Django Forms

Introduction to Django Forms for Django Girls × Taipei.py workshop.

Transcript

1. Django Forms
2. Django Forms • Forms? • Forms! • Model forms
3. Web Page
4. Web Page with Form submit
5. <form action="/path/to/send" method="POST" enctype="multipart/form-data"> <!-- form content --> <input type="submit"> </form>
7. <form action="/path/to/send" method="post" enctype="multipart/form-data"> • Where to send • URL • Default: "" (current URL)
8. <form action="/path/to/send" method="post" enctype="multipart/form-data"> • How to send • Either get or post • Get: postcard • Post: Enveloped • Default: get
9. <form action="/path/to/send" method="post" enctype="multipart/form-data"> • How to read • application/x-www-form-urlencoded • Default • multipart/form-data • Form contains file
10. GET Submission Query string
11. POST Submission "GET /admin/ HTTP/1.1" 302 0 "GET /admin/login/?next=/admin/ HTTP/1.1" 200 1679 "POST /admin/login/?next=/admin/ HTTP/1.1" 302 0 "GET /admin/ HTTP/1.1" 200 3407
12. <form action="/path/to/send" method="POST" enctype="multipart/form-data"> <!-- form content --> <input type="submit"> </form>
13. <input type="submit"> <button type="submit"> Submit </button>
14. <input type="submit"> <button type="submit"> Submit </button>
15. <form action="/path/to/send" method="POST" enctype="multipart/form-data"> <!-- form content --> <input type="submit"> </form>
16. Django Forms!
17. Models Database Django forms HTML forms
18. from django import forms class MessageForm(forms.Form): name = forms.CharField( max_length=100, ) title = forms.CharField( max_length=100, required=False, ) content = forms.CharField( widget=forms.Textarea, )
19. from .forms import MessageForm def message_board(request): form = MessageForm() return render( request, 'message_board.html', {'form': form}, )
20. <form method="post"> {% csrf_token %} {{ form.as_p }} <button>ૹग़</button> </form>
21. <form method="post"> {% csrf_token %} {{ form.as_p }} <button>ૹग़</button> </form> ?
22. CSRF Token • Cross Site Request Forgery protection • “Recognise” whether a form is legit • Protect the server from malicious changes
25. class Message(models.Model): name = models.CharField( max_length=100, ) title = models.CharField( max_length=100, blank=True, ) content = models.TextField() created_at = models.DateTimeField( auto_now_add=True, )
26. class Message(models.Model): name = models.CharField( max_length=100, ) title = models.CharField( max_length=100, blank=True, ) content = models.TextField() created_at = models.DateTimeField( auto_now_add=True, )
27. class MessageForm(forms.Form): # ... def save(self): data = self.cleaned_data message = Message( name=data['name'], title=data['title'], content=data['content'], ) message.save() return message
28. class MessageForm(forms.Form): # ... def save(self): data = self.cleaned_data message = Message( name=data['name'], title=data['title'], content=data['content'], ) message.save() return message
29. def message_board(request): if request.method == 'POST': form = MessageForm(request.POST) if form.is_valid(): form.save() else: form = MessageForm() return render( request, 'message_board.html', {'form': form}, )
30. Further Reading • Model forms • Form factories • Custom “cleaning”
31. Exercises • Implement message form • Implement message model, save POST-ed form to it • Get messages from database • Display messages in template
32. Hint {% for m in messages %} <div class="message"> <p>{{ m.name }}</p> <h5>{{ m.title }}</h5> <div>{{ m.content|linebreaks }}</div> </div> {% endfor %} Message.obejcts.order_by('-created_at')