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Mar 14, 2015
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Frontend Interview - Assignment

In this folder, find the file frontend_interview_http_server.py. It functions as follows:

  1. It responds to a GET request with the url /get_update by sending a JSON response (to be expounded upon later)
  2. It responds to any other GET request by trying to return a file with that path and name

Run it using python3 frontend_interview_http_server.py: It will start an HTTP server on port 7000. Go to http://127.0.0.1:7000/ and see the response. Also examine the responses at the url http://127.0.0.1:7000/get_update.

Essentially, /get_update returns a single item (as JSON) which is part of some list. A sample is: {"display": "Frank Exchange Of Views", "item_id": 22, "selected": 1}. Here, item_id is the position in the list. It can be any non-negative integer; display is the text that shown beside that item and selected is whether the item is highlighted.

Okay, got it. So what do I do?

You have to make an HTML + JS page which runs in a browser (we will test on Google Chrome) and does the following:

  1. Makes an AJAX query to /get_update once every second
  2. The item contained in the response is to be shown as a list (ordered by item_id)
  3. If an item_id is repeated, it should replace the old one in the list
  4. If selected is non-zero, then highlight the item

Notes:

  1. We leave the formatting up to you. Do as you deem best
  2. You can use jQuery and/or Bootstrap (+Theme) if you desire
  3. Your JS can be inline or served as a seperate file. frontend_interview_http_server.py will dutifully serve any file from the folder so your JS, CSS, fonts, etc can be put alongside with ease
  4. We will be reachable on chat and via email during the duration of this assignment to clear doubts regarding the assignment. No hints will be given though

That was easy. What next?

Good. Now, you may attempt the following enhancements to your solution for additional credit:

  1. Format it (the displayed document) nicely, in a tabular manner using Bootstrap Theme
  2. Highlight only 1 item at a time. New items with a non-zero selected tag will cause old selected items to automatically de-select
  3. Show an error on the page if the server is not responding correctly or if there was any problem in parsing the response
  4. Serve the pages and the JSON responses from different programs. (For example, the updates on port 7070). You may need to modify the server code as well. Hint: Cross-origin resource sharing (CORS)
  5. Add a filter such that only items which match the (regex) filter are displayed and the rest are hidden

Notes (Reprise):

  1. You may solve the enhancements section problems in any order, or skip any which are too difficult
  2. Scoring is as follow:
Question Credits
Primary Section 50
Enhancement - 1 5
Enhancement - 2 10
Enhancement - 3 5
Enhancement - 4 15
Enhancement - 5 15