如何使用 Modelform 和 jquery 在 django 中获取相互依赖的下拉列表?

本文介绍了如何使用 Modelform 和 jquery 在 django 中获取相互依赖的下拉列表?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我是 django 和 jquery 的新手.我正在开发一个基于 django 的应用程序，其中有 3 个下拉列表.1.校园2. 学校3. 中心

I am new to django and jquery. I am working on a django-based app where I have 3 drop downs in a form. 1. Campus 2. School 3. Centre

层次结构是校园有学校，学校有中心.我想链接这些下拉菜单.

The hierarchy is Campuses have schools and schools have centres. I want to interlink these drop-downs.

例如，我有 3 个校区，比如 Campus1、Campus2、Campus3.如果我选择 Campus1，我应该只能选择 Campus1 中的学校并继续此操作，如果我选择 School1，那么我需要能够选择 School1 的中心，并且所有其他选项都应该隐藏.

For example, I have got 3 campuses, say Campus1, Campus2, Campus3. If I select Campus1, I should only get to select schools in campus1 and continuing this, if I select School1 then I need to be able to select centres of School1 and all other options should get hidden.

我在网上搜索并尝试了这个 http://blog.devinterface.com/2011/02/how-to-implement-two-dropdowns-dependent-on-other-using-django-and-jquery/但它似乎对我不起作用.我也检查了这个 http://www.javascriptkit.com/script/script2/triplecombo.shtml但由于我使用 ModelForm 创建表单，这不符合我的需要.

I searched on net and have tried this http://blog.devinterface.com/2011/02/how-to-implement-two-dropdowns-dependent-on-each-other-using-django-and-jquery/but it doesn't seem to work for me.I have also checked this http://www.javascriptkit.com/script/script2/triplecombo.shtmlbut since I am using ModelForm to create forms, this doesn't fit to my needs.

请指导我这样做.

谢谢

Forms.py

import models
from django import forms

class CenterForm(forms.ModelForm):
    campus = forms.ModelChoiceField(queryset=models.Campus.objects.all())
    school = forms.ModelChoiceField(queryset=models.School.objects.none()) # Need to populate this using jquery
    centre = forms.ModelChoiceField(queryset=models.Centre.objects.none()) # Need to populate this using jquery

    class Meta:
        model = models.Center

        fields = ('campus', 'school', 'centre')

现在，在您的视图中编写一个方法，为校园下的学校和学校下的中心返回一个 json 对象:

Now, write a method in your views that returns a json object for schools under a campus and centres under a school:

import models
import simplejson
from django.http import HttpResponse

def get_schools(request, campus_id):
    campus = models.Campus.objects.get(pk=campus_id)
    schools = models.School.objects.filter(campus=campus)
    school_dict = {}
    for school in schools:
        school_dict[school.id] = school.name
    return HttpResponse(simplejson.dumps(school_dict), mimetype="application/json")

def get_centres(request, school_id):
    school = models.School.objects.get(pk=school_id)
    centres = models.Centre.objects.filter(school=school)
    centre_dict = {}
    for centre in centres:
        centre_dict[centre.id] = centre.name
    return HttpResponse(simplejson.dumps(centre_dict), mimetype="application/json")

现在编写一个 ajax/jquery 方法来获取数据并填充 HTML 中的 select 元素.

Now write a ajax/jquery method to fetch the data and populate the select elements in the HTML.

$(document).ready(function(){
    $('select[name=campus]').change(function(){
        campus_id = $(this).val();
        request_url = '/get_schools/' + campus_id + '/';
        $.ajax({
            url: request_url,
            success: function(data){
                $.each(data, function(index, text){
                    $('select[name=school]').append(
                         $('<option></option>').val(index).html(text)
                     );
                });
            }
        });
        return false;
    })
});

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