搭建自己的博客（二十二）：通过ajax提交评论信息，并增加公式编辑功能

编辑功能使用到了ckeditor的MathJax组件。ajax提交评论可以不用刷新浏览器。

1、变化的部分

2、上代码：

ul.blog-types,ul.blog-dates {
    list-style-type: none;
}

div.blog:not(:last-child) {
    margin-bottom: 2em;
    padding-bottom: 1em;
    border-bottom: 1px solid #eee;
}

div.blog h3 {
    margin-top: 0.5em;
}

div.blog-info p {
    margin-bottom: 0;
}
div.blog-info p span{
    margin-right: 10px;
}

div.blog-info-description {
    list-style-type: none;
    margin-bottom: 1em;
}

ul.blog-info-description li {
    display: inline-block;
    margin-right: 1em;
}

div.paginator {
    text-align: center;
}

div.container {
    max-width: 80%;
}

div.comment-area{
    margin-top: 2em;
}

h3.comment-area-title{
    border-bottom: 1px solid #ccc;
    padding-bottom: 0.4em;
}

div.django-ckeditor-widget {
    width: 100%;
}

{# 引用模板 #}
{% extends 'base.html' %}
{% load staticfiles %}

{% block header_extends %}
    <link rel="stylesheet" href="{% static 'blog/blog.css' %}">
    {#  处理公式  #}
    <script src='https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.5/MathJax.js?config=TeX-MML-AM_CHTML'
            async></script>
    <script type="text/javascript" src="{% static "ckeditor/ckeditor-init.js" %}"></script>
    <script type="text/javascript" src="{% static "ckeditor/ckeditor/ckeditor.js" %}"></script>
{% endblock %}


{# 标题 #}
{% block title %}
    {{ blog.title }}
{% endblock %}

{# 内容#}
{% block content %}
    <div class="container">
        <div class="row">
            <div class="col-10 offset-1">
                <ul class="blog-info-description">
                    <h3>{{ blog.title }}</h3>
                    <li>作者：{{ blog.author }}</li>
                    {# 时间过滤器让时间按照自己需要的格式过滤 #}
                    <li>发布日期：{{ blog.created_time|date:"Y-m-d H:i:s" }}</li>
                    <li>分类：
                        <a href="{% url 'blogs_with_type' blog.blog_type.pk %}">
                            {{ blog.blog_type }}
                        </a>
                    </li>
                    <li>阅读({{ blog.get_read_num }})</li>
                </ul>
                <p class="blog-content">{{ blog.content|safe }}</p>


                <p>上一篇：
                    {% if previous_blog %}
                        <a href="{% url 'blog_detail' previous_blog.pk %}">{{ previous_blog.title }}</a>
                    {% else %}
                        <span>没有了</span>
                    {% endif %}
                </p>
                <p>下一篇：
                    {% if next_blog %}
                        <a href="{% url 'blog_detail' next_blog.pk %}">{{ next_blog.title }}</a>
                    {% else %}
                        <span>没有了</span>
                    {% endif %}
                </p>
            </div>
        </div>
        <div class="row">
            <div class="col-10 offset-1">
                <div class="comment-area">
                    <h3 class="comment-area-title">提交评论</h3>
                    {% if user.is_authenticated %}
                        <form id="comment-form" action="{% url 'update_comment' %}" method="post"
                              style="overflow: hidden">
                            {% csrf_token %}
                            <label for="form-control">{{ user.username }},欢迎评论～</label>
                            {% for field in comment_form %}
                                {{ field }}
                            {% endfor %}
                            <span id="comment-error" class="text-danger float-left"></span>
                            <input type="submit" value="评论" class="btn btn-primary float-right">
                        </form>
                    {% else %}
                        您尚未登录，登录之后方可评论
                        {# 提交登录的时候带上从哪里访问的路径 #}
                        <a class="btn btn-primary" href="{% url 'login' %}?from={{ request.get_full_path }}">登录</a>
                        <span> or </span>
                        <a class="btn-danger btn" href="{% url 'register' %}?from={{ request.get_full_path }}">注册</a>
                    {% endif %}
                </div>
                <div class="-comment-area">
                    <h3 class="comment-area-title">评论列表</h3>
                    <div id="comment-list">
                        {% for comment in comments %}
                            <div>
                                {{ comment.user.username }}
                                {{ comment.comment_time|date:"Y-m-d H:i:s" }}
                                {{ comment.text|safe }}
                            </div>
                        {% empty %}

