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JavaScript表单验证

2024-10-10 10:06:02   219人阅读

 <!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>无标题文档</title>
 </head>
  
  <body>
 <form action="../0620/lunbo.html" method="post">
 <div>
     <div>
         <div>
             请输入用户名：
          </div>
         <div>
             <input type="text" name="uid" id="uid" onblur="yanzheng()"/>
             <span id="tishi"></span>
         </div>
     </div>
    <div>
         <div>
                请输入密码：
           </div>
         <div>
             <input type="password" name="uid1" id="uid1" />
         </div>
     </div>
     <div>
         <div>
             请再次输入密码：
          </div>
         <div>
            <input type="password" name="uid2" id="uid2" onblur="xiangdeng()"/>
             <span id="tish2"></span>
         </div>
     </div>
    <div>
         <div>
             请输入年龄：
           </div>
         <div>
             <input type="text" name="age" id="age" onblur="nage()"/>
             <span id="tish3"></span>
         </div>
     </div>
     <div>
        <div>
             请输入手机号：
           </div>
         <div>
             <input type="text" name="tel" id="tel" onblur="tell()"/>
             <span id="tish4"></span>
         </div>
     </div>
 
     <div>
        <div>
             <!--双引号里可以直接写js代码，所以可以用return-->
             <input type="submit" value="http://www.mamicode.com/提交" onclick="return check()"/>
         </div>
     </div>
 </div>
 </form>
 </body>
 </html>
 <script>
       //先执行点击事件，在执行提交
     function check(){
         //判断如果没有输入即用户名为空，提示用户名为空并返回false，如果不为空返回true
         if(document.getElementById("uid").valuehttp://www.mamicode.com/==""){
            alert("用户名不能为空！");
            return false;
         }else{
             return true;
         }
     }
     
     function yanzheng(){
         //非空验证
         if(document.getElementById("uid").valuehttp://www.mamicode.com/==""){
             //给后面的span添加文本并改变文本颜色
             document.getElementById("tishi").innerText="用户名不能为空";
             document.getElementById("tishi").style.color="red";
         }else{
             document.getElementById("tishi").innerText="用户名可用";
             document.getElementById("tishi").style.color="green";
         }
     }
     function xiangdeng(){
        var p1=document.getElementById(‘uid1‘);
         var p2=document.getElementById(‘uid2‘);
         //相等验证
         if(p1.value=http://www.mamicode.com/=p2.value){"tish2").innerText="输入正确";
            document.getElementById("tish2").style.color="green";
         }else{
             document.getElementById("tish2").innerText="两次输入密码不一致";
             document.getElementById("tish2").style.color="red";
         }
     }
     function nage(){
         var a = document.getElementById("age");
         //范围验证
         //获取用户输入的值并用parseInt转换为整数进行比较
         if(parseInt(a.value)>=18 && parseInt(a.value)<=50){
             document.getElementById("tish3").innerText="输入正确";
             document.getElementById("tish3").style.color="green";
         }else{
             document.getElementById("tish3").innerText="年龄不符合条件";
             document.getElementById("tish3").style.color="red";
         }
     }
    function tell(){
         var a = document.getElementById("tel");
         //正则验证
         if(a.value.match(/^1[3|4|5|7|8][0-9]{9}$/)==null){  
             document.getElementById("tish4").innerText="手机号不合法";
            document.getElementById("tish4").style.color="red";            
            
         }else{
             document.getElementById("tish4").innerText="输入正确";
            document.getElementById("tish4").style.color="green";
        }
     }

 </script>

JavaScript表单验证


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