How to call a route & send data with javascript

I'm working with Laravel 5 and I've the following code

HTML

<div id="row">
  <textarea class="form-control" rows="3" id="comment" placeholder="Update your Post"></textarea>
</div>

<a href="#" id="btn-post" dusk="postButton" class="btn btn-primary" role="button" data-toggle="modal" data-target="#addPost">
  <span class="ion-plus-circled"> Post</span>
</a>

JS

$(document).ready(function(){

$("#btn-post").click(function(){
    $.ajaxSetup({
        headers: {
          'X-CSRF-TOKEN': $('meta[name="csrf-token"]').attr('content')
        }
    });

    var comment = $('textarea#comment').val();
    var postData = {
        post_content: comment.val();
        groupId: window.location.href.split("/")[4] // hack to get group id
    }

    console.log(postData);

    $.ajax({
        type: "POST",
        url: "/post",
        data: JSON.stringify(postData),
        contentType: "application/json; charset=utf-8",
        dataType: "json",
        success: function(data, status){
        $("#addPost").modal('toggle');
            //window.location.href = data.redirectTo;                  
        }
    });
  });
});

web.php

Route::post('post', 'GroupController@post');

GroupController.php

public function post(Request $request){
    $post_content = $request->input('post_content');
    $userId = Auth::user()->id;
    $groupId = $request->input('groupId');

    $post = PostGroup::firstOrNew(['group_id' => $groupId, 'post_content' => $post_content]);
    $post->user_id = $userId;

    $post->save();

    $redirectPath = '/groups/' . $groupId;
    return response()->json(['message' => 'Your post have been published! Take a look at',
        'redirectTo' => $redirectPath]);
}

What I want to do is to call the javascript function "btn-post" at the click of the link-button "Post". This function takes the content of the textarea (which I don't know if I wrote correctly) and sends it to the GroupController using the same javascript function, to the route "/post", calling the function "post" (as defined in web.php), but for some reason it doesn't work, and I don't know where I was wrong (I think the problem is in the javascript function, as if it weren't called).

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