demo1.html
<html>
<head>
<title>提交表单页</title>
<script type="text/javascript">
function myCheck()
{
for(var i=0;i<document.form1.elements.length-1;i++)
{
if(document.form1.elements[i].value=="")
{
alert("当前表单不能有空项");
document.form1.elements[i].focus();
return false;
}
}
return true;
}
</script>
</head>
<body>
<form name="form1" method="post" action="page2.html" onSubmit="return myCheck()">
用户名:<input type="text" name="username"><br>
性别:<input type="text" name="sex"><br>
出生时间:<input type="text" name="birthday"><br>
<input type="submit" value="提交">
</form>
</body>
</html>
demo2.html
<script language="Javascript">
<!--
function submit1(frm){
if (document.frm.word.value=="") {
alert("请输入搜索新闻内容！");document.frm.word.focus();return false;
}
return true;
}
//-->
</script>
<form method="POST" action="" name="frm" onsubmit="return submit1(this);">
<select name="select0">
<option value="0">请选择一个类别</option>
<option value="1">新闻</option>
<option value="2">产品</option>
<option value="3">留言</option>
</select>
<input type="text" name="word" size="20" class="input" style="height:19px; ">
<input type="radio" name="sea_cat" value="标题">标题
<input type="radio" name="sea_cat" value="内容">内容
<input type="submit" value="搜" name="B1" class="input1" >
demo3.html
<script type="text/javascript">
function beforeSubmit(form){
if(form.username.value==''){
alert('用户名不能为空！');
form.username.focus();
return false;
}
if(form.password.value==''){
alert('密码不能为空！');
form.password.focus();
return false;
}
if(form.password.value.length<6){
alert('密码至少为6位，请重新输入！');
form.password.focus();
return false;
}
if(form.password.value!=form.password2.value) {
alert('你两次输入的密码不一致，请重新输入！');
form.password2.focus();
return false;
}
return true;
}
</script>
<fieldset>
<legend>用户注册</legend>
<form method="post" name="form" action="user.do?method=register" onSubmit="return beforeSubmit(this);">
<table border="1" width="100%" cellspacing="0" cellpadding="0">
<tr><td><label>用户名：<input type="text" name="username" value=""></label></td></tr>
<tr><td><label>密 码：<input type="password" name="password" value=""></label></td></tr>
<tr><td><label>重复密码：<input type="password" name="password2" value=""></label></td></tr>
<tr><td><input value="注册" type="submit"> <input type="reset" value="重置"></td></tr>
</table>
</form>
</fieldset>