| 1, Implementation method |
1. Pure template language implementation
2. Implementation of custom simpletag (in essence, it simplifies the judgment of pure template language)
| 2, Fundamentals |
The principle is to match the url filter conditions through django routing system, take the filter conditions as the database query results, and return them to the front end.
For example, the url format in the routing system is as follows:
url(r'^article-(?P<article_type_id>\d+)-(?P<category_id>\d+).html',views.filter)
The article ﹐ type ﹐ ID and category ﹐ ID correspond to the fields in the database. When a url is article-1-2.html, the parameters of the background processing function will be a dictionary {'article ﹐ type ﹐ ID': 1, 'category ﹐ ID': 1}. Then the condition will be used as the database query condition, and the result will be returned to the front end
| 3, Code example |
Method 1: pure template language implementation
urls.py
#!/usr/bin/env python3 #_*_ coding:utf-8 _*_ #Author:wd from django.conf.urls import url from . import views urlpatterns = [ url(r'^$',views.index), url(r'^article-(?P<article_type_id>\d+)-(?P<category_id>\d+).html',views.filter), ]
models.py
from django.db import models class Category(models.Model): caption=models.CharField(max_length=64) class Article_type(models.Model): caption=models.CharField(max_length=64) class Article(models.Model): title=models.CharField(max_length=64) content=models.CharField(max_length=256) category=models.ForeignKey(to='Category') article_type=models.ForeignKey(to='Article_type'
views.py
def filter(request,*args,**kwargs): if request.method=="GET": condition={} for k,v in kwargs.items(): kwargs[k]=int(v) #Template if judge row.id It's a number, so it needs to be converted here if v=="0":#When the condition is 0, it means all is selected, then it is unnecessary to add it to the filter condition pass else: condition[k]=int(v) aritcle=models.Article.objects.filter(**condition) aritcle_type=models.Article_type.objects.all() aritcle_category=models.Category.objects.all() return render(request,'search.html',{ 'aritcle':aritcle, 'article_type':aritcle_type, 'article_category':aritcle_category, 'article_arg':kwargs,#Pass the current filter criteria to html })
html template
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> <style> .container a{ display: inline-block; padding: 3px 5px; margin: 5px; border: 1px solid #dddddd ; } .active{ background-color: rebeccapurple; } </style> </head> <body> <h1>search criteria</h1> <div class="container"> {% if article_arg.article_type_id == 0 %} <a class="active" href="/cmdb/article-0-{{ article_arg.category_id }}.html">whole</a> {% else %} <a href="/cmdb/article-0-{{ article_arg.category_id }}.html">whole</a> {% endif %} {% for row in article_type %} {% if row.id == article_arg.article_type_id %} <a class="active" href="/cmdb/article-{{ row.id }}-{{ article_arg.category_id }}.html">{{ row.caption }}</a> {% else %} <a href="/cmdb/article-{{ row.id }}-{{ article_arg.category_id }}.html">{{ row.caption }}</a> {% endif %} {% endfor %} </div> <div class="container"> {% if article_arg.category_id == 0 %} <a class="active" href="/cmdb/article-{{ article_arg.article_type_id }}-0.html">whole</a> {% else %} <a href="/cmdb/article-{{ article_arg.article_type_id }}-0.html">whole</a> {% endif %} {% for row in article_category %} {% if row.id == article_arg.category_id %} <a class="active" href="/cmdb/article-{{ article_arg.article_type_id }}-{{ row.id }}.html">{{ row.caption }}</a> {% else %} <a href="/cmdb/article-{{ article_arg.article_type_id }}-{{ row.id }}.html">{{ row.caption }}</a> {% endif %} {% endfor %} </div> <h1>Query results</h1> <div> {% for row in aritcle %} <div>{{ row.id }}-{{ row.title }}</div> {% endfor %} </div> </body> </html>