案例一：
<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>
案例二：
<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" >