                        {% endfor %}
                    </div>

                </div>
            </div>
        </div>
    </div>
{% endblock %}

{% block js %}
    <script>
        $('#comment-form').submit(function () {
            // 获取错误框
            let comment_error = $('#comment-error');
            comment_error.text('');

            // 更新数据到textarea
            CKEDITOR.instances['id_text'].updateElement();
            let comment_text = CKEDITOR.instances['id_text'].document.getBody().getText().trim();
            // 判断是否为空
            if (!(CKEDITOR.instances['id_text'].document.getBody().find('img')['$'].length !== 0 || comment_text !== '')) {
                // 显示错误信息
                comment_error.text('评论内容不能为空');
                return false;
            }
            //异步提交
            $.ajax({
                url: "{% url 'update_comment' %}",
                type: 'POST',
                data: $(this).serialize(),// 序列化表单值
                cache: false, // 关闭缓存
                success: function (data) {

                    if (data['status'] === 'SUCCESS') {
                        console.log(data);
                        //  插入数据
                        //  es6写法
                        let comment_html = `<div>${data["username"]} (${data["comment_time"]}): ${data["text"]}</div>`;
                        $('#comment-list').prepend(comment_html);
                        //  清空编辑框的内容
                        CKEDITOR.instances['id_text'].setData('');
                    } else {
                        // 显示错误信息
                        comment_error.text(data['message'])
                    }
                },
                error: function (xhr) {
                    console.log(xhr);
                }
            });
            return false;
        })
    </script>

    <script>
        $(".nav-blog").addClass("active").siblings().removeClass("active");
    </script>
{% endblock %}

{# 引用模板 #}
{% extends 'base.html' %}
{% load staticfiles %}

{% block header_extends %}
    <link rel="stylesheet" href="{% static 'blog/blog.css' %}">
    {#  处理公式  #}
    <script src='https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.5/MathJax.js?config=TeX-MML-AM_CHTML'
            async></script>
    <script type="text/javascript" src="{% static "ckeditor/ckeditor-init.js" %}"></script>
    <script type="text/javascript" src="{% static "ckeditor/ckeditor/ckeditor.js" %}"></script>
{% endblock %}


{# 标题 #}
{% block title %}
    {{ blog.title }}
{% endblock %}

{# 内容#}
{% block content %}
    <div class="container">
        <div class="row">
            <div class="col-10 offset-1">
                <ul class="blog-info-description">
                    <h3>{{ blog.title }}</h3>
                    <li>作者：{{ blog.author }}</li>
                    {# 时间过滤器让时间按照自己需要的格式过滤 #}
                    <li>发布日期：{{ blog.created_time|date:"Y-m-d H:i:s" }}</li>
                    <li>分类：
                        <a href="{% url 'blogs_with_type' blog.blog_type.pk %}">
                            {{ blog.blog_type }}
                        </a>
                    </li>
                    <li>阅读({{ blog.get_read_num }})</li>
                </ul>
                <p class="blog-content">{{ blog.content|safe }}</p>


                <p>上一篇：
                    {% if previous_blog %}
                        <a href="{% url 'blog_detail' previous_blog.pk %}">{{ previous_blog.title }}</a>
                    {% else %}
                        <span>没有了</span>
                    {% endif %}
                </p>
                <p>下一篇：
                    {% if next_blog %}
                        <a href="{% url 'blog_detail' next_blog.pk %}">{{ next_blog.title }}</a>
                    {% else %}
                        <span>没有了</span>
                    {% endif %}
                </p>
            </div>
        </div>
        <div class="row">
            <div class="col-10 offset-1">
                <div class="comment-area">
                    <h3 class="comment-area-title">提交评论</h3>
                    {% if user.is_authenticated %}
                        <form id="comment-form" action="{% url 'update_comment' %}" method="post"
                              style="overflow: hidden">
                            {% csrf_token %}
                            <label for="form-control">{{ user.username }},欢迎评论～</label>
                            {% for field in comment_form %}
                                {{ field }}
                            {% endfor %}
                            <span id="comment-error" class="text-danger float-left"></span>
                            <input type="submit" value="评论" class="btn btn-primary float-right">
                        </form>
                    {% else %}
                        您尚未登录，登录之后方可评论
                        {# 提交登录的时候带上从哪里访问的路径 #}
                        <a class="btn btn-primary" href="{% url 'login' %}?from={{ request.get_full_path }}">登录</a>
                        <span> or </span>
                        <a class="btn-danger btn" href="{% url 'register' %}?from={{ request.get_full_path }}">注册</a>
                    {% endif %}
                </div>
                <div class="-comment-area">
                    <h3 class="comment-area-title">评论列表</h3>
                    <div id="comment-list">
                        {% for comment in comments %}
                            <div>
                                {{ comment.user.username }}
                                {{ comment.comment_time|date:"Y-m-d H:i:s" }}
                                {{ comment.text|safe }}
                            </div>
                        {% empty %}

