Created
August 26, 2011 03:17
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[HTML5]Local Storage
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<!DOCTYPE HTML> | |
<html lang="ja"> | |
<head> | |
<meta charset="UTF-8"> | |
<title>Local Storage</title> | |
</head> | |
<style> | |
p.success { | |
background-color: #0f0; | |
} | |
p.fail { | |
background-color: #f00; | |
} | |
</style> | |
<body> | |
<section id="wrapper"> | |
<header> | |
<h1>Local Storage</h1> | |
</header> | |
<article> | |
<select id="list" size="5" style="width: 100px"></select> | |
<button id="btn-remove">Remove</button><br> | |
KEY:<input type="text" id="key"><br> | |
VAL:<input type="text" id="value"> | |
<button id="btn-add">Add</button> | |
<p id="status">Not Supported</p> | |
</article> | |
</section> | |
<script> | |
(function(){ | |
// ブラウザがAPIをサポートしているか | |
var status = document.getElementById('status'); | |
if(!localStorage){ | |
status.className = 'fail'; | |
} else { | |
status.className = 'success'; | |
status.innerHTML = 'Local Storage is available'; | |
} | |
function load() { | |
var list = document.getElementById('list'); | |
list.innerHTML = ''; | |
// Local Storageに保存されているデータ分繰り返す | |
for (var i = 0; i < localStorage.length; i++) { | |
// Local Storageに保存されているキーを取得する | |
var key = localStorage.key(i); | |
// 取得したデータからOptionを作成。SELECT要素に追加していく | |
list.options[list.options.length] = new Option(key, key); | |
} | |
} | |
var btnRemove = document.getElementById('btn-remove'); | |
btnRemove.onclick = function(){ | |
var list = document.getElementById('list'); | |
if (list.selectedIndex < 0) { | |
return; | |
} | |
// 選択されているインデックスの値を取得 | |
var selected = list.options[list.selectedIndex].value; | |
// その値をキーにLocal Storageのデータを削除する | |
localStorage.removeItem(selected); | |
load(); | |
}; | |
var btnAdd = document.getElementById('btn-add'); | |
btnAdd.onclick = function(){ | |
// keyに入力されている値を取得する | |
var key = document.getElementById('key').value; | |
// valueに設定されている値を取得する | |
var value = document.getElementById('value').value; | |
// 取得したkeyとvalueでLocal Storageに保存する | |
localStorage[key] = value; | |
load(); | |
}; | |
load(); | |
})(); | |
</script> | |
</body> | |
</html> |
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