MyFitnessPal UserScript to AutoFocus on quantity when editing a food entry

MyFitnessPal_AutoFocus_quantity_food_entry_editing.js

// ==UserScript==
// @name         MyFitnessPal Input Focus
// @namespace    http://www.rgbink.com/
// @version      0.1
// @author       Anthony DeCrescenzo
// @match        http*://www.myfitnesspal.com/food/diary*
// @grant        none
// @description  A script to automatically focus on the quantity input field when editing a food entry. So, if you click to edit a food item, when the popup appears the quantity will be highlighted, ready to be replaced/typed over.
// ==/UserScript==

(function ()
{
    'use strict';

    $('.js-show-edit-food').on('click', function ()
    {

        window.setTimeout(focusFunction, 600);

        function focusFunction()
        {
            $('#food_entry_quantity').focus().select();
        }
    }
    );
}
)();

See image for simple explanation. In short the fix is simply to autofocus and select the quantity field when editing a food. Sometimes you might want to do something other than this, but for me 99% of the time I want to adjust the quantity. So… autofocus!