Created
July 8, 2012 15:56
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Vanilla Todo
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(function() { | |
'use strict'; | |
var todos = [], | |
stat = {}, | |
ENTER_KEY = 13; | |
window.addEventListener( 'load', windowLoadHandler, false ); | |
function Todo( title, completed ) { | |
this.id = getUuid(); | |
this.title = title; | |
this.completed = completed; | |
} | |
function Stat() { | |
this.todoLeft = 0; | |
this.todoCompleted = 0; | |
this.totalTodo = 0; | |
} | |
function windowLoadHandler() { | |
loadTodos(); | |
refreshData(); | |
addEventListeners(); | |
} | |
function addEventListeners() { | |
document.getElementById('new-todo').addEventListener( 'keypress', newTodoKeyPressHandler, false ); | |
document.getElementById('toggle-all').addEventListener( 'change', toggleAllChangeHandler, false ); | |
} | |
function inputEditTodoKeyPressHandler( event ) { | |
var inputEditTodo = event.target, | |
trimmedText = inputEditTodo.value.trim(), | |
todoId = event.target.id.slice( 6 ); | |
if ( trimmedText ) { | |
if ( event.keyCode === ENTER_KEY ) { | |
editTodo( todoId, trimmedText ); | |
} | |
} else { | |
removeTodoById( todoId ); | |
refreshData(); | |
} | |
} | |
function inputEditTodoBlurHandler( event ) { | |
var inputEditTodo = event.target, | |
todoId = event.target.id.slice( 6 ); | |
editTodo( todoId, inputEditTodo.value ); | |
} | |
function newTodoKeyPressHandler( event ) { | |
if ( event.keyCode === ENTER_KEY ) { | |
addTodo( document.getElementById('new-todo').value ); | |
} | |
} | |
function toggleAllChangeHandler( event ) { | |
for ( var i in todos ) { | |
todos[ i ].completed = event.target.checked; | |
} | |
refreshData(); | |
} | |
function spanDeleteClickHandler( event ) { | |
removeTodoById( event.target.getAttribute('data-todo-id') ); | |
refreshData(); | |
} | |
function hrefClearClickHandler() { | |
removeTodosCompleted(); | |
refreshData(); | |
} | |
function todoContentHandler( event ) { | |
var todoId = event.target.getAttribute('data-todo-id'), | |
div = document.getElementById( 'li_' + todoId ), | |
inputEditTodo = document.getElementById( 'input_' + todoId ); | |
div.className = 'editing'; | |
inputEditTodo.select(); | |
} | |
function checkboxChangeHandler( event ) { | |
var checkbox = event.target, | |
todo = getTodoById( checkbox.getAttribute('data-todo-id') ); | |
todo.completed = checkbox.checked; | |
refreshData(); | |
} | |
function loadTodos() { | |
if ( !localStorage.getItem('todos-vanillajs') ) { | |
localStorage.setItem( 'todos-vanillajs', JSON.stringify([]) ); | |
} | |
todos = JSON.parse( localStorage.getItem('todos-vanillajs') ); | |
} | |
function addTodo( text ) { | |
var trimmedText = text.trim(); | |
if ( trimmedText ) { | |
var todo = new Todo( trimmedText, false ); | |
todos.push( todo ); | |
refreshData(); | |
} | |
} | |
function editTodo( todoId, text ) { | |
var i, l; | |
for ( i = 0, l = todos.length; i < l; i++ ) { | |
if ( todos[ i ].id === todoId ) { | |
todos[ i ].title = text; | |
} | |
} | |
refreshData(); | |
} | |
function removeTodoById( id ) { | |
var i = todos.length; | |
while ( i-- ) { | |
if ( todos[ i ].id === id ) { | |
todos.splice( i, 1 ); | |
} | |
} | |
} | |
function removeTodosCompleted() { | |
var i = todos.length; | |
while ( i-- ) { | |
console.log(i); | |
if ( todos[ i ].completed ) { | |
todos.splice( i, 1 ); | |
} | |
} | |
} | |
function getTodoById( id ) { | |
var i, l; | |
for ( i = 0, l = todos.length; i < l; i++ ) { | |
if ( todos[ i ].id === id ) { | |
return todos[ i ]; | |
} | |
} | |
} | |
function refreshData() { | |
saveTodos(); | |
computeStats(); | |
redrawTodosUI(); | |
redrawStatsUI(); | |
changeToggleAllCheckboxState(); | |
} | |
function saveTodos() { | |
localStorage.setItem( 'todos-vanillajs', JSON.stringify( todos ) ); | |
} | |
function computeStats() { | |
var i, l; | |
stat = new Stat(); | |
stat.totalTodo = todos.length; | |
