<!DOCTYPE html> <head> <meta charset="UTF-8"> <title>使用数据库实现Web留言本</title>
<script> var datatable = null;
var db = openDatabase('MyData', '', 'My Database', 102400);
function init()
{
datatable = document.getElementById("datatable");
showAllData();
}
function removeAllData()
{
for (var i =datatable.childNodes.length-1; i>=0; i--)
{
datatable.removeChild(datatable.childNodes[i]);
}
var tr = document.createElement('tr');
var th1 = document.createElement('th');
var th2 = document.createElement('th');
var th3 = document.createElement('th');
th1.innerHTML = '姓名';
th2.innerHTML = '留言';
th3.innerHTML = '时间';
tr.appendChild(th1);
tr.appendChild(th2);
tr.appendChild(th3);
datatable.appendChild(tr);
}
function showData(row)
{
var tr = document.createElement('tr');
var td1 = document.createElement('td');
td1.innerHTML = row.name;
var td2 = document.createElement('td');
td2.innerHTML = row.message;
var td3 = document.createElement('td');
var t = new Date();
t.setTime(row.time);
td3.innerHTML=t.toLocaleDateString()+" "+t.toLocaleTimeString();
tr.appendChild(td1);
tr.appendChild(td2); tr.appendChild(td3);
datatable.appendChild(tr); }
function showAllData()
{
db.transaction(function(tx)
{
tx.executeSql('CREATE TABLE IF NOT EXISTS MsgData(name TEXT, message TEXT, time INTEGER)',[]);
tx.executeSql('SELECT * FROM MsgData', [], function(tx, rs)
{
removeAllData();
for(var i = 0; i < rs.rows.length; i++)
{
showData(rs.rows.item(i));
}
});
});
}
function addData(name, message, time)
{
db.transaction(function(tx)
{
tx.executeSql('INSERT INTO MsgData VALUES(?, ?, ?)',[name, message, time],function(tx, rs)
{
alert("成功保存数据!");
},
function(tx, error)
{
alert(error.source + "::" + error.message);
});
});
}
function saveData()
{
var name = document.getElementById('name').value;
var memo = document.getElementById('memo').value;
var time = new Date().getTime();
addData(name,memo,time);
showAllData();
}
</script>
</head>
<body onload="init();">
<h1>使用数据库实现Web留言本</h1>
<table>
<tr><td>姓名:</td><td><input type="text" id="name"></td></tr>
<tr><td>留言:</td><td><input type="text" id="memo"></td></tr>
<tr>
<td></td>
<td><input type="button" value="保存" onclick="saveData();"></td>
</tr>
</table>
<hr>
<table id="datatable" border="1"></table>
<p id="msg"></p>
</body>
</html>