小结
页面的路由
内容都是随机出来的
省份的外键值为空
其它情况一样
class City(models.Model):
name = models.CharField(verbose_name="地名", max_length=20)
pid = models.ForeignKey("self", on_delete=models.CASCADE, default=None, null=True)
》发一个ajax请求，拿省级的内容
》路由
》视图
# 查询全部省份
def province(request):
all_province = models.City.objects.filter(pid__isnull=True)
province_info_list = [(province.id, province.name) for province in all_province]
return JsonResponse(province_info_list)
》先完成基本功能，让jquery生效
<!doctype html>
<html lang="en">
<head>
{% load static %}
<meta charset="UTF-8">
<meta name="viewport"
content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>test_linkage</title>
<script src="{% get_static_prefix %}js/jquery-1.12.4.min.js"></script>
<script>
$(main);
function main() {
alert(111);
}
</script>
</head>
<body>
<select name="province" id="">
<option value="">--省份--</option>
</select>
<select name="city" id="">
<option value="">--城市--</option>
</select>
<select name="area" id="">
<option value="">--区域--</option>
</select>
</body>
</html>
能够弹出东西，就OK
》要发起一个请求
