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Why I can’t add or delete id 1 or id 2 in the code?
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<title>IndexedDB</title>
<script type="text/javascript">
var indexedDB = window.indexedDB || window.webkitIndexedDB ||
window.mozIndexedDB || window.msIndexedDB;
var IDBTransaction = window.IDBTransaction || window.webkitIDBTransaction;
//declaration db
var db;
(function () {
var peopleData = [
{ name: "John Dow", email: "[email protected]" },
{ name: "Don Dow", email: "[email protected]" }
];
function initDb() {
//open the bank
var request = indexedDB.open("PeopleDB", 1);
request.onsuccess = function (evt) {
db = request.result;
};
//if bank not open
request.onerror = function (evt) {
// Função genérica para tratar os erros de todos os requests desse banco!
console.log("IndexedDB error: " + evt.target.errorCode);
};
// Este evento é implementado somente em navegadores mais recentes
request.onupgradeneeded = function (evt) {
// cria um objectStore para esse banco
var objectStore = evt.currentTarget.result.createObjectStore(
"people", { keyPath: "id", autoIncrement: true });
objectStore.createIndex("name", "name", { unique: false });
objectStore.createIndex("email", "email", { unique: true });
for (i in peopleData) {
objectStore.add(peopleData[i]);
}
};
}
function contentLoaded() {
initDb();
var btnAdd = document.getElementById("btnAdd");
var btnDelete = document.getElementById("btnDelete");
var btnPrint = document.getElementById("btnPrint");
btnAdd.addEventListener("click", function () {
var name = document.getElementById("txtName").value;
var email = document.getElementById("txtEmail").value;
var transaction = db.transaction("people", IDBTransaction.READ_WRITE);
var objectStore = transaction.objectStore("people");
var request = objectStore.add({ name:name, email: email });
request.onsuccess = function (evt) {
// do something after the add succeeded
console.log("done with insert");
};
}, false);
btnDelete.addEventListener("click", function () {
var id = document.getElementById("txtID").value;
var transaction = db.transaction("people", IDBTransaction.READ_WRITE);
var objectStore = transaction.objectStore("people");
var request = objectStore.delete(id);
request.onsuccess = function(evt) {
// It's gone!
};
}, false);
btnPrint.addEventListener("click", function () {
var output = document.getElementById("printOutput");
output.textContent = "";
var transaction = db.transaction("people", IDBTransaction.READ_WRITE);
var objectStore = transaction.objectStore("people");
var request = objectStore.openCursor();
request.onsuccess = function(evt) {
var cursor = evt.target.result;
if (cursor) {
output.textContent += "id: " + cursor.key +
" is " + cursor.value.name + " ";
cursor.continue();
}
else {
console.log("No more entries!");
}
};
}, false);
}
window.addEventListener("DOMContentLoaded", contentLoaded, false);
})();
</script>
</head>
<body>
<div id="container">
<label for="txtName">
Name:
</label>
<input type="text" id="txtName" name="txtName" />
<br />
<label for="txtEmail">
Email:
</label>
<input type="email" id="txtEmail" name="txtEmail" />
<br />
<input type="button" id="btnAdd" value="Add Record" />
<br />
<label for="txtID">
ID:
</label>
<input type="text" id="txtID" name="txtID" />
<br />
<input type="button" id="btnDelete" value="Delete Record" />
<br />
<input type="button" id="btnPrint" value="Print objectStore" />
<br />
<output id="printOutput">
</output>
</div>
</body>
</html>