Django动态形式 - 即时野外人口？ [英] Django dynamic forms - on-the-fly field population?
问题描述
我一直在扫描Django文档和Google搜索结果，所有的下午，我仍然有点困扰我尝试创建一个动态表单。我希望我只需要一个人来推动我正确的方向:-)我刚刚开始学习Django，所以我还是一个初学者，然而，我已经是一个中间的python用户。
I've been scanning through Django documentation, and Google search results, all afternoon and I'm still somewhat stuck in my attempt to create a dynamic form. I'm hoping I just need someone to nudge me in the right direction :-) I'm just starting to learn Django, so I'm still very much a beginner; however, I'm already an intermediate python user.
我想要做的是创建一个动态表单，用户从下拉列表中进行选择菜单，并且基于该选择，表单的另一部分将自动更新以显示与当前选择的项目相关的结果，但是从另一个数据库表。
What I'm trying to do is create a dynamic form, where the user makes a selection from a drop-down menu, and based on that selection another part of the form will automatically update to display results relevant to the currently selected item, but from another database table.
我会尝试并使用Django教程中的简化版模型来更好地说明我正在做的事情：
I'll try and use a simplified version of the models from the Django tutorial to better illustrate what I'm trying to do:
# models.py
from django.db import models
class Poll(models.Model):
question = models.CharField(max_length=200)
class Choice(models.Model):
poll = models.ForeignKey(Poll)
choice = models.CharField(max_length=200)
所以我想说，我想要一个类似下拉选择字段的东西，填充数据库中每个投票的问题。我还想有一个文本字段，显示当前选定的轮询的相应选择，当用户选择不同的池时，它将随时更新。我已经能够通过放置一个按钮，并将信息发布回表单来计算出来;但是，我试图在用户进行选择时自动执行此操作。我现在看起来像这样：
So lets say I want to have something like a drop-down selection field, populated with the question from each Poll in the database. I also want to have a text-field, which displays the corresponding choices for the currently selected Poll, which will update on-the-fly whenever the user selects a different Pool. I've been able to figure this out by placing a button, and posting information back to the form; However, I'm trying to do this automatically as the user makes a selection. My view sort of looks something like this at the moment:
#view.py
from django import forms
from django.shortcuts import render_to_response
from myapp.models import Poll,Choice
class MyModelChoiceField(forms.ModelChoiceField):
def label_from_instance(self, obj):
return "%s" % obj.question
class PollSelectionForm(forms.Form):
polls = MyModelChoiceField( queryset=Poll.objects.all() )
class ChoiceResults(forms.Form):
def __init__(self, newid, *args, **kwargs):
super(ChoiceResults, self).__init__(*args, **kwargs)
self.fields['choice'] = forms.TextField( initial="" )
def main(request):
return render_to_response("myapp/index.html", {
"object": PollSelectionForm(),
"object2": ChoiceResults(),
})
我的模板很简单，就像
{{ object }}
{{ object2 }}
我确定我打算创建表单的方式可能不是最好的，所以也可以自由地批评:-)正如我所提到的，我已经阅读了解决方案涉及到转发形式，但是我想要这样做即时发生，如果我可以透明地转发，那将是罚款我猜。我也看过可以让你动态创建表单的图书馆，但这似乎是过分的。
I'm sure the way I'm going about creating the forms is probably not the best either, so feel free to criticize that as well :-) As I mentioned, I've read solutions involving reposting the form, but I want this to happen on-the-fly... if I can repost transparently then that would be fine I guess. I've also seen libraries that will let you dynamically create forms, but that just seems like overkill.
推荐答案
这是一种方法 - Django / jQuery级联选择框？
Here is one approach - Django/jQuery Cascading Select Boxes?
您可以创建一个新的视图，只需将json呈现为一个字符串
，然后当您从第一个列表中完成选择时触发事件，该列表从该json动态加载数据。
You can create a new view that just renders json to a string, and then trigger an event when you're done selecting from the first list which loads the data dynamically from that json.
这篇关于Django动态形式 - 即时野外人口？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
