我知道这个问题有很多答案,但我是Django的新手,我不知道如何实现这些解决方案。首先我想做什么。这是我的模特:
class Region(models.Model):
name = models.CharField(max_length=255, verbose_name=_("Name"))
slug = models.SlugField(max_length=150, unique=True, null=True)
def save(self,*args, **kwargs):
if not self.slug:
self.slug = slugify(self.name)
super(Region,self).save(*args,**kwargs)
def __unicode__(self):
return u'%s' % (self.name)
class Meta:
verbose_name = _('Region')
verbose_name_plural = _('Regions')
class District(models.Model):
name = models.CharField(max_length=255, verbose_name=_("Name"))
slug = models.SlugField(max_length=150, unique=True, null=True)
region = models.ForeignKey(Region,verbose_name=_("Region"))
def save(self, *args, **kwargs):
if not self.slug:
self.slug = slugify(self.name)
super(District, self).save(*args, **kwargs)
def is_in_region(self, region):
if self.region == region:
return True
else:
return False
def __unicode__(self):
return u'%s' % (self.name)
class Meta:
verbose_name = _("District")
verbose_name_plural = _("Districts")
在前端页面中,我想选择一个区域,选择区域将显示该区域的区域。我的意见如下:
class SearchView(ListView):
template_name = 'advert/list_view.html'
def all_json_models(self, request, region):
current_reg = Region.objects.get(slug=region)
districts = District.objects.all().filter(region=current_reg)
json_models = serializers.serialize("json", districts)
return http.HttpResponse(json_models, mimetype="application/javascript")
def get(self, request, *args, **kwargs):
return self.post(request, *args, **kwargs)
def post(self, request, *args, **kwargs):
self.request = request
try:
self.page = int(self.request.GET.get('page','1'))
except:
self.page = 1
self.queryset = ""
return super(SearchView, self).get(request, *args, **kwargs)
def get_queryset(self):
"""We have to bypass the queryset because
we are joining several object lists together. """
return None
def get_context_data(self, **kwargs):
context['regions'] = Region.objects.all().order_by("name")
return context
get_context_data方法要长得多,但我在这里只写了一个简单的方法。我在本网站使用此解决方案http://www.devinterface.com/blog/en/2011/02/how-to-implement-two-dropdowns-dependent-on-each-other-using-django-and-jquery/。但仍然选择与地区不起作用。我尝试在视图中将方法all_json_models写入此类,但仍然不调用此方法。在这里有谁能告诉我为什么?很多
答案 0 :(得分:15)
好吧,不要让我们看看代码
from django.db import models
class City(models.Model):
name = models.CharField(max_length=50)
country = models.ForeignKey("Country")
def __unicode__(self):
return u'%s' % (self.name)
class Country(models.Model):
name = models.CharField(max_length=50)
def __unicode__(self):
return u'%s' % (self.name)
views.py:
from django.shortcuts import render
from map.models import *
from django.utils import simplejson
from django.http import HttpResponse
def index(request):
countries = Country.objects.all()
print countries
return render(request, 'index.html', {'countries': countries})
def getdetails(request):
#country_name = request.POST['country_name']
country_name = request.GET['cnt']
print "ajax country_name ", country_name
result_set = []
all_cities = []
answer = str(country_name[1:-1])
selected_country = Country.objects.get(name=answer)
print "selected country name ", selected_country
all_cities = selected_country.city_set.all()
for city in all_cities:
print "city name", city.name
result_set.append({'name': city.name})
return HttpResponse(simplejson.dumps(result_set), mimetype='application/json', content_type='application/json')
index.html:
<html>
<head>
<script type="text/javascript" src="http://code.jquery.com/jquery-latest.min.js"></script>
<script type="text/javascript" src="http://yourjavascript.com/7174319415/script.js"></script>
<script>
$(document).ready(function(){
$('select#selectcountries').change(function () {
var optionSelected = $(this).find("option:selected");
var valueSelected = optionSelected.val();
var country_name = optionSelected.text();
data = {'cnt' : country_name };
ajax('/getdetails',data,function(result){
