learning_jquery/Chapter 4/04.js

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

  var $speech = $('div.speech');
  var defaultSize = $speech.css('fontSize');
  $('#switcher button').click(function () {
    var num = parseFloat($speech.css('fontSize'));
    switch (this.id) {
      case 'switcher-large':
        num *= 1.4;
        break;
      case 'switcher-small':
        num /= 1.4;
        break;
      default:
        num = parseFloat(defaultSize);
    }
    $speech.animate({fontSize: num + 'px'}, 'slow');
  });

  var $firstPara = $('p').eq(1);
  $firstPara.hide();
  $('a.more').click(function (event) {
    event.preventDefault();
    $firstPara.animate({
      opacity: 'toggle',
      height: 'toggle'
    }, 'slow');
    var $link = $(this);
    if ($link.text() == 'read more') {
      $link.text('read less');
    } else {
      $link.text('read more');
    }
  });

  $('div.label').click(function () {
    var paraWidth = $('div.speech p').outerWidth();
    var $switcher = $(this).parent();
    var switcherWidth = $switcher.outerWidth();
    $switcher
      .css({position: 'relative'})
      .fadeTo('fast', 0.5)
      .animate({
        left: paraWidth - switcherWidth
      }, {
        duration: 'slow',
        queue: false
      })
      .fadeTo('slow', 1.0)
      .slideUp('slow', function () {
        $switcher.css({backgroundColor: '#f00'});
      })
      .slideDown('slow');
    });

  $('p').eq(2)
    .css('border', '1px solid #333')
    .click(function () {
      var $clickedItem = $(this);
    $clickedItem.next().slideDown('slow', function () {
        $clickedItem.slideUp('slow');
    });
  });
  $('p').eq(3).css('backgroundColor', '#ccc').hide();

  $('body').fadeTo('slow', 1);

  $('p').hover(function () {
    $(this).toggleClass('highlighted');
  });

  $('h2').click(function (event) {
    var $h2 = $(this);
    $h2.css('position', 'relative');
    $h2.animate({
      opacity: '0.25',
      left: '20px'
    }, 'slow', 'swing', function () {
      $('.speech').animate({'opacity': '0.5'}, 'slow');
    });
  });

  var $switcher = $('#switcher');
  // Make the switcher movable, and readable even over other text.
  $switcher.css({
    position: 'relative',
    backgroundColor: 'white',
    opacity: 0.8
  });
  $(document).keydown(function (event) {
    var move;
    switch (event.which) {
      case 37: move = {left: '-=20px'}; break;
      case 38: move = {top: '-=20px'}; break;
      case 39: move = {left: '+=20px'}; break;
      case 40: move = {top: '+=20px'}; break;
    }
    $switcher.animate(move, 'fast');
  });

});