                        {% endfor %}
                    </div>

                </div>
            </div>
        </div>
    </div>
{% endblock %}

{% block js %}
    <script>
        $('#comment-form').submit(function () {
            // 获取错误框
            let comment_error = $('#comment-error');
            comment_error.text('');

            // 更新数据到textarea
            CKEDITOR.instances['id_text'].updateElement();
            let comment_text = CKEDITOR.instances['id_text'].document.getBody().getText().trim();
            // 判断是否为空
            if (!(CKEDITOR.instances['id_text'].document.getBody().find('img')['$'].length !== 0 || comment_text !== '')) {
                // 显示错误信息
                comment_error.text('评论内容不能为空');
                return false;
            }
            //异步提交
            $.ajax({
                url: "{% url 'update_comment' %}",
                type: 'POST',
                data: $(this).serialize(),// 序列化表单值
                cache: false, // 关闭缓存
                success: function (data) {

                    if (data['status'] === 'SUCCESS') {
                        console.log(data);
                        //  插入数据
                        //  es6写法
                        let comment_html = `<div>${data["username"]} (${data["comment_time"]}): ${data["text"]}</div>`;
                        $('#comment-list').prepend(comment_html);
                        //  清空编辑框的内容
                        CKEDITOR.instances['id_text'].setData('');
                    } else {
                        // 显示错误信息
                        comment_error.text(data['message'])
                    }
                },
                error: function (xhr) {
                    console.log(xhr);
                }
            });
            return false;
        })
    </script>

    <script>
        $(".nav-blog").addClass("active").siblings().removeClass("active");
    </script>
{% endblock %}

# -*- coding: utf-8 -*-
# @Time    : 18-11-20 下午10:47
# @Author  : Felix Wang

from django import forms
from django.contrib.contenttypes.models import ContentType
from django.db.models import ObjectDoesNotExist
from ckeditor.widgets import CKEditorWidget


class CommentForm(forms.Form):
    content_type = forms.CharField(widget=forms.HiddenInput)
    object_id = forms.IntegerField(widget=forms.HiddenInput)
    text = forms.CharField(widget=CKEditorWidget(config_name='comment_ckeditor'),
                           error_messages={'required': '评论内容不能为空'})

    def __init__(self, *args, **kwargs):
        if 'user' in kwargs:
            self.user = kwargs.pop('user')
        super().__init__(*args, **kwargs)

    # 表单验证
    def clean(self):
        # 判断用户是否登录
        if self.user.is_authenticated:
            self.cleaned_data['user'] = self.user
        else:
            raise forms.ValidationError('用户尚未登录')

        content_type = self.cleaned_data['content_type']
        object_id = self.cleaned_data['object_id']
        try:
            model_class = ContentType.objects.get(model=content_type).model_class()
            model_obj = model_class.objects.get(pk=object_id)
            self.cleaned_data['content_object'] = model_obj
        except ObjectDoesNotExist as e:
            raise forms.ValidationError('评论对象不存在')

        return self.cleaned_data

from django.shortcuts import render, reverse, redirect
from django.http import JsonResponse
from .models import Comment
from django.contrib.contenttypes.models import ContentType
from .forms import CommentForm
import re
import copy


def update_commit(requests):
    comment_form = CommentForm(requests.POST, user=requests.user)
    if comment_form.is_valid():
        comment = Comment()
        comment.user = comment_form.cleaned_data['user']
        comment.text = comment_form.cleaned_data['text']
        comment.content_object = comment_form.cleaned_data['content_object']
        comment.save()
        # 返回数据
        data = {
            'status': 'SUCCESS',
            'username': comment.user.username,
            'comment_time': comment.comment_time.strftime('%Y-%m-%d %H:%M:%S'),
            'text': comment.text.strip(),
        }
    else:
        data = {
            'status': 'ERROR',
            'message': list(comment_form.errors.values())[0][0],
        }
    return JsonResponse(data)

