Having difficulty invoking the ajax/dajax function

Currently, I am in the process of developing a Django application where users should be able to initiate a partial page change by clicking a button. The challenge lies in passing data from the server to the web page without necessitating a complete page refresh, which seems tailor-made for Ajax. However, despite several attempts, I have been unable to get Ajax to function correctly within my application.

The main issue I am facing is getting the call to trigger my server-side function. Specifically, the code pertains to retrieving missed calls, with the goal of showcasing them to the user without requiring a full-page reload.

Whenever I click the button, I encounter a pop-up message stating "Something goes wrong." After inspecting the error using Firebug, it appears that there is a DAJAXICE_EXCEPTION, but unfortunately, I lack further details regarding this problem.

Can anyone shed some light on what might be causing this issue? How can I troubleshoot and resolve it effectively? Moreover, if there exists a simpler method to achieve the desired outcome without relying on the Dajax library, I would greatly appreciate any suggestions or step-by-step examples.

Server Side Function

-------- /jim/ajax.py---------

@dajaxice_register 
def missedCalls(request, user): 
    print "Ajax:missedCalls"    #never prints...
    missedCalls = ScheduledCall.objects.filter(status__exact='Missed') 
    render = render_to_string('examples/pagination_page.html', { 'missedCalls': missedCalls }) 
    dajax = Dajax() 
    dajax.assign('#calls','innerHTML', render) 
    return dajax.json() 

-------page.html---------

<script type='text/javascript'>
   function missed_calls_callback(data){
      // The Dajax library expects a function as a return call.
      // I'm unsure about the role of this part of the function.
      // What should be included here?
      alert(data.message);
   }  
 </script>

 <!-- Button -->
 <input type="button" name="calltest" value="JQuery Test" 
    id="calltest" onclick="Dajaxice.jim.missedCalls(missed_calls_callback, {'user':{{ user }}})">


  <div id="calls">
     {% include "calls.html" %}
  </div>

--------calls.html--------

<h2> Missed Calls</h2>
<ul>         
{% for i in missedCalls.object_list %}         
    <li>{{ i }}</li>
{% endfor %}     
</ul>  

Answer №1

Before diving into a library, it can be beneficial to manually test things out first (to understand the process).

An ajax request functions similarly to a standard HTTP request, with the key difference being that it occurs asynchronously (outside of the regular request/response flow) and typically returns json or xml data (although html is an option as well).

To handle an AJAX request, you simply create a corresponding URL and view as you normally would in Django.

urls.py

...
url(r"^/my/ajax/path/$", myapp.views.ajax_view, name="do-something-ajaxy"),
...

views.py

def ajax_view(self, request):
    # Check if the request is Ajax using Django's Request objects method is_ajax()
    if request.is_ajax():
        raise Http404
    missedCalls = ScheduledCall.objects.filter(status__exact='Missed') 
    # Return a JSON object which can be manipulated by JavaScript upon receiving it
    return HttpResponse(simplejson.dumps(missedCalls), mimetype='application/javascript')

https://docs.djangoproject.com/en/dev/ref/request-response/#django.http.HttpRequest.is_ajax

To execute the AJAX request using jQuery:

(function($){
    $.ajax({
        type: 'GET',
        url: '/my/ajax/path/',
        success: function(data){
            for call in data:
                /* Perform actions on each missed call */
        },
    });
});

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