Partial code only

app-obj.js

function initLocalStorageControls() {
    var userMessage, dataKey, dataValue, storedData, dataObj = {}, dataString = '', obj = {};

    if (Modernizr.localstorage) {
        console.log('Local storage is available');
        $('form').fadeIn();
        userMessage = 'Use the form below to add and display data.';

        // Pre-fill form
        storedData = localStorage.getItem('userData');
        try {
            obj = JSON.parse(storedData);
            console.log('Successfully read the stored string into JSON: ' + obj);

            Object.keys(obj).forEach(function(key) {
                if (obj[key] !== null) {
                    console.log(key, obj[key]);

                    $('#' + key).val(obj[key]);
                }
            });
        }
        catch(errorObj) {
            console.log('There was an error reading the stored data:');
            console.log(errorObj);
        }

    } else {
        console.log('Local storage NOT available');
        userMessage = 'Sorry, local storage is not available.';
        $('form').fadeOut();
    }
    $('#status-message').text(userMessage);
    $('button#update-details').on('click', function(e) {
        console.log('Button clicked');
        e.preventDefault();
        $('input').each(function(index) {
            dataKey = $(this).attr('id');
            dataValue = $(this).val();
            dataObj[dataKey] = dataValue;
            dataObjString = JSON.stringify(dataObj);
        });
        localStorage.setItem('userData', dataObjString);
    });