Django – show loading message during long processing

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After trying the two different approaches suggested by Brandon and Murat, Brandon’s suggestion proved the most successful.

  1. Create a wrapper template that includes the javascript from http://djangosnippets.org/snippets/679/. The javascript has been modified: (i) to work without a form (ii) to hide the progress bar / display results when a ‘done’ flag is returned (iii) with the JSON update url pointing to the view described below

  2. Move the slow loading function to a thread. This thread will be passed a cache key and will be responsible for updating the cache with progress status and then its results. The thread renders the original template as a string and saves it to the cache.

  3. Create a view based on upload_progress from http://djangosnippets.org/snippets/678/ modified to (i) instead render the original wrapper template if progress_id=” (ii) generate the cache_key, check if a cache already exists and if not start a new thread (iii) monitor the progress of the thread and when done, pass the results to the wrapper template

  4. The wrapper template displays the results via document.getElementById('main').innerHTML=data.result

(* looking at whether step 4 might be better implemented via a redirect as the rendered template contains javascript that is not currently run by document.getElementById('main').innerHTML=data.result)

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