Ajax and Django and jQuery - .attr()

I have a problem with Ajax and Django templates. I'm new to Ajax and jquery.

Console log at the end of the script prints undefined. I don't know why let answerid = $(this).attr("answer-id"); doesn't extract attribute from this line: <i class="upvote" answer-id="{{answer.id}}">&#8593</i>

I also want to know if using template tags in javascript scripts like here $.post("{% url 'upvote' %}", {answer_id:answerid}) is a good idea.

{% extends 'base.html' %}

{% block title %}{{question.title|truncatechars:52}}{% endblock %}

{% block content %}

<h1>{{question.title}}</h1>

<p>{{question.content}}</p>

{% for answer in question.answers.all %}

<h3>{{answer.author}}</h3>

<p>{{answer.content}}</p>

<p>

<i class="upvote" answer-id="{{answer.id}}">&#8593</i>

{{answer.votes.count}}

<i class="downvote" answer-id="{{answer.id}}">&#8595</i>

</p>

{% endfor %}

<form method="POST" action="{% url 'answer' question.id %}">

{% csrf_token %}

{{form.as_p}}

<input type="submit" value="Odpowiedz">

</form>

{% endblock %}

{% block javascript %}

{% load static %}

<script src="https://cdn.jsdelivr.net/npm/js-cookie@rc/dist/js.cookie.min.js"></script>

<script>

//upvote and downvote script

var csrftoken = window.Cookies.get('csrftoken');

function csrfSafeMethod(method) {

// these HTTP methods do not require CSRF protection

return (/^(GET|HEAD|OPTIONS|TRACE)$/.test(method));

}

$.ajaxSetup({

beforeSend: function(xhr, settings) {

if (!csrfSafeMethod(settings.type) && !this.crossDomain) {

xhr.setRequestHeader("X-CSRFToken", csrftoken);

}

}

});

$(".upvote").click( () => {

let answerid = $(this).attr("answer-id");

console.log(answerid);

$.post("{% url 'upvote' %}", {answer_id:answerid});

});

</script>

{% endblock %}

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