learning_jquery/Chapter 3/03.js

$(document).ready(function () {
  'use strict';

  $('#switcher  ').hover(function() {
    $(this).addClass('hover');
  }, function() {
    $(this).removeClass('hover');
  });
});

$(document).ready(function () {
  'use strict';

  var toggleSwitcher = function(event) {
    if (!$(event.target).is('button')) {
      $('#switcher button').toggleClass('hidden');
    }
  };

  $('#switcher').on('click', toggleSwitcher);
  $('#switcher').click();

  $('#switcher button').click(function () {
    $('#switcher').off('click', toggleSwitcher);

    if (this.id === 'switcher-default') {
      $('#switcher').on('click', toggleSwitcher);
    }

  });
});

$(document).ready(function () {
  'use strict';
  $('#switcher-default').addClass('selected');

  $('#switcher').click(function(event) {
    if ($(event.target).is('button')) {
      var bodyClass = event.target.id.split('-')[1];

      $('body').removeClass().addClass(bodyClass);

      $('#switcher button').removeClass('selected');
      $(event.target).addClass('selected');
    }
  });
});

$(document).ready(function () {
  'use strict';
  var triggers = {
    D: 'default',
    N: 'narrow',
    L: 'large'
  };
  // Use keydown/keyup to identify key, keypress to identify resulting letter.
  $(document).keyup(function (event) {
    var key = String.fromCharCode(event.which);
    if (key in triggers) {
      $('#switcher-' + triggers[key]).click();
    }
  });
});