Redis记录历史表单数据，之后读取填充选择表单

# Redis记录历史表单数据，之后读取填充选择表单 需求，在创建博客时，对于表单中的选择框每次都需要重新选，如果是发布同一类型的文章，分类、专题、标签都是一样，那么如何记录上次该浏览器的选择呢？  1. 创建博客时将浏览器选择的历史记录在Redis中； 2. 视图中尝试读取该值，并在前端selected选中。 ## 新建博客视图 创建验证`form_valid(self, form)`成功后将选择项保存到redis数据库中，并设置过期时间为12小时 对于多选框，需要将结果值转换为以`_`连接的字符串，`'_'.join(map(lambda tag: str(tag.id), form.cleaned_data.get('tags')))` 存储到Redis中。 当再次创建时，获取Redis中的值，对于多选，需要字符串分解了int型的列表`select_tags = list(int(tag_id) for tag_id in last_select_tags.split('_'))` 前端`option`中通过`tag.id in select_tags`判断是否是选中状态。 ```python # 文章创建 @method_decorator(login_required, name='dispatch') class BlogCreate(CreateView): model = Article template_name = 'rearend/blog-edit.html' form_class = ArticleForm from utils.project_config import get_redis_db redis_db = get_redis_db() # success_url = 'xxx' # 可以设置创建成功后跳转地址，也可以使用下面的函数 def get_success_url(self): # print(self.object.id) # 可以得到新创建的博客id # return reverse('blog:blog_list') return reverse('blog_admin:blog_detail', kwargs={'article_id': self.object.id}) # 表单验证通过，修改一些字段的值 def form_valid(self, form): if self.request.user: form.instance.author = self.request.user from django.contrib.auth.models import Group # 如果用户在已注册的组中，当发布了一篇文章后，将用户移动到作者的组（id=4）中 if self.request.user in Group.objects.get(id=5).user_set.all(): Group.objects.get(id=5).user_set.remove(self.request.user) Group.objects.get(id=4).user_set.add(self.request.user) # 博客创建保留上次创建的记录在表单中 csrftoken = self.request.COOKIES.get('csrftoken', None) if csrftoken: # 保存记录到redis self.redis_db.set('{}:create:article:select:category'.format(csrftoken), form.cleaned_data.get('category').id, ex=43200) # 12小时过期 select_feature = form.cleaned_data.get('feature').id if form.cleaned_data.get('feature') else 0 self.redis_db.set('{}:create:article:select:feature'.format(csrftoken), select_feature, ex=43200) self.redis_db.set('{}:create:article:select:tags'.format(csrftoken), '_'.join(map(lambda tag: str(tag.id), form.cleaned_data.get('tags'))), ex=43200) # 转为"1_3_5"字符串 return super(BlogCreate, self).form_valid(form) def get_context_data(self, **kwargs): context = super(BlogCreate, self).get_context_data(**kwargs) context['status_choices'] = list(map(lambda x: {'status_code': x[0], 'status_value': x[1]}, Article.STATUS_CHOICES)) context['categories'] = Category.objects.all() context['features'] = Feature.objects.all() context['tags'] = Tag.objects.all() context['select_category'] = context['select_feature'] = '' context['select_tags'] = [] if self.request.path == reverse('blog_admin:blog_create'): csrftoken = self.request.COOKIES.get('csrftoken', None) last_select_category = self.redis_db.get('{}:create:article:select:category'.format(csrftoken)) last_select_feature = self.redis_db.get('{}:create:article:select:feature'.format(csrftoken)) last_select_tags = self.redis_db.get('{}:create:article:select:tags'.format(csrftoken)) # print(last_select_tags.split('_')) if last_select_category and last_select_feature and last_select_tags: context['select_category'] = int(last_select_category) context['select_feature'] = int(last_select_feature) context['select_tags'] = list(int(tag_id) for tag_id in last_select_tags.split('_')) # 只能用int类型 return context ``` ## 创建表单前端模板 ```html <div class="form-group"> <label for="{{ form.category.id_for_label }}">{{ form.category.label_tag }}</label> <select class="form-control select2" name="category" id="{{ form.category.id_for_label }}" style="width: 100%"> {% for category in categories %} <option value="{{ category.id }}" {% if form.category.value == category.id or category.id == select_category %} selected {% endif %} style="height: 30px">{{ category.name }}</option> {% endfor %} </select> </div> <div class="form-group"> <label for="{{ form.feature.id_for_label }}">{{ form.feature.label_tag }}</label> <select class="form-control select2" name="feature" id="{{ form.feature.id_for_label }}" style="width: 100%"> <option value="" {% if not form.feature.value %} selected {% endif %} style="height: 30px">---------------</option> {% for feature in features %} <option value="{{ feature.id }}" {% if form.feature.value == feature.id or feature.id == select_feature %} selected {% endif %} style="height: 30px">{{ feature.name }}</option> {% endfor %} </select> </div> <div class="form-group"> <label for="{{ form.tags.id_for_label }}">{{ form.tags.label_tag }}</label> <select class="select2 select2-hidden-accessible" name="tags" id="{{ form.tags.id_for_label }}" multiple="" data-placeholder="可选择多个标签" aria-hidden="true" style="width: 100%;"> {% for tag in tags %} <option value="{{ tag.id }}" {% if tag.id in form.tags.value or tag.id in select_tags %} selected {% endif %}>{{ tag.name }}</option> {% endfor %} </select> </div> ```

明人不说暗话 领红包就是支持！！！ 来都来了，再到页面底部看下呗~ ↓ ↓ ↓

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