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JavaScript简单验证表单空值及邮箱格式的方法

2019-11-19 17:51:21
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本文实例讲述了JavaScript简单验证表单空值及邮箱格式的方法。分享给大家供大家参考,具体如下:

运行效果图如下:

具体代码如下:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN""http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><meta http-equiv="Content-Language" content="zh-cn" /><title>Javascript 表单验证</title><body> <h3>(一)验证必填项是否有空值。</h3> <form action = "submitpage.html" onsubmit = "return validate_form(this)" method = "post"> Name:<input type = "text" name = "name" size = "20"> <input type = "submit" value = "Submit"> </form> <h3>(二)验证Email格式是否正确。</h3> <form action = "submitpage.html" onsubmit = "return is_email_form(this)" method = "post"> Email:<input type = "text" name = "email" size = "20"> <input type = "submit" value = "OK"> </form> <script>//判断内容是否为空 function validate_form(thisform){  with (thisform){   if (!validate_required(name,"Name must be filled out!")){    name.focus();    return false   }  } } function validate_required(field,alerttxt){   with (field){    if (value==null||value==""){     alert(alerttxt);     return false    }else {     return true    }   }  }//判断内容是否符合email的格式function is_email_form(thisform){ with(thisform){  if(!checkEmail(email,"Not a valid e-mail address!")){   email.focus();   return false;  } }}function checkEmail(field, alertText){ with(field){  apos = value.indexOf("@");  dotPos = value.indexOf(".");  if(apos<1 || dotPos-apos<2){   alert(alertText);   return false;  }else{   return true;  } }} </script></body></html>

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希望本文所述对大家JavaScript程序设计有所帮助。

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