# -*- coding: utf-8 -*-
# @Time    : 18-11-20 下午8:10
# @Author  : Felix Wang

from django import forms
from django.contrib import auth
from django.contrib.auth.models import User


class LoginForm(forms.Form):
    username = forms.CharField(label='用户名', required=True,
                               widget=forms.TextInput(attrs={'class': 'form-control', 'placeholder': '请输入用户名'}))
    # widget指定input标签类型
    password = forms.CharField(label='密码',
                               widget=forms.PasswordInput(attrs={'class': 'form-control', 'placeholder': '请输入密码'}))

    def clean(self):  # 验证数据
        username = self.cleaned_data['username']
        password = self.cleaned_data['password']
        user = auth.authenticate(username=username, password=password)
        if user is None:
            raise forms.ValidationError('用户名或密码错误')
        self.cleaned_data['user'] = user  # 将验证过的user放入clean_data
        return self.cleaned_data


class RegisterForm(forms.Form):
    # 用户名字段
    username = forms.CharField(label='用户名',
                               max_length=30,
                               min_length=3,
                               required=True,
                               widget=forms.TextInput(attrs={'class': 'form-control', 'placeholder': '请输入用户名'}))
    # 邮箱字段
    email = forms.EmailField(label='邮箱',
                             min_length=3,
                             required=True,
                             widget=forms.EmailInput(attrs={'class': 'form-control', 'placeholder': '请输入邮箱'}))
    # 密码字段
    password = forms.CharField(label='密码',
                               min_length=6,
                               required=True,
                               widget=forms.PasswordInput(
                                   attrs={'class': 'form-control', 'placeholder': '请输入密码'}))
    # 再次输入密码
    password_again = forms.CharField(label='确认密码',
                                     min_length=6,
                                     required=True,
                                     widget=forms.PasswordInput(
                                         attrs={'class': 'form-control', 'placeholder': '请再输入一次密码'}))

    def clean_username(self):
        username = self.cleaned_data['username']
        if User.objects.filter(username=username).exists():
            raise forms.ValidationError('用户名已存在')
        return username

    def clean_email(self):
        email = self.cleaned_data['email']
        if User.objects.filter(email=email).exists():
            raise forms.ValidationError('邮箱已存在')

        return email

    def clean_password_again(self):
        password = self.cleaned_data['password']
        password_again = self.cleaned_data['password_again']
        if password != password_again:
            raise forms.ValidationError('两次输入的密码不一致')
        return password_again

"""
Django settings for myblog project.

Generated by 'django-admin startproject' using Django 2.1.3.

For more information on this file, see
https://docs.djangoproject.com/en/2.1/topics/settings/

For the full list of settings and their values, see
https://docs.djangoproject.com/en/2.1/ref/settings/
"""

import os

# Build paths inside the project like this: os.path.join(BASE_DIR, ...)
BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))

# Quick-start development settings - unsuitable for production
# See https://docs.djangoproject.com/en/2.1/howto/deployment/checklist/

# SECURITY WARNING: keep the secret key used in production secret!
SECRET_KEY = 'ea+kzo_5k^6r7micfg@lar1(rfdc08@b4*+w5d11=0mp1p5ngr'

# SECURITY WARNING: don't run with debug turned on in production!2.
DEBUG = True

ALLOWED_HOSTS = ['*']

# Application definition

INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'ckeditor',
    'ckeditor_uploader',
    'blog.apps.BlogConfig',  # 将自己创建的app添加到设置中
    'read_statistics.apps.ReadStatisticsConfig',  # 注册阅读统计app
    'comment.apps.CommentConfig',  # 注册评论

]

MIDDLEWARE = [
    'django.middleware.security.SecurityMiddleware',
    'django.contrib.sessions.middleware.SessionMiddleware',
    'django.middleware.common.CommonMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'django.contrib.messages.middleware.MessageMiddleware',
    'django.middleware.clickjacking.XFrameOptionsMiddleware',
    'blog.middleware.mymiddleware.My404',  # 添加自己的中间件
]

ROOT_URLCONF = 'myblog.urls'

TEMPLATES = [
    {
        'BACKEND': 'django.template.backends.django.DjangoTemplates',
        'DIRS': [
            os.path.join(BASE_DIR, 'templates'),
        ],
        'APP_DIRS': True,
        'OPTIONS': {
            'context_processors': [
                'django.template.context_processors.debug',
                'django.template.context_processors.request',
                'django.contrib.auth.context_processors.auth',
                'django.contrib.messages.context_processors.messages',
            ],
        },
    },
]

WSGI_APPLICATION = 'myblog.wsgi.application'

