Requirement:
There is a simple form that has two input field, one is zip code and another is city. If the zip code is filled, the page will fill the city automatically by getting the relevant city of the zip code in an AJAX way.

Implementation:
1. django-admin.py startproject study
2. cd study
3. python manage.py startapp ajax
4. Edit settings.py, add 'study.ajax' to INSTALLED_APPS.
5. mkdir site_media
6. Download jquery.js from www.jquery.com and copy it to site_media
7. Add the following line to urls.py:
(r'^site_media/(?P<path>.*)$',?'django.views.static.serve',?{'document_root':'/home/sting/Django/study/site_media'}),
? Note: We will include jquery.js in our html, for this kind of static files, django's handling is different from others. Please see http://www.djangoproject.com/documentation/static_files/ to get more detailed information.
8. cd ajax
9. mkdir templates
? Note: This folder is used to put template files. It seems that django can load template files from this folder automatically, so you needn't to configure it in settings.py.
10. Create the following html file named form.html.
<!DOCTYPE?HTML?PUBLIC?"-//W3C//DTD?HTML?4.01//EN"?"http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<title>Register?form</title>
<script?src="http://localhost:8000/site_media/jquery.js"?type="text/javascript"></script>
<script?type="text/javascript">
??function?getZipData()?{
????var?zipcode?=?$('#zip').val();
????$.get('http://localhost:8000/ajax/getzipdata/'?+?zipcode?+?'/',?function(data)?{
??????$('#city').attr({'value':data});
????});
??}
</script>
</head>
<body>
<table>
<form?actioon=""?method="post">
<tr><td>Zip:</td><td><input?id="zip"?onblur="getZipData()"?type="text"?name="zip"/></tr>
<tr><td>City:</td><td><input?id="city"?type="text"?name="city"/></tr>
</form>
</table>
</body>
</html>
11. Edit views.py and add the following methods.
from?django.http?import?HttpResponse
from?django.core?import?serializers
from?django.shortcuts?import?render_to_response

def?getzipdata(request,?zipcode):
??if?zipcode?==?'214028':
????city?=?'wuxi'
??else:
????city?=?''

??return?HttpResponse(city)

def?register(request):
??return?render_to_response('form.html',?{})
12. Add the following lines to urls.py.
(r'^ajax/register/$',?'study.ajax.views.register'),
(r'^ajax/getzipdata/(\d+)/$',?'study.ajax.views.getzipdata'),

Visit http://localhost:8000/ajax/register/, you will see the simple form, after fill the zip code and move to city, the city will be filled automatically.

Blogged with Flock

Tags: , , ,