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todo-indexedDB-example.html
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todo-indexedDB-example.html
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<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8 />
<title>ToDo List with IndexedDB</title>
<meta name="description" content="WebSQL To IndexedDB Live Example - last updated: May 2012">
<meta name="author" content="Ido Green">
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
<script>
var dbName = "todo3";
var dbVersion = 2.0;
var todoDB = {};
var indexedDB = window.indexedDB || window.webkitIndexedDB ||
window.mozIndexedDB;
if ('webkitIndexedDB' in window) {
window.IDBTransaction = window.webkitIDBTransaction;
window.IDBKeyRange = window.webkitIDBKeyRange;
}
todoDB.indexedDB = {};
todoDB.indexedDB.db = null;
todoDB.indexedDB.onerror = function(e) {
console.log(e);
};
todoDB.indexedDB.open = function() {
var request = indexedDB.open(dbName, dbVersion);
request.onsuccess = function(e) {
// Old api: var v = "2-beta";
console.log ("success to open DB: " + dbName);
todoDB.indexedDB.db = e.target.result;
var db = todoDB.indexedDB.db;
if (db.setVersion) {
console.log("in old setVersion: "+ db.setVersion);
if (db.version != dbVersion) {
var req = db.setVersion(dbVersion);
req.onsuccess = function () {
if(db.objectStoreNames.contains("todo")) {
db.deleteObjectStore("todo");
}
var store = db.createObjectStore("todo", {keyPath: "timeStamp"});
var trans = req.result;
trans.oncomplete = function(e) {
console.log("== trans oncomplete ==");
todoDB.indexedDB.getAllTodoItems();
}
};
}
else {
todoDB.indexedDB.getAllTodoItems();
}
}
else {
todoDB.indexedDB.getAllTodoItems();
}
}
request.onupgradeneeded = function(e) {
console.log ("going to upgrade our DB!");
todoDB.indexedDB.db = e.target.result;
var db = todoDB.indexedDB.db;
if(db.objectStoreNames.contains("todo")) {
db.deleteObjectStore("todo");
}
var store = db.createObjectStore("todo",
{keyPath: "timeStamp"});
todoDB.indexedDB.getAllTodoItems();
}
request.onfailure = todoDB.indexedDB.onerror;
};
todoDB.indexedDB.addTodo = function(todoText) {
var db = todoDB.indexedDB.db;
var trans = db.transaction(['todo'], "readwrite");
var store = trans.objectStore("todo");
var data = {
"text": todoText,
"timeStamp": new Date().getTime()
};
var request = store.put(data);
request.onsuccess = function(e) {
todoDB.indexedDB.getAllTodoItems();
};
request.onerror = function(e) {
console.log("Error Adding: ", e);
};
};
todoDB.indexedDB.deleteTodo = function(id) {
var db = todoDB.indexedDB.db;
var trans = db.transaction(["todo"], "readwrite");
var store = trans.objectStore("todo");
var request = store.delete(id);
request.onsuccess = function(e) {
todoDB.indexedDB.getAllTodoItems();
};
request.onerror = function(e) {
console.log("Error Adding: ", e);
};
};
todoDB.indexedDB.getAllTodoItems = function() {
var todos = document.getElementById("todoItems");
todos.innerHTML = "";
var db = todoDB.indexedDB.db;
var trans = db.transaction(["todo"], "readwrite");
var store = trans.objectStore("todo");
// Get everything in the store;
var keyRange = IDBKeyRange.lowerBound(0);
var cursorRequest = store.openCursor(keyRange);
cursorRequest.onsuccess = function(e) {
var result = e.target.result;
if(!!result == false)
return;
renderTodo(result.value);
result.continue();
};
cursorRequest.onerror = todoDB.indexedDB.onerror;
};
function renderTodo(row) {
var todos = document.getElementById("todoItems");
var li = document.createElement("li");
var a = document.createElement("a");
var t = document.createTextNode(row.text);
a.addEventListener("click", function() {
todoDB.indexedDB.deleteTodo(row.timeStamp);
}, false);
a.textContent = " [Delete]";
li.appendChild(t);
li.appendChild(a);
todos.appendChild(li)
}
function addTodo() {
var todo = document.getElementById("todo");
todoDB.indexedDB.addTodo(todo.value);
todo.value = "";
}
function init() {
todoDB.indexedDB.open();
}
function showAll() {
document.getElementById("ourList").innerHTML = "" ;
var request = window.indexedDB.open(dbName);
request.onsuccess = function(event) {
// Enumerate the entire object store.
var db = todoDB.indexedDB.db;
var trans = db.transaction(["todo"], IDBTransaction.READ_ONLY);
var request = trans.objectStore("todo").openCursor();
var ul = document.createElement("ul");
request.onsuccess = function(event) {
var cursor = request.result || event.result;
// If cursor is null then we've completed the enumeration.
if (!cursor) {
document.getElementById("ourList").appendChild(ul);
return;
}
var li = document.createElement("li");
li.textContent = "key: " + cursor.key + " => Todo text: " + cursor.value.text;
ul.appendChild(li);
cursor.continue();
}
}
}
$(function() {
console.log("-- lets start the party");
init();
});
</script>
<style>
#ourList {
background: lightcyan;
padding: 25px;
border-radius: 15px;
}
h1 {
font-size: 130%;
}
h3 {
font-size: 110%;
margin-top: 45px;
}
#todo {
background: lightgoldenrodyellow;
width: 250px;
}
</style>
</head>
<body>
<h1>ToDo list - IndexedDB Example</h1>
<ul id="todoItems"></ul>
<input type="text" id="todo" name="todo" placeholder="What do you need to do?" />
<input type="submit" value="Add Todo Item" onclick="addTodo(); return false;" />
<h3>Todos</h3>
<input type="submit" value="Show All Todos" onclick="showAll(); return false;" />
<div id="ourList">
</div>
</body>
</html>