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Online Spreadsheet

The goal of this problem is to create a simple online spreadsheet app that is capable of loading and saving its data. Your app should consist, at a minimum, of a table of editable cells and a form allowing the user to load and save data.

To evaluate your submission, we will include a javascript test harness in your HTML file that implements two functions: load_data(key), which takes a data key and returns a JSON representation of the data to be loaded into the table, and save_data(key, data), which takes a key and a JSON representation of the data currently in the table. Both the data key and the JSON representation are expected to be strings. Your form should consist of a text input field for the data key and load and save buttons. When the load button is clicked, you should call the load_data() function and populate the cells accordingly. When the save button is clicked, you should call the save_data() function with the data key and the data in the table.

The JSON data format is simply a two-dimensional array containing the values to be loaded in each cell. For example, the following JSON string:

'[[1], [2, 3], [4, 5, 6], [], [7, 8, 9, 0]]'

would represent the following table:

   +-----+-----+-----+-----+-----+
   |  1  |     |     |     |     |
   +-----+-----+-----+-----+-----+
   |  2  |  3  |     |     |     |
   +-----+-----+-----+-----+-----+
   |  4  |  5  |  6  |     |     |
   +-----+-----+-----+-----+-----+
   |     |     |     |     |     |
   +-----+-----+-----+-----+-----+
   |  7  |  8  |  9  |  0  |     |
   +-----+-----+-----+-----+-----+
   |     |     |     |     |     |
   +-----+-----+-----+-----+-----+

Your spreadsheet should support a minimum of 8 rows and 8 columns.

Extra Credit

If you have extra time, you can attempt to implement the following features:

  • Arrow-key navigation between cells

  • Multi-cell mouse selection and clearing with delete key

    • Clicking a cell and dragging the mouse should select all cells within the box defined by the start and end points; pressing the delete key should clear the data in the selected cells.

  • Formula cells

    • Similar to Excel: if you enter =A1+B2*4 it should fill in the cell with the computed value.

Submission Instructions

  • You may make use of the jquery base library, but all other html/css/js must be written by you during the test period.

  • Submit your solution as a pull request with the html/css/js/img files required for your app. We will manually edit the html to include the javascript test harness and open it locally in a browser to evaluate it.

  • We evaluate your solution as intended users of the spreadsheet app as well as developers, looking for code organization and readability.