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<!DOCTYPE html>
<html>
<head>
  <meta name="description" content="Undo/Redo using Mutation Observers" />
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1, minimal-ui">
  <title>Undo/Redo using Mutation Observers</title>  
  <script src="https://rawgit.com/jzaefferer/undo/master/undo.js"></script>
 
</head>
<body>
<button class="undo btn" href="#">Undo</button>
    <button class="redo btn" href="#">Redo</button>
    <section id="todoapp">
            <header id="header">
                <h1>todos</h1>
                <form id="addTodos">
                <input id="new-todo" placeholder="What needs to be done?" autofocus>
                </form>
            </header>
            <section id="main">
                <input id="toggle-all" type="checkbox">
                <ul id="todo-list">
                  <template id="my-template">
                        <li>
                            <div class="view">
                                <input class="toggle" type="checkbox">
                                <label class="item" contenteditable="true"></label>
                            </div>
                        </li>
                    </template>
                </ul>
            </section>
</body>
</html>
 
html,
body {
    margin: 0;
    padding: 0;
}
​
button {
    margin: 0;
    padding: 0;
    border: 0;
    background: none;
    font-size: 100%;
    vertical-align: baseline;
    font-family: inherit;
    font-weight: inherit;
    color: inherit;
    -webkit-appearance: none;
    -ms-appearance: none;
    appearance: none;
    -webkit-font-smoothing: antialiased;
    -moz-font-smoothing: antialiased;
    -ms-font-smoothing: antialiased;
    font-smoothing: antialiased;
}
​
body {
    font: 14px 'Helvetica Neue', Helvetica, Arial, sans-serif;
    line-height: 1.4em;
    background: #f5f5f5;
    color: #4d4d4d;
    width: 550px;
    margin: 0 auto;
    -webkit-font-smoothing: antialiased;
    -moz-font-smoothing: antialiased;
    -ms-font-smoothing: antialiased;
    font-smoothing: antialiased;
    font-weight: 300;
    padding-top: 40px;
}
​
button,
input[type="checkbox"] {
    outline: none;
}
​
.hidden {
    display: none;
}
​
#todoapp {
    background: #fff;
    margin: 130px 0 40px 0;
    position: relative;
    box-shadow: 0 2px 4px 0 rgba(0, 0, 0, 0.2),
                0 25px 50px 0 rgba(0, 0, 0, 0.1);
}
​
#todoapp input::-webkit-input-placeholder {
    font-style: italic;
    font-weight: 300;
    color: #e6e6e6;
}
​
#todoapp input::-moz-placeholder {
    font-style: italic;
    font-weight: 300;
    color: #e6e6e6;
}
​
#todoapp input::input-placeholder {
    font-style: italic;
    font-weight: 300;
    color: #e6e6e6;
}
​
#todoapp h1 {
    position: absolute;
    top: -110px;
    width: 100%;
    font-size: 50px;
    font-weight: 300;
    text-align: center;
    text-decoration: underline;
    text-transform: uppercase;
    color: rgba(255, 255, 255, 0.2);
    text-shadow: -1px -1px rgba(0, 0, 0, 0.2);
    -webkit-text-rendering: optimizeLegibility;
    -moz-text-rendering: optimizeLegibility;
    -ms-text-rendering: optimizeLegibility;
    text-rendering: optimizeLegibility;
}
​
#new-todo,
.edit {
    position: relative;
    margin: 0;
    width: 100%;
    font-size: 24px;
    font-family: inherit;
    font-weight: inherit;
    line-height: 1.4em;
    border: 0;
    outline: none;
    color: inherit;
    padding: 6px;
    border: 1px solid #999;
    box-shadow: inset 0 -1px 5px 0 rgba(0, 0, 0, 0.2);
    -moz-box-sizing: border-box;
    -ms-box-sizing: border-box;
    box-sizing: border-box;
    -webkit-font-smoothing: antialiased;
    -moz-font-smoothing: antialiased;
    -ms-font-smoothing: antialiased;
    font-smoothing: antialiased;
}
​
#new-todo {
    padding: 16px 16px 16px 60px;
    border: none;
    background: rgba(0, 0, 0, 0.003);
    box-shadow: inset 0 -2px 1px rgba(0,0,0,0.03);
}
​
#main {
    position: relative;
    z-index: 2;
    border-top: 1px solid #e6e6e6;
}
​
label[for='toggle-all'] {
    display: none;
}
​
#toggle-all {
    position: absolute;
    top: -55px;
    left: -15px;
    width: 60px;
    height: 34px;
    text-align: center;
    border: none; /* Mobile Safari */
}
​
#toggle-all:before {
    content: '❯';
    font-size: 22px;
    color: #e6e6e6;
    padding: 10px 27px 10px 27px;
}
​
#toggle-all:checked:before {
    color: #737373;
}
​
#todo-list {
    margin: 0;
