want to create looks like the image below:

Like and dislike buttons will be highlighted each time they are clicked. The reaction will be stored locally using localStorage.

This is my HTML code:

<div class="reaction-post" data-id="123456">
      <div class="like" data-title="like">Like</div>
      <div class="dislike" data-title="dislike">Dislike</div>
</div>

This is my jQuery code:

$(function(){
    $('.reaction-post div').click(function(){
        var lod = $(this).attr('data-title');
        var idr = $('.reaction-post').attr('data-id');       
        localStorage.setItem(idr,lod);
        var ratinghis = localStorage.getItem(idr);
        $('.reaction-post').addClass(ratinghis);     
    });
});

My problem is I don’t know how to removeClass after click to another option.