【python】组合搜索

实现原理

　　通过url地址拼接，0-0-0，三个0分别代表一个搜索条件，再用reverse反向查找三个参数，从kwargs里调用值，在自定义函数中自定义url,并生成动态添加的a标签。

效果图

url

from django.conf.urls import url
from django.contrib import admin
from app010 import views
urlpatterns = [
    url(r'^admin/', admin.site.urls),
    url(r'^video-(?P<d_to_c_id>d+)-(?P<cg_id>d+)-(?P<lv_id>d+).html',views.new_video,name="www"),
]

models

from django.db import models

# Create your models here.

class Level(models.Model):
    name = models.CharField(max_length=32)

class Category(models.Model):
    name = models.CharField(max_length=32)

class Direction(models.Model):
    name = models.CharField(max_length=32)
    dire_to_cate = models.ManyToManyField("Category")

class Video(models.Model):
    lv = models.ForeignKey(Level)
    cg = models.ForeignKey(Category)

    title = models.CharField(verbose_name='标题', max_length=32)
    summary = models.CharField(verbose_name='简介', max_length=32)
    img = models.ImageField(verbose_name='图片', upload_to='./static/images/Video/')
    href = models.CharField(verbose_name='视频地址', max_length=256)

    create_date = models.DateTimeField(auto_now_add=True)

views

from django.shortcuts import render

# Create your views here.
from app010 import models

def new_video(request,*args,**kwargs):
    d_to_c_id = kwargs.get("d_to_c_id")
    cg_id = kwargs.get("cg_id")
    lv_id = kwargs.get("lv_id")
    conditions = {}
    dire_to_cate_list = models.Direction.objects.all()
    level_list = models.Level.objects.all()
    if d_to_c_id == "0":
        #未选择方向
        category_list = models.Category.objects.all()
        if cg_id == "0":
            #未选择分类
            pass
        else:
            #选择分类
            conditions["cg_id"] = cg_id
    else:
        #选择了方向
        category_list = models.Category.objects.filter(direction=d_to_c_id)
        temp = category_list.values_list("id")
        cg_id_list = list(zip(*temp))[0]
        if cg_id == "0":
            #未选择分类
            conditions["cg_id__in"] = cg_id_list
        else:
            #选择了分类
            if int(cg_id) in cg_id_list:
                conditions["cg_id"] = cg_id
            else:
                conditions["cg_id__in"] = cg_id_list
                kwargs["cg_id"] = "0"
    if lv_id == "0":
        pass
    else:
        conditions["lv_id"] = lv_id

    result = models.Video.objects.filter(**conditions)
    return render(request,"new_video.html",{"dire_to_cate_list":dire_to_cate_list,
                                            "category_list": category_list,
                                            "level_list":level_list,
                                            "arg_list": kwargs,
                                            "result": result,
                                            })

tags(自定义函数)

#!/usr/bin/env python
# coding:utf-8
#author:zhangw
from django.utils.safestring import mark_safe
from django import template

register = template.Library()

@register.simple_tag
def category_tag(obj,arg_dict):
    from django.urls import reverse


    url = reverse("www", kwargs={"cg_id": obj.id, "lv_id": arg_dict.get("lv_id"),"d_to_c_id":arg_dict.get("d_to_c_id")})

    if str(obj.id) == arg_dict.get("cg_id"):
        tag = "<a class='active' href='%s'>%s</a>" %(url,obj.name)
        return mark_safe(tag)
    else:
        tag = "<a href='%s'>%s</a>" %(url,obj.name)
        return mark_safe(tag)
@register.simple_tag
def level_tag(obj,arg_dict):
    from django.urls import reverse

    url = reverse("www", kwargs={"cg_id": arg_dict.get("cg_id"), "lv_id": obj.id,"d_to_c_id":arg_dict.get("d_to_c_id")})

    if str(obj.id) == arg_dict.get("lv_id"):
        tag = "<a class='active' href='%s'>%s</a>" %(url,obj.name)
        return mark_safe(tag)
    else:
        tag = "<a href='%s'>%s</a>" %(url,obj.name)
        return mark_safe(tag)

@register.simple_tag
def total_tag(arg_dict,key):
    from django.urls import reverse
    if key == "cg_id":
        url = reverse("www",kwargs={"cg_id":0,"lv_id":arg_dict.get("lv_id"),"d_to_c_id":arg_dict.get("d_to_c_id")})
    elif key == "lv_id":
        url = reverse("www",kwargs={"cg_id":arg_dict.get("cg_id"),"lv_id":0,"d_to_c_id":arg_dict.get("d_to_c_id")})
    elif key == "d_to_c_id":
        url = reverse("www",kwargs={"cg_id":arg_dict.get("cg_id"),"lv_id":arg_dict.get("lv_id"),"d_to_c_id":0})
    else:
        url = ""
    if arg_dict.get(key) == "0":
        tag = "<a class='active' href='%s'>全部</a>" % (url,)
    else:
        tag = "<a href='%s'>全部</a>" %(url,)
    return mark_safe(tag)


@register.simple_tag
def direction_tag(obj,arg_dict):
    from django.urls import reverse
    url = reverse("www",kwargs={"d_to_c_id":obj.id,"cg_id":arg_dict.get("cg_id"),"lv_id":arg_dict.get("lv_id")})

    if str(obj.id) == arg_dict.get("d_to_c_id"):
        tag = "<a class='active' href='%s'>%s</a>" %(url,obj.name)
        return mark_safe(tag)
    else:
        tag = "<a href='%s'>%s</a>" %(url,obj.name)
        return mark_safe(tag)

前端HTML

{% load tags %}
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        * {
            margin-left: 20px;
        }

        .filter a {
            margin-left: 20px;
            text-decoration: none;
        }

        .filter a.active {
            color: red;
        }

    </style>
</head>
<body>
<div class="filter">
    <h1 style="margin-left: 20px">搜索条件</h1>
    <div>
        {% total_tag arg_list "d_to_c_id" %}
        {% for i in dire_to_cate_list %}
            {% direction_tag i arg_list %}
        {% endfor %}
    </div>
    <div>
        {% total_tag arg_list "cg_id" %}
        {% for i in category_list %}
            {% category_tag i arg_list %}
        {% endfor %}
    </div>
    <div>
        {% total_tag arg_list "lv_id" %}
        {% for i in level_list %}
            {% level_tag i arg_list %}
        {% endfor %}
    </div>
</div>


<h1 style="margin-left: 20px">查询结果</h1>
<div class="content">
    {% for row  in result %}
        <div style=" 100px;height: 220px;float: left">
            <img src="{{ row.img }}" style=" 100px;height: 150px;">
            <p style="background-color: aqua">{{ row.title }}</p>
            <p style="background-color: cadetblue">{{ row.summary }}</p>
        </div>
    {% endfor %}
</div>
</body>
</html>