    padding: 0;
    list-style: none;
}
​
#todo-list li {
    position: relative;
    font-size: 24px;
    border-bottom: 1px solid #ededed;
}
​
#todo-list li:last-child {
    border-bottom: none;
}
​
#todo-list li.editing {
    border-bottom: none;
    padding: 0;
}
​
#todo-list li.editing .edit {
    display: block;
    width: 506px;
    padding: 13px 17px 12px 17px;
    margin: 0 0 0 43px;
}
​
#todo-list li.editing .view {
    display: none;
}
​
#todo-list li .toggle {
    text-align: center;
    width: 40px;
    /* auto, since non-WebKit browsers doesn't support input styling */
    height: auto;
    position: absolute;
    top: 0;
    bottom: 0;
    margin: auto 0;
    border: none; /* Mobile Safari */
    -webkit-appearance: none;
    -ms-appearance: none;
    appearance: none;
}
​
#todo-list li .toggle:after {
    content: '✔';
    line-height: 43px; /* 40 + a couple of pixels visual adjustment */
    font-size: 20px;
    color: #d9d9d9;
    text-shadow: 0 -1px 0 #bfbfbf;
}
​
#todo-list li .toggle:checked:after {
    color: #aedad2;
    text-shadow: 0 1px 0 #abd1ca;
    bottom: 1px;
    position: relative;
    opacity: 0.7;
}
​
#todo-list li label {
    white-space: pre;
    word-break: break-word;
    padding: 15px 60px 15px 15px;
    margin-left: 45px;
    display: block;
    line-height: 1.2;
    -webkit-transition: color 0.4s;
    transition: color 0.4s;
}
​
#todo-list li.completed label {
    color: #d9d9d9;
    text-decoration: line-through;
}
​
#todo-list li .destroy {
    display: none;
    position: absolute;
    top: 0;
    right: 10px;
    bottom: 0;
    width: 40px;
    height: 40px;
    margin: auto 0;
    font-size: 30px;
    color: #cc9a9a;
    margin-bottom: 11px;
    -webkit-transition: color 0.2s ease-out;
    transition: colo 0.2s ease-out;
}
​
#todo-list li .destroy:hover {
    color: #af5b5e;
}
​
#todo-list li .destroy:after {
    content: '×';
}
​
#todo-list li:hover .destroy {
    display: block;
}
​
#todo-list li .edit {
    display: none;
}
​
#todo-list li.editing:last-child {
    margin-bottom: -1px;
}
​
#footer {
    color: #777;
    padding: 10px 15px;
    height: 20px;
    text-align: center;
    border-top: 1px solid #e6e6e6;
}
​
#footer:before {
    content: '';
    position: absolute;
    right: 0;
    bottom: 0;
    left: 0;
    height: 50px;
    overflow: hidden;
    box-shadow: 0 1px 1px rgba(0, 0, 0, 0.2),
                0 8px 0 -3px #f6f6f6,
                0 9px 1px -3px rgba(0, 0, 0, 0.2),
                0 16px 0 -6px #f6f6f6,
                0 17px 2px -6px rgba(0, 0, 0, 0.2);
}
​
#todo-count {
    float: left;
    text-align: left;
}
​
#todo-count strong {
    font-weight: 300;
}
​
#filters {
    margin: 0;
    padding: 0;
    list-style: none;
    position: absolute;
    right: 0;
    left: 0;
}
​
#filters li {
    display: inline;
}
​
#filters li a {
    color: inherit;
    margin: 3px;
    text-decoration: none;
}
​
#filters li a.selected {
    text-shadow: 0 0 20px rgba(175, 47, 47, 0.7);
}
​
#clear-completed,
html #clear-completed:active {
    float: right;
    position: relative;
    line-height: 20px;
    text-decoration: none;
    cursor: pointer;
    visibility: hidden;
    position: relative;
}
​
#clear-completed::after {
    visibility: visible;
    content: 'Clear completed';
    position: absolute;
    right: 0;
}
​
#filters li a,
#clear-completed {
    -webkit-transition: text-shadow 0.2s ease-in-out;
    transition: text-shadow 0.2s ease-in-out;
}
​
#filters li a:hover,
#clear-completed:hover {
    text-shadow: 0 0 20px rgba(175, 47, 47, 0.3);
}
​
#info {
    margin: 65px auto 0;
    color: #ccc;
    font-size: 10px;
    text-shadow: 0 1px 0 rgba(255, 255, 255, 0.5);
    text-align: center;
}
​
#info a {
    color: inherit;
    text-decoration: none;
    font-weight: 400;
}
​
#info a:hover {
    text-decoration: underline;
}
​
.btn {
    text-decoration: underline;
    font-weight: bold;
}
​
.btn[disabled] {
    color: #ccc;
}
​
/*
    Hack to remove background from Mobile Safari.
    Can't use it globally since it destroys checkboxes in Firefox and Opera
*/
@media screen and (-webkit-min-device-pixel-ratio:0) {
    #toggle-all,
    #todo-list li .toggle {
        background: none;
    }
​
    #todo-list li .toggle {
        height: 40px;
    }
​
    #toggle-all {
        -webkit-transform: rotate(90deg);
        transform: rotate(90deg);
        -webkit-appearance: none;
        appearance: none;
    }
}
 
