jQuery效果之文本框失去焦点
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
<link rel="stylesheet" type="text/css" href="style/hdw.css"/>
<script type="text/javascript" src="js/jquery-1.6.4.min.js"></script>
<script type="text/javascript">
$(document).ready(function(){
$(":input").focus(function(){
$(this).addClass("focusa");
if ($(this).val()==this.defaultValue){
$(this).val("");
}
}).blur(function(){
$(this).removeClass("focusa");
if ($(this).val()==""){
$(this).val(this.defaultValue);
}
});
});
</script>
</head>
<body>
<form action="" method="post">
<fieldset>
<legend>个人信息</legend>
<div>
<label for="username">姓名：</label>
<input type="text" id="username" value="小王" />
</div>
<div>
<label for="pass">密码：</label>
<input type="password" id="pass" value="123" />
</div>
<div>
<label for="hdw">内容：</label>
<textarea id="hdw">内容</textarea>
</div>
</fieldset>
</form>
</body>
</html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
<link rel="stylesheet" type="text/css" href="style/hdw.css"/>
<script type="text/javascript" src="js/jquery-1.6.4.min.js"></script>
<script type="text/javascript">
$(document).ready(function(){
$(":input").focus(function(){
$(this).addClass("focusa");
if ($(this).val()==this.defaultValue){
$(this).val("");
}
}).blur(function(){
$(this).removeClass("focusa");
if ($(this).val()==""){
$(this).val(this.defaultValue);
}
});
});
</script>
</head>
<body>
<form action="" method="post">
<fieldset>
<legend>个人信息</legend>
<div>
<label for="username">姓名：</label>
<input type="text" id="username" value="小王" />
</div>
<div>
<label for="pass">密码：</label>
<input type="password" id="pass" value="123" />
</div>
<div>
<label for="hdw">内容：</label>
<textarea id="hdw">内容</textarea>
</div>
</fieldset>
</form>
</body>
</html>
CSS
/* CSS Document */
* { padding:0; margin:0;}
body { font-size:12px; font-family:"宋体";}
form { width:500px; position:absolute; top:50%; left:50%; margin:-70px 0 0 -250px;}
fieldset { border:2px solid green; padding:10px;}
legend { font-size:13px; font-weight:bold; padding:10px; color:green;}
div { padding:5px 0;}
label { color:green;}
input { height:25px; border:1px solid #C9C9C9; width:200px; font-size:12px; font-family:"宋体"; padding:0 5px; line-height:25px;}
textarea { width:200px; height:100px; border:1px solid green; font-size:12px; font-family:"宋体"; padding:5px; vertical-align:middle;}
.focusa { border:1px solid green; background:#FFF0FF;}