JS实现的简单表单验证功能完整实例

2019-11-19 15:10:20

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来源：转载

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本文实例讲述了JS实现的简单表单验证功能。分享给大家供大家参考，具体如下：

<!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=utf-8" /><title>www.VeVB.COm 表单验证</title><style type="text/css"><!--body,td,th {  font-size: 12px;  color: #000000;}body {  background-color: #CCCCCC;  margin-left: 0px;  margin-top: 0px;}a {  font-size: 12px;  color: #666600;}a:link {  text-decoration: none;}a:visited {  text-decoration: none;  color: #000099;}a:hover {  text-decoration: underline;  color: #6633FF;}a:active {  text-decoration: none;  color: #00FF00;}--></style>  <script type="text/javascript">    function checkusername()    {      var myform = document.getElementById("form1");      var username = myform.username.value.length;      if(username < 1||username>12)      {        errusername.innerHTML = "<font color='red'>用户名不符合要求</font>";        return false;      }else{        errusername.innerHTML = "<font color='green'>用户名符合要求</font>";        return true;      }    }    function checkage()    {      var myform = document.getElementById("form1");      var age = myform.age.value;      if(age != parseInt(age))      {        errage.innerHTML = "<font color='red'>年龄不符合要求</font>";        return false;      }else{        errage.innerHTML = "<font color='green'>年龄符合要求</font>";        return true;      }    }    function checkemail()    {      var myform = document.getElementById("form1");      var mail=/^[A-Za-z0-9_-]+@[a-zA-Z0-9_-]+(/.[a-zA-Z0-9_-]+)+$/;      if(!mail.test(myform.email.value))      {          erremail.innerHTML = "<font color='red'>email不符合要求</font>";        return false;      }else{        erremail.innerHTML = "<font color='green'>email符合要求</font>";        return true;      }    }    function checkform()    {      checkusername();checkage();checkemail();      if(checkusername()&&checkage()&&checkemail())      {        return true;        }else{        return false;      }    }  </script></head><body alink="center"> <form id="form1" name="form1" method="post" action="ttt.jsp" onsubmit="return checkform()"><table width="777" border="0" cellpadding="1" cellspacing="1"> <tr>  <td colspan="3" ><div align="center">请输入你的注册信息</div></td> </tr> <tr>  <td width="250" ><div align="right" >请输入你的用户名：</div></td>  <td width="250"><div align="center">     <input type="text" name="username" onblur="checkusername()" />     </div></td>  <td><div id="errusername" align="center"></div></td> </tr> <tr>  <td width="250"><div align="right">请输入你的年龄：</div></td>  <td width="250"><div align="center" >   <label>   <input type="text" name="age" onblur="checkage()"/>   </label>  </div></td>   <td><div align="center" id="errage"></div></td> </tr> <tr>  <td width="250"><div align="right" >请输入你的EMAIL:</div></td>  <td width="250"><div align="center" >   <label>   <input type="text" name="email" onblur="checkemail()" />   </label>  </div></td>   <td><div align="center" id="erremail"></div></td> </tr> <tr>  <td><div align="right">   <label>   <input type="submit" name="Submit" value="提交" />   </label>  </div></td>   <td><div align="center">    <label>    <input type="reset" name="Submit2" value="重置" />    </label>   </div></td>  <td><div align="center"></div></td> </tr></table> </form></body></html>

运行效果：