# Database
# https://docs.djangoproject.com/en/2.1/ref/settings/#databases

DATABASES = {
    # 'default': {
    #     'ENGINE': 'django.db.backends.sqlite3',
    #     'NAME': os.path.join(BASE_DIR, 'db.sqlite3'),
    # }
    'default': {
        'ENGINE': 'django.db.backends.mysql',
        'NAME': 'myblogs',  # 要连接的数据库，连接前需要创建好
        'USER': 'root',  # 连接数据库的用户名
        'PASSWORD': 'felixwang',  # 连接数据库的密码
        'HOST': '127.0.0.1',  # 连接主机，默认本级
        'PORT': 3306  # 端口 默认3306
    }
}

# Password validation
# https://docs.djangoproject.com/en/2.1/ref/settings/#auth-password-validators

AUTH_PASSWORD_VALIDATORS = [
    {
        'NAME': 'django.contrib.auth.password_validation.UserAttributeSimilarityValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.MinimumLengthValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.CommonPasswordValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.NumericPasswordValidator',
    },
]

# Internationalization
# https://docs.djangoproject.com/en/2.1/topics/i18n/

# LANGUAGE_CODE = 'en-us'
# 语言
LANGUAGE_CODE = 'zh-hans'

# TIME_ZONE = 'UTC'
# 时区
TIME_ZONE = 'Asia/Shanghai'

USE_I18N = True

USE_L10N = True

# 不考虑时区
USE_TZ = False

# Static files (CSS, JavaScript, Images)
# https://docs.djangoproject.com/en/2.1/howto/static-files/

STATIC_URL = '/static/'
STATICFILES_DIRS = [
    os.path.join(BASE_DIR, "static")
]

# media
MEDIA_URL = '/media/'
MEDIA_ROOT = os.path.join(BASE_DIR, 'media')

# 配置ckeditor
CKEDITOR_UPLOAD_PATH = 'upload/'

# 自定义参数
EACH_PAGE_BLOGS_NUMBER = 7

# 设置数据库缓存
CACHES = {
    'default': {
        'BACKEND': 'django.core.cache.backends.db.DatabaseCache',
        'LOCATION': 'my_read_num_cache_table',
    }
}

# ckeditor 代码高亮,以及公式
CKEDITOR_CONFIGS = {
    'default': {
        'skin': 'moono',
        'tabSpaces': 4,
        'mathJaxLib': 'https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.5/MathJax.js?config=TeX-MML-AM_CHTML',
        'toolbar': (
            ['div', 'Source', '-', 'Save', 'NewPage', 'Preview', '-', 'Templates'],
            ['Cut', 'Copy', 'Paste', 'PasteText', 'PasteFromWord', '-', 'Print',
             'SpellChecker', 'Scayt'],
            ['Undo', 'Redo', '-', 'Find', 'Replace', '-', 'SelectAll', 'RemoveFormat',
             '-', 'Maximize', 'ShowBlocks', '-', "CodeSnippet", 'Mathjax', 'Subscript',
             'Superscript'],
            ['Form', 'Checkbox', 'Radio', 'TextField', 'Textarea', 'Select', 'Button',
             'ImageButton', 'HiddenField'],
            ['Bold', 'Italic', 'Underline', 'Strike', '-'],
            ['NumberedList', 'BulletedList', '-', 'Outdent', 'Indent', 'Blockquote'],
            ['JustifyLeft', 'JustifyCenter', 'JustifyRight', 'JustifyBlock'],
            ['Link', 'Unlink', 'Anchor'],
            ['Image', 'Flash', 'Table', 'HorizontalRule', 'Smiley', 'SpecialChar',
             'PageBreak'], ['Styles', 'Format', 'Font', 'FontSize'],
            ['TextColor', 'BGColor'],),
        'extraPlugins': ','.join([
            'codesnippet',
            'mathjax',
            'dialog',
            'dialogui',
            'lineutils',
        ]),
    },
    'comment_ckeditor': {
        'toolbar': 'custom',
        'toolbar_custom': [
            ['Bold', 'Italic', 'Underline', 'Strike', 'Subscript', 'Superscript'],
            ['TextColor', 'BGColor', 'RemoveFormat'],
            ['NumberedList', 'BulletedList'],
            ['Link', 'Unlink'],
            ['Smiley', 'SpecialChar', 'Blockquote'],
        ],
        'width': 'auto',
        'height': '180',
        'tabSpace': 4,
        'removePlugins': 'elementspath',
        'resize_enabled': False,
    }
}