/*@addyosmani*/    
document.addEventListener("DOMContentLoaded", function () {
​
        var x = document.querySelector.bind(document);
        var el = x("#todo-list");
        var startValue = el.innerHTML;
        var blocked = false;
        var undo = x(".undo");
        var redo = x(".redo");
        var input = x("#new-todo");
        var form = x("#addTodos");
        var stack = new Undo.Stack();
        var list = [];
        var lastItem = null;
        var newValue = "";
        var t = x("#my-template");
​
        var MutationObserver = window.MutationObserver || window.WebKitMutationObserver || window.MozMutationObserver;
​
        var observer = new MutationObserver(function (mutations) {          
            if(blocked){
                blocked = false;
                return;
            }
            
            newValue = el.innerHTML;
            stack.execute(new EditCommand(el, startValue, newValue));
            startValue = newValue;
        });
​
        observer.observe(el, {
            attributes: true,
            childList: true,
            characterData: true,
            characterDataOldValue: true,
            subtree: true
        });
​
        var EditCommand = Undo.Command.extend({
            constructor: function (textarea, oldValue, newValue) {
                this.el = el;
                this.oldValue = oldValue;
                this.newValue = newValue;
            },
            execute: function () {},
            undo: function () {
                blocked = true;
                lastItem = list[list.length-1];
                list.pop();
                this.el.innerHTML = this.oldValue;
            },
​
            redo: function () {
                blocked = true;
                if(lastItem){
                  list.push(lastItem);
                }
                this.el.innerHTML = this.newValue;
            }
        });
​
​
    function todosUI(){
      el.innerHTML = "";
      for (var i=0; i < list.length; i++){
        var todo = list[i];
        var tmpl = t.content.cloneNode(true);
 tmpl.querySelector('.item').innerHTML = todo.label;
        el.appendChild(tmpl);
      }
    }
​
    function stackUI() {
        redo.disabled = !stack.canRedo();
        undo.disabled = !stack.canUndo();
    }
  
        stackUI();
​
        undo.addEventListener("click", function () {
            stack.undo();
        });
​
        redo.addEventListener("click", function () {
            stack.redo();
        });
​
       
        stack.changed = function () {
            stackUI();
        };
​
        form.onsubmit = function (e) {
          e.preventDefault();
            list.push({ label: input.value });
            todosUI();
            input.value = '';
        };
    });
​
​
​
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