JavaScript表单信息验证案例——使用正则

Posted 流楚丶格念

tags:

篇首语：本文由小常识网(cha138.com)小编为大家整理，主要介绍了JavaScript表单信息验证案例——使用正则相关的知识，希望对你有一定的参考价值。

文章目录

展示

在这里插入图片描述

设计

首先建立我们的输入框

QQ号：<input type="text" id="txtQQ"><span></span><br>
邮箱：<input type="text" id="txtEMail"><span></span><br>
手机：<input type="text" id="txtPhone"><span></span><br>
生日：<input type="text" id="txtBirthday"><span></span><br>
姓名：<input type="text" id="txtName"><span></span><br>

建好之后就可以进行对输入的数据进行获取判断了

例如用document.getElementById("txtQQ")获取文本框，在设计一个函数进行判断

//获取文本框
var txtQQ = document.getElementById("txtQQ");
var txtEMail = document.getElementById("txtEMail");
var txtPhone = document.getElementById("txtPhone");
var txtBirthday = document.getElementById("txtBirthday");
var txtName = document.getElementById("txtName");

// qq
txtQQ.onblur = function () {
  //获取当前文本框对应的span
  var span = this.nextElementSibling;
  var reg = /^\\d{5,12}$/;
  //判断验证是否成功
  if(!reg.test(this.value) ){
    //验证不成功
    span.innerText = "请输入正确的QQ号";
    span.style.color = "red";
  }else{
    //验证成功
    span.innerText = "";
    span.style.color = "";
  }
};

//txtEMail
txtEMail.onblur = function () {
  //获取当前文本框对应的span
  var span = this.nextElementSibling;
  var reg = /^\\w+@\\w+\\.\\w+(\\.\\w+)?$/;
  //判断验证是否成功
  if(!reg.test(this.value) ){
    //验证不成功
    span.innerText = "请输入正确的EMail地址";
    span.style.color = "red";
  }else{
    //验证成功
    span.innerText = "";
    span.style.color = "";
  }
};
/*

省略验证手机等方法

*/

但是这样写会造成代码冗余，我们可以将表单验证部分封装成一个功能函数，例如：

var regBirthday = /^\\d{4}-\\d{1,2}-\\d{1,2}$/;
addCheck(txtBirthday, regBirthday, "请输入正确的出生日期");
//给文本框添加验证
function addCheck(element, reg, tip) {
  element.onblur = function () {
    //获取当前文本框对应的span
    var span = this.nextElementSibling;
    //判断验证是否成功
    if(!reg.test(this.value) ){
      //验证不成功
      span.innerText = tip;
      span.style.color = "red";
    }else{
      //验证成功
      span.innerText = "";
      span.style.color = "";
    }
  };
}

通过给元素增加自定义验证属性对表单进行验证：

<form id="frm">
  QQ号：<input type="text" name="txtQQ" data-rule="qq"><span></span><br>
  邮箱：<input type="text" name="txtEMail" data-rule="email"><span></span><br>
  手机：<input type="text" name="txtPhone" data-rule="phone"><span></span><br>
  生日：<input type="text" name="txtBirthday" data-rule="date"><span></span><br>
  姓名：<input type="text" name="txtName" data-rule="cn"><span></span><br>
</form>

// 所有的验证规则
var rules = [
  {
    name: 'qq',
    reg: /^\\d{5,12}$/,
    tip: "请输入正确的QQ"
  },
  {
    name: 'email',
    reg: /^\\w+@\\w+\\.\\w+(\\.\\w+)?$/,
    tip: "请输入正确的邮箱地址"
  },
  {
    name: 'phone',
    reg: /^\\d{11}$/,
    tip: "请输入正确的手机号码"
  },
  {
    name: 'date',
    reg: /^\\d{4}-\\d{1,2}-\\d{1,2}$/,
    tip: "请输入正确的出生日期"
  },
  {
    name: 'cn',
    reg: /^[\\u4e00-\\u9fa5]{2,4}$/,
    tip: "请输入正确的姓名"
  }];

addCheck('frm');


//给文本框添加验证
function addCheck(formId) {
  var i = 0,
      len = 0,
      frm =document.getElementById(formId);
  len = frm.children.length;
  for (; i < len; i++) {
    var element = frm.children[i];
    // 表单元素中有name属性的元素添加验证
    if (element.name) {
      element.onblur = function () {
        // 使用dataset获取data-自定义属性的值
        var ruleName = this.dataset.rule;
        var rule =getRuleByRuleName(rules, ruleName);

        var span = this.nextElementSibling;
        //判断验证是否成功
        if(!rule.reg.test(this.value) ){
          //验证不成功
          span.innerText = rule.tip;
          span.style.color = "red";
        }else{
          //验证成功
          span.innerText = "";
          span.style.color = "";
        }
      }
    }
  }
}

