This isn't a jQuery issue, it's a JavaScript/ECMAScript issue. When you use
the "arrow function" style like "() => { ...code... }" then certain
variables are not bound into the function contact, including "this".
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/Arrow_functions
To get "this" inside your event handler you need to use "function () {
code... }".
$(".upvote").click( function () {
let answerid = $(this).attr("answer-id");
console.log(answerid);
$.post("{% url 'upvote' %}", {answer_id:answerid});
});
But also, it's bad bad form to define your own attribute names on HTML. Use
the "data-answer-id" attribute name to do this, and in your code access it
with $(this).data("answer-id").
On Sun, May 31, 2020 at 2:19 PM Jan Gregorczyk <jnk.gregorc...@gmail.com>
wrote:
> 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}}">↑</i>
> I also want to know if using template tags in javascript scripts like here
> $.post("{% url 'upvote' %}", {answer_id:answerid}) is a good idea.
>
>
> {% extends 'base.html' %}
> {% block title %}{{question.title|truncatechars:52}}{% endblock %}
> {% block content %}
> <h1>{{question.title}}</h1>
> <p>{{question.content}}</p>
> {% for answer in question.answers.all %}
> <h3>{{answer.author}}</h3>
> <p>{{answer.content}}</p>
> <p>
> <i class="upvote" answer-id="{{answer.id}}">↑</i>
> {{answer.votes.count}}
> <i class="downvote" answer-id="{{answer.id}}">↓</i>
> </p>
> {% endfor %}
> <form method="POST" action="{% url 'answer' question.id %}">
> {% csrf_token %}
> {{form.as_p}}
> <input type="submit" value="Odpowiedz">
> </form>
> {% endblock %}
> {% block javascript %}
> {% load static %}
> <script src="
> https://cdn.jsdelivr.net/npm/js-cookie@rc/dist/js.cookie.min.js";></script>
> <script>
> //upvote and downvote script
> var csrftoken = window.Cookies.get('csrftoken');
> function csrfSafeMethod(method) {
> // these HTTP methods do not require CSRF protection
> return (/^(GET|HEAD|OPTIONS|TRACE)$/.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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