Ajax在Django中不起作用

Question

I'm trying to use ajax in Django to post comment in a news website.However it doesn't work.When I click the submit button,it still refreshes the page and make no difference like no ajax.

I'm really new in Django and Ajax.Any friend can help me solve it?

Here is my view.py:

def newsDetailView(request, news_pk):
    news = News.objects.get(id=news_pk)
    title = news.title
    author = news.author_name
    add_time = news.add_time
    content = news.content
    category = news.category
    tags = news.tag.annotate(news_count=Count('news'))

    all_comments = NewsComments.objects.filter(news=news)

    comment_form = CommentForm(request.POST or None)
    if request.method == 'POST' and comment_form.is_valid():
        if not request.user.is_authenticated:
            return render(request, 'login.html', {})
        comments = comment_form.cleaned_data.get("comment")
        news_comment = NewsComments(user=request.user, comments=comments, news=news)
        news_comment.save()

    return render(request, "news_detail.html", {
        'title': title,
        'author': author,
        'add_time': add_time,
        'content': content,
        'tags': tags,
        'category': category,
        'all_comments': all_comments,
        'comment_form': comment_form
    })

Here is my news_detail template where I get form data:

{% if user.is_authenticated %}
<form id="js-pl-submit" method="POST" action="">{% csrf_token %}
{% for field in comment_form %}
{% for error in field.errors %}
<div class="alert alert-warning text-center mb-3" role="alert">{{ error }}</div>
{% endfor %}
{% endfor %}

Here in my news_detail template I render all the comments to the template:

 {% for user_comments in all_comments %}
<img class="mr-3 comment-avatar rounded-circle"src="{{ MEDIA_URL }}{{ user_comments.user.image }}"alt="Generic placeholder image">
<div class="media-body">
<h6 class="mt-0 mb-1">{{ user_comments.user.username }}</h6>
{{ user_comments.comments }}
</div>
<span>{{ user_comments.add_time }}</span>
{% endfor %}

Here is my Ajax in news_detail template:

$('#js-pl-submit').on('click', function(){
    var comments = $("#js-pl-textarea").val()
    if(comments == ""){
        alert("评论不能为空")
        return false
    }
    $.ajax({
        cache: false,
        type: "POST",
        url:"",
        data:{'news_pk':{{ news.id }}, 'comments':comments},
        async: true,
        beforeSend:function(xhr, settings){
            xhr.setRequestHeader("X-CSRFToken", "{{ csrf_token }}");
        },
        success: function(data) {
            if(data.status == 'fail'){
                if(data.msg == '用户未登录'){
                    window.location.href="login";
                }else{
                    alert(data.msg)
                }
            }else if(data.status == 'success'){
                window.location.reload();//刷新当前页面.
            }
        },
    });
    return false;
});

Finally here is my form.py of the comment.

def words_validator(comment):
    if len(comment) < 4:
        raise ValidationError("亲，最少写两个字")


class CommentForm(forms.Form):
    comment = forms.CharField(widget=forms.Textarea(), validators=[words_validator])

Answer 1

Add click event on button not on form and You have to change that to button implicitly. By default the type of a button is submit.

<form method="POST" action="">
<button type="button" id="js-pl-submit"> 

Remove id of form. Submit button submits form-data and reload the page.