for ( i = 0, l = todos.length; i < l; i++ ) { | |
if ( todos[ i ].completed ) { | |
stat.todoCompleted++; | |
} | |
} | |
stat.todoLeft = stat.totalTodo - stat.todoCompleted; | |
} | |
function redrawTodosUI() { | |
var todo, checkbox, label, deleteLink, divDisplay, inputEditTodo, li, i, l, | |
ul = document.getElementById('todo-list'); | |
document.getElementById('main').style.display = todos.length ? 'block' : 'none'; | |
ul.innerHTML = ''; | |
document.getElementById('new-todo').value = ''; | |
for ( i = 0, l = todos.length; i < l; i++ ) { | |
todo = todos[ i ]; | |
// create checkbox | |
checkbox = document.createElement('input'); | |
checkbox.className = 'toggle'; | |
checkbox.setAttribute( 'data-todo-id', todo.id ); | |
checkbox.type = 'checkbox'; | |
checkbox.addEventListener( 'change', checkboxChangeHandler ); | |
// create div text | |
label = document.createElement('label'); | |
label.setAttribute( 'data-todo-id', todo.id ); | |
label.appendChild( document.createTextNode( todo.title ) ); | |
// create delete button | |
deleteLink = document.createElement('button'); | |
deleteLink.className = 'destroy'; | |
deleteLink.setAttribute( 'data-todo-id', todo.id ); | |
deleteLink.addEventListener( 'click', spanDeleteClickHandler ); | |
// create divDisplay | |
divDisplay = document.createElement('div'); | |
divDisplay.className = 'view'; | |
divDisplay.setAttribute( 'data-todo-id', todo.id ); | |
divDisplay.appendChild( checkbox ); | |
divDisplay.appendChild( label ); | |
divDisplay.appendChild( deleteLink ); | |
divDisplay.addEventListener( 'dblclick', todoContentHandler ); | |
// create todo input | |
inputEditTodo = document.createElement('input'); | |
inputEditTodo.id = 'input_' + todo.id; | |
inputEditTodo.className = 'edit'; | |
inputEditTodo.value = todo.title; | |
inputEditTodo.addEventListener( 'keypress', inputEditTodoKeyPressHandler ); | |
inputEditTodo.addEventListener( 'blur', inputEditTodoBlurHandler ); | |
// create li | |
li = document.createElement('li'); | |
li.id = 'li_' + todo.id; | |
li.appendChild( divDisplay ); | |
li.appendChild( inputEditTodo ); | |
if ( todo.completed ) { | |
li.className += 'complete'; | |
checkbox.checked = true; | |
} | |
ul.appendChild( li ); | |
} | |
} | |
function changeToggleAllCheckboxState() { | |
var toggleAll = document.getElementById('toggle-all'); | |
toggleAll.checked = stat.todoCompleted === todos.length; | |
} | |
function redrawStatsUI() { | |
removeChildren( document.getElementsByTagName('footer')[0] ); | |
document.getElementById('footer').style.display = todos.length ? 'block' : 'none'; | |
if ( stat.todoCompleted ) { | |
drawTodoClear(); | |
} | |
if ( stat.totalTodo ) { | |
drawTodoCount(); | |
} | |
} | |
function drawTodoCount() { | |
var number = document.createElement('strong'), | |
remaining = document.createElement('span'), | |
text = ' ' + ( stat.todoLeft === 1 ? 'item' : 'items' ) + ' left'; | |
// create remaining count | |
number.innerHTML = stat.todoLeft; | |
remaining.id = 'todo-count'; | |
remaining.appendChild( number ); | |
remaining.appendChild( document.createTextNode( text ) ); | |
document.getElementsByTagName('footer')[0].appendChild( remaining ); | |
} | |
function drawTodoClear() { | |
var buttonClear = document.createElement('button'); | |
buttonClear.id = 'clear-completed'; | |
buttonClear.addEventListener( 'click', hrefClearClickHandler ); | |
buttonClear.innerHTML = 'Clear completed (' + stat.todoCompleted + ')'; | |
document.getElementsByTagName('footer')[0].appendChild( buttonClear ); | |
} | |
function removeChildren( node ) { | |
node.innerHTML = ''; | |
} | |
function getUuid() { | |
var i, random, | |
uuid = ''; | |
for ( i = 0; i < 32; i++ ) { | |
random = Math.random() * 16 | 0; | |
if ( i === 8 || i === 12 || i === 16 || i === 20 ) { | |
uuid += '-'; | |
} | |
uuid += ( i === 12 ? 4 : (i === 16 ? (random & 3 | 8) : random) ).toString( 16 ); | |
} | |
return uuid; | |
} | |
})(); |
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