console.log(result);
$("#selectcities option").remove();
for (var i = result.length - 1; i >= 0; i--) {
$("#selectcities").append('<option>'+ result[i].name +'</option>');
};
});
});
});
</script>
</head>
<body>
<select name="selectcountries" id="selectcountries">
{% for item in countries %}
<option val="{{ item.name }}"> {{ item.name }} </option>
{% endfor %}
</select>
<select name ="selectcities" id="selectcities">
</select>
</body>
</html>
答案 1 :(得分:1)
我厌倦了这种非DRY解决方案,所以我写了一些可能足够灵活的东西用于大多数用例:
现在它只处理在线/ AJAX相关的选择框。我最终计划(可能在本周或下一周)添加一个离线模式,该模式使用小部件推送一些渲染的JS来跟踪父级的onchange事件,并通过值映射将其转换为子选项 - &gt;列表(选择)。 AJAX解决方案非常适合汽车制造/模型(1000种选择),而离线解决方案非常适合产品/颜色(可能有10种选择)。
答案 2 :(得分:0)
您可以使用链接的Jquery插件。
实施例: http://codepen.io/anon/pen/EapNPo?editors=101
<强> HTML 强>
<select id="id_country" name="country">
<option value="" selected="selected">---------</option>
<option value="1">Colombia</option>
<option value="2">Rusia</option>
</select>
<select id="id_city" name="city">
<option value="" selected="selected">---------</option>
<option value="1" class="1">Bogotá</option>
<option value="2" class="2">Moscú</option>
<option value="3" class="2">San Petersburgo</option>
<option value="4" class="1">Valledupar</option>
</select>
<强> JS 强>
$("#id_city").chained("#id_country");
使用模型生成表单(ForeignKey)
转到https://axiacore.com/blog/django-y-selects-encadenados/完整教程
答案 3 :(得分:0)
此处提供了有关AJAX代码的更新答案,以及为清晰起见添加了一些补充内容。在下面,只需将#selectyear
更改为您的选择ID,然后将变量schedule_year
重命名为对您的数据有意义的名称。然后将#selectschedule
成功更改为第二个选择ID的名称。请注意,result[i].schedule_name
对应于从视图传回的值的名称。请查看views.py result_set
,并相应地更改数据名称。
如果您要实现两个以上的链式选择,这很简单。只需复制下面的代码即可将每个序列链接在一起,以获得所需的尽可能多的关系。重复使用带有条件语句的同一视图,或仅添加另一个返回新结果的视图。
javascript和AJAX
<script>
$(document).ready(function(){
//handle selected year
$('select#selectyear').change(function () {
var optionSelected = $(this).find("option:selected");
var valueSelected = optionSelected.val();
var schedule_year = optionSelected.text();
$.ajax({
url: 'getdetails/',
type: 'GET',
data: {'year' : JSON.stringify(schedule_year)},
success: function(result){
//remove previous selections
$("#selectschedule option").remove();
//add a blank option
$("#selectschedule").append('<option></option>');
//append new options returned
for (var i = result.length - 1; i >= 0; i--) {
$("#selectschedule").append('<option>'+ result[i].schedule_name +'</option>');
};
},
});
});
});
</script>
HTML
<table width="100%" class="table">
<tr>
<td class="align-middle" style="width: 50%;">
<label for="#selectyear" value="calendar_year" style="width:100%">
<span class="small pl-1">Select Calendar Year</span>
<select class="form-control" name="selectyear" id="selectyear">
<option value="blank"></option>
{% for schedule in schedules|dictsort:'fee_schedule_calendar_year' %}
{% ifchanged %}<!--used to only show unique values-->
<option value="{{ schedule.fee_schedule_calendar_year }}">{{ schedule.fee_schedule_calendar_year }}</option>
{% endifchanged %}
{% endfor %}
</select>
</label>
</td>
<td class="align-middle" style="width: 50%;">
<label for="#selectschedule" value="fee_schedule" style="width: 100%;">
<span class="small pl-1">Select Fee Schedule</span>
<select class="form-control" name="selectschedule" id="selectschedule"></select>
</label>
</td>
</tr>
</table>
Views.py
# Handle AJAX request for fee schedule calendar year select
def getdetails(request, file_upload_id, file_header_id):
schedule_year = json.loads(request.GET.get('year'))
result_set = []
schedules = FeeSchedule.objects.filter(fee_schedule_calendar_year=schedule_year)
for schedule in schedules:
result_set.append({'schedule_name': schedule.fee_schedule_name})
return HttpResponse(json.dumps(result_set, indent=4, sort_keys=True, default=str), content_type='application/json')
urls.py
path('whatever_your_current_path_is_for_this_view/getdetails/', login_required(views.getdetails), name='get_details'),