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Validate login page input using regular expressions

巴扎黑Original: 2017-09-21 11:26:362125browse

This article mainly introduces the example code that uses regular expressions to verify whether the input on the login page meets the requirements. It is very good and has reference value. Friends who need it can refer to it.

Let me show you the effect first. Picture:

Without further ado, I will post the code directly for you. The specific code is as follows:

<!DOCTYPE html>
<html>
 <head>
 <meta charset="UTF-8">
 <title></title>
 </head>
 <script src="js/jquery-1.8.0.min.js"></script>
 <script>
 $(function() {
  $("input[name=&#39;uname&#39;]").blur(function() { //失去焦点
  var namestr = $(this).val();
  var regstr = /^[\u4e00-\u9fa5]{2,4}$/;
  if(!regstr.test(namestr)) {
   $(this).parent().next().html("用户名必须是2-4个汉字").css("color", "red");
   return false;
  }
  return true;
  }); 
  $("input[name = &#39;uname&#39;]").focus(function() { //获取焦点
  $(this).val("");
  $(this).parent().next().html("");
  });
  $("input[name=&#39;pwd&#39;]").blur(function() {
  var pwdstr = $(this).val();
  var regstr = /^\w{6}$/;
  if(!regstr.test(pwdstr)) {
   $(this).parent().next().html("密码必须是6位数字字母下划线").css("color", "red");
   return false;
  }
  return true;
  });
  $("input[name=&#39;pwd&#39;]").focus(function() {
  $(this).parent().next().html("");
  });
  $("input[name=&#39;birthday&#39;]").blur(function() {
  var birthdaystr = $(this).val();
  var regstr = /^(19|20)\d{2}-(1[0-2]|0?[1-9])-(3[0-1]|2[0-9]|0?[1-9])$/;
  if(!regstr.test(birthdaystr)) {
   $(this).parent().next().html("日期格式不正确").css("color", "red");
   return false;
  }
  return true;
  });
  $("input[name=&#39;birthday&#39;]").focus(function() {
  $(this).parent().next().html("");
  });
  $("input[name=&#39;email&#39;]").blur(function(){
  var emailstr = $(this).val();
  var regstr = /^[\w\-]+@[a-z0-9A-Z]+(\.[a-zA-Z]{2,3}){1,2}$/;
  if(!regstr.test(emailstr)){
   $(this).parent().next().html("邮箱格式不正确").css("color","red");
   return false;
  }
  return true;
  });
  $("input[name=&#39;email&#39;]").focus(function(){
  $(this).parent().next().html("");
  });
 });
 </script>
 <style>
 body {
  font-size: 12px;
 }
 #home {
  background-color: beige;
  border: solid 1px black;
  width: 550px;
  height: 185px;
  margin: auto;
  margin-top: 20px;
 }
 #head {
  height: 135px;
 }
 #foot {
  text-align: center;
 }
 .dl1 {
  clear: both;
  padding-left: 10px;
 }
 .dl1 dt {
  float: left;
  height: 30px;
  width: 80px;
  line-height: 30px;
 }
 .dl1 dd {
  float: left;
  height: 30px;
  line-height: 30px;
  /*width: 250px;*/
 }
 #btn_res {
  background-image: url(img/reset.gif);
  width: 80px;
  height: 34px;
 }
 #btn_sub {
  background-image: url(img/submit.gif);
  width: 80px;
  height: 34px;
 }
 </style>
 <body>
 <p id="home">
  <p id="head">
  <form action="" method="post">
   <dl class="dl1">
   <dt>用户名 : </dt>
   <dd class="dd1"><input type="text" value="输入用户名" name="uname" /></dd>
   <dd></dd>
   </dl>
   <dl class="dl1">
   <dt>用户密码 : </dt>
   <dd class="dd1"><input type="password" name="pwd" /></dd>
   <dd></dd>
   </dl>
   <dl class="dl1">
   <dt>出生日期 : </dt>
   <dd class="dd1"><input type="text" name="birthday" /></dd>
   <dd>yyyy-mm-dd</dd>
   </dl>
   <dl class="dl1">
   <dt>用户邮箱 : </dt>
   <dd><input type="text" name="email"/></dd>
   <dd></dd>
   </dl>
  </form>
  </p>
  <p id="foot">
  <input type="submit" value="" id="btn_sub" />
  <input type="reset" value="" id="btn_res" />
  </p>
 </p>
 </body>
</html>

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