***综合类***智能型的提交表单 （验证表单的有效性如有无输入）
把下列代码加到网页的<body></body>标签之间 从google下载我的照片管理软件<html>
<head>
<title>可以检测正确性的友情链接发送表单</title>
<script language="javascript">
<!--
function validate_form() {
validity = true;
if (!check_empty(document.form.name.value))
{ validity = false; alert('没有填写姓名!'); }
if (!check_email(document.form.email.value))
{ validity = false; alert('email地址错误!'); }
if (!check_url(document.form.url.value))
{ validity = false; alert('主页网址错误!'); }
if (!check_empty(document.form.description.value))
{ validity = false; alert('缺少内容简介!'); }
if (validity)
alert ("needed entries have been verified. "
+ "your form is now being passed to your browser's "
+ "mail delivery sub-system.");
return validity;
}
function check_empty(text) {
return (text.length > 0);
}
function check_email(address) {
if ((address == "")
|| (address.indexof ('@') == -1)
|| (address.indexof ('.') == -1))
return false;
return true;
}
function check_url(address) {
if ((address == "")
|| (address.indexof ('http://') == -1)
|| (address.indexof ('.') == -1))
return false;
return true;
}
// -->
</script>
</head>
<body>
<form name="form" method="post" action="mailto:l@2.3.4.net?subject=友情连接"
enctype="text/plain" onsubmit="return validate_form()">
<p>姓名:<br>
<input type="text" size="40" name="name"><br>
email地址:<br>
<input type="text" size="40" name="email"><br>
主页网址:<br>
<input type="text" size="40" name="url" value="http://"><br>
内容简介:<br>
<textarea name="description" rows="5" cols="40" wrap="virtual">
--------------------------------------
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