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Version 5 (modified by erob@…, 7 years ago) (diff)

fast! push the client side!

Here's a simple recipe that worked for me. It is quite inspired by the AjaxDojoFormSub example―and from this tutorial―except that this recipe is expected to use python-cjson for receiving JSON data.

My initial objective was to display validation errors without doing a page-refresh, by using JSON for carrying errors (or whatever else you could possibly imagine) back to the client browser.

First thing first, lets write the server view, as its really important to make the forms working without the use of Javascript:

import cjson
from django.http import HttpResponse
from django.template import loader, Context

def register(request):
    # Register or reports any (new)form-validation errors using JSON.
    form = ExampleForm(request.POST)
    t = loader.get_template('myform.html')
    if not form.is_valid():
       # Return JSON object containing the errors object.
       if xhr:
          return HttpResponse(cjson.encode(form.errors), mimetype='text/javascript')
       else:
          # vanilla Http response fallback
          return HttpResponse(t.render(Context({'errors' : form.errors }))
    else:
       # Do something when the form has been validated.
       ...    

We could try to arrange the client code to fit into one, unportable template chunk, however it's usually best to split the work in smaller pieces, at least for being nice to the maintainers (You). :-)

So let's move on in writing our own Dojo template, where we will make an abstraction of all our applied Dojo concepts:

[dojo template here...]

Then let's push forward and write down the core JS file, for doing AJAX-related things:

[ajax-related things here...]

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