// 根据规则的名称获取规则对象
function getRuleByRuleName(rules, ruleName) {
  var i = 0,
      len = rules.length;
  var rule = null;
  for (; i < len; i++) {
    if (rules[i].name == ruleName) {
      rule = rules[i];
      break;
    }
  }
  return rule;
}

完整代码

简约版

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <title>title</title>
  <style>
    .fei {
      position: absolute;
      top: 100px;
      left: 100px;
    }
  </style>
</head>

<body>
  <form class="fei" id="frm">
    QQ号：<input type="text" name="txtQQ" data-rule="qq"><span></span><br>
    邮箱：<input type="text" name="txtEMail" data-rule="email"><span></span><br>
    手机：<input type="text" name="txtPhone" data-rule="phone"><span></span><br>
    生日：<input type="text" name="txtBirthday" data-rule="date"><span></span><br>
    姓名：<input type="text" name="txtName" data-rule="cn"><span></span><br>
  </form>
  <script>
    // 所有的验证规则
    var rules = [
      {
        name: 'qq',
        reg: /^\\d{5,12}$/,
        tip: "请输入正确的QQ"
      },
      {
        name: 'email',
        reg: /^\\w+@\\w+\\.\\w+(\\.\\w+)?$/,
        tip: "请输入正确的邮箱地址"
      },
      {
        name: 'phone',
        reg: /^\\d{11}$/,
        tip: "请输入正确的手机号码"
      },
      {
        name: 'date',
        reg: /^\\d{4}-\\d{1,2}-\\d{1,2}$/,
        tip: "请输入正确的出生日期"
      },
      {
        name: 'cn',
        reg: /^[\\u4e00-\\u9fa5]{2,4}$/,
        tip: "请输入正确的姓名"
      }];

    addCheck('frm');


    //给文本框添加验证
    function addCheck(formId) {
      var i = 0,
        len = 0,
        frm = document.getElementById(formId);
      len = frm.children.length;
      for (; i < len; i++) {
        var element = frm.children[i];
        // 表单元素中有name属性的元素添加验证
        if (element.name) {
          element.onblur = function () {
            // 使用dataset获取data-自定义属性的值
            var ruleName = this.dataset.rule;
            var rule = getRuleByRuleName(rules, ruleName);

            var span = this.nextElementSibling;
            //判断验证是否成功
            if (!rule.reg.test(this.value)) {
              //验证不成功
              span.innerText = rule.tip;
              span.style.color = "red";
            } else {
              //验证成功
              span.innerText = "";
              span.style.color = "";
            }
          }
        }
      }
    }

    // 根据规则的名称获取规则对象
    function getRuleByRuleName(rules, ruleName) {
      var i = 0,
        len = rules.length;
      var rule = null;
      for (; i < len; i++) {
        if (rules[i].name == ruleName) {
          rule = rules[i];
          break;
        }
      }
      return rule;
    }
  </script>
</body>

</html>

豪华版

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <title>Document</title>
  <style type="text/css">
    body {
      background: #ccc;
    }

    label {
      width: 40px;
      display: inline-block;
    }

    span {
      color: red;
    }

    .container {
      margin: 100px auto;
      width: 400px;
      padding: 50px;
      line-height: 40px;
      border: 1px solid #999;
      background: #efefef;
    }

    span {
      margin-left: 30px;
      font-size: 12px;
    }

    .wrong {
      color: red
    }

    .right {
      color: green;
    }

    .defau {
      width: 200px;
      height: 20px;
    }

    .de1 {
      background-position: 0 -20px;
    }
  </style>

</head>

<body>
  <div class="container" id="dv">
    <label for="qq">Q Q</label><input type="text" id="qq"><span></span><br />
    <label>手机</label><input type="text" id="phone"><span></span><br />
    <label>邮箱</label><input type="text" id="e-mail">JavaScript 中使用正则表达式


 javascript:正则表达式一个表单验证的例子


 JavaScript ---[表单验证,正则表达式]


 我在php表单有选择时间的select 我想用javascript验证 闰年、大月、小月的问题，下面是我的javascript 代


 JavaScript表单验证和正则表达式


 JavaScript 笔记 -- 类型转换 & 正则表达 & 变量提